Shanghai Huabang Industrial Business Network - High voltage protector

[Overvoltage absorber]GS10-10 type overvoltage absorber

2026-6-14 11:11:06

GS10-10 type overvoltage absorber

[fault indicator]EKL1-2 Four in one overhead fault indicator

2026-6-14 10:59:49

The EKL1-2 series overhead fault indicator is installed on 6-35KV transmission and distribution lines as a device for indicating the flow of fault current. In case of a fault in the line, the patrol personnel can quickly determine the faulty section and locate the fault point by using the red alarm display of the indicator. Greatly improving work efficiency, shortening power outage time, and effectively enhancing the reliability of power supply. Our company relies on the scientific research advantages of Tsinghua University to propose a new fault detection method based on the summary of existing fault detection devices, and has applied for a national invention patent. The fault detection device has a novel detection method, which is not only reliable in action and stable in performance, but also extremely simple and convenient to install and remove.

EKL1-2 four in one overhead fault indicator features:

Fault indication: During normal operation, the window is displayed in white; When a short circuit or grounding fault occurs, the window will display red during the day and light up at night.
Online operation: directly installed on overhead power lines, maintenance free.
Strong anti-interference ability: The signal is not affected by the line, excitation inrush current, high-order harmonics, current fluctuations, especially the distributed capacitance branch of the cable
Automatic reset: After the indicator action flips, it will automatically reset according to the set time.
Live loading and unloading: Live loading and unloading are extremely simple and do not affect the operation of the line.

Applicable routes
Used for 6-35kV overhead bare wires and insulated wires
Specially designed for 6-35KV cable lines

Installation location
The middle section and branch entrance of a long line can indicate the faulty section and branch of the line.
Substation exit: It can be determined whether it is an internal or external fault.
At the high-voltage incoming line of the user distribution transformer: it can be determined whether the fault is caused by the user.
Connection between cable and overhead line: Can distinguish whether the fault is in the cable section.

[fault indicator]EKL2-1 Cable type fault indicator that can be installed with electricity

2026-6-14 10:59:38

The EKL2-1 cable type fault indicator, which can be installed with electricity, is suitable for detecting and indicating cable grounding faults in cable distribution boxes, ring network switchgear, and other equipment. The indicator is embedded with advanced microchips, which have advantages such as intelligence and low power consumption. When a ground fault occurs in the circuit, the indicator detects the short-circuit current and performs arithmetic processing to memorize the fault status, and the red light starts flashing continuously. After the automatic reset time, the red light stops flashing, the indicator automatically resets, and the fault record is cleared.

Technical parameters of EKL2-1 cable type fault indicator for live installation:
Short circuit action current �� 20A (error ± 10%, adjustable according to requirements)
Short circuit response time: 0.02s �� T �� 4S
Working environment range: -40 �� -+85 ��
Working power supply: Equipped with a built-in 2000mAh lithium battery, with a service life of 8-10 years and a voltage of 3V. Automatic reset time: 12 hours (optional, users can confirm at the time of ordering). Easy loading and unloading operation: requires specialized installation tools and can be equipped with a live loading and unloading indicator. Line range: Cable diameter (with outer sheath) �ܦ� 40mm

[Overvoltage absorber]SOWM,SOWF series coupling capacitors for testing

2026-6-14 10:59:17

SOWM, SOWF series coupling capacitors for testing

[Overvoltage absorber]GS6-6,GS6-10 type overvoltage absorber

2026-6-14 10:59:06

GS6-6, GS6-10 type overvoltage absorber

[Overvoltage absorber]LGJ type three-phase dry-type overvoltage absorber

2026-6-14 10:46:14

The LGJ type dry-type overvoltage absorber is a new type of dry-type overvoltage absorber, mainly used in power plants and factory power supply systems to absorb operational overvoltages (including cut-off overvoltage, reignition overvoltage, etc.) generated by the opening and closing of vacuum switches and vacuum contactors, in order to protect the insulation of loads such as motors and transformers from overvoltage damage and maintain the safe and normal operation of electrical equipment.

Service conditions for LGJ type three-phase dry-type overvoltage absorber
1. Indoor use (customized for outdoor use, ceramic sleeve type)
2. Environmental temperature: -40 ��~+40 �� TH type -20 ��~+45 ��
3. The surrounding air humidity should not exceed 90%, and for TH type, it should be 95%
4. The air in the installation site should not contain corrosive gases or dust, and there should be no explosive dust.
5. The altitude should not exceed 3000m. If it exceeds 3000m, please choose G-type.
When the harmonic of the power grid exceeds the provisions of GB/T14549-93, Q-type products should be selected. When placing an order in areas with severe harmonics, it should be explained.

[Overvoltage absorber]LG12-0.2-100-1 Overvoltage Absorber

2026-6-14 10:46:03

LG12-0.2-100-1 Overvoltage Absorber

[fault indicator]DS-300 Intelligent Cable Fault Tester

2026-6-14 10:37:33

The DS-300 intelligent cable fault tester is a cable fault tester specially designed and produced for oilfield logging cables. It is a nationally unique instrument with high sensitivity and stable performance.

Technical indicators
Single end testing distance: within 8km
Relative error: ��± 2%
Working environment temperature: -20 ��~+50 ��
Test blind spot: �� 15m
Fixed point error: �� 1m

[fault indicator]DS-200 Cable Fault Tester and Management System

2026-6-14 10:37:22

Technical specifications of DS-200 cable fault tester and management system

Input voltage: 220V ± 10% 50Hz
Test blind spot: �� 15m
Fixed point error: �� 1m
Volume: (455 × 300 × 190) mm
Single end testing distance: within 8km
Relative error: ��± 2%
Working environment temperature: -20 ��~+50 ��
Weight: 8kg

[fault indicator]DS-100 Cable Fault Tester

2026-6-14 10:37:11

Introduction to the functions of DS-100 cable fault tester
Can test low resistance, short circuit, high resistance, open circuit and other faults of various power cables below 35KV.
Can test and calibrate cable length.
Can test the propagation speed of radio waves in cables.
Can accurately locate the location of cable burial.
Cooperating with high-voltage equipment can accurately locate the fault point.

characteristic
The DS-100 cable fault tester model integrates distance measurement, path finding, and positioning, and is equipped with a micro printer that can be printed on site for easy operation
Make and carry. Adopting LCD display. Human computer dialogue, experts suggest using a dual vertical light cursor for operation, therefore
Automatic display of obstacle distance. The test results can be stored and printed. Memory test wiring diagram and standard waveform.

Technical specifications of DS-100 cable fault tester
Input voltage: 220V ± 10% 50Hz
Test blind spot: �� 15m
Fixed point error: 0.5m
Volume: (455 × 315 × 195) mm
Single end testing distance: within 8km
Relative error: ��± 2%
Working environment temperature: -20 ��~+50 ��
Weight: 9kg

[fault indicator]DS-3PY Line Fault Online Intelligent Monitoring System

2026-6-14 10:37:08

DS-3PY Line Fault Online Intelligent Monitoring System

In the 6-35kV neutral point ungrounded operation system, there are many branches of the line, multiple operation modes, low reliability of power supply, time-consuming and laborious fault inquiry, and a large workload of maintaining the line. In addition, the detection of single-phase grounding faults has always been a difficult problem for the power system. Theft and cutting of electrical wires are also common occurrences. The DS-3PY line fault online intelligent monitoring system is a line fault alarm and monitoring system applied to the power supply system. It can monitor the operation of the line in real time, and automatically send information to maintenance personnel in case of short circuit faults, grounding faults, power outages, or power transmission situations. The fault location is displayed on the computer.

Target function
Short circuit faults, single-phase grounding faults, power outages, power transmission, phase loss, overcurrent, etc. can also fundamentally require additional functions

Disadvantages of traditional products
1. The low current grounding line selection device can only detect the grounding fault of a certain outgoing line first, and due to various reasons, its reliability is not high.
2. Various fault indicator display methods are not suitable for searching, and maintenance personnel need to go out along the line to see if the fault indicator is displaying.

Advantages of DS-3PY Line Fault Online Intelligent Monitoring System
1. Not only can it indicate which outgoing line is faulty, but it can also display which branch segment is faulty.
2. You don't need to go out to search anymore, you can see the location of the fault point on the computer.
3. You can also send the fault point to the on duty personnel's mobile phone.
4. The remote transmission system is not limited by distance.

DS-3PY Line Fault Online Intelligent Monitoring System

[fault indicator]MI6IS type electromagnetic fault indicator

2026-6-14 10:06:35

The MI6IS electromagnetic fault indicator has a small size, light weight, compact structure, easy operation, high sensitivity, and can be widely used for fault indication in aviation, electronics, and other fields

Specification: 28VDC
Size: 51.3mm × 18.5mm × 20mm
Weight: �� 36g

[fault indicator]Z1-SE Short circuit grounding 2 Combined with 1 fault indicator

2026-6-14 9:53:14

Z1-SE Short Circuit Grounding 2-in-1 Fault Indicator Product Function and Features

Display mode: daytime flip card display, night vision reflection within 360 º �� range can be observed.
Identifying faults has the function of identifying ground short circuit faults, and can distinguish between permanent faults and transient faults.
Fault diagnosis can only be given in the event of a ground short circuit fault, sudden change in current, and after the switch trips, without the need to set action values.
When suppressing the surge current during power transmission, the indicator detects the excitation current and locks the circuit to prevent the fault indicator from malfunctioning.
Online operation is directly installed on power lines (overhead lines or busbars) and can operate outdoors for a long time without maintenance.
Special tools for live loading and unloading applications can be installed and removed with electricity, and there will be no false alarms during the loading and unloading process.
The night vision reflective display board adopts night vision reflective technology for easy observation at night.
Rust resistant and corrosion-resistant structural components are made of rust resistant and corrosion-resistant materials

2�� Schematic diagram of grounding short circuit of overhead line
Short circuit detection: As shown in the figure, when a short circuit fault occurs in the circuit, the short circuit fault indicator senses the fault current, and the display window of the indicator will change from white to red (or from no light to light). Based on the fact that the B-phase indicators 2, 5, 8 on Line 2 and the C-phase indicators 3, 6, and 9 on Line 3 have flipped over (or lit up), while the indicators 11 and 12 have not flipped over (or lit up), it can be quickly determined that the fault is at point D.

Grounding detection principle: Grounding detection principle: Sample the first half wave of the capacitance current at the moment of grounding and the first half wave of the voltage at the moment of grounding, compare their phases. When the capacitance current at the moment of sampling grounding suddenly changes and exceeds a certain value, and is in phase with the first half wave of the voltage at the moment of grounding, and the wire to ground voltage decreases at the same time, it is judged that the line has been grounded. Otherwise, the line has not been grounded. As shown in the figure, if the indicators 3, 6, and 9 of phase C on line 2 flip over and the indicator 12 still does not move, it can be determined that a grounding fault has occurred at point D.

3�� Z1-SE short-circuit grounding 2-in-1 fault indicator action criterion
(1) It �� 160A. It is the starting value of the sudden variable current
(2) �� I �� 0.5I0 �� I is the current change rate I0 is the line current before the short circuit
(3) I=0, I is the current after the line fault
(4) 0.06S �� T �� 3S �� T is the sudden change time of current

4�� Z1-SE Short Circuit Grounding 2-in-1 Fault Indicator Technical Parameters
Applicable voltage: 6-35kV, parameters may vary for different voltage levels
Load current 0-1200A
Applicable wire outer diameter 25 mm2-400 mm2
The default factory setting for fault reset time is 12h and 24h (can also be adjusted according to user requirements)
Applicable ambient temperature -35 ��~75 ��
Capable of performing actions �� 5000 times
Weight �� 500g
Battery life>10 years
Device service life>10 years
Wind resistance capacity: wind speed of 150km/h, cannot be loosened

5�� Loading and unloading of Z1-SE short-circuit grounding 2-in-1 fault indicator
For short-circuit fault indicators installed on overhead lines, specialized installation tools can be used for live installation and disassembly. Installation instructions for Z1-SEII overhead short-circuit grounding four in one fault indicator.

[fault indicator]SEK-F type panel fault indicator

2026-6-13 21:21:38

1�� Product Introduction
The SEK-F panel fault indicator is a real-time monitoring device installed on the ring network switch, cable branch box, and box transformer in the distribution network system, used to indicate short circuits and single-phase grounding faults in corresponding cable sections. When a fault occurs in the line, the staff can use the alarm indication of the indicator to quickly determine the faulty section and locate the fault point. At the same time, the alarm information can be sent in real time to the server in the monitoring center, and the area and specific location of the fault can be displayed on the screen of the monitoring computer, guiding the line patrol personnel to quickly determine the fault section and find the fault point. This indicator provides the best way to solve the problem of fault finding. It is of great significance to improve work efficiency, shorten power outage time, quickly restore power supply, enhance power supply reliability and economic benefits.

2�� The panel type fault detection device consists of two parts:
A�� Host B, short circuit (grounding) sensor

3�� Main functions of SEK-F panel fault indicator
1. Short circuit alarm indication: The short circuit sensor detects the current of the circuit during operation. When a short circuit fault occurs in the circuit and the fault current reaches or exceeds the alarm current setting value, the short circuit sensor sends an alarm signal, which is transmitted to the host through optical fiber. After the host receives this signal, it generates a corresponding alarm indication signal.
2. Grounding alarm indication: The grounding sensor detects the zero sequence current of the line during operation. When a grounding fault occurs in the line and the grounding fault current reaches or exceeds the alarm current setting value, the grounding sensor sends an alarm signal, which is transmitted to the host through optical fiber. After the host receives this signal, it generates a corresponding alarm indication signal.
3. Automatic reset: When the indicator sends an alarm signal, if there is no manual reset, the indicator will automatically reset within the set reset time.
4. Manual reset: When the indicator generates an alarm, it can be reset by triggering the "Reset/Test" button on the indicator host panel to release the alarm.
5. Testing: The indicator can perform self inspection of its working performance. Test by pressing and holding the "Reset/Test" button on the host panel for 1.5 seconds.

