Shanghai Huabang Industrial Business Network - Power direction relay

[Power direction relay]NGJ-I Reverse power relay

2026-6-14 10:32:00

The NGJ-1 reverse power relay is one of the important protective components in ship power stations. The NGJ-1 reverse power relay is the latest generation product in China, with a beautiful appearance, complete functions, easy adjustment, self checking function, light weight, small size, stable and reliable quality, and technical performance that meets the relevant requirements of CCS specifications. It is an ideal choice for design, manufacturing, and use departments.

Technical parameters:
1. The device can operate normally within the range of ± 10% of the rated voltage and ± 5% of the rated frequency when the grid voltage changes.
2. Reverse power relay power supply:
100V 50HZ/60HZ AC two-phase power consumption 2VA
Rated input current 5A AC two-phase power consumption 1A
3. When the reverse power value of the parallel operating units reaches 3-15% of the rated value (continuously adjustable), there will be a delay of 3-10
Seconds (continuously adjustable), reverse power relay action.
4. Reverse power relay load capacity:
10A 240V AC200MA 250V DC (resistive load)
10A 28V DC (resistive load)
5. Environmental conditions:
The ambient temperature ranges from 0 to+55 ��
The relative humidity is 95%.
There are impact vibrations, salt spray, and oil mist.
6. Dimensions: 150 × 105 × 67
Installation size: 14 × 95 4- �� 5

[Power direction relay]APR-3 type anti reverse relay

2026-6-13 19:27:17

Category		Prevent reverse relay
model		APR-3
Size		50H×40W×57.5D
Installation and its base	Exposed type (- N)	PF083A PF085A
	Embedded type (- Y)	P3G-08 US-08
Functional characteristics		To prevent the reverse operation of three-phase induction motors, a surge absorber is added within 220V to prevent excessive voltage, which can effectively protect the load
rated voltage		AC(V):220,240,380,415,440,50/60Hz
Indicator light action		-
Output contact	model	APR-3
	time-limited 1C	10A
lifespan	mechanical	5×106 times
	electricity	105 times
Setting error		-
Return time		-
power consumption		2VA
Using ambient temperature		-10�桫+55��
Utilize the surrounding humidity		48��85%RH
weight		ninety

APR-3 type anti reverse relay wiring diagram and timing diagram APR-3

Dimensions (APR-3)

APR-3 type anti reverse relay

[Power direction relay]BG-10B type power direction relay

2026-6-13 18:49:13

BG-10B power direction relay

[Power direction relay]LG-11,LG-12 type power direction relay

2026-6-13 18:35:58

1 Purpose
LG-11 and LG-12 power direction relays are used as power direction discrimination elements in direction protection, with LG-11 used for phase to phase short circuit protection and LG-12 used for ground short circuit protection.

2 Structure and principle
The relay adopts a plug-in structure, and the same core can be used for general embedded A32K. The principle circuit diagram of the relay is shown in Figure 5 and Figure 6, and the appearance and installation dimensions are shown in Figure 7.
The relay is constructed based on the principle of rectification, and the absolute value of the comprehensive current and voltage is compared. Its operating mode is as follows:
For LG-11 type: | IZ+K1U |>| IZ-K1U | (1)
For LG-12 type: | IOZ+KOUO |>| IOZ - KOUO | (2)
In the formula, Z is the transfer impedance of the reactive transformer DKB
That is, Z=| secondary voltage of DKB |/| primary voltage of DKB | * e ^ ia (3)
K1 is the voltage circuit conversion coefficient for LG-11B, and K2 is the voltage circuit conversion coefficient for LG-12B.
K1=| Secondary voltage of YB |/| Voltage at relay terminals | * e ^ i �� (4)
K0=| Secondary voltage of YB0 |/| Relay terminal voltage | (5)
In equation (3), �� represents the transfer angle of the DKB secondary voltage to the primary current, and in equation (4), �� represents the transfer angle of the voltage converter. Due to the use of a resonant circuit in the LG-11B model, when the voltage resonates, the angle is 90 °, while in the LG-12B model, the voltage circuit uses a transformer, so there is no angle change, that is, KO is the change of the transformer.
In equation (3), �� represents the transfer angle of the DKB secondary voltage to the primary current, and in equation (4), �� represents the transfer angle of the voltage converter. Due to the use of a resonant circuit in the LG-11B model, when the voltage resonates, the angle is 90 °, while in the LG-12B model, the voltage circuit uses a transformer, so there is no angle change, that is, KO is the change of the transformer.
The first term in equations (1) and (2) is the operating voltage, and the second term is the braking voltage. When the operating voltage is greater than the braking voltage, the relay operates. When the braking voltage is greater than the operating voltage, the relay brakes. When the operating voltage is equal to the braking voltage, it becomes a boundary condition.

