Shanghai Huabang Industrial Business Network - discharge coil

[Dry discharge coil]FDGZBX8-1.7,2.5,3.4-1(W)(G) series dry discharge coil

2026-6-20 21:58:39

FDGZBX8-1.7,2.5,3.4-1 (W) (G) series dry discharge coil

[Dry discharge coil]FDZR2-4.0/12(-1W) type discharge coil

2026-6-20 21:58:30

The FDZR2-4.0/12/�� 3 (-1W) discharge coil is a fully enclosed structure made of (outdoor) epoxy resin casting, suitable for connecting with high-voltage parallel capacitors in power systems with a rated frequency of 50Hz and a rated voltage of 10kV and below. It enables the rapid release of residual charges after the capacitor bank is disconnected from the power system, effectively preventing the occurrence of closing overvoltage and overcurrent that may endanger equipment safety due to the capacitor still carrying charges when the capacitor bank is closed again, and ensuring the safety of maintenance personnel. This series of products comes with a secondary winding, which can be used for line monitoring, measurement, and secondary protection.

Technical parameters of FDZR2-4.0/12/�� 3 (-1W) discharge coil

System nominal voltage (kV)	ten
Rated voltage of primary winding (kV)	6.6/��3�� 7.2/��3�� 11/��3�� 12/��3
Rated voltage of secondary winding (V)	100�� 100/��3
Rated load of secondary winding (VA)	50VA
accuracy level	zero point five
Supporting capacitor bank capacity (Mvar)	0.5-4.0
insulation level	12/42/75kV
discharge time	At rated operating voltage, the residual voltage of the capacitor shall not drop to 50V for more than 5 seconds after power failure
Partial discharge level	��5pC
Wiring method: Reduced level	Number of phases: single-phase	Frequency: 50Hz
Creepage distance: The external insulation creepage distance shall not be less than 31mm/kV

Note: If there are special requirements, they can be determined after consultation with our company.

Product outline drawing:

FDZR2-4.0/12 (-1W) discharge coil

[Dry discharge coil]FDGE9-1W type fully enclosed outdoor dry discharge coil

2026-6-20 21:58:22

The FDGE9-1W fully enclosed outdoor dry discharge coil is an epoxy resin vacuum cast single-phase outdoor fully enclosed product, suitable for power systems with a rated frequency of 50 Hz and a rated voltage of 10kV and below. Connect in parallel with the high-voltage parallel capacitor bank, and when the capacitor bank is disconnected from the system, reduce the remaining voltage on the capacitor bank to a safe voltage within 5 seconds. During normal operation, the secondary winding can serve as a voltage indicator. If the user has special requirements, the residual voltage winding can also be included to provide relay protection.

Structural characteristics:
This type of discharge coil adopts a fully sealed structure with resin cast insulation for the iron core. The iron core is made of high-quality cold-rolled steel sheets and is cast together with the primary and secondary windings using advanced vacuum casting technology. It is an ideal product to replace oil immersed discharge coils due to its small size, light weight, small no-load capacity, strong overvoltage resistance, easy installation and use, and maintenance free.

Technical parameters:
Product execution standard: DL/T653-2006
Technical Specifications for Ordering Discharge Coils for Voltage Parallel Capacitors;
Load power factor: COS=0.8 (lag);
Surface creepage distance: greater than 300mm;

The technical parameters of FDGE9-1W fully enclosed outdoor dry discharge coil are shown in the following table:

Appearance dimensions:

FDGE9-1W fully enclosed outdoor dry discharge coil

[Dry discharge coil]FDGE35 type discharge coil

2026-6-20 21:58:13

FDGE35 discharge coil

[Dry discharge coil]FDGE11 type discharge coil

2026-6-20 21:58:05

FDGE11 type discharge coil

[Dry discharge coil]FDGE6 type semi enclosed indoor dry discharge coil

2026-6-20 21:57:56

FDGE6 semi enclosed indoor dry discharge coil

[Dry discharge coil]FDGE10 type fully enclosed indoor dry-type discharge coil

2026-6-20 21:57:48

FDGE10 fully enclosed indoor dry discharge coil

[Dry discharge coil]FDGZ(C) type fully enclosed outdoor dry discharge coil

2026-6-20 21:57:40

FDGZ (C) type fully enclosed outdoor dry discharge coil

[Dry discharge coil]FDGE9 type discharge coil

2026-6-20 21:57:30

The FDGE9 discharge coil is suitable for power systems with a rated frequency of 50Hz or 60Hz and a rated voltage of 10kV and below. It is connected in parallel with a high-voltage parallel capacitor bank. When the capacitor bank is disconnected from the system, it can reduce the remaining voltage on the capacitor bank to a safe voltage within 5 seconds. During normal operation, the secondary winding can serve as a voltage indicator. If the user has special requirements, the residual voltage winding can also be included to provide relay protection.
The product complies with the technical specifications for ordering discharge coils for voltage parallel capacitors (DL/T 653-1998).