4�� Installation steps for SEK-F panel fault indicator:
1. The host of the indicator is installed on the front panel of the distribution cabinet;
2. Installation of short-circuit sensors;
The short-circuit sensor must be installed on the single-phase branch of the cable, and can be directly installed on the tested cable and fastened to prevent sliding and detachment.
3. Installation of grounding sensor:
When installing the grounding sensor, attention should be paid to surrounding the three wires of the cable. The grounding wire of the cable must be threaded back through the sensor and fastened to prevent sliding and detachment.
4. Connection:
The sensor and the host are connected by fiber optic cables. During installation, the two ends of the fiber optic cable are inserted into the fiber optic connectors of the sensor and the host respectively, and the connectors are tightened to prevent the fiber optic cable from being pulled out. The specific steps are as follows:
4.1. Insert the other end of the A-phase short-circuit sensor fiber optic cable into the corresponding fiber hole A on the rear panel of the host;
4.2. Insert the other end of the B-phase short-circuit sensor fiber optic cable into the corresponding fiber hole on the back panel of the host;
4.3. Insert the other end of the C-phase short-circuit sensor fiber optic cable into the corresponding fiber hole on the rear panel of the host;
4.4. During installation, insert the other end of the grounding sensor fiber optic cable into the corresponding fiber optic hole D on the rear panel of the host
5�� Host size: length x width x height: 96 x 49 x 85mm
Host installation opening size: Length: 91 ± 0.5mm Width: 43 ± 0.5mm
6�� Operation:
1. Test: When a self-test is required, press the "Reset/Test" button on the panel and hold it for 1.5 seconds. The machine will enter self-test mode and all items on the panel will be checked
The indicator light flashes, indicating that the whole machine is working normally. The entire process will automatically end after 7 seconds, or pressing the "Reset/Test" button again can end the self-test process and restore normal status.
2. Clear alarm: When a fault occurs in the circuit, the indicator generates an alarm signal. After the fault is resolved, the alarm should be cleared. The alarm can be released by triggering the "Reset/Test" button on the indicator host panel. If there is no manual reset, the indicator can automatically reset after the set time (6, 12, 24, 48 hours).
7�� Set reset time:
There are four types of indicator alarm status clearing time: 6h, 12h, 24h, 48h. When adjusting the reset time, the front panel of the host needs to be turned on, and the dip switch needs to be adjusted. When the first position of the switch is set to NO and the other three groups are set to OFF, the reset time is 6 hours, and so on. The factory setting value is 12 hours.

8�� Technical parameters
1. Short circuit current alarm: �� 150A with an error of ± 10%; The factory setting is 800A, with a short circuit delay of 60mS
2. Grounding current alarm: 3A~200A error ± 10%, factory set to 10A, grounding delay 40mS
3. Working power supply: ER14505 3.6V lithium battery (with a service life of not less than 5 years)
4. Standby current of the whole machine: �� 5 �� A
5. Automatic reset time: can be set as needed
6. Indicator protection level: host IP40; Sensor IP65
7. Maximum withstand current of short-circuit current sensor: 20KA 4S
8. Working environment: -35 �� to+65 ��; Relative temperature: �� 95%; Waterproof, acid resistant, salt spray resistant
9. Scope of use: In systems below 20kV level

[fault indicator]EKL2 cable fault indicator

2026-6-13 21:21:30

Product Introduction:
The EKL2 cable fault indicator is a device installed in box transformers, cable branch boxes, and ring main units to indicate cable fault branches. A device used to indicate the flow of fault current. Once a short circuit fault occurs in the circuit, the line patrol personnel can use the flashing alarm display on the indicator to quickly determine the fault section, branch, and fault point. Completely changing the outdated practice of blind line inspection, segmented closing and trial power transmission to find faults in the past, greatly improving work efficiency, effectively shortening power outage time, and enhancing power supply reliability and economic benefits.

1�� Cable line short circuit fault indicator
Short circuit fault criterion
(1) 1t �� 600A, 1t is the starting value of sudden variable current
(2) �� 1 �� 0.510 �� 1 current change rate 10 is the line current before the short circuit
(2) 1=0 1 is the current after a line fault
(4) 0.02S �� T �� 2S �� T is the sudden change time of current

2�� Cable line grounding fault indicator
Short circuit fault criterion
When detecting faults, the zero sequence current changes by more than 20A

3�� Cable line grounding short circuit fault indicator
Cable line grounding short circuit fault indicator, each set comes standard with two short circuit indicators and one ground indicator. The short circuit indicator detects short circuit faults, while the ground indicator detects ground faults. When used together, the two can detect both ground and short circuit faults.

4�� Technical parameters of EKL2 cable fault indicator
Short circuit action current �� 20A (error ± 10 �G, adjustable according to demand)
Short circuit response time: 0.02s �� T �� 4S
Working environment range: -40 �� -+85 ��
Working power supply: Equipped with a built-in 2000mAh lithium battery, with a lifespan of 8-10 years and a voltage of 2V
Automatic reset time: 12 hours (optional, users can confirm at the time of ordering)
Easy loading and unloading process: requires specialized installation tools with live loading and unloading indicators.
Line range: Cable diameter (with outer sheath) �� 40mm

[Overvoltage absorber]GE-ZCB type transformer neutral point gap protection device

2026-6-13 21:15:32

The GE-ZCB type transformer neutral point gap protection device is a complete set of equipment that combines electrical equipment such as isolation switches, zinc oxide lightning arresters, discharge gaps, and current transformers. It has the characteristics of full functionality, small size, high reliability, and easy installation and commissioning. Lightning arresters and isolating switches can be combined and selected according to engineering needs. The operating mechanism of the isolation switch can be selected to use manual or electric mechanism according to engineering requirements.

The GE-ZJB type neutral point gap protection device can achieve two different operating modes of transformer neutral point grounding operation or ungrounded operation. In order to avoid damage to the transformer caused by the increase of neutral point voltage due to system failure. This product is widely used in fields such as power, metallurgy, petrochemicals, mining, and building environmental protection.
Features:
1. The GE-ZJB type neutral point gap protection device is equipped with electrical equipment such as discharge gaps and current transformers, and has the characteristics of small size, easy installation and debugging, and high reliability.
2. The GE-ZJB type neutral point gap protection device adopts a spherical discharge gap method, which has higher accuracy, less dispersion, and stable characteristics than the commonly used rod discharge gap discharge voltage. It has precise and effective connection with the lightning arrester characteristics and the main transformer, large heat capacity, and is not suitable for burning, improving the safety and effectiveness of protection.
3. The GE-ZJB type neutral point grounding gap complete set device can adopt spherical gap or rod-shaped gap. The technical parameters of the gap can be debugged in the factory or on-site.

GE-ZJB(1)

GE-ZCB type transformer neutral point gap protection device

[Harmonic eliminator]LXQ II series harmonic elimination resistor

2026-6-13 21:13:44

The LXQ II series harmonic eliminator resistor (hereinafter referred to as the harmonic eliminator) is a nonlinear harmonic damping device installed between the neutral point Y0 of the primary winding of a 6-35kV voltage transformer (hereinafter referred to as the PT) and the ground. It plays a role in current limiting and damping, and can effectively suppress inrush current and PT ferromagnetic resonance. When the neutral point of the power grid where the 6-35kV substation is located is not grounded, the PT primary winding on the busbar will become the only metal channel for the neutral point ungrounded power grid to ground. The charging and discharging of the relative ground capacitance of the power grid will inevitably pass through the PT primary winding, causing deep saturation of its iron core. Therefore, when the grounding of the power grid disappears, a surge of several amperes will appear in the primary winding of the PT. By melting the 0.5A fuse of the PT, the harmonic eliminator can effectively limit the surge of the primary winding of the PT.

When the busbar is unloaded or there are few outgoing lines, ferromagnetic resonance overvoltage may occur, resulting in unstable phase voltage, ground indication misoperation, PT high-voltage fuse melting, and other phenomena. Choosing LXQII series anti harmonic resistors will greatly reduce the occurrence of this situation.

Preface number	project		technical indicators
			LXQII10 (6) type	LXQ (D) II10 (6) type	LXQ (D) Type II	LXQ (D) II35 type
one	The resistor passes through AC0.3mA (voltage and resistance at peak current)	U0.3mA (V. peak/�� 2)	one hundred and thirty ±30	one hundred and thirty ±30	four hundred and fifty ±50	four hundred and fifty ±50
two	The resistor passes through AC3mA (voltage and resistance at peak current)	U3mA (V. peak/�� 2)	five hundred ±100	five hundred ±100	one thousand and four hundred ±150	one thousand and four hundred ±150
		R3mA (k��)	��180	��180	��550	��550
three	Is the power frequency voltage at both ends of the resistor limited to 50H		no restrictions	Limit 3kV peak/�� 2 or below	no restrictions	Limit 5kV peak/�� 2 or below
four	Thermal capacity through 100mA peak current for 2 hours		1. No obvious damage 2. The change in U0.3mA before and after the heat capacity test is ��± 5%
five	Thermal capacity through 500mA peak current for 10 minutes		1. Any obvious damage 2. The change in U0.3mA before and after the heat capacity test is ��± 10%
make use item document	Inside and outside the house, installed near the transformer, the harmonic eliminator has a rainproof function and should not be directly exposed to sunlight and rain
	Environmental temperature -40 ��~60 ��
	The frequency of the AC power system is 50Hz or 60Hz
	Areas with earthquake intensity below 8 degrees

LXQ �� series harmonic elimination resistor

[Overvoltage absorber]JKB-ZR Three phase composite overvoltage protector

2026-6-13 21:12:33

1�� Product Introduction

JKB-ZR three-phase composite overvoltage protector is a new generation of protection device designed to address the weak points of various current overvoltage protectors. The internal of this protector is an organic combination of zinc oxide valve plate and resistance capacitor, which combines the advantages of zinc oxide valve plate type protector and resistance capacitor absorber, and fundamentally overcomes the inevitable disadvantages of pure zinc oxide valve plate type protector and resistance capacitor absorber. It has ideal protection characteristics when system overvoltage occurs and is suitable for the protection of all medium voltage electrical equipment in 35KV and below systems.
1. When there is no overvoltage surge in the system, the protector is in an open circuit state, the capacitor is not connected to the system, and no additional grounding capacitor current is provided to the system, ensuring stable operation of the system.
2. When the amplitude of the system overvoltage is small, the resistance and capacitance work to absorb high-frequency overvoltage, providing true protection for the weak insulation equipment being protected.
3. When the overvoltage amplitude of the system is too large, the zinc oxide valve operates, releasing high amplitude energy to provide safety assurance for the protector and protected equipment under high current impact.
4. This product has a rigorous structure and innovative design. Adopting full integral sealing to ensure insulation, while having a comprehensive testing method, it solves the problem of similar domestic products being unable to be fully sealed due to the inability to conduct integral testing, without affecting surrounding electrical equipment.

2�� Model Description of JKB-ZR Three phase Composite Overvoltage Protector

3�� Product Features
The JKB-ZR three-phase composite overvoltage protector is a combination of resistance capacitance zinc oxide valve plates, which is commonly used for the protection of all inductive load equipment. It is a new generation replacement product for traditional zinc oxide type overvoltage protectors and resistance capacitance absorbers. Retaining the two main functions of traditional protectors:
1. Good response under low current surge (single lightning arrester insulation coordination is only suitable for high current surge), especially suitable for cabinet protection.
2. Provide phase protection (single lightning arrester does not have this function), especially suitable for overvoltage protection during circuit breaker (or switch) opening and closing operations.
3. Using zinc oxide valve plates to limit induced lightning and high amplitude operation overvoltage; Limit high-frequency cutoff and reignition overvoltage with resistance capacitance.
4. The large current of zinc oxide valve plate compensates for the problem of low energy absorption, unstable use, and unclear service life of the resistance capacitance absorber. The characteristic of better response with higher frequency of the resistance capacitance circuit compensates for the problem of poor response of the zinc oxide valve plate type protector to high-frequency overvoltage of the wavelet head to ensure system insulation.
5. Set up a special isolation device (non gap) to isolate the capacitor, and the capacitor will not be connected to the circuit under normal power frequency voltage of the system. Avoid affecting the normal operation of the system.
6. Adopting a fully sealed structure, it effectively prevents the protector from affecting surrounding electrical equipment and is easy to install.
7. By adopting a special circuit structure, users can conduct a comprehensive side test after the product leaves the factory to verify its reliability, without the need to separately test the resistance capacitance circuit and zinc oxide circuit.

4�� Main technical parameters of JKB-ZR three-phase composite overvoltage protector

1. JKB-ZR composite overvoltage protector substation, P-type for distribution; Motor used as Z; motor type 35kV does not distinguish between P and Z

5�� Appearance and installation dimensions

6�� Installation requirements

1. The composite overvoltage protector should be connected between the vacuum circuit breaker (or vacuum switch contactor) and the protected equipment (such as motor or transformer), as shown in the figure on the right.
2. The capacity of the parallel compensation capacitor protected by the composite overvoltage protector is 6KV and not more than 4500KVAR; 10KV not exceeding 7500kVAR; 35kV not exceeding 15000kVAR. The energy absorption capacity of inductive loads such as motors and transformers is 2000 �� s square wave 400A (approximately 100 times that of ordinary impedance capacitance absorbers), which can be applied to all conventional inductive loads.
3. The composite overvoltage protector should be installed horizontally.
4. The A, B, and C three-phase terminals of the composite overvoltage protector are respectively connected to the A, B, and C three-phase lines of the protected equipment, and the grounding terminals marked with grounding symbols must be reliably grounded.
5. The cross-sectional area of the wire connecting the composite overvoltage protection device should not be less than 10mm2. It is recommended to use a flexible wire connection during installation to reduce the tension on the composite overvoltage protector.

7�� Ordering Notice
Please specify the following information when placing an order:
Product name and model, if there are special requirements, please specify technical parameters and other requirements;
Order quantity and time.

[Overvoltage absorber]NC-BHQ Cable sheath protector

2026-6-13 19:56:03

NC-BHQ cable sheath protector

Ultra high voltage cables are often forced to reduce their transmission capacity due to the breakdown and damage of the outer protective layer caused by overvoltage of the metal sheath. In order to reduce the overvoltage of the sheath to ground and avoid the breakdown of the outer protective layer, voltage limiting devices, namely protective layer protectors, are commonly used to ensure the reliable operation of the cable. Cable protective layer protectors have gone through the evolution history from spark gaps, silicon carbide valve plate protective layer protectors, to metal oxide protective layer protectors. In recent years, due to improvements in raw material formulations and manufacturing processes, the performance of domestic metal oxide protective layer protectors is gradually improving, and compared with many protective layer protectors imported with cables from abroad, the level has reached or even exceeded.