Figure 1 LG-11 action boundary

Figure 2 LG-12 Action Boundary

From Figure 1 and Figure 2, it can be seen that the action boundary is a straight line perpendicular to IZ (IOZ) through the origin, which satisfies the following condition on the boundary:
For LG-11 | IZ+K1U |>| IZ-K1U | (6)
For LG-12 | IOZ+KOUO |>| IOZ - KOUO | (7)
The current circuit of the relay flows through the primary winding of the reactive transformer DKB, and the voltage obtained on the two secondary windings is applied to the working circuit and the braking circuit respectively. In parallel with another secondary winding, there is a resistor, and changing the value of the resistor can change the transfer impedance angle. For the LG-11 type, the sensitivity of the relay can be changed to -30 ° or -45 ° by connecting the HP switch in parallel with R3 or R4. For the LG-12 type, the sensitivity angle can be increased to+70 ° by connecting R3 in parallel.
The voltage circuit of the LG-11 type adopts a resonant circuit, which has two main functions: firstly, to obtain voltage on the inductor through the resonant circuit and phase shift the voltage by 90 °; secondly, when there is a three-phase fault in the positive direction at the protection installation site, relying on the memory function of the resonant circuit to ensure the reliable operation of the relay and eliminate the voltage dead zone. Due to the adjustment of the transfer angle of DKB at 60 ° or 45 °, and the transfer contact of the voltage circuit at 90 °, the sensitivity angle of the relay is obtained as -30 ° or -45 °.

Figure 1 LG-11B Vector Diagram

Figure 2 LG-12B Vector Diagram

The resonance tuning of the voltage circuit can be achieved by changing the number of turns of the winding. The resonance winding has three taps to choose from: 6, 7, and 8, and can also add or subtract 9 or 10 small windings to achieve resonance.
The comparison circuit adopts the circulating current method. The working voltage and braking voltage are rectified and filtered by C2 and C3, respectively, and then compared by R5, R6, R7, and R8 to drive the polarization relay JJ to operate. The LG-12 type uses the equal voltage method comparison circuit. The working voltage and braking voltage are rectified and obtained on R4, R7, respectively. After filtering by C2 and C3, the voltage is compared to drive the polarization relay JJ to operate.
The creep adjustment of the relay is carried out by adjusting R1 and R2. R2 is used to adjust the current balance, and R1 is used to adjust the voltage balance. After repeated adjustments, it is possible to achieve no creep in both current and voltage.
The contacts of the polarized relay are connected to an arc extinguishing circuit with a 0.22 �� capacitor and a 510 �� resistor to increase the arc breaking ability of the contacts.

Technical data of 3 LG-11 and LG-12 power direction relays
3.1 Rated data
Rated current: 5A or 1A.
Rated voltage: 100V.
Rated frequency: 50Hz.
3.2 Sensitivity angle of relay: LG-11 type, -30 ° or -45 °, LG-12 type+70 °; The error of the sensitive angle is ± 5 °.
When the rated current is applied at a small sensitive angle, the operating voltage of the relay shall not exceed 2V.
3.4 Return coefficient: The ratio of the return voltage to the operating voltage of the relay shall not be less than 0.45.
3.5 Action time: For the LG-11 type, when the voltage suddenly drops by 4 times the rated minimum action voltage and the current rises from 0 to the rated current at the sensitive angle, the action time is not more than 30mS; for the LG-12 type, when the rated current and 4 times the minimum action voltage are suddenly added at the sensitive angle, the action time is not more than 40mS.
3.6 Memory time: For the LG-11 type, when the simulated protection outlet is short circuited at the sensitive angle, and the voltage suddenly drops from 100V to 0 at rated current and 10 times rated current, the relay should reliably operate, and its polarization relay action holding time should not be less than 50mS.
3.7 Power consumption: The current circuit shall not exceed 6VA, and the voltage circuit shall not exceed 20VA.
3.8 Relays can withstand 1.1 times the rated voltage and current for a long time.
When the voltage is not greater than 220V and the current is not greater than lA, the contact can disconnect a DC inductive load (time constant not greater than 5 × 10-3s) of 20W.
The insulation resistance between the relay circuit and the casing shall not be less than 10M �� at a temperature of+40 �� and a relative humidity of 85%.
3.11 The insulation strength of the relay should withstand a withstand voltage test of 2kV at 50Hz for 1 minute without breakdown or flashover.