Model and its meaning

Normal usage conditions
Installation location: Indoor.
Environmental temperature: maximum temperature of 40 ��; Minimum temperature -5 ��; The daily average temperature does not exceed 30 ��.
Atmospheric conditions: There is no severe pollution in the atmosphere.

Technical parameters of FDGE9 discharge coil

Product Model	rated voltage ratio (kV)	Accuracy level or combination of accuracy levels	rated output (VA)	discharge capacity (Mvar)	Rated insulation level (kV)
FDGE9/6.6/��3-1.7-1	6.6/��3/0.1	0.2(0.5)	20(50)	one point seven	7.2/32/60
FDGE9/6.6/��3-1.7-1	6.6/��3/0.1/0.1/3	0.2(0.5)/6P	20(50)/100
FDGE9/7.2/��3-1.7-1	7.2/��3/0.1	0.2(0.5)	20(50)
FDGE9/7.2/��3-1.7-1	7.2/��3/0.1/0.1/3	0.2(0.5)/6P	20(50)/100
FDGE9/11/��3-1.7-1	11/��3/0.1	0.2(0.5)	20(50)		12/42/75
FDGE9/11/��3-1.7-1	11/��3/0.1/0.1/3	0.2(0.5)/6P	20(50)/100
FDGE9/12/��3-1.7-1	12/��3/0.1	0.2(0.5)	20(50)
FDGE9/12/��3-1.7-1	12/��3/0.1/0.1/3	0.2(0.5)/6P	20(50)/100

Rated insulation level: 0.5/3kV

Structure and Characteristics
This series of discharge coils adopts a pillar structure and is made of fully enclosed epoxy resin casting, which is resistant to pollution and moisture. It is also suitable for use in tropical regions. The transformer does not require special maintenance, only regular cleaning of surface dirt is needed. Install a wiring terminal box at the secondary output terminal of the transformer. There is a hole on the front and side of the terminal box to match the output terminal for safe and reliable wiring. There are grounding bolts and six mounting holes for installation on the product base plate.

Outline drawing and installation dimensions

Ordering Instructions
Please provide the following parameters when placing an order:
Product model.
The rated voltage is in kV.
Accurate level combination and rated output VA.
Discharge capacity Mvar.
The altitude of the environment is m.

[Dry discharge coil]FDGE8 type discharge coil

2026-6-20 21:57:22

Overview
The FDGE8 discharge coil is suitable for power systems with a rated frequency of 50Hz or 60Hz and a rated voltage of 10kV and below. It is connected in parallel with a high-voltage parallel capacitor bank. When the capacitor bank is disconnected from the system, it can reduce the remaining voltage on the capacitor bank to a safe voltage within 5 seconds. During normal operation, the secondary winding can serve as a voltage indicator. If the user has special requirements, the residual voltage winding can also be included to provide relay protection.
The product complies with the technical specifications for ordering discharge coils for voltage parallel capacitors (DL/T 653-1998).

Model and its meaning

Normal usage conditions
Installation location: Indoor.
Environmental temperature: maximum temperature of 40 ��; Minimum temperature -5 ��; The daily average temperature does not exceed 30 ��.
Atmospheric conditions: There is no severe pollution in the atmosphere.

Technical parameters of FDGE8 discharge coil

Product Model	rated voltage ratio (kV)	Accuracy level or combination of accuracy levels	rated output (VA)	discharge capacity (Mvar)	Rated insulation level (kV)
FDGE8/6.6/��3-1.7-1	6.6/��3/0.1	0.2(0.5)	20(50)	one point seven	7.2/32/60
FDGE8/6.6/��3-1.7-1	6.6/��3/0.1/0.1/3	0.2(0.5)/6P	20(50)/100
FDGE8/7.2/��3-1.7-1	7.2/��3/0.1	0.2(0.5)	20(50)
FDGE8/7.2/��3-1.7-1	7.2/��3/0.1/0.1/3	0.2(0.5)/6P	20(50)/100
FDGE8/11/��3-1.7-1	11/��3/0.1	0.2(0.5)	20(50)		12/42/75
FDGE8/11/��3-1.7-1	11/��3/0.1/0.1/3	0.2(0.5)/6P	20(50)/100
FDGE8/12/��3-1.7-1	12/��3/0.1	0.2(0.5)	20(50)
FDGE8/12/��3-1.7-1	12/��3/0.1/0.1/3	0.2(0.5)/6P	20(50)/100

Rated insulation level: 0.5/3kV

Structure and Characteristics
This series of discharge coils is a semi enclosed epoxy casting type, with the iron core made of high-quality silicon steel sheets stacked together. The casting body contains a cylindrical concentric combination of primary and secondary coils. There are grounding bolts and four mounting holes for installation on the bottom clamp of the product.