Single core power cable protective layer overvoltage protection technology is used to prevent multi-point grounding faults of cable metal protective layer caused by lightning overvoltage and internal overvoltage. The cable sheath protector reduces the overvoltage of the sheath to ground, ensuring reliable transmission of large capacity cables.

The cable sheath protector is applied in single core power cable lines to limit the induced overvoltage on the metal sheath of the cable, ensuring that the insulation of the protective layer is not broken down by overvoltage. This product can be used in grounded cable lines and cross connected cable lines.

NC-BHQ cable sheath protector

[fault indicator]GY-2PJ,GY-2PD ground short circuit fault indicator for GY-2PJ,GY-2PD( cable

2026-6-13 19:55:28

GY-2PJ, GY-2PD (cable) ground short circuit fault indicator

[fault indicator]GY-1PD,GY-1PE series overhead (grounded) short circuit fault indicator

2026-6-13 19:55:19

GY-1P series overhead (grounded) short circuit fault indicator

[fault indicator]AutoRANGERTM Overhead line fault indicator

2026-6-13 19:49:40

The AutorANGERTM overhead line fault indicator is easy to install and can quickly help maintenance personnel find the faulty line, thereby reducing fault detection time by more than 50% and greatly reducing losses caused by faults in power and industrial systems.

Characteristics and advantages
By automatically adjusting the action threshold, it is possible to reduce manpower, inventory, and improper application.
Applied in any overhead line, it can automatically adapt to the system situation.
It can distinguish between instantaneous faults and permanent faults, and tracks and records automatically eliminated faults.
The closing impact load braking function can be used in conjunction with automatic reclosing.
Intelligent and adaptive signal light brightness is adjusted according to natural light.
Adopting the best battery energy-saving technology in the industry, the light flashes continuously for more than 2500 hours.
The patented tilt descent braking function can prevent false indication after the circuit breaker is disconnected.
Quick and easy installation, using an insulated rod without the need for additional clamps or bolts, and maintenance free.

Application and Troubleshooting
Applied to overhead power lines
Instantaneous faults provide an eight hour fault indication, allowing line personnel to troubleshoot the faulty section of the line.
Investigate the lines that automatically clear faults and the lines that successfully reclose after tripping to improve the reliability of power supply.

Install and run
The AutorANGERTM fault indicator can be easily installed on overhead conductors through insulating rods for single-phase or three-phase applications. The fault indicator is equipped with a highly integrated microprocessor that continuously samples the load current in the system and automatically adjusts the threshold based on the sampled current value.
Instantaneous and permanent fault indication
After the fault occurs, the fault indicator flashes a red light to indicate a permanent fault. Subsequently, the fault indicator enters a two minute latch mode, allowing for reclosing and switching actions. Two minutes later, AutorANGERTM will detect the system voltage and load current to determine whether the fault is transient or permanent. If it is an instantaneous fault, the system voltage and system load current will reset. Otherwise, the red light indicating a permanent fault will display for 4 or 8 hours based on the current before the fault.
Day and Night Modes
Built in AutorAngelTM fault indicator with photoelectric sensor to detect natural light conditions. In daytime mode, the lights facing forward on both sides flash at maximum brightness to indicate a permanent fault. In night mode, the brightness of these two lights is reduced to save energy (as shown in the picture). In this mode, a set of built-in lights simultaneously illuminate the transparent housing of the entire indicator, ensuring visibility at a distance of over 1000 inches from the indicator and adapting to 360 degree angles. The pulse adjustment circuit with flashing lights optimizes brightness and battery life.

Technical indicators
Fault detection range: 50A to 1200A
Voltage applicable range: 4160V to 69kV
Maximum fault current: 25kA for 10 consecutive cycles
Temperature range: -40 �� to 85 ��
Action response time: 24ms
Installation requirements for wires: diameter between 0.3 and 1.50 feet
Flashing reset time: 8 hours when the load current is between 50 and 100A; When the load current is between 200 and 1200A, 4 hours
Battery: 3.6V, 8.5Ah high-energy lithium battery, designed for a lifespan of 15 years
Flashing time: Over 2500 hours (650 4-hour flashing faults) Weight: 1.27 pounds (575 grams)

quality assurance
Designed according to IEEE-495 standard, with an eight year quality assurance

AutorANGERTM overhead line fault indicator

[fault indicator]DS-2DJ Cable grounding type fault indicator

2026-6-13 19:49:31

The DS-2DJ cable grounding fault indicator samples the first half wave of the capacitive current at the moment of grounding and the first half wave of the voltage at the moment of grounding, compares their phases, and when the capacitive current at the moment of sampling grounding suddenly changes and exceeds a certain value, and is the same as the first half wave of the voltage at the moment of grounding, and the conductor to ground voltage decreases, it is judged that the line has been grounded. Otherwise, the line has not been grounded.

DS-2DJ cable grounding fault indicator

[fault indicator]Cable type short circuit fault indicator (photoelectric display)

2026-6-13 19:49:22

DS-2DG short circuit fault photoelectric indicator, mainly used on ring main units and box transformers, with small size and easy installation.

When a short circuit fault occurs in the circuit, the LEO red light immediately lights up to indicate the fault.

Functional Features
The adjacent anti-interference ability is less than 10cm
It has a self checking function to ensure that the fault indicator is working properly
The photosensitive switch is safe and convenient to use

Installation method of DS-2DG cable type short circuit fault indicator (photoelectric display)

Remove the U-shaped hoop, thread the cable through the hoop, install the hoop, and tighten the bolts to complete the installation.
Note: The functional benefits, technical indicators, and working principle are the same as DS-2DX

[fault indicator]DS-2DX Cable type short circuit fault indicator (flip over display)

2026-6-13 19:49:13

DS-2DX cable type short circuit fault indicator (flip over display) The working principle of the cable type short circuit DS-2DX is the same as that of the overhead type short circuit DS-1DX. The overhead type is used for overhead lines (on bare and insulated wires), while the cable type is used for cable lines such as ring main units, switchgear, and box type transformers. When a short circuit occurs in the circuit, the flipping sign displays in red.
Installation method

Open the back spring and clip the indicator onto the cable to use.

Note: The functional benefits, technical indicators, and working principle are the same as DS-1DX

[fault indicator]DS-JDG Multi functional (four in one) intelligent line fault indicator

2026-6-13 19:49:04

DS-JDG has the same appearance, features, functions, applications, and technical specifications as DS-JDX. They have the same internal structure, but DS-JDG is equipped with a night time luminous device.

Overview

DS-JDG multifunctional (four in one) intelligent line fault indicator: In response to feedback from a large number of domestic customers, it is necessary to wear a power strip to see the fault flipping effect at night, and to find the fault point one by one, the light irradiation must be carried out. The visual distance is short, and the speed of fault searching at night is relatively slow. Therefore, our company has added a very fast and intuitive night searching light emitting device to the original two in one product to meet customer requirements, namely the DS-JDG series that lights up at night during the day flipping.

working principle
The principle of grounding short circuit fault is the same as that of the two in one, and three phototubes and high brightness light-emitting tubes have been added to the original two in one fault indicator. When a line fault occurs during the day, the indicator will flip over to display. When it gets dark at night, the resistance of the photoelectric tube increases, so the microcontroller is turned on, the flip card is reset, and at the same time, the light-emitting tube is turned on to work. When dawn broke, due to the indicator not having reached the scheduled reset time, the resistance of the photoelectric tube received light decreased, and the microcontroller reset, cutting off the operation of the light-emitting tube and turning on the flipping mechanism, thus restoring the flipping indicator.

Scope of application
At the middle section and branch entrance of the long line, the fault section and branch of the line can be indicated.
At the exit of the substation, it can be determined whether the fault is caused by the user.
At the user's transformer inlet, it can be determined whether the fault is caused by the user's fault.
At the connection between cables and overhead lines, it is possible to distinguish whether the fault is in the cable section

[fault indicator]DS-1DX Overhead intelligent short circuit fault indicator

2026-6-13 19:48:56

DS-1DX overhead intelligent short circuit fault indicator is made of aviation materials with high strength and perspective in one step, and processed by nanotechnology. It has better perspective, anti pollution, anti-aging and maintenance free
Protect and have a long service life.
High performance lithium batteries have a lifespan of over 8 years.
A circuit board composed of imported components such as dedicated chips and microcontrollers.
Shell made of aviation and nanomaterials
Nickel plated and highly magnetic. A card wire structure that can be installed with electricity
Using red fluorescent paint, it has strong visual appeal and can clearly indicate under nighttime light. It also has a display rotation that does not fade under long-term outdoor ultraviolet irradiation

Function and benefits
Quickly identify the faulty line and point, and reduce the area of power outage;
Shorten troubleshooting time, improve electricity sales and power supply reliability;
Accurately indicating instantaneous faults is beneficial for eliminating power supply hazards;
Provided technical means for locating hidden permanent fault points;
Shortening the search time for fault points and reducing the labor intensity of line patrol personnel;
Define the fault responsibility area and clarify the responsible person;
To avoid the impact of traditional multiple line pulling and closing patrols on power equipment;

Technical specifications of DS-1DX overhead intelligent short-circuit fault indicator

Applicable voltage level: U �� 6KV
Action reset time: 6, 12, 24, 36 hours optional
Applicable wire current: I �� 600A
Operating environment temperature: -35 �� T ��+65
Applicable wire diameter: 16mm2 �� d �� 240mm2
Action frequency: �� 5000 times
Action response time: 0.06S �� t �� 3S
Static power consumption: �� 10 �� W

Principle of operation
Principle of short circuit detection: Based on the phenomenon of short circuit, the current undergoes a sudden positive change at the moment of short circuit, and the protection action is based on power outage.

Schematic diagram of fault indication used to determine short circuit:

If the indicators 2, 5, and 8 of phase B on line 2 and the indicators 3, 6, and 9 of phase C on line 2 turn red while the indicators 11 and 12 remain white, it can be determined that a short circuit fault has occurred at point D

DS-1DX Overhead Intelligent Short Circuit Fault Indicator

[fault indicator]Grounding and short circuit fault indicator

2026-6-13 19:48:47

DS-JD grounding and short-circuit fault indicator is a detection device designed for automatic monitoring of power supply systems in the power grid, suitable for high-voltage switchgear and power distribution systems below 35KV (inclusive). Mainly used for detecting, indicating, transmitting fault signals, and sending remote indication alarms, it also has memory and recovery functions. Enable maintenance personnel to accurately identify the interval where faults occur, improve their ability to analyze faults, quickly eliminate faults, narrow down power outage areas, and shorten power outage times. It plays an important role in ensuring the safe operation of the power grid and improving the quality of power supply. Mainly installed in the feed out circuit and power distribution system of electrical equipment such as high-voltage switchgear, ring main unit, cable distribution box, etc.

Main characteristics of DS-JD grounding and short circuit fault indicator

Strong anti-interference ability: The sensor and the detection object are always in an equipotential state, without any interference from surrounding electromagnetic fields, and there is no insulation breakdown problem. Optocoupler isolation and fiber/cable transmission ensure safe, accurate, reliable, and stable signal detection.
Using microcontroller chips: Due to occasional faults, the microcontroller chip and related circuits enter a sleep energy-saving state under normal circumstances; Once an interface fault signal occurs, immediately wake up the microcontroller chip and related circuits, start the setting program and start timing, causing the LED to work at a certain frequency and duty cycle, while the relay acts and remotely alarms; After running to the set reset time or pressing the reset button, the LED stops working, the relay resets, and the microcontroller chip and related circuits re-enter the sleep energy-saving state.
The sensor is passive: it directly detects signals online and uses the electromagnetic field changes generated by fault currents to generate pulse signals to excite the circuit, without affecting the normal operation of the power grid.
Lithium battery power supply: No external power supply required, stable and reliable power supply quality. Powered by a lithium battery, the service life can reach at least 8 years

Technical specifications for DS-JD grounding and short-circuit fault indicator
Short circuit fault sensor action current: 600A, 1000A (customizable)
Ground fault sensor operating current: 5A, 25A, 50A, 100A (customizable)
Display instrument working power supply: 3.6V
Export relay: 120VAC 1A, 30VDC 2A
Display instrument automatic reset time: 2h~40h
Transmission optical cable: 10m

Dimensions and wiring diagram

Installation and usage instructions
When installing the grounding fault sensor, unscrew the fastening screws at both ends of the steel strip to release it, then insert the three-phase cable into it. Tighten the fastening screws in the appropriate position, tighten the nylon cable tie to prevent it from loosening, and then connect the cable to the grounding sensor terminal on the back panel of the display instrument.
When installing the short-circuit fault sensor, unscrew the screws at both ends of the fastening ring, wrap the cable around it, tighten the screws on the fastening ring, and turn the adjusting screw to fix it on the cable. Then connect one end of the optical cable to the optical cable interface, tighten the screw, and connect the other end of the optical cable to the short-circuit interface on the back panel of the display instrument. When connecting
Pay attention to the phase.
After installation, press the detection/reset button for self check. The indicator light flashes, indicating that the instrument is working properly. Then press the button again, and the indicator light stops flashing, indicating that it has been put into operation.

[fault indicator]DS-JDX Ground short circuit two in one intelligent circuit fault indicator

2026-6-13 19:48:38

DS-JDX and DS-1DX have the same appearance, features, functions, applications, and technical specifications, but their internal structures are different and their working principles are also different.
There is only one core intelligent short circuit detection chip in DS-1DX, while DS-JDX has a two in one intelligent detection chip for detecting short circuits and ground faults.

Performance characteristics

Fault indication: During normal operation, the window is displayed in white; When a short circuit or grounding fault occurs, the window will display in red.
Online operation: directly installed on the line, maintenance free.
Strong anti-interference: The signal is not affected by lines, excitation inrush current, high-order harmonics, current fluctuations, or cable distributed capacitance bypass.
Automatic reset: After flipping the card, it will automatically reset according to the set time. The DS-2DX cable type short circuit indicator can be manually reset.
Live loading and unloading: Live loading and unloading are extremely simple and do not affect the operation of the line.