Figure 5 Principle circuit of LG-11B power direction relay

Figure 6 Schematic circuit diagram of LG-12 power direction relay

Figure 7: Outline and Installation Dimensions of LG-11 12 Power Direction Relay

4. Use and maintenance
Before use, the relay should first be checked for any damage during transportation. Mechanical inspection should be carried out to ensure that all screws are tightened and all welding points are secure and reliable. Then, the polarized relay should be checked. Polarized relays (2) - (3) should be short circuited, and current should be applied to (1) and (4), with (4) being of positive polarity. The operating current should not exceed 1mA, the return coefficient should not be less than 0.5, and the contact gap should not be less than 0.2mm. If any non-compliance is found, the left stop screw can be adjusted to change the operating current value, and the right stop screw can be adjusted to change the return current value. If the adjustment of the stop screw does not meet the requirements, it is allowed to move the porcelain seat position to adjust until the requirements are met.
After adjusting the polarization relay, plug it in and perform an electrical performance check. First, perform a creep check. The voltage circuit is short circuited by 20 ��, and the current circuit is connected to the rated current. Measure the voltage on the polarization relay coil, i.e. terminals (9) and (10), and adjust R1 to make the voltage zero. Then apply a voltage of 100V to the voltage circuit and open the current circuit to measure the voltage of the polarization relay coil. Adjust R2 to zero and repeatedly adjust the voltage and current creep to make the voltage of the graded relay coil zero. Then suddenly add or remove 10 times the rated current or 100V voltage under the above conditions. There should be no bird pecking phenomenon at the relay contacts. If bird pecking phenomenon is found at the contacts when cutting off high current or 100V voltage, the comparison circuit resistor or capacitor can be replaced to ensure that the discharge time constant of the braking circuit capacitor is not less than that of the working circuit capacitor. After replacement, the submersible adjustment should be carried out again. After the submersible adjustment is completed, the potentiometer brake nut should be locked, and then the sensitivity angle, sensitivity, and return coefficient of the relay should be checked to meet the technical requirements. For the LG-11 type, if the sensitivity angle exceeds the tolerance, the voltage resonance circuit should be checked for imbalance. When a voltage of 100V is applied, Uc-UL=10-15V should be met. This can be achieved by changing the inductance tap and adding or removing a small winding. At the same time, a memory characteristic test should be conducted. When a short circuit is simulated at the outlet, the voltage suddenly drops from 100V to zero, and the current is not more than 0.2 times the rated current, the relay should reliably operate. Then, a transient check should be conducted. At the reverse direction of the maximum sensitivity angle, when 10 times the rated current is suddenly applied and the 100V voltage suddenly drops to zero, the relay should have no bird pecking phenomenon.

5 Ordering Instructions
5.1 Product model and name.
5.2 Rated current.
5.3 Order quantity.

[Power direction relay]BG-12,13B type power direction relay

2026-6-13 18:33:16

Purpose:
This relay is used in power system directional protection wiring as a power directional component. BG-12B relay is used for phase to phase short circuit protection. BG-13B relay is used for grounding protection.

Working Principle:
2.1 The block diagram is shown in Figure 1.
2.2 Action principle
Comparison circuit: constructed using the principle of absolute value comparison, the working circuit is composed of transformer YB1 and rectifier bridges D1-D4, and the braking circuit is composed of transformer YB2 and rectifier bridges D5-D6. The primary of transformers YB1 and YB2 are connected to currents IY and IL, respectively. Due to the same polarity series connection of the voltage winding of YB1 and the voltage winding of YB2, the current winding of YB1 and the current winding of YB2 are connected in reverse polarity series (as shown in Figure 2). Transformer YB1 is rectified by rectifiers D1-D4 and D5-D8, and then compared. The vector diagram is shown in Figure 3, and the phase difference between IL and IY is:
When -90. < o < 90�� When IY,+IL,>IY, - IL, the relay acts.
When 90. �� o �� 270�� When IY,+IL, �� IY, - IL, the relay does not operate.
This comparison circuit has the highest sensitivity when the currents IY and IL are in phase, so the maximum sensitivity is 0. IY is the current in the voltage coil, in order to achieve the maximum sensitive angle between the required protection voltage and current (phase protection is -45, -30, ground protection+70), a phase shifting circuit needs to be added outside the voltage coil to make the current IY differ from the voltage UY that generates it by an appropriate phase. The phase shift circuit and vector diagram are shown in Figures 4 (a) and 4 (b).
Filter circuit:
Using LC and a "T" - shaped filtering circuit, the signal output by the comparison circuit is pulsating DC. After passing through the LC filtering circuit, the DC signal is given to the trigger circuit;
Trigger circuit:
A collector base coupled monostable trigger consisting of two transistors, with an output component of a reed relay as shown in Figure 6.
When there is no signal input, transistor BG1 conducts, capacitor C4 is not charged, regulator WY3 is turned off, transistor BG2 is turned off, capacitor C4 is charged, regulator WY3 breaks down, transistor BG2 conducts, the output component operates, and D13 lights up. In order to eliminate contact jitter and protect transistor BG2, an RC circuit is connected in parallel at both ends of the relay coil.
The BG-12 and 13b power direction relays are of the protruding plug-in type (T) structure with a transparent housing.
The triggering circuit diagram of BG-12 and 13b power direction relays is shown in Figure 5.
The appearance and installation dimensions of the BG-12 and 13b power direction relays are shown in Figure 4 of the universal structural system.