Outline drawing and installation dimensions of FDGE8 discharge coil

Ordering Instructions
Please provide the following parameters when placing an order:
Product model.
The rated voltage is in kV.
Accurate level combination and rated output VA.
Discharge capacity Mvar.
The altitude of the environment is m.
Note: If users have special requirements, they can negotiate with our company to determine.

[Dry discharge coil]FDEG8 type discharge coil

2026-6-20 21:57:13

FDEG8 type discharge coil

[Dry discharge coil]FDGRC-20kV series outdoor dry discharge coil

2026-6-20 21:57:05

FDGRC-20kV series outdoor dry discharge coil

[Dry discharge coil]FDGR-20kV series outdoor dry discharge coil

2026-6-20 21:56:56

FDGR-20kV series outdoor dry discharge coil

[Dry discharge coil]FDGRC-35kV series outdoor dry discharge coil

2026-6-20 21:56:48

1�� Usage and Application
The FDGRC-35kV series outdoor dry-type discharge coil is a single-phase fully enclosed outdoor product used in power systems to connect with high-voltage parallel capacitors, allowing the capacitor bank to quickly release the charge after being disconnected from the power system. It is a necessary safety technical measure for parallel capacitors in substations, which can effectively prevent overvoltage and overcurrent that may endanger equipment safety when the capacitor bank is closed again due to the capacitor still carrying charge, and ensure the safety of maintenance personnel. This product comes with a secondary winding, which can be used for line monitoring, detection, and secondary protection.

2�� FDGRC-35kV series outdoor dry discharge coil model description

3�� Structure and performance characteristics
a) The product adopts an imported epoxy resin vacuum casting structure, achieving oil-free operation, completely eliminating oil leakage, environmental pollution, and other issues
Characteristics such as combustion.
b) The product structure is simple and easy to install and use.
c) The strengthened internal and external insulation provides the product with extremely high safety.
d) The maintenance of the product is simple, just wipe off the surface dust during power outage maintenance.
e) Using a special formula, the product is sturdy and reliable, with high mechanical strength, and can be used for a long time in various environments without cracking or breaking.

4�� Environmental conditions
1. Environmental temperature: -40 to 55 ° C
2. Altitude: not exceeding 2000m
3. Seismic resistance level: Under the action of an earthquake intensity of 8 degrees, it will not be damaged.
4. Installation location: No harmful gases, vapors, or conductive or explosive dust.

5�� Main technical performance indicators of FDGRC-35kV series outdoor dry discharge coil

6�� Connection method with capacitors

7�� Outline installation dimension diagram

FDGRC-35kV series outdoor dry discharge coil

[Dry discharge coil]FDGR-35kV series dry discharge coil

2026-6-20 21:56:39

Purpose and Scope of Application

After the parallel capacitor bank installed in the substation is out of operation, it must have a discharge device to release the internal charge. For the capacitor bank that implements automatic control switching, it is even more required to release its charge below the safe voltage within the specified time. Therefore, installing dedicated discharge coils is a necessary technical safety measure for parallel capacitors in substations.

Considering the safety and reliability of parallel capacitor banks and their supporting equipment during operation, it is recommended to use a widely adopted single star wiring method for capacitor banks. The discharge coils are directly connected in parallel with each phase capacitor, and the secondary windings are connected in an open triangle shape, forming an unbalanced voltage protection circuit with the protection relay as internal protection for the capacitor. If any component inside a capacitor of any phase in the capacitor bank is damaged or faulty, it is required that the unbalanced voltage protection can detect and activate the switch to promptly disconnect the capacitor bank from the power grid. At this time, the discharge coil must have a sufficiently high accuracy level to ensure the implementation of this protection performance

Structure and performance characteristics
1. The product adopts an imported epoxy resin vacuum casting structure, achieving oil-free and completely eliminating the characteristics of oil leakage, environmental pollution, and flammability.
2. The structure is simple and the installation and use are very convenient.
3. The product maintenance is simple, just wipe off the surface dust during power outage maintenance.
4. Strengthening the internal and external insulation makes the product highly safe.
5. Using a special formula, the product is sturdy and reliable, with high mechanical strength, and can be used for a long time in various environments without cracking or breaking.