Working principle of DS-JDX grounding short circuit two in one intelligent circuit fault indicator
The principle of short-circuit fault in the two in one grounding short-circuit is the same as that of DS-1DX
Grounding detection principle: Sample the first half wave of capacitive current at the moment of grounding and the first half wave of voltage at the moment of grounding, compare their phases. When the capacitive current at the moment of sampling grounding suddenly changes and exceeds a certain value, and is in phase with the first half wave of voltage at the moment of grounding, and the wire to ground voltage decreases, it is judged that the line has been grounded. Otherwise, the line has not been grounded. Schematic diagram of fault indication used to determine grounding:

If the indicators of phase 3, 6, and 9 on line 2 turn red while indicator 12 remains white, it can be determined that point D has malfunctioned

Application scope of DS-JDX grounding short circuit two in one intelligent circuit fault indicator

Installed at the middle section and branch entrance of long lines, it can indicate the faulty section and branch of the line.
Installed at the exit of the substation, it can be determined whether the fault is caused by the user.
Installed at the user's transformer inlet, it can be determined whether the fault is caused by the user.
Installed at the connection between cables and overhead lines, it can distinguish whether the fault is in the cable section

Installation tools
The installation tools for DS-1DX and DS-JDX are shown in the bottom right corner of the figure. The specific installation method only requires placing an insulating rod at the bottom of the installation tool,
Unscrew the top bolt of the indicator and place it in the installation tool, then clip the indicator into the cable to complete the installation

DS-JDX Ground Short Circuit 2-in-1 Intelligent Circuit Fault Indicator

[Overvoltage absorber]ZR20 series resistor capacitor overvoltage absorber

2026-6-13 19:47:53

ZR20 series resistor capacitor overvoltage absorber
Model:
ZR20-7.2(12)-0.10/100,ZR20-40.5-0.05/100

Introduction:
ZR20 resistor capacitor overvoltage absorber is a new high-tech product. This product is developed to meet the GB/T2900.16-1996 capacitor standard, known as the "protective capacitor", used as a high-voltage capacitor for absorbing impulse voltage. It is connected in series with a non inductive resistor and then connected between the load side of the switch and the ground. It can effectively suppress the instantaneous oscillation and high-frequency current of the operating overvoltage, making the waveform of the overvoltage slow down, the steepness and amplitude reduced. In addition, the damping effect of the resistor quickly attenuates the high-frequency oscillation. It is very effective for any type of load equipment, preventing insulation damage caused by overvoltage during operation and ensuring safe operation of electrical equipment.
content
ZR20 series resistor capacitor overvoltage absorber

1�� Product Usage
In the medium voltage field, vacuum switch equipment (such as vacuum circuit breakers, vacuum load switches, vacuum disconnectors, and vacuum reclosers) has the advantages of small size, light weight, high performance, high reliability, easy maintenance and repair, and suitability for frequent operation. Therefore, it quickly occupied the market It has been widely used in various fields, especially in the medium voltage field in China, where the majority of the switchgear used is vacuum switchgear.
However, vacuum switchgear, due to its strong arc extinguishing ability, is prone to overvoltage during operations such as current interruption, multiple flashovers, and synchronous disconnection when disconnecting loads from motors, transformers, reactors, and capacitors.
With the increasing importance of stable and safe power supply in the power system. The requirements for improving system reliability and security are becoming increasingly stringent. Overvoltage operation poses a great danger. It greatly affects the stability of the system. Reliability and safety. Therefore, it must be developed. Develop and produce new overvoltage protection devices to meet the above requirements.
The ZR20 type resistive capacitive overvoltage absorber is a brand new high-tech product that can fully meet the above requirements. This product is a specialized capacitor called a "protective capacitor" (a capacitor connected between the power line and the ground to absorb surge overvoltage), which is connected in series with a resistor and then connected between the load side of the switch and it. It can effectively suppress the instantaneous oscillation and high-frequency current of the operating overvoltage, and make the waveform of the overvoltage gentler, steeper, and lower in amplitude. In addition, the electric damping effect and rapid attenuation of frequency oscillations are used Very effective for any type of load equipment It is to prevent insulation damage to electrical equipment caused by overvoltage during operation An ideal overvoltage protection device that is essential for ensuring the safe operation of electrical appliances

2�� Product model and significance

3�� Product features
The ZR20 type resistive capacitive overvoltage absorber has passed all type tests in the National High Voltage Apparatus Quality Supervision and Inspection Center and the High Voltage Apparatus Laboratory of Xi'an High Voltage Apparatus Research Institute. This product uses a dry-type high-voltage capacitor with self-healing function, which is truly a "protective capacitor". Its insulation level fully meets the requirements of GB311.1Un and 1.5Ln for long-term operation, and there is no flashover or breakdown after 4 hours of connected operation at 2Un. Safe operation under temporary voltage (including power frequency voltage rise, resonant overvoltage, single-phase grounding short circuit, and intermittent) arc grounding overvoltage.
The ZR20 type resistor capacitor overvoltage absorber has undergone multiple overvoltage absorption performance tests in the laboratory, which have shown that it can absorb standard lightning impulse voltage after passing through the resistor capacitor overvoltage absorber. This voltage drops very low. Generally not exceeding twice the peak value of the relative ground voltage. According to the on-site test data provided in the article "Research on Vacuum Circuit Breaker Switching Parallel Reactor Test" published in the 4th issue of Guangdong Electric Power in August 2003, the circuit breaker is divided into
When the gate is connected, the overvoltage when connecting zinc oxide lightning protection is 3.48 times, and when connecting resistance capacitance overvoltage absorption, it is recommended to install resistance capacitance devices again. This device can reduce both the amplitude of overvoltage and the frequency of voltage. It can be seen that the impedance capacitance overvoltage absorber is the most ideal and effective device for protecting various electrical equipment from damage caused by overvoltage during operation
4�� Technical parameters
The technical parameters of ZR20 type resistive capacitive overvoltage absorber are listed in the following table

Note: The accepted 1mm power frequency withstand voltage is 75% of the factory test voltage.

5�� Usage conditions
1. Environmental air temperature: -20 �� -40 ��
2. Altitude:<3000M
3. Relative humidity:<95% (at 20 ��)
4. The air in the installation site should not contain chemically corrosive gases and vapors, non-conductive and explosive dust.
5. Earthquake intensity not exceeding 8 degrees
6. Rated frequency 50HZ or 60HZ
If the high-order harmonics of the system exceed the requirements of GB/T14549-93, it should be explained when ordering.
6�� Instructions for use

1. ZR20 type resistor capacitor overvoltage absorber is connected to the lower end of the current transformer of the circuit breaker outlet
The closer the protected electrical equipment is to the ground, the better the effect. For specific wiring, please refer to the wiring schematic diagram.
It is recommended that if the previous stage does not have a resistor capacitor overvoltage absorber installed, a resistor capacitor overvoltage absorber should also be installed on the incoming side of the circuit breaker.

2. The capacity of the ZR20 type resistor capacitor overvoltage absorber protection motor is 100-10000KW
The capacity of the protective transformer is 100-45000KVA, and the capacity of the protective capacitor is 1000-10000Kvar.

7�� Appearance and installation dimensions

8�� Transportation and Storage
1. ZR20 type resistive capacitive overvoltage absorber is packed and transported.
2. During transportation, it should be protected from rain, handled with care, kept upright, bumped, and dropped.
3. When stored, it should be kept in an upright position, with an air temperature range of -20 ° C to 40 ° C, and no flammable or explosive gases or corrosive chemicals are allowed.
9�� Acceptance and installation
1. Check the appearance quality of the impedance capacitance overvoltage absorber and the condition of the metal accessories.
2. Measure the capacitance, tan ��, and resistance values with an electric bridge to see if there are any changes from the factory values.
3. The 1-minute power frequency withstand voltage test shall be conducted at 75% of the factory test value, or a direct current voltage (twice the power frequency withstand voltage value) test can be used. During the experiment, single-phase voltage should be applied, and the other two phases should be grounded together with the grounding point. After the experiment is completed, it must be fully discharged until it is completely discharged.
4. It is best to use single or multiple copper wires for installation, and excessive tension should be avoided on the impedance capacitance overvoltage absorber. The cross-sectional area of the wire is 7.2KV and 12KV>4mm2.40.5KV>6mm2. The areas marked with grounding symbols should be reliably grounded, and the carrying surface of the grounding wire should also meet the above requirements. If a single-phase structure is used, the net distance between the charged bodies and the ground during installation should be 7.2KV>100mm, 12KV>125mm, and 40.5KV>325mm.
5. The resistor capacitor overvoltage absorber should be installed vertically upwards, and other installation forms should be specified when ordering.

10�� Usage and maintenance
1. The resistance capacitance overvoltage absorber is a maintenance free equipment. When it is removed or inspected after use, it must be fully discharged until it is completely discharged, otherwise it will endanger personal safety.
2. The resistance capacitance overvoltage absorber must undergo a preventive test once a year, and the withstand voltage test can use either power frequency or DC. The test voltage and acceptance test are the same. Measure the capacitance and tan values of capacitors (excluding resistance) using a bridge to compare with factory data. The manufacturing plant provides consulting services at any time. Practice has proven that accidents are caused by failure to conduct preventive tests in accordance with the requirements of this article, and therefore it is particularly emphasized that they must be carried out.

11�� Methods for diagnosing faults
The capacitance and tan values of the capacitance part of the impedance capacitance overvoltage absorber are measured using a high-precision capacitance bridge when the absorber is put into operation. When conducting preventive tests, the same bridge should be used to measure the capacitance and tan values. And compare with the previous measurement value to see if there is any change. If the capacitance of the 40.5KV product increases by 2.5% and the capacitance of 7.2KV and 12KV increases by more than 5%, it indicates that there is an internal fault in the capacitor and it should be replaced in a timely manner. If the measured tan&value increases significantly, it should also be replaced.
When conditions permit, a withstand voltage test can also be conducted, using either power frequency withstand voltage or DC withstand voltage. The withstand voltage value should be the same as the acceptance test, and there should be no flashover or breakdown during the test before continuing to operate. Otherwise, it must be replaced.
12�� Ordering Notice
1. When placing an order, the voltage level and quantity of the product used must be specified.
2. Please indicate the model of the switchgear where the product is installed and the name and capacity of the protected equipment when placing an order.
3. If there are special requirements, please specify them when placing an order.

[fault indicator]EKL-3.1 type fault indicator

2026-6-13 19:47:10

The EKL-3.1 fault indicator is an assembled component Used for detecting ground faults and short circuit faults It operates in a star shaped network with only one current input port and medium voltage The minimum value of grounding fault current must be 10A (resistance grounding or fixed grounding grid) The EKL-3.1 fault indicator must be installed on each branch of the network to indicate
a) Short circuit fault detection: Each of the three wires is indicated by an indicator light
b) Ground fault detection: There is a total of one indicator light
c) Remote signal: Remote signals can be used to indicate short circuits and ground faults indiscriminately, or remote signals can be used to differentiate between ground faults
Indicate short circuit and ground fault

Design the composition of grounding and short-circuit fault indicators: 3 short-circuit sensors, 1 grounding fault sensor, 1 reading device, and connecting wire or fiber optic cable reading device are installed in a plastic housing with devices for measuring current and setting fault indication time limits
A ground fault is indicated by a flashing indicator light, while a short circuit fault is indicated by one indicator light on each of the three wires The indicator shell has an indicator function detection key and an indicator status restoration key. The sensor is also equipped with a plastic casing, and the coil inside the casing is used to sense the current caused by short circuit or grounding. Sensors can be connected to wires or optical cables according to assembly requirements. The fully cast plastic casing meets the IP65 protection standard
Zero voltage data transmission between short-circuit/grounding sensors and reading devices can be achieved through optical cables. The optical cable is made of PMMA material and has a maximum length of 10 meters
After setting the fault current value, once the current value measured by the coil in the sensor is greater than the set fault value, the real-time current pulse is transmitted to the indicator and read, and the indicator light will also send a fault signal to the outside accordingly There is also a minimum pulse delay setting device inside the indicator, which is used to measure the delay of the current pulse captured by the sensor and compare it with the set value, thereby avoiding erroneous indications caused by the instantaneous peak current being too high when the power grid is energized or in other situations Each device can set up to four minimum pulse delays. The specific setting values have been set according to the buyer's wishes before leaving the factory Device reset 1. It can be controlled by a timer, and after the set indication duration ends, it will automatically return to the non indication state. Each device can be set with four indicator durations, ranging from 0.5 hours to 40 hours. 2. Manually turn back the button. 3. The power grid will automatically return to its original position after being powered on
The installation indicator is installed outside the high voltage zone. Short circuit sensors can be installed on high-voltage wires with or without shielding. The ground fault sensor must be installed around three wire cores to ensure that the total current of the three wires is measured When installing the sensor, its frame can be opened The short-circuit sensor is connected to the indicator through an optical cable, and the grounding sensor is connected through a wire
Overview of Technical Data

Short circuit fault current definition value setting: 100-1500 A
Grounding fault current definition value setting: 100--1500 A10 A --200 A*
Error range:+/-10%
Working environment temperature: -18 degrees Celsius to+60 degrees Celsius

indicator
Indication time setting: Minimum pulse delay: between 0.5 hours and 40 hours (4 values) between 20 milliseconds and 500 milliseconds (4 values)
Indicator required current: standby state requires 5-10 A, startup indicator requires 60A

Power indicator battery requirements: -230V AC (rechargeable batteries are also available) -9V to 110V DC - lithium battery

Remote indication: Shell size: Grounding and short circuit: Maximum 230V AC/50 to 150 watts

Surface installation of indicator housing 76x140x42mm (length, height, width)
Embedded installation 96x48x63mm (length, height, width)
Sensor housing short circuit 38x38x26mm (length, height, width) grounded 38x38x26mm (length, height, width)

EKL-3.1 type fault indicator

[fault indicator]EKL1 type fault indicator

2026-6-13 19:47:01

Overview of EKL1 Fault Indicator:

Short circuit and ground fault indicator is a device used to detect short circuit and ground faults. In the ring network distribution system, especially in systems that extensively use ring network load switches, if a short circuit fault or grounding fault occurs in the next and distribution network systems, the higher-level power supply system must be disconnected within the specified time to prevent major accidents. By using this product, the faulty part can be marked. Maintenance personnel can quickly locate the faulty section based on the alarm signal of this indicator, disconnect the faulty section, and promptly restore power supply to the fault free section, which can save a lot of work time, reduce power outage time and scope.
The EKL series grounding and short-circuit fault display includes models: EKL1, EKL2, EKL3, EKL4.

EKL product features:

1. Short circuit alarm indication: The short circuit sensor constantly detects the current in the power supply line. When its value reaches or exceeds the short-circuit current activation alarm setting value (which can be set before leaving the factory according to user requirements), the short circuit sensor sends an alarm signal. After the host receives this signal through optical fiber, it generates an alarm indication signal (the indicator light flashes rapidly).
2. Grounding alarm indication: When the grounding sensor detects that the current in the grounding line reaches or exceeds the grounding current threshold (which can be set before leaving the factory according to user requirements), an alarm signal is sent. After the host receives this signal through cable or optical fiber, a corresponding alarm indication signal is generated (the indicator light flashes).
3. Low battery warning indicator: When the battery voltage inside the indicator drops from 3.6V to 2.7V, an alarm signal is generated to prompt maintenance personnel to replace the battery.
4. Remote transmission of alarm information: The indicator host can drive corresponding relay actions based on different alarm indication signals for remote signal transmission.
5. Automatic reset: When the indicator generates an alarm, within the set time, if there is no manual reset, the indicator can be automatically reset.
6. Testing and resetting: When the indicator generates an alarm and the fault is eliminated (the indicator light flashes slowly), the alarm status can be cleared by pressing the button on the indicator host panel. In normal state (without alarm signal), press and hold the button on the front panel for 1 second. The short circuit and grounding alarm indicators on the panel will flash, and the fault remote relay will be engaged, indicating that the working state is normal. After becoming slow flashing (2 seconds later), press this button again to restore normal operation.

Main technical parameters of EKL1 fault indicator:
Short circuit fault action current: 150A-1500A
Ground fault action current: 10A-100A
Accuracy: ± 10%
Environmental temperature: -25 to+70 ��
Environmental humidity:+40 �� Relative humidity �� 95%
Power: standby �� 0.01mA; indication �� 0.5mA
Power supply: lithium battery 3.6V/2.25Ah
Automatic reset time: adjustable from 7Sec-2h-4h-8h, other settings can be reserved
Output relay contact capacity: 230V AC 1A/125VDC 1A/30VDC 2A
Display box size: 96 (W) × 49 (H) × 88 (D) mm
Display panel opening size: 92 (W) × 44 (H) mm
Sensor size: 40 (W) × 40 (H) × 27 (D) mm

Protection level: IP40 display, IP65 sensor

[fault indicator]Cable type short circuit fault indicator

2026-6-13 19:46:51

ESI-2S cable type short circuit fault indicator features:

1. Fault: When a short circuit fault occurs in the tested circuit, the fault indicator light will flash red for 12 hours and then automatically reset and stop; After the fault indication state ends, it automatically enters the monitoring indication state;
2. Self check function: When the fault indicator is in normal monitoring state, the status indicator light will flash green light twice every 30 seconds, indicating that the IMS-S2 fault indicator is in normal monitoring state; When the fault indicator is low on battery, the status indicator light flashes yellow once every 10 seconds to prompt the user to replace it;
3. Automatic reset: Automatic delay (time can be set) reset, maintenance free;
4. High reliability: Built in high-sensitivity sensor with high indication accuracy;
5. Online operation: directly installed on the cable, can run for a long time, maintenance free;
6. Fireproof: Made of refractory materials, it will not become a ignition point in the ring main unit and branch box;

Installation diagram of ESI-2S cable type short circuit fault indicator:

ESI-2S cable type short circuit fault indicator

[fault indicator]ALPHA/M type fault indicator

2026-6-13 19:39:27

Description:
The ALPHA/E type short circuit fault indicator unit mainly consists of an electronic circuit, a micro motor with a rotating handle, and three rectangular red flip cards The operating mode of the action current and SCADA contacts can be selected by jumper This short-circuit fault indicator can be used to test the functionality of the entire circuit at any time by rotating the handle to the right
Technical Specifications:
Calibration pulse: 100ms
Action current: 400A, 600A, 800A, 1000A, on-site jumper selection
Accuracy: ± 15%

Reset: Manual
SCADA contacts: selection of jumper wires between normally open and normally closed contacts or fixed tripping contacts,
Contact parameters: 250V/3A/30W/maximum 60VA
Shell: Plug in polycarbonate shell, compliant with standard ICE61554
Attachment: 4 fixed spring plates
Installation size: The recommended opening size for the switchgear panel is (92+0.8) × (45+0.6) mm
Installation position: Horizontal external dimensions: 96 × 48 × 97MM (width × height × depth)
Weight: Approximately 1KG (including CT)
Sensor: Multi layer silicon steel sheet transformer with coil

[fault indicator]SFI-1 type fault indicator

2026-6-13 19:39:18

Introduction to SFI-1 Fault Indicator:

The SFI-1 fault indicator is an automatic fault detection device developed and produced by Shanghai Heyu Company, which can detect short-circuit faults. After testing by the National Electric Power Equipment and Instrument Inspection and Testing Center, all technical indicators have reached an advanced level. This product is widely used for overhead use. It can accurately identify faulty lines and fault points, with stable performance, high accuracy, strong anti-interference ability, beautiful appearance, and easy installation.

Function and Features:
Fault indication: During normal operation, the window is displayed in white; When a short circuit fault occurs, the window is displayed in red.
Automatic reset: After the power supply is restored to the line, the fault indicator will automatically reset. The reset time can be selected by the customer according to the line environment, patrol length, department requirements, etc.
1. Live loading and unloading: Live loading and unloading are extremely simple and do not affect the operation of the line.
2. Provided technical means for identifying hidden fault points.
3. Quickly identify the faulty line and fault point to shorten the troubleshooting time.
4. Accurately indicating instantaneous faults is beneficial for eliminating power supply hazards.
5. Avoid the impact of traditional multiple line pulling and closing patrols on power equipment.
Detection principle:
Short circuit section: Current detection will only indicate when a short circuit occurs, the current suddenly increases, and the switch trips.
Structural characteristics:
1. A circuit board composed of the latest digital circuits, combined with imported components such as dedicated chips and microcontrollers.
2. The card wire structure is made of magnetic material and treated with nickel plating, with extremely strong magnetic conductivity and strong corrosion resistance.
3. The display part adopts red fluorescent paint, which has strong visual appeal and can clearly indicate under low light conditions at night. It also does not fade under long-term outdoor ultraviolet radiation.
4. High strength and high perspective aviation materials are used for one-time molding, and after special chemical technology treatment, the perspective is better, anti pollution and anti-aging.

[Overvoltage absorber]FGBZ,FGBS Composite Overvoltage Protector

2026-6-13 19:38:52

The FGBZ and FGBS composite overvoltage protector is currently the most advanced overvoltage protector. It is an organic combination of resistance capacitance absorber and lightning arrester, which can effectively protect against operating overvoltage and also has lightning protection function. Widely used in motors, reactors, transformers, and distribution lines for vacuum circuit breaker operation.
This product adopts a four-star three-phase combination connection method and adds a contactless self-control device. It has excellent phase to phase protection function, and at the same time, during normal operation of the power grid and single-phase grounding faults, the vulnerable capacitor part of the resistance and capacitance absorber is isolated from the power grid, avoiding the high accident rate of the resistance and capacitance absorber itself. The lightning arrester is connected to the capacitance part using a special structure, which effectively reduces the volume and makes the overall structure compact and beautiful.
The FGBZ and FGBS composite overvoltage protectors not only retain the overall technical characteristics that should be possessed by a general resistor capacitor absorber in parallel with a lightning arrester, but also have the following advantages: good phase to phase protection; There is no need to separately calculate the insulation coordination between the resistance capacitance absorber and the lightning arrester; Not affected by high-order harmonic interference from the power grid; Will not provide additional grounding capacitor current to the power grid, which is beneficial for overall electrical design; Beneficial for eliminating resonance overvoltage; Low dispersion and not affected by atmospheric conditions; A discharge action recorder can be installed to understand and monitor the operation status of the protector.

1�� Application and execution standards of FGBZ and FGBS composite overvoltage protectors
The dedicated protection equipment for overvoltage caused by vacuum switch opening and closing in AC medium voltage 3-66kV power systems is a resistance capacitance absorber, but it cannot protect against lightning and other high amplitude overvoltages. On the other hand, even with a modular design, lightning arresters still cannot achieve the ideal effect of completely preventing hazardous operating overvoltage. The product that combines the two in the correct configuration is a composite overvoltage protector (hereinafter referred to as the protector).
This protector is designed for use inside cabinets and is compatible with vacuum switches. The device combines high-frequency oscillation absorption and high amplitude valve type voltage limiting, which can effectively limit operating overvoltage and has strong lightning protection function. The composite module design eliminates the complex calculation and selection of independent design by users, greatly reducing the error rate of insulation coordination in electrical design. Adopting a four-star three-phase combination connection method, it meets the actual situation of China's power grid and has strong inter phase protection capability. Dry design, fully enclosed structure, safe and durable, compact and beautiful, effectively achieving full functionality and miniaturization.
The technical specifications for protectors are implemented according to the following standards:
GB11032-2000 "AC gapless metal oxide lightning arrester"
JB/T9672-1999 "Metal Oxide Surge Arresters with Series Gap"
GB311.1-1997 "Insulation Coordination for High Voltage Transmission and Transformation Equipment"
GB11024.1-2001 "Parallel Capacitors for Electric Power above 1kV"
GB3667-1997 "AC Motor Capacitors"
DL/T620-1997 "Overvoltage Protection and Insulation Coordination for AC Electrical Installations"

2�� Usage conditions for FGBZ and FGBS composite overvoltage protectors
*Environmental temperature: not higher than+40 ��, not lower than -40 ��;
*Altitude: not exceeding 1500m (above 1500m is a specialized high-altitude product);
*Power frequency: 50 ± 2Hz; 60 ± 2Hz;
*Seismic intensity: 7 degrees or below;
*Maximum wind speed: 35m/s;
*There is no corrosive, explosive gas or dust in the air at the installation point;
*The short-term power frequency voltage rise at the installation point shall not exceed the rated voltage of the absorber.

3�� Model Definition

[fault indicator]EKL4 type short circuit and ground fault indicator

2026-6-13 19:37:41

The EKL4 short circuit and ground fault indicator is a device used to detect short circuits and ground faults. In the ring network distribution system, especially in systems that extensively use ring network load switches, if a short circuit fault or grounding fault occurs in the lower level distribution network system, the upper level power supply system must be disconnected within the specified time to prevent major accidents. By using this product, the faulty part can be marked. Maintenance personnel can quickly locate the faulty section based on the alarm signal of this indicator, disconnect the faulty section, and promptly restore power supply to the fault free section, which can save a lot of work time, reduce power outage time and scope.

Main technical parameters of EKL4 short circuit and ground fault indicator:
Short circuit fault action current: 80A-1500A
Ground fault action current: 20A-200A
Accuracy: ± 10%
Environmental temperature: -25 to+70 ��
Environmental humidity:+40 �� Relative humidity �� 95%
Power: standby �� 0.01mA; indication �� 0.5mA
Power supply: Lithium battery 3.6V/2.25Ah
Automatic reset time: adjustable from 7Sec-2h-4h-8h, other settings can be reserved
Output relay contact capacity: 230VAC 1A/125VDC 1A/30VDC 2A
Dimensions (W × H × D)
Reading instrument:
Panel mounted reading instrument: 92 × 46 × 63mm
Surface mounted reading instrument: 76 × 140 × 42mm
Sensor:
Short circuit sensor: 40 × 43 × 26mm
Ground fault sensor: 40 × 43 × 26mm
The following are the improvements or advantages of EKL4 compared to EKL3:
1. Composition of short circuit and ground fault indicator:
Three short-circuit fault sensors
A ground fault sensor
A reading instrument
Four optical cables
The prominent feature of EKL4 short circuit and ground fault indicator is that all connections between sensors and reading instruments are made through optical cables. This is an advantage as the sensor can be directly installed in unshielded cable areas. The result is that shielding may not necessarily pass through the frame, but can independently pass through the steel strip. This method provides common applications for short circuits and ground faults.
2. The adjustment of operating current, reset time, and battery replacement can all be operated directly without opening the box.

[fault indicator]EKL3 type short circuit and ground fault indicator

2026-6-13 19:37:32

The EKL3 short circuit and ground fault indicator is a device used to detect short circuits and ground faults. In the ring network distribution system, especially in systems that extensively use ring network load switches, if a short circuit fault or grounding fault occurs in the lower level distribution network system, the upper level power supply system must be disconnected within the specified time to prevent major accidents. By using this product, the faulty part can be marked. Maintenance personnel can quickly locate the faulty section based on the alarm signal of this indicator, disconnect the faulty section, and promptly restore power supply to the fault free section, which can save a lot of work time, reduce power outage time and scope.