Main technical parameters of FDGR-35kV series dry discharge coil

Connection method with capacitors

Ordering Notice
1. Rated voltage and frequency of the system
2. Voltage between the primary terminals of the discharge coil
3. Capacity of the capacitor matched between the primary terminals of the discharge coil
4. Secondary rated voltage, load and accuracy level of discharge coil

FDGR-35kV series dry-type discharge coil appearance and installation dimension diagram

FDGR-35kV series dry discharge coil

[Dry discharge coil]FDGZEX8 series discharge coil

2026-6-20 21:56:30

FDGZEX8 series discharge coil

[Dry discharge coil]FDGR Type 10KV Indoor Dry Discharge Coil

2026-6-20 21:56:22

FDGR type 10KV indoor discharge coil

[Dry discharge coil]FDGR type 10KV outdoor discharge coil

2026-6-20 21:56:13

FDGR type 10KV outdoor discharge coil

[Oil immersed discharge coil]FDG2 series discharge coil

2026-6-20 21:54:47

FDG2 series discharge coil

[Oil immersed discharge coil]FDE3 series discharge coil

2026-6-20 21:54:39

FDE3 series discharge coil

[Oil immersed discharge coil]FD21 series discharge coil

2026-6-20 21:54:30

FD21 series discharge coil

Main technical data, external dimensions, and weight of the 66kV FD21-W series discharge coil--

Model specifications	rated voltage ratio (kV)	Dimensions (mm) Length × Width × Height L×B×H(mm)	base center distance A1×B1(mm)	Installation diameter Ømm	Oil weight kg	Total weight kg
FD21-5×2/21×2-W	21×2/100×2	880×520×1400	400×450	twenty	eighty	three hundred

Note: All 66kV discharge coils must be equipped with isolation transformers

[Oil immersed discharge coil]FDME type discharge coil

2026-6-20 21:54:22

The FDME type discharge coil is used in AC 50Hz, 6-35kV power systems, connected in parallel with a high-voltage parallel capacitor bank, so that the residual charge of the capacitor after being cut off from the power system can be quickly discharged, and the residual voltage of the capacitor reaches the required value within the specified time.
This type of discharge coil has a secondary, rated voltage of 100V, and is used for relay protection.

structural characteristics
The FDME discharge coil adopts a fully sealed horizontal structure with reliable sealing performance, ensuring complete isolation between the insulating oil and the outside air. Its compensation method does not use an oil storage tank, but adopts an advanced structural compensation device. During operation, the discharge coil maintains a slight positive pressure inside the box (maximum<0.01Mpa, minimum>0.001Mpa). The sealing performance of each part is good, ensuring no oil leakage. It is a maintenance free product that does not require maintenance or replacement of components during its expected lifespan. The entire structure is reasonable, with excellent performance, small size, and beautiful appearance, making it your ideal choice.

Model meaning

Environmental conditions for use
1. Installation location: outdoor or indoor
2. Environmental temperature: Outdoor -40 ��~+40 ��, -25 ��~+45 ��, -5 ��~+55 ��, indoor -5 ��~+40 ��
3. Altitude: not exceeding 1000M
4. Anti pollution ability: The external insulation creepage distance shall not be less than 31mm/kV (relative to the highest voltage of the system). For heavily polluted areas, the creepage distance should be appropriately increased.
5. The installation location should be free of corrosive gases, steam, conductive or explosive dust.
6. There is no severe mechanical vibration in the installation site.
7. Maximum wind speed: 35m/s
8. Relative humidity: For indoor discharge coils, the monthly average relative humidity should not exceed 90%, and the daily average relative humidity should not exceed 95%.

connection method

Main ordering parameters
1. Product specifications and models 2. Primary and secondary rated terminal voltage
3. Accuracy level 4. Other special requirements
5. Quantity 6. Supply date

[Oil immersed discharge coil]FDZ2-10 outdoor discharge coil

2026-6-20 21:54:14

FDZ2-10 Outdoor Discharge Coil

[Oil immersed discharge coil]FDEC11,FDEC21 series discharge coil

2026-6-20 21:54:05

The FDEC11 and FDEC21 series discharge coils are used in AC 50Hz, 35kV power systems and are connected in parallel with high-voltage parallel capacitor banks. This allows the residual charge of the capacitors after being disconnected from the power system to be quickly discharged, and the residual voltage of the capacitors reaches the required value within the specified time.
The FDEC11 and FDEC21 series discharge coils have a tap in the middle and two secondary windings, both with a voltage of 100V, for voltage differential protection.

Environmental conditions for use
1. Installation location: outdoor or indoor
2. Environmental temperature: Outdoor -40 ��~+40 ��, -25 ��~+45 ��, -5 ��~+55 ��, indoor -5 ��~+40 ��
3. Altitude: not exceeding 1000M
4. Anti pollution ability: The external insulation creepage distance shall not be less than 25mm/kV (relative to the highest voltage of the system). For heavily polluted areas, the creepage distance should be appropriately increased.
5. The installation location should be free of corrosive gases, steam, conductive or explosive dust.
6. There is no severe mechanical vibration in the installation site.
7. Maximum wind speed: 35m/s
8. Relative humidity: For indoor discharge coils, the monthly average relative humidity should not exceed 90%, and the daily average relative humidity should not exceed 95%.