Design
The short circuit and ground fault indicator consists of the following parts:
Three short-circuit fault sensors
A ground fault sensor
A reading instrument
The connecting wire is a cable and/or optical cable
The reading instrument is installed in a plastic box, which is equipped with a time reset circuit and an assignment circuit. Ground faults are indicated by a flashing LED light, and short circuit faults on each cable are indicated by a flashing LED light. The reading instrument is equipped with a test/reset button. Each sensor consists of a plastic housing and a coil that detects pulse currents caused by short circuits and ground faults. Depending on the version of the sensor, it can be connected to wires or fixed to the sensor, or plugged into a fiber optic sensor. The housing is injection molded and meets IP usage conditions. Fiber optic cables can safely transmit data between sensors and reading instruments through high-voltage zones. This type of fiber optic cable is made of PMMA and has an effective length of up to 10 meters
Main technical parameters:
Short circuit fault action current: 150A-1500A
Ground fault action current: 10A-100A
Accuracy: ± 10%
Environmental temperature: -25 to+70 ��
Environmental humidity:+40 �� Relative humidity �� 95%
Power: standby �� 0.01mA; indication �� 0.5mA
Power supply: Lithium battery 3.6V/2.25Ah
Automatic reset time: adjustable from 7Sec-2h-4h-8h, other settings can be reserved
Output relay contact capacity: 230V AC 1A/125VDC 1A/30VDC 2A
Dimensions (W × H × D)
Panel mounted reading instrument: 92 × 46 × 63mm
Surface mounted reading instrument: 92 × 140 × 42mm
sensor
Short circuit sensor: 38 × 38 × 26mm
Ground fault sensor: 38 × 38 × 26mm

EKL product features:
1. Short circuit alarm indication: The short circuit sensor constantly detects the current in the power supply line. When its value reaches or exceeds the short-circuit current2. Grounding alarm indication: When the grounding sensor detects that the current in the grounding line reaches or exceeds the grounding current threshold (which can be set before leaving the factory according to user requirements), an alarm signal is sent. After the host receives this signal through cable or optical fiber, a corresponding alarm indication signal is generated (the indicator light flashes).
3. Low battery warning indicator: When the battery voltage inside the indicator drops from 3.6V to 2.7V, an alarm signal is generated to prompt maintenance personnel to replace the battery.
4. Remote transmission of alarm information: The indicator host can drive corresponding relay actions based on different alarm indication signals for remote signal transmission.
5. Automatic reset: When the indicator generates an alarm, within the set time, if there is no manual reset, the indicator can be automatically reset.
6. Testing and resetting: When the indicator generates an alarm and the fault is eliminated (the indicator light flashes slowly), the alarm status can be cleared by pressing the button on the indicator host panel. In normal state (without alarm signal), press and hold the button on the front panel for 1 second. The short circuit and grounding alarm indicators on the panel will flash, and the fault remote relay will be engaged, indicating that the working state is normal. After becoming slow flashing (2 seconds later), press this button again to restore normal state.

[Harmonic eliminator]6 to 35KV Nonlinear Resistance Harmonic Reduction Dampers

2026-6-13 19:37:23

1�� Product Introduction:
The TXQ (3) type 6-35kV voltage transformer neutral point nonlinear resistance harmonic damper (referred to as harmonic damper) is a nonlinear resistance harmonic damping device installed between the neutral point of the primary winding Y of the 6-35kV voltage transformer (hereinafter referred to as transformer or PT) and the ground. The product model of the harmonic eliminator - TXQ represents a harmonic eliminator designed according to traditional appearance; TXQ3 refers to a cylindrical harmonic eliminator designed for the third modification, with exposed resistor surfaces and no need for insulation jacket protection. The only difference between the two is their appearance, but their electrical performance is completely the same.
The DC electrical characteristics of TXQ (3) type 6-35kV harmonic eliminator are similar to traditional LXQ and RXQ type harmonic eliminators, but the structural design has been greatly improved from the perspective of increasing the thermal capacity of the harmonic eliminator. The harmonic eliminator uses SiC with excellent electrical performance and ultrafine particles as the substrate; Pressed into high-density, round cake shaped bodies by a large tonnage press; Under the restored atmosphere; Made by high-temperature sintering at thousands of degrees. The exposed surface structure of the resistor has been specially treated to withstand sunlight and rain, and can be directly used indoors and outdoors. It is popular among users due to its small size, light weight, fast heat dissipation, high strength, and easy installation.
2�� Application and Function
There are two related problems to be solved for voltage transformers in 6-35KV neutral point non effectively grounded power grids:
The overvoltage generated by the ferromagnetic resonance of the voltage transformer often causes insulation breakdown inside the equipment and discharge of the external insulation, and often leads to large-scale power outages due to delayed accident handling or the expansion of the accident.
2. The arc grounding in the power grid frequently burns out the voltage transformer.
The use of harmonic eliminators can effectively solve the above problems: eliminating or damping the ferromagnetic resonance overvoltage caused by the nonlinear excitation characteristics of voltage variation, which can lead to unstable phase voltage in the system; Can effectively suppress the overcurrent flowing through the voltage transformer winding during intermittent arc grounding, and prevent the burnout of the voltage transformer; Limit the inrush current generated in the primary circuit of the voltage transformer when the single-phase grounding disappears, which can damage the voltage transformer or cause the voltage transformer fuse to melt; When a single-phase grounding occurs in the system, it can protect the voltage transformer from damage for a long time.

3�� Main electrical performance:
Main performance parameters of TXQ (3) type 6-35KV harmonic eliminator (Table 1)

model			DC characteristic KV/mA	Nonlinear coefficient ��	Heat capacity 250mA/10min
TXQ (3) type 6-10KV	Electrified type		1.45��1.65/15	0.40��0.45	through
	Weak insulation type		1.38��1.45/15	0.40��0.45	through
	Plateau type		1.48��1.52/15	0.40��0.45	through
	Ultra small size		1.45��1.65/15	0.40��0.45	through
TXQ (3) type 35KV	Universal	A	4.0��4.2/42	0.40��0.45	through
	Universal	B	��2.80��2.85/50	0.30��0.40	through
	Weak insulation type		2.60��2.70/50	0.35��0.45	through
	Plateau type		1.90��2.10/15	0.35��0.45	through

The parameters in the table are typical product parameters. If the user has different requirements, production can be carried out according to the user's requirements.
4�� TXQ (3) type 6-35kV harmonic eliminator operating environment
1. Outdoor, installed near the transformer, although the harmonic eliminator has a rainproof function, it should not be directly exposed to sunlight and rain;
2. The ambient temperature ranges from -40 �� to+60 ��;
3. The frequency of the AC power system is 50HZ or 60HZ;
4. Areas with seismic intensity below 8 degrees.
5�� Installation of TXQ (3) type 6-35KV harmonic eliminator
1. Installation method: TXQ (3) type harmonic eliminator has a small volume and can be installed vertically or horizontally;
It can be directly fixed on the screw of the pressure transformer body (note that the fixing bolts of JDZJ-6-10 pressure transformers are not grounded). The grounding terminal of the harmonic eliminator needs to be connected to the grounding bolt. Also fixed on the bracket near the pressure change.

2. Wiring diagram (see Figure 1)

(1) When there are three single-phase voltage transformers (PT):
Before connecting the harmonic eliminator, the tails (X • Y • Z) of the three single-phase high-voltage windings are directly grounded or connected in parallel to the neutral point (0) for grounding.
When connecting the harmonic eliminator, the high-voltage winding tail or (0) directly grounded must be disconnected from the ground. The harmonic eliminator is connected between the neutral point (0) and the ground (the neutral point is no longer directly grounded).

(2) When the three-phase five column voltage transformer (PT) is used:
Before connecting the harmonic eliminator, the neutral point "0" of the three-phase five column voltage transformer should be directly grounded. When connecting the harmonic eliminator, the neutral point (0) must be disconnected from the ground, and the harmonic eliminator should be connected between the neutral point (0) and the ground (the neutral point is no longer directly grounded).
3. Main installation dimensions of harmonic eliminator:
(TXQ3 type, see Figure 2)

4. Parameter testing of TXQ (3) type harmonic eliminator
On site measurement can use a 1000V shaker to measure the insulation resistance of the harmonic eliminator, which is generally about 0.5M ��, and can be installed If it is necessary to measure the volt ampere characteristics and nonlinear coefficient �� of the harmonic eliminator, the following method can be used for measurement.
(1) Wiring diagram for measuring DC volt ampere characteristics: (see Figure 4)

(2) Testing the Nonlinear Coefficient �� Method:
When the DC characteristic of the harmonic eliminator is set to 15mA, the voltages U1 and U2 at both ends of the harmonic eliminator are measured at 50mA and 50mA DC, respectively; When the DC characteristics of the harmonic eliminator are 42mA or 50mA, the rigid nonlinear coefficients �� of the voltages U1 and U2 at both ends are measured for DC 100mA and 10mA, respectively
Voltage when U1=I1 is 50 (100) mA; Voltage when U2=I2 is 5 (10) mA;
lg
When I1=50 (100) mA, I2=5 (10) mA
lg=lg10=1
=lg

The mouth coefficient of the harmonic generator should comply with the values specified in Table 1.
(3) Thermal capacity spot check test: (see Figure 5)

Require the harmonic eliminator to withstand a 250mA power frequency current for 10 minutes without any burning or bursting phenomenon; When the harmonic eliminator is still in a high temperature condition, immediately spray water on the harmonic eliminator, and the harmonic eliminator body should be kept intact; After the harmonic eliminator is cooled and completely dried, its DC voltage change rate and DC nonlinear coefficient �� change rate are both not greater than 10%.

[Overvoltage absorber]FURB Large capacity high-voltage current limiting fuse combination protection device

2026-6-13 19:37:14

1. Product Overview

The power branches of various electrical equipment such as transformers, mutual inductors, capacitors, etc. in the power system have a small current under normal working conditions. However, once a short circuit occurs, the impedance of the circuit is small, resulting in a particularly large short-circuit current, which will cause great difficulties in selecting disconnect protection equipment; At the same time, the traditional disconnection protection equipment has a disconnection action time of several tens of milliseconds, which cannot quickly and effectively limit the amplitude of short-circuit current. The extremely large short-circuit current will cause impact damage to the insulation of electrical equipment such as generators and transformers; In addition, higher requirements have been placed on the dynamic and thermal stability of other equipment in the system, which inevitably increases equipment investment and is unsafe.
Based on the above issues, Shanghai Songbang Electric Co., Ltd. has developed and produced a FURB high-capacity high-voltage current limiting fuse combination protection device with independent intellectual property rights. This equipment is specifically designed to solve the problems of insufficient ability to break large short-circuit currents, slow time, and lack of overvoltage protection function of traditional fuses and circuit breakers

2. Product Usage and Performance
The FURB high-capacity high-voltage current limiting fuse combination protection device is mainly suitable for circuits with large short-circuit capacity in 3-35kV power systems, such as excitation transformers, plant transformers, isolation transformers, voltage transformers, and capacitors; It can withstand frequent connection and disconnection of normal working current, and can automatically limit current and quickly and reliably disconnect and protect against overvoltage for extremely large short-circuit currents. It can also be used as phase to phase short circuit protection and backup protection for power circuits.

3. Main features of the product
The FURB high-capacity high-voltage current limiting fuse combination protection device consists of a specially designed high-voltage high breaking capacity current limiting fuse, a specially designed high-voltage high-energy zinc oxide overvoltage protector connected in parallel at both ends, and a limit signal switch combination. Once a short circuit occurs in the circuit, the high-voltage current limiting fuse quickly melts within 2mS, immediately cutting off the short-circuit current. At the same time, a specially designed high-voltage high-energy zinc oxide varistor connected in parallel at both ends of the high-voltage current limiting fuse operates to limit the operating overvoltage generated when the fuse is disconnected within the specified value, and absorbs the magnetic field energy that decays the cutoff current to zero in the system, further improving the energy absorption safety margin of the fuse; At the same time as the high-voltage current limiting fuse is opened, the limit signal switch sends an action signal, which can be connected to the load switch (or circuit breaker) for linkage or to the control room for maintenance and fault finding.
Due to the inherent ampere second characteristic of high-voltage current limiting fuses, there is no need for any external mechanical or electrical protection equipment to operate them. Therefore, the reliability of high-voltage current limiting fuses is extremely high, and there will be no refusal or misoperation. Moreover, the operating speed of high-voltage current limiting fuses is much higher than that of mechanical circuit breakers. The short-circuit current is cut off before it rises, and the current amplitude can be limited to about 15% less than the expected transient peak of the short-circuit current, with a time not exceeding 2mS. This ensures that electrical equipment such as transformers, voltage transformers, and capacitors are no longer affected by the peak short-circuit current, avoiding damage to electrical equipment caused by several cycles of high current impact; Due to the current limiting and fast nature of high-voltage current limiting fuses, I2t is very small, which can ensure that electrical equipment such as transformers, voltage transformers, and capacitors do not explode, and the busbar connection does not need to consider dynamic and thermal stability issues.

4. Main working principle of FURB high-capacity high-voltage current limiting fuse combination protection device
The high-voltage current limiting fuse combination protector mainly uses the arc voltage of the continuous current arc at the moment of fuse melting to limit and cut off short-circuit current and provide overvoltage protection. The higher the arc voltage, the better. Excessive arc voltage is a type of overvoltage that can damage the insulation of electrical equipment and expand accidents. For this purpose, we have parallel connected a specially designed high-voltage high-energy zinc oxide varistor FR at both ends of FU, and its volt ampere characteristics are shown in Figure 2. As shown in the figure, when the voltage at both ends of FR rises to the set value, FR automatically switches from cutoff to conduction, limiting the overvoltage of FU and preventing it from damaging the equipment insulation. At the same time, FR conduction reduces the energy absorbed by FU through shunt. In short, parallel FR makes the operation of the protector safer and more reliable.

Figure 1 Schematic diagram 2 Voltage current characteristics of zinc oxide varistor

FURB high-capacity high-voltage current limiting fuse combination protection device

[Harmonic eliminator]SBX-WXYH microcomputer harmonic elimination device

2026-6-13 19:33:52

1. Model Description of SBX-WXYH Microcomputer Harmonic Elimination Device

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3. Technical Instructions for SBX-WXYH Microcomputer Harmonic Elimination Device
(1) Working power supply: AC 80-250V, 50-60Hz or DC 80-250V, power consumption less than 15W
(2) Environmental temperature: -20 to+50 ��;
(3) Environmental humidity: not exceeding 90% RH
(4) Eliminating resonant frequencies: 17Hz (1/3 division), 25Hz (1/2 division), 50Hz (power frequency), 150Hz (3rd harmonic)

4. Device features
(1) Suitable for various voltage levels and resonant frequencies (1/3 division, 1/2 division, power frequency, 3rd harmonic) with a wide range of applications;
(2) No need for tuning and debugging, automatically enters the running state after startup, with minimal maintenance;
(3) Distinguishable between ferromagnetic resonance, overvoltage, and single-phase grounding;
(4) Automatically display and record the occurrence time and related parameters (resonance frequency, amplitude) of ferromagnetic resonance;
(5) Can store 20 sets of fault information for recall and display;
(6) Configurable communication interface (RS232 or RS485);
(7) Output in contact closure mode or voice alarm output;

5. Working principle of the device
This device uses an 80C196 single-chip microcomputer as the core component to perform loop detection on PT open delta voltage (i.e. zero sequence voltage). Under normal operating conditions, if the voltage is less than 30V, the high-power harmonic elimination component (thyristor) inside the device is in a blocked state and has no impact on the system. When the voltage of the PT opening triangle is greater than 30V, it indicates that the system has malfunctioned. The device begins to collect data on the open delta voltage. By using digital signal processing techniques such as digital measurement, filtering, and amplification, the data is analyzed and calculated to determine the current fault state. If a certain frequency of ferromagnetic resonance occurs, the CPU immediately starts the harmonic elimination circuit (making the thyristor conductive) to quickly eliminate the ferromagnetic resonance under strong damping. After the elimination of ferromagnetic resonance, the CPU makes corresponding records, stores, and automatically alarms and displays relevant resonance information (including occurrence time, frequency, amplitude, etc.). If it is overvoltage or single-phase grounding, after the CPU makes a diagnosis, the device will display and alarm separately, and automatically record and store relevant fault information. Finally, the CPU returns to its initial state and continues to detect the open delta voltage.

6. Software composition of SBX-WXYH microcomputer harmonic elimination device
This device uses 80C196 assembly language to develop software, which mainly consists of monitoring program, floating-point operation library, diagnostic software, harmonic elimination, recording and other parts. The real-time monitoring program completes tasks such as voltage detection, sampling, diagnosis, harmonic elimination, clock, keyboard commands, and display. The simple block diagram is shown in Figure 1:

7. Hardware composition of the device
(1) Power Supply: This device uses a high-frequency switching power supply, which has strong anti-interference ability and allows for a large range of input voltage fluctuations. The output voltage is DC+5V, ± 12V
(2) Host part:
(3) The command and control center CPU of this device adopts the latest 16 bit microcontroller 80C196, which has the characteristics of fast computing speed, strong control capability, and safe and reliable operation. And it is equipped with an internal monitoring timer, which can free the system from crashes caused by software failures at any time, providing a guarantee for long-term safe and reliable operation;
(4) Program memory EPROM, used for storing instructions;
(5) Data storage RAM, used to store data calculation results, recall content, etc;
(6) Data acquisition part: Its function is to convert analog signals into digital signals for computer processing;
(7) Display section: Used as a clock under normal system conditions, it can display relevant fault information when the system malfunctions;
(8) Harmonic elimination control: Control the harmonic elimination circuit and activate high-power harmonic elimination components to quickly eliminate ferromagnetic resonances of various frequencies.

8. Installation of SBX-WXYH microcomputer harmonic elimination device
This device is installed on the PK screen or in the terminal box, and each device can be connected to 1-4 sections of busbars according to the user's selection. The schematic diagram of the terminal wiring after the device is as follows:
(1) 1PT * "and" 1PT "are respectively connected to the same name and non same name terminals of the first section of the busbar open delta voltage," 2PT * "and" 2PT "are respectively connected to the same name and non same name terminals of the second section of the busbar open delta voltage, and so on;
(2) The "power input" terminal can be connected to AC power or DC power without polarity. Its voltage range is 80-250V;
(3) The "external alarm" terminal is connected to the external alarm signal, and when there is no fault, it is a pair of normally open contacts. Close when the fault occurs and delay for about 1 minute until the fault disappears. Its contact capacity is DC 220V 0.5A. If the user needs, it can also be changed to voice alarm output, but it needs to be specified before ordering.
(4) Remote control port output:
(I) The serial port RS422/485 is a dual function port. When using RS485, only TXD+and RXD+need to be short circuited, and TXD - and RDX - need to be short circuited;
(II) Switching output: When ferromagnetic resonance occurs, 1-4 PT correspond to 1-4 sections of the busbar, and an alarm signal is output in a closed contact manner with a capacity of DC 24V/5A. The internal wiring is as follows:

9. Instructions for use
(1) Power supply: The indicator light is on when the power supply is normal. Otherwise, it should be checked whether the power supply or insurance is burnt out.
(2) Display section:
(I) The device enters the operating state immediately after being powered on, displaying the year, month, day, week, hour, minute, and second;
(II) When a single-phase grounding fault occurs in the system (such as the first section of the busbar or its associated line experiencing a single-phase grounding fault at 08:50:35 on March 8, 2003, with an open delta voltage of 60V and a current duration of 1 hour 08:08 seconds), the LCD screen displays the following content:
On March 8, 2003, at 08:50:35, busbar I was grounded at a voltage of approximately 60V for a duration of 01:08:08. Display time until the fault disappears;
(III) When the system experiences a resonance fault (such as the first section of the bus experiencing a 25Hz frequency at 8:46:06 on June 8, 2003)
When resonance occurs and the open triangle voltage is 70V, the LCD screen displays the following content:
On June 8, 2003 at 08:46:06, a 25Hz resonance occurred on busbar I, with an amplitude of approximately 70V. Display time until 1 minute after the fault disappears.
(3) Button section
(I) "Reset" button: When the device malfunctions, please use the "Reset" button to restart the device;
(II) "Remembrance" button: When a resonance fault occurs in the system, the screen will display the following prompt: "Please press the" Remembrance "button to view the fault information". At this time, pressing the "Remembrance" button can view the latest fault information. Continuing on time will result in a total of 20 resonance fault messages. The display form is the same as when resonance occurs;
(III) "Timing" button: To adjust the year, month, day, week, and clock, press the "Timing" button. When the data to be adjusted flashes, press the "Plus One" or "Minus One" button. After adjustment, please continue to press the "time calibration" button until all data stops flashing, thus completing one time calibration process.
10. Design specifications and ordering instructions
(1) The size of the opening on the screen of the chassis:
All models are 210 × 180 (width × height), and the depth of the chassis is 250mm
(2) The external dimensions of the chassis are as follows:
(3) Ordering precautions
If users need serial port function or language alarm function when ordering this product, please indicate it, otherwise it will be considered as not configured with the above functions. At the same time (refer to model 2 instructions), it is necessary to indicate the number of busbars carried.

[Overvoltage absorber]MS type single/three-phase power module surge protector

2026-6-13 19:31:22

Single/three-phase power module surge protector
B. C and D level protection, limited voltage power supply SPDB level adopts multi-stage pressure-sensitive embedded parallel technology, modular structure C and D levels adopt separate unit structure, composed of a base and pluggable protection modules, discharge current Imax: 40, 60, 80, 120 and 160kA (8/20 µ S) visual fault indication window, the working status is clear at a glance, and remote signaling contacts can be selected to achieve remote monitoring. 1-2 standard module widths, 35mm DIN rail installation can be installed in the main distribution box or floor distribution box

MS40M MS60/80/100/120/160M

Product Model	MS40M	MS80M	MS120M
Maximum continuous operating voltage (AC):	385V
Nominal discharge current 8/20 �� s	20KA	40KA	sixty
Maximum discharge current 8/20 �� s	40kA	80kA	one hundred and twenty
Voltage protection level UP	��1.8KV	��2.8KV	��3.0KV
protected mode	L-N-PE(3+1) L-N-PE(3+1)
Module width	A standard module width	Two standard module widths	Two standard module widths
remark

MS type single/three-phase power module surge protector

[Overvoltage absorber]MS single-phase power box type surge protector

2026-6-13 19:31:13

MS type single-phase power box surge protector

Product Model	MS20-1L	MS40-1L	MS60-1L	MS80-1L
Working voltage (AC)	L-N ��220V
Maximum continuous operating voltage (AC):	385V
Nominal discharge current 8/20 �� s	10KA	20KA	30KA	40KA
Maximum discharge current 8/20 �� s	20kA	40kA	60kA	80kA
Limit voltage 8/20 �� s 3KA	��1.0KV
Voltage protection level UP	��1.2KV	��1.7KV	��2.2KV	��2.7KV
protected mode	L-N��N-PE��L-PE
quality	8KG	9KG	9.5KG	11KG

Phase power (integrated) box type surge protector

Product Model	MS20B-1L	MS40B-1L	MS60B-1L	MS80B-1L
Working voltage (AC)	L-N ��220V
Maximum continuous operating voltage (AC):	385V
Nominal discharge current 8/20 �� s	10KA	20KA	30KA	40KA
Maximum discharge current 8/20 �� s	20kA	40kA	60kA	80kA
Limit voltage 8/20 �� s 3KA	��1.0KV
Voltage protection level UP	��1.2KV	��1.5KV	��2KV	��2.5KV
protected mode	L-N��N-PE��L-PE
quality	4KG	5KG	5.5KG	6.2KG

MS type single-phase power box surge protector

[Overvoltage absorber]MS type three-phase power box surge protector

2026-6-13 19:31:04

Integrated power box type surge protector

The MS type three-phase power box surge protector adopts a comprehensive protection mode of common mode and differential mode, equipped with normal/deteriorated status indicator lights and optional remote signaling contacts to achieve remote monitoring with overvoltage automatic counting function. It is suitable for various power supply systems and has multiple discharge currents to choose from according to different installation environments

Product Model	MS40B	MS60B	MS80B	MS120B
Working voltage (AC)	L-N ��220V
Maximum continuous operating voltage (AC):	385V
Nominal discharge current 8/20 �� s	20KA	30KA	40KA	60KA
Maximum discharge current 8/20 �� s	40kA	60kA	80kA	120kA
Voltage protection level UP	��1.7KV	��2.2KV	��2.7KV	��3.0KV
protected mode	L-N-PE(3+1)
quality	6KG	6.5KG	7KG	8KG

Modular power box surge protector

Using Mingshi's high-quality modular products, the box is made of high-quality steel for easy testing and replacement. It is maintenance free, easy to operate, and easy to install with load overcurrent, overheating, and failure separation devices to avoid short circuits and fire accidents. The components inside the box are connected using specially designed multi-layer copper bars, with a compact structure and equipped with normal working status/fault alarms and automatic overvoltage counting. Single phase/three-phase can be selected according to different installation environments based on the power supply system. There are multiple discharge currents to choose from

Product Model	MS40	MS60	MS80	MS100
Working voltage (AC)	L-N ��220V
Maximum continuous operating voltage (AC):	385V
Nominal discharge current 8/20 �� s	20KA	30KA	40KA	50KA
Maximum discharge current 8/20 �� s	40kA	60kA	80kA	100kA
Voltage protection level UP	��1.7KV	��2.2KV	��2.7KV	��3.0KV
protected mode	L-N-PE(3+1) L-N-PE(3+1)
quality	8KG	9KG	10KG	11KG

Product Model	MS120	MS160	MS200-100A
Working voltage (AC)	L-N ��220V
Maximum continuous operating voltage (AC):	385V
Nominal discharge current 8/20 �� s	60KA	80KA	100KA
Maximum discharge current 8/20 �� s	120kA	160kA	200kA
Voltage protection level UP	��3.0KV	��4.0KV	��1.8KV
protected mode	L-N-PE(3+1)
quality	11KG	12KG	10KG
quality	11KG	12KG	Load current: 100A

MS type three-phase power box surge protector

[Overvoltage absorber]ZR-TBP-35KV Overvoltage Resistive Capacitive Absorber

2026-6-13 19:26:59

The ZR-TBP-35KV overvoltage resistance capacitance absorber not only retains the phase to phase protection function of the TBP-35KV three-phase combination lightning arrester, but also enhances the system's ability to absorb overvoltage.

[Overvoltage absorber]TBP-150 type motor (neutral point) protector

2026-6-13 19:17:46

TBP-150 motor (neutral point) protector

[Overvoltage absorber]LCG Brake lever

2026-6-13 19:13:56

LCG brake lever

[Overvoltage absorber]LH type cable sheath protector

2026-6-13 19:13:04

LH type cable sheath protector (LH)

Medium and high voltage cables are often forced to reduce their transmission capacity due to the breakdown and damage of the outer protective layer caused by the induced voltage of the metal sheath.
In order to reduce the overvoltage of the sheath to ground and avoid the breakdown of the outer protective layer, a protective layer protector is commonly used to limit the voltage and ensure the reliable operation of the cable.

The LH cable sheath protector is applied in single core power cable lines to limit the induced overvoltage on the metal sheath of the cable, ensuring that the insulation of the protective layer is not broken down by overvoltage. This product can be used in grounded cable lines and cross connected cable lines.

Typical technical parameters table of LH cable sheath protector

Product Model	System nominal voltage (kV)	10kA lightning residual voltage (kV) peak value (Not greater than)	power frequency withstand Voltage/Time (kV)/s	DC 1-minute reference voltage (kV) (Not less than)	0.75 leakage current ��A�� (Not greater than)	200 �� s square wave current capacity ��A��
LH-10-I LU��JS��-10-I	ten	six point five	3/2	three point two five	fifty	six hundred
LH-35-I LU��JS��-35-I	thirty-five	six point five	5/3	three point two five	fifty	six hundred
LH-110-I LU��JS��-110-I	one hundred and ten	ten	5/4	five point five	fifty	six hundred
LH-110-�� LU��JS��-110-��	one hundred and ten	twenty	10/4	eleven	fifty	six hundred
LH-220-�� LU��JS��-220-��	two hundred and twenty	thirty	16/3	seventeen	fifty	six hundred

Note: JS means with counter

[Overvoltage absorber]ZRC series three-phase combined resistance capacitance absorber

2026-6-13 19:12:55

Overview of ZRC series three-phase combined resistance capacitance absorber:

The specialized protective device for overvoltage caused by the opening and closing of vacuum switches is the resistance capacitance absorber (also known as RC protector). In developed countries such as the United States and Japan, the combination of vacuum switches and resistance capacitance absorbers is a common usage method. Due to the unique characteristics of China's medium voltage (3-66kV) power grid, both imported resistance and capacitance absorption devices and domestically produced resistance and capacitance absorbers produced according to foreign standards are unable to adapt to the actual situation in China, resulting in frequent unexplained damage accidents. This has resulted in the development speed of the product being far behind that of vacuum switches in China.