Structural characteristics of FDEC11 and FDEC21 series discharge coils

The FDEC11 and FDEC21 series discharge coils have two independent bodies that are not magnetically connected to each other. There are three high-voltage bushings and four low-voltage bushings on the box cover. There is a cylindrical oil storage tank on the high-pressure sleeve, and there is a valve on the oil storage tank that can be loosened during use. This type of discharge coil is fully sealed, and the oil in the tank does not come into contact with the outside air. Breathing relies on the rubber capsules in the oil storage tank. There is also an oil gauge on the oil storage tank, which shows the oil level at different temperatures.
The maximum working voltage is 1.1 times the rated terminal voltage.
Discharge time less than 5 seconds
Temperature rise: coil<55 �� (resistance method), oil level<50 �� (thermometer method)
Power frequency withstand voltage: 95kV Rated lightning impulse withstand voltage: 200kV
Accuracy level: Level 1
Rated voltage of the system: 35kV

FDEC11, FDEC21 series discharge coils

[Oil immersed discharge coil]FDEC series discharge coil

2026-6-20 21:53:57

The FDEC series discharge coil is used in AC 50Hz, 10kV power systems, connected in parallel with a high-voltage parallel capacitor bank, so that the residual charge of the capacitor after being cut off from the power system can be quickly discharged, and the residual voltage of the capacitor reaches the required value within the specified time. This type of discharge coil has a tap in the middle of the first stage and two secondary stages, both with a voltage of 100V, for voltage differential protection.

FDEC/35/�� 3-1.7 (FDEC/35/�� 3-2.5) (FDEC/35/�� 3-3.4) outdoor/oil immersed discharge coil structure introduction, model and meaning, product wiring diagram, main technical parameters, product insulation, external dimension drawing

[Oil immersed discharge coil]FDR5C-66kV Series Fully Sealed Discharge Coil

2026-6-20 21:53:48

FDR5C-66kV series fully sealed discharge coil

[Oil immersed discharge coil]FDR3-20kV Series Fully Sealed Discharge Coil

2026-6-20 21:53:40

FDR3-20kV series fully sealed discharge coil

[Oil immersed discharge coil]FDR3C-20kV Series Fully Sealed Discharge Coil

2026-6-20 21:53:31

FDR3C-20kV series fully sealed discharge coil

[Oil immersed discharge coil]FD2 series discharge coil

2026-6-20 21:53:23

Main technical data, external dimensions, and weight of the 35kV FD21 series discharge coil

Model specifications	rated voltage ratio (v/v)	Dimensions (mm) Length × Width × Height L×B×H(mm)	base center distance A1×B1(mm)	Installation diameter Ømm	Oil weight kg	total weight kg
FD2-5/35/Öthree	20207/100	650×550×1150	400×350	twenty	sixty-five	two hundred and twenty-five
FD2-5/35	35000/100	650×550×1150	400×350	twenty	sixty-five	two hundred and thirty
FD2-5/38.5/Öthree	322228/100	650×550×1150	400×350	twenty	sixty-five	two hundred and twenty-five
FD2-5/38.5	38500/100	650×550×1150	400×350	twenty	sixty-five	two hundred and thirty
FD2-5/40/Öthree	23094/100	650×600×1200	400×350	twenty	one hundred	two hundred and sixty
FD2-5/42/Öthree	24249/100	650×600×1200	400×350	twenty	one hundred	two hundred and sixty

Note: �� The discharge capacity shown in the table refers to the external dimensions of various conventional discharge capacities that are the same as those of the same voltage level

FD2 series discharge coil

[Oil immersed discharge coil]FDR3 Type 10KV Series Fully Sealed Discharge Coil

2026-6-20 21:53:14

FDR3 10KV Series Fully Sealed Discharge Coil Model Description

Purpose and Scope of Application
After the parallel capacitor group installed in the substation is out of operation, there must be a discharge device to release the internal charge. For the capacitor group that implements automatic control switching, it is even more required to release its charge below the safe voltage within the specified time. Therefore, installing a dedicated discharge coil is a necessary technical safety measure for parallel capacitors in the substation.
Considering the safety and reliability of parallel capacitor banks and their supporting equipment during operation, it is recommended to use a widely adopted single star wiring method for capacitor banks. The discharge coils are directly connected in parallel with each phase capacitor, and the secondary winding is connected in an open delta shape, which is connected to the protection relay to form an unbalanced voltage protection circuit as internal protection for the capacitor. If some components inside the capacitor are damaged or malfunctioning, it is required that the unbalanced voltage protection can detect and act on the switch to promptly disconnect the capacitor bank from the power grid. At this time, the discharge coil must have a sufficiently high accuracy level to ensure the performance and implementation of this protection.

Structure and Performance Characteristics of FDR3 10KV Series Fully Sealed Discharge Coil
1. The box adopts a fully sealed horizontal structure, vacuum dried and oiled, with reliable sealing performance, ensuring complete isolation from the outside air. Its insulation oil compensation method adopts a unique structure and advanced compensation technology. Regardless of the highest and lowest temperature of the environment during operation throughout the year, the pressure inside the box always maintains a slight positive pressure (no more than 0.005Mpa at the highest and no less than 0.001Mpa at the lowest).
2. The sealing performance of the box and ceramic sleeve is reliable, and there is no need for maintenance or replacement of parts during the expected service life, ensuring no oil leakage and explosion-proof function. It is a maintenance free product.
3. The design parameters are reasonable and the accuracy level is high [at 0.9 to 1.3 times the rated frequency and 0 to 100% of the rated secondary load (cos ��=0.8 lag) to ensure accuracy level].
4. Excellent volt ampere characteristics (within 1.9 times the rated voltage range, the iron core shows no obvious saturation trend to ensure linearity).
5. The coverage of supporting capacitors (groups) is wide, simplifying the tedious selection work in the past.

Environmental conditions for use
a. Usage conditions: outdoor and indoor, ambient temperature; Class A -40~+40 �� Class B -25~+45 �� Class C -10~+55 ��
b. Altitude not exceeding 1000m
c. Seismic resistance level: Under the action of an earthquake intensity of 8 degrees, it will be damaged.
d. Installation location: No harmful gases, vapors, or conductive or explosive dust.
e. Maximum wind speed 35m/s

Main technical parameters of FDR3 10KV series fully sealed discharge coil

Outline installation dimension diagram 1

Connection method with capacitor (group)

FDR3 10KV series fully sealed discharge coil

[Oil immersed discharge coil]FDR3C-10KV Series Fully Sealed Discharge Coil

2026-6-20 21:53:05

Application and Scope of FDR3C-10KV Series Fully Sealed Discharge Coil

Collective capacitors and parallel capacitors with large single capacity mainly rely on internal fuses to isolate faults and ensure the continued operation of capacitors due to internal component failures. Due to the unbalanced voltage of capacitors, the voltage on non fault phase capacitors and healthy components in fault phases will increase. When a single star shaped parallel capacitor group is connected to each phase capacitor using two or more series sections or a collective capacitor with a middle tap, its internal protection can also use high-sensitivity differential pressure protection. The discharge coil with a middle tap is connected to the corresponding tap of each phase capacitor to form a differential pressure protection circuit, which can act on the switch to promptly remove the capacitor from the grid when the voltage on the healthy component exceeds the allowable safe working value. The FDR3C fully sealed discharge coil is a all-weather product designed specifically for this differential pressure protection wiring method, with ideal discharge performance. And ensure its protection sensitivity requirements with its high differential pressure measurement precision.
FDR3C fully sealed discharge coil, high-voltage coil with center tap A2, suitable for parallel capacitors (groups) using differential pressure protection. A2 is connected to the corresponding middle terminal of the capacitor (group), and its voltage corresponds to 50% of the voltage of A1 and X at the middle tap of the parallel capacitor (note: other corresponding values can also be designed according to user requirements, such as the voltage ratio of A1, A2, X being 4:6 or 6:4 or other values).

Structure and performance characteristics
a. The FDR3C outdoor dry discharge coil adopts two independent new high-quality iron cores, a fully insulated structure, and each has a secondary coil. The structure is reasonable, the power consumption is low, the temperature rise is low, and the accuracy requirements of differential pressure protection are ensured.
b�� The fuel tank adopts a fully sealed horizontal structure, vacuum dried oil injection, reliable sealing performance, and ensures complete isolation from the outside air. Its insulation oil compensation method adopts advanced compensation technology with a unique structure. Regardless of whether it operates at the highest or lowest temperature of the environment throughout the year, the pressure inside the tank always maintains a slight positive pressure (no more than 0.005Mpa at the highest and no less than 0.001Mpa at the lowest).
c�� The sealing performance of the horizontal fuel tank body and ceramic sleeve is reliable, and there is no need for maintenance or replacement of components during the expected service life, ensuring no oil leakage and explosion-proof function. It is a maintenance free product.