But after entering 2002, with the theoretical improvement of resistance capacitance protection in medium voltage systems, the key factors causing problems were identified. At present, the resistance capacitance absorbers used in domestic power grids, produced according to the principle of correct coordination, have completely eliminated the troubles of accidents, greatly improved safety, and revitalized the product with strong vitality.
This product is a high-frequency oscillation absorption device with fast response and good response to small currents, achieving ideal compatibility with vacuum discharge tubes. Not providing additional grounding capacitor current to the power grid, designed for easy use. Adopting a four-star three-phase combination connection method, it meets the actual situation of China's power grid and has strong inter phase protection capability. Dry design, safe and durable, compact and beautiful.
Purpose and execution standards:
This product is used in AC medium voltage 3-66kV power systems, inside cabinets, and is matched with vacuum switches to absorb the current interruption overvoltage and multiple reignition overvoltage generated by the opening and closing of vacuum switches. It cannot be used for lightning protection, nor can it be used for long-term absorption of high-order harmonics in the system. Parallel use with lightning arresters yields better results.
Due to the particularity of domestic medium voltage power grids, this product does not comply with relevant foreign standards. The product technical specifications are implemented in accordance with GB311.1-1997 "Insulation Coordination of High Voltage Transmission and Transformation Equipment", GB11024.1-2001 "Parallel Capacitors for Power above 1kV", and GB3667-1997 "AC Motor Capacitors" standards. For important parameter configurations not explicitly defined in the above standards, they shall be revised and implemented in accordance with DL/T620-1997 "Overvoltage Protection and Insulation Configuration of AC Electrical Equipment".

ZRC series three-phase combined resistance capacitance absorber usage conditions:
The normal usage conditions of the product are as follows:
*Environmental temperature: not higher than+40 ��, not lower than -40 ��;
*Altitude: not exceeding 1500m (above 1500m is a specialized high-altitude product)
*Power frequency: 50 ± 2Hz; 60 ± 2Hz;
*Seismic intensity: below 7 degrees;
*Maximum wind speed: 35m/s;
*The short-term power frequency voltage rise at the installation point shall not exceed the rated voltage of the absorber.

Model definition:
The ZRC series three-phase combined resistance capacitance absorber is a high-tech product with no universal definition rules. Each production enterprise defines the model according to its own product characteristics. The product model is defined as follows:

[Overvoltage absorber]TBP-6kV Indoor Overvoltage Protector

2026-6-13 19:08:50

Main technical parameters of TBP-6kV indoor overvoltage protector

Table 1

TBP-A series (electric motor type)
Rated voltage of electric motor (kV)	valid value	six point three	ten point five
Rated voltage of protector (kV)		seven point six	twelve point seven
The power frequency discharge voltage shall not be less than (kV)		fifteen	twenty-five
DC U1mA reference voltage not less than (kV)	peak	eleven point two	eighteen point six
1.2/50 �� s impulse discharge voltage not exceeding (kV)		seventeen	twenty-nine
100A operation impulse current residual voltage not exceeding (kV)		thirteen point six	twenty-three
500A lightning impulse current residual voltage not exceeding (kV)		seventeen	twenty-nine
2000 �� s square wave impulse current (A)		four hundred	four hundred
The safe net distance shall not be less than (mm)		ninety-five	one hundred and twenty
Crawling distance along the surface shall not be less than (mm)		one hundred and forty	two hundred and thirty-five
Minimum phase to phase distance (mm)		one hundred and fifteen	one hundred and forty-five

Table 2

TBP-B series (vacuum circuit breaker, switch type)
Rated voltage of the system (kV)	valid value	six	ten	thirty-five
Rated voltage of protector (kV)	valid value	seven point six	twelve point seven	forty-two
The power frequency discharge voltage shall not be less than (kV)	peak	sixteen	twenty-six	eighty
DC U1mA reference voltage not less than (kV)		fourteen point four	twenty-four	seventy-three
1.2/50 �� s impulse discharge voltage not exceeding (kV)		twenty-four	forty-one	ninety-nine
500A lightning impulse current residual voltage not exceeding (kV)		nineteen	thirty-two	one hundred and twenty-four
2000 �� s square wave impulse current (A)		four hundred	four hundred	four hundred
The safe net distance shall not be less than (mm)		ninety-five	one hundred and twenty	two hundred and eighty-five
Crawling distance along the surface shall not be less than (mm)		one hundred and forty	two hundred and thirty-five	one thousand and twenty
Minimum phase to phase distance (mm)		one hundred and fifteen	one hundred and forty-five	four hundred and seventy

Table 3

TBP-C series (capacitor type)
Rated voltage of the system (kV)	valid value	six	ten	thirty-five
Rated voltage of protector (kV)	valid value	seven point six	twelve point seven	forty-two
The power frequency discharge voltage shall not be less than (kV)	peak	sixteen	twenty-six	eighty
DC U1mA reference voltage not less than (kV)		fourteen point four	twenty-four	seventy-three
500A operation impulse current residual voltage is not significant (kV)		nineteen	thirty-two	ninety-nine
5KA lightning impulse current residual voltage not exceeding (kV)		twenty-four	forty-one	one hundred and twenty-four
2000 �� s square wave impulse current (A)		four hundred	four hundred	four hundred
The safe net distance shall not be less than (mm)		ninety-five	one hundred and twenty	two hundred and eighty-five
Crawling distance along the surface shall not be less than (mm)		one hundred and forty	two hundred and thirty-five	one thousand and twenty
Minimum phase to phase distance (mm)		one hundred and fifteen	one hundred and forty-five	four hundred and seventy

Table 4

TBP-O series (motor neutral point type)
Rated voltage of protector Effective value (kV)	Rated voltage of motor Effective value (kV)	8/20 �� s lightning impulse current residual voltage Peak value not exceeding (kV)	DC U1mA reference voltage Peak value not less than (kV)
four point eight	six point three	twelve	six point eight
eight	ten point five	nineteen	eleven point four

TBP-6kV Indoor Overvoltage Protector

[Overvoltage absorber]LGQ series resistor capacitor overvoltage absorber

2026-6-13 18:58:06

The LGQ series resistor capacitor overvoltage absorber is suitable for use as a vacuum switch supporting device in AC 50HZ, 3KV, 5KV, and 35KV high-voltage switchgear. It is used to absorb the operating overvoltage and indoor intrusion lightning impulse overvoltage waves during switch opening and closing, and to protect electrical equipment such as motors, transformers, and switches.
Normal operating conditions for the impedance capacitance absorber:
1. The altitude shall not exceed 2500m
2. The ambient air temperature should not exceed+45 �� and should not be lower than -5 ��.
3. The relative humidity of the air should not exceed 90 ��.
4. Indoor use. Vertical installation. The inclination shall not exceed 5 degrees.
5. The distortion rate of the power grid voltage should not exceed 35KV �� 3%
3KV;5KV; 10KV��4%

Execution standards:
GB311.1-1997 Insulation Coordination for High Voltage Transmission and Transformation Equipment.
CB/T11024.1~4-2001 Parallel capacitors for AC power systems with standard voltage above 1KV

The main technical parameters of the LGQ series resistor capacitor overvoltage absorber are shown in the table:

1. Capacitors are allowed to have a deviation of ± 10%
2. Tangent value of capacitor loss angle (excluding resistance) �� 0.04%
3. The allowable resistance value is ± 10%
Model and basic parameters:
The model and meaning of the resistance capacitance absorber are as follows:

Structure, external dimensions, and wiring:
Structure:
The housing of the LGQ series resistor capacitor overvoltage absorber is made of SMC material, and the capacitor is made of high-quality polypropylene film as the solid medium, sealed and filled with flame-retardant polyurethane. The product has stable and reliable performance, and is equipped with a woven non inductive resistor with good heat dissipation performance.
The external dimensions are shown in Figure 1-4, and the wiring is shown in Figure 5

Usage, Inspection, and Maintenance:
1. The impedance capacitance overvoltage absorber should be installed vertically with a slope not exceeding 5 degrees, and it is recommended to be connected near the protected equipment, as shown in Figure 5
When the impedance capacitance overvoltage absorber is out of operation, it should be fully discharged and maintenance can only be carried out when the remaining voltage is below 40V.
3. The resistor capacitor overvoltage absorber should be inspected regularly at least once a year to determine if it is functioning properly. The method of inspection is as follows:
Before putting the impedance capacitance overvoltage absorber into operation, measure its capacity value and loss tangent value with a bridge, and record the measurement frequency and results.
When inspecting the resistance capacitance absorber after power outage or discharge, the same bridge and measurement frequency should be used to measure the capacitance value and loss tangent value. If it is found that the capacitance of the 3KV, 6KV, and 10KV resistance capacitance overvoltage absorber increases by 10%, and the capacitance of the 35KV resistance capacitance overvoltage absorber increases by 3%, the loss tangent value increases by 0.1%, indicating that there is an internal fault in the capacitor and it should be replaced in a timely manner.
4. During the factory withstand voltage test of the impedance capacitance overvoltage absorber, the test voltage shall be 75% of the value specified in Table 1.
5. As this product is designed for all working conditions, it is resistant to moisture and dirt, and only requires regular surface cleaning treatment.

LGQ series resistor capacitor overvoltage absorber

[Overvoltage absorber]HD,TBP-35kV( Outdoor overvoltage protector

2026-6-13 18:37:43

Protector model	System voltage KV	Continuous operating voltage KV	Direct current (UImA) reference voltage KV not less than	Lightning impulse residual voltage KV	2000 �� S square wave impulse current (A)
HD��TBP-B-35KV	thirty-five	forty point eight	seventy-three	one hundred and thirty-four	four hundred
HD��TBP-C-35KV	thirty-five	forty point eight	seventy	one hundred and thirty-four	four hundred

HD, TBP-35kV (outdoor) overvoltage protector

[Overvoltage absorber]HD,TBP-35kV Indoor overvoltage protector

2026-6-13 18:37:34

Protector model	System voltage KV	Continuous operating voltage KV	Direct current (UImA) reference voltage KV not less than	Lightning impulse residual voltage KV	2000 �� S square wave impulse current (A)
HD��TBP-B-35KV	thirty-five	forty point eight	seventy-three	one hundred and thirty-four	four hundred
HD��TBP-C-35KV	thirty-five	forty point eight	seventy	one hundred and thirty-four	four hundred

HD, TBP-35kV (indoor) overvoltage protector

[Overvoltage absorber]HD,TBP-3~10kV Outdoor Overvoltage Protector

2026-6-13 18:37:26

Protector model	System voltage kV	Continuous operating voltage kV	DC (U1mA) reference voltage kV not less than	Lightning impulse residual voltage kV	2000us square wave impulse current (A)
HD, TBP-A type		three point two	five point seven	nine point five	four hundred
		six point three	eleven point three	nineteen	four hundred
		ten point five	eighteen point nine	thirty-one	four hundred
HD, TBP-B type	three	four	seven point five	seventeen	four hundred
	six	eight	sixteen	thirty	four hundred
	ten	thirteen point six	sixteen	thirty	four hundred
HD, TBP-C type	three	four	seven point two	thirteen point five	four hundred
	six	eight	thirteen point eight	twenty-seven	four hundred
	ten	thirteen point six	twenty-four	forty-five	four hundred
HD, TBP-O type		three point one five	three point four	six	four hundred
		six point three	six point nine	twelve	four hundred
		ten point five	eleven point three	nineteen	four hundred

HD, TBP-3~10kV (outdoor) overvoltage protector

[Overvoltage absorber]TBP Medium high voltage combined overvoltage protector

2026-6-13 18:30:18

The TBP medium and high voltage combined overvoltage protector is a product that has been researched and developed for many years, integrating the advantages of domestic and foreign peers. In the 1990s, it was launched as the smallest, lightest, best sealed, and superior overvoltage protector in China.

The three-phase combined overvoltage protector, also known as TBP, is a new type of overvoltage protector that replaces traditional lightning arresters. It can reliably protect the protected electrical equipment from phase to ground and phase to phase overvoltage, protecting the insulation of the protected equipment from damage caused by lightning and operation overvoltage. It is incomparable to ordinary zinc oxide lightning arresters.

Selection:
Users can choose corresponding overvoltage protectors according to the different protected electrical equipment, with voltage levels including 380V, 3kV, 6kV, 10kV, 35kV and other specifications and applications for users to choose from.

Structural characteristics and installation dimensions of TBP high-voltage combined overvoltage protector:
This product structure adopts a four-star connection method, and overvoltage protectors A, B, C, and D are respectively led by high-voltage cables, greatly reducing the phase to phase distance. Due to the use of a symmetrical structure, any three of them can be connected to phases A, B, and C respectively, with the other phase grounded.

6-35kV wiring diagram:
Purpose:
TBP medium and high voltage combined overvoltage protectors are mainly used in power plants and factory electrical systems to protect electrical equipment such as transformer switches, busbars, motors, generators, lines, and capacitor banks, limit atmospheric and operational overvoltages, and provide reliable protection for electrical equipment.

Main parameters of overvoltage protector: [No W for indoor type, W for outdoor type]

Product Model	protected object rated voltage kV (Effective value)	protector rated voltage kV (Effective value)	Nominal placement electric current Lower residual pressure kV	2ms square wave inrush current tolerance A	protected object	drawing number
TBP-0.5	zero point three eight	zero point five			Gas stations, electrical equipment	one
TBP-A-3.8F	three point one five	three point eight	nine point five	two hundred	electric motor	two
TBP-A-7.6F	six point three	seven point six	twenty-five	two hundred
TBP-A-12.7F	ten point five	twelve point seven	forty-one point five	two hundred
TBP-B-7.6F	six	seven point six	twenty-five	four hundred	Generator, Transformer Voltage regulator, busbar Switches and circuits
TBP-B-12.7F	ten	twelve point seven	forty-one point five	four hundred
TBP-B-42F/200	thirty-five	forty-two	one hundred and sixty	four hundred
TBP-B-42F/400WE	thirty-five	forty-two	one hundred and sixty	four hundred		three
TBP-C-3.8F	three	three point eight	nine point five	four hundred	capacitor	two
TBP-C-7.6F	six	seven point six	twenty-seven	four hundred
TBP-C-12.7F	ten	twelve point seven	forty-five	four hundred
TBP-C-42F/200	thirty-five	forty-two	one hundred and fifty	four hundred
TBP-C-42F/400WE	thirty-five	forty-two	one hundred and fifty	four hundred		three
TBP-O-4.6F	six point three	four point six	nine point five	two hundred	Neutral point of motor	two
TBP-O-7.6F	ten point five	seven point six	twenty-five	two hundred	Neutral point of motor	two

TBP medium high voltage combined overvoltage protector