Main technical parameters of FDR3C-10KV series fully sealed discharge coil

Environmental conditions for the use of FDR3C-10KV series fully sealed discharge coils

a. Usage conditions: outdoor and indoor, ambient temperature;
Class A -40~+40 ��
Class B -25~+45 ��
Class C -10~+55 ��

b. Altitude not exceeding 1000m
c. Seismic resistance level: Under the action of an earthquake intensity of 8 degrees, it will be damaged.
d. Installation location: No harmful gases, vapors, or conductive or explosive dust.
e. Maximum wind speed 35m/s

Connection method with capacitor (group)

Exterior installation dimensions

FDR3C-10KV series fully sealed discharge coil

[Oil immersed discharge coil]FDR5-66kV Series Fully Sealed Discharge Coil

2026-6-20 21:52:57

Application and Scope of FDR5-66kV Series Fully Sealed Discharge Coil

After the parallel capacitor bank installed in the substation is out of operation, it must have a discharge device to release the internal charge. For the capacitor bank that implements automatic control switching, it is even more required to release its charge below the safe voltage within the specified time. Therefore, installing dedicated discharge coils is a necessary technical safety measure for parallel capacitors in substations.

Considering the safety and reliability of parallel capacitor banks and their supporting equipment during operation, it is recommended to use a widely adopted single star wiring method for capacitor banks. The discharge coils are directly connected in parallel with each phase capacitor, and the secondary windings are connected in an open triangle shape, forming an unbalanced voltage protection circuit with the protection relay as internal protection for the capacitor. If any component inside a capacitor of any phase in the capacitor bank is damaged or faulty, it is required that the unbalanced voltage protection can detect and activate the switch to promptly disconnect the capacitor bank from the power grid. At this time, the discharge coil must have a sufficiently high accuracy level to ensure the implementation of this protection performance.

Structure and performance characteristics
1. The box adopts a fully sealed horizontal structure with vacuum drying and oil injection, ensuring reliable sealing performance and complete isolation from the outside world. Its insulation oil compensation method adopts a unique structure and advanced compensation technology. Regardless of whether it operates at the highest or lowest temperature of the environment throughout the year, the pressure inside the box always maintains a slight positive pressure (no more than 0.005Mpa at the highest and no less than 0.001Mpa at the lowest)
2. The sealing performance of the box and ceramic sleeve is reliable, and there is no need for maintenance or replacement of parts within the expected service life, ensuring no oil leakage and explosion-proof function. It is a maintenance free product.
3. Reasonable design parameters, high accuracy level [at rated frequency 0.9 times -1.3 times rated voltage and 0-100% rating]
Fixed secondary load (COS with 0.8 lag) to ensure accuracy level.
4. Excellent volt ampere characteristics (within 1.5 times the rated voltage range, the iron core shows no obvious saturation trend, ensuring reliability)
Linear degree).
5. The coverage of supporting capacitors (groups) is wide, simplifying the tedious selection work in the past

Main technical parameters of FDR5-66kV series fully sealed discharge coil

Environmental conditions for use
a�� Usage conditions: indoor and outdoor, ambient temperature;
Class A -40 to+40 ° C
Class B -25 to+45 ° C
Class C -10 to+55 ° C
b�� Altitude not exceeding 1000m;
C�� Seismic resistance level: Under the action of an earthquake intensity of 8 degrees, it will not be damaged;
d�� Installation location: No harmful gases, vapors, or conductive or explosive dust;
e�� Maximum wind speed: 35m/s.

Connection method with capacitor (group)

Outline and installation dimension diagram

FDR5-66kV series fully sealed discharge coil

[Oil immersed discharge coil]FDR3 type 35kV outdoor discharge coil

2026-6-20 21:52:49

Fully sealed discharge coil for high-voltage parallel capacitors

FDR3 (35KV) series fully sealed discharge coil, overview of applicability, structure, performance, and characteristics

Model Description

Purpose and Scope of Application
After the FDR3 type 35kV outdoor discharge coil is installed in the parallel capacitor bank of the substation, there must be a discharge device to release the internal charge. For the capacitor bank that implements automatic control switching, it is even more required to release its charge below the safe voltage within the specified time. Therefore, installing a dedicated discharge coil is a necessary technical safety measure for parallel capacitors in the substation.
Considering the safety and reliability of parallel capacitor banks and their supporting equipment during operation, it is recommended to use a widely adopted single star wiring method for capacitor banks. The discharge coils are directly connected in parallel with each phase capacitor, and the secondary winding is connected in an open delta shape, which is connected to the protection relay to form an unbalanced voltage protection circuit as internal protection for the capacitor. If some components inside the capacitor are damaged or malfunctioning, it is required that the unbalanced voltage protection can detect and act on the switch to promptly disconnect the capacitor bank from the power grid. At this time, the discharge coil must have a sufficiently high accuracy level to ensure the performance and implementation of this protection.
Structure and performance characteristics
1. The box adopts a fully sealed horizontal structure, vacuum dried and oiled, with reliable sealing performance, ensuring complete isolation from the outside air. Its insulation oil compensation method adopts a unique structure and advanced compensation technology. Regardless of the highest and lowest temperature of the environment during operation throughout the year, the pressure inside the box always maintains a slight positive pressure (no more than 0.005Mpa at the highest and no less than 0.001Mpa at the lowest).
2. The sealing performance of the box and ceramic sleeve is reliable, and there is no need for maintenance or replacement of parts during the expected service life, ensuring no oil leakage and explosion-proof function. It is a maintenance free product.
3. The design parameters are reasonable and the accuracy level is high [at 0.9 to 1.3 times the rated frequency and 0 to 100% of the rated secondary load (cos ��=0.8 lag) to ensure accuracy level].
4. Excellent volt ampere characteristics (within 1.9 times the rated voltage range, the iron core shows no obvious saturation trend to ensure linearity).
5. The coverage of supporting capacitors (groups) is wide, simplifying the tedious selection work in the past.
Environmental conditions for use
a. Usage conditions: outdoor and indoor, ambient temperature;
Class A -40~+40 ��
Class B -25~+45 ��
Class C -10~+55 ��
b. Altitude not exceeding 1000m
c. Seismic resistance level: Under the action of an earthquake intensity of 8 degrees, it will be damaged.
d. Installation location: No harmful gases, vapors, or conductive or explosive dust.
e. Maximum wind speed 35m/s

Main technical parameters of FDR3 35kV outdoor discharge coil

Connection method with capacitor (group)

Outline installation dimension diagram

FDR3 type 35kV outdoor discharge coil

[Oil immersed discharge coil]FDR3C-35kV type outdoor discharge coil

2026-6-20 21:52:40

Purpose and Scope of Application
Collective capacitors and parallel capacitors with large single capacity mainly rely on internal fuses to isolate faults and ensure the continued operation of capacitors due to internal component failures. Due to the unbalanced voltage of capacitors, the voltage on non fault phase capacitors and healthy components in fault phases will increase. When a single star shaped parallel capacitor group is connected to each phase capacitor using two or more series sections or a collective capacitor with a middle tap, its internal protection can also use high-sensitivity differential pressure protection. The discharge coil with a middle tap is connected to the corresponding tap of each phase capacitor to form a differential pressure protection circuit, which can act on the switch to promptly remove the capacitor from the grid when the voltage on the healthy component exceeds the allowable safe working value. The FDR3C fully sealed discharge coil is a all-weather product designed specifically for this differential pressure protection wiring method, with ideal discharge performance. And ensure its protection sensitivity requirements with its high differential pressure measurement precision.
FDR3C fully sealed discharge coil, high-voltage coil with center tap A2, suitable for parallel capacitors (groups) using differential pressure protection. A2 is connected to the corresponding middle terminal of the capacitor (group), and its voltage corresponds to 50% of the voltage of A1 and X at the middle tap of the parallel capacitor (note: other corresponding values can also be designed according to user requirements, such as the voltage ratio of A1, A2, X being 4:6 or 6:4 or other values).

Structure and performance characteristics
a. The FDR3C fully sealed discharge coil adopts two independent high-quality iron cores, a fully insulated structure, and each has a secondary coil. The structure is reasonable, the power consumption is low, the temperature rise is low, and the accuracy requirements of differential pressure protection are ensured.
b�� The fuel tank adopts a fully sealed horizontal structure, vacuum dried oil injection, reliable sealing performance, and ensures complete isolation from the outside air. Its insulation oil compensation method adopts advanced compensation technology with a unique structure. Regardless of whether it operates at the highest or lowest temperature of the environment throughout the year, the pressure inside the tank always maintains a slight positive pressure (no more than 0.005Mpa at the highest and no less than 0.001Mpa at the lowest).
c�� The sealing performance of the horizontal fuel tank body and ceramic sleeve is reliable, and there is no need for maintenance or replacement of components during the expected service life, ensuring no oil leakage and explosion-proof function. It is a maintenance free product.

Main technical parameters of FDR3C-35kV outdoor discharge coil

Environmental conditions for use
a. Usage conditions: outdoor and indoor, ambient temperature;
Class A -40~+40 ��
Class B -25~+45 ��
Class C -10~+55 ��
b. Altitude not exceeding 1000m
c. Seismic resistance level: Under the action of an earthquake intensity of 8 degrees, it will be damaged.
d. Installation location: No harmful gases, vapors, or conductive or explosive dust.
e. Maximum wind speed 35m/s

Connection method with capacitor (group)

Outline installation dimension diagram

FDR3C-35kV outdoor discharge coil

[Oil immersed discharge coil]FDZR-1.7 type discharge coil

2026-6-20 21:52:32

FDZR-1.7 discharge coil