Main technical parameters:
3.1 AC rated value: 110V, 50Hz.
3.2 AC rated current: 5A, 1A.
3.3 DC rated voltage: 220V, 110V, 48V.
3.4 Power consumption: The AC voltage circuit shall not exceed 3VA, the AC current circuit shall not exceed 1VA, the DC 220V shall not exceed 6W, the 110V shall not exceed 4W, and the 48V shall not exceed 2W.
3.5 Contact performance: The contact breaking capacity of the DC inductive circuit relay with a voltage not exceeding 250V, current not exceeding 0.5A, and time constant of 5 ± 0.75ms is 20W, and the electrical life is 104 times.
3.6 Maximum sensitivity angle of relay, at rated value: BG-12B type -30 °± 5 °, -45 °± 5 °; BG-13B type+70 °± 5 °.
3.7 Relays should not exhibit current creep when subjected to 0-10 times the rated DC voltage and voltage creep when subjected to 1.1 times the rated AC voltage.
3.8 At the maximum sensitivity angle and rated current, the minimum operating voltage of the relay shall not exceed 1V.
When the DC rated voltage is separately connected or disconnected, the relay should not malfunction. When the rated voltage of 220V and 110V DC varies within the range of 80-110% of the rated value, or when the rated voltage of 48V DC varies within the range of 90-110% of the rated value, the relay can work normally.
3.10 Action time: When the maximum sensitivity angle is 4 times the action power (rated voltage of 4V), the relay action time shall not exceed 0.03s.

Ordering instructions:
Please indicate the product model, name, and quantity.

[Power direction relay]JG-15 type power direction relay

2026-6-13 18:31:38

Purpose:

JG-15 type power directional relay includes: JG-15A type zero sequence power directional relay; JG-15B phase to phase power directional relay. JG-15A type is used as a zero sequence directional element for transformer grounding protection in high current grounding systems. Reflect the direction of zero sequence current during ground short circuit. JG-15B type is used as a directional component for phase to phase short circuits, reflecting the direction of short-circuit current during phase to phase short circuits and wired at 90 °.

Working Principle:
The JG-15 power direction relay is constructed using the phase comparison principle. The phase comparison element measures the polarity overlap time t of two electrical quantities, that is, the phase angle difference ��, ��=180 ° -18 ° t, t is ms. The operating condition is t �� 5ms, that is, �� 90 °.

Main technical parameters:
4.1 Rated AC voltage 100V; Rated AC voltage 1A, 5A; Frequency 50Hz.
4.2 Maximum sensitivity angle: Test JG-15A: -105 °± 3 ° at rated AC voltage and current; JG-15B: -45 °± 3 °.
4.3 The range of motion shall not be less than 170 °.
4.4 Minimum operating voltage �� 400mV.
4.5 Minimum operating current �� 5% rated AC current.
4.6 Action time �� 30ms.
4.7 Return time �� 50ms.
4.8 Overload Capacity
AC voltage circuit: capable of continuous operation at 1.2 times the rated voltage. AC current circuit: capable of continuous operation at twice the rated current;
10 times the rated current can operate continuously for 10 seconds
40 times the rated current can operate continuously for 1 second.
4.9 Auxiliary DC power supply: 110V or 220V.
4.10 Power consumption
AC voltage circuit: �� 1VA at rated voltage of 100V.
AC current circuit: �� 1VA at rated current of 5A
�� 0.5VA at rated current of 1A.
DC voltage circuit: 110V<3W, 220V<3W.
4.11 Environmental temperature: -10 �� -50 ��.
4.12 Dielectric Strength Relay: Each conductive circuit of the relay should be able to withstand an AC test voltage of 2kV (effective value) and 50Hz between exposed non charged metal parts and casings, as well as between input circuits and contacts, for a duration of 1 minute without insulation breakdown or flashover.
4.13 Working conditions
a) The usage location does not allow explosive media, and the surrounding media should not contain corrosive metals, gases that damage insulation, or conductive media. It is not allowed to be filled with water vapor or have serious mold presence;
b) Strong vibrations and impacts are not allowed in the usage location;
c) The usage location should have facilities to defend against rain, snow, wind, and sand;
d) The usage location does not allow an external magnetic induction intensity exceeding 1.5mT.
4.14 Electrical anti-interference relays shall comply with GB7261 and GB6261 "Electrical anti-interference tests for static relays and protective devices".

Wiring diagram behind the relay:

JG-15 power direction relay external dimensions and opening dimensions:
Refer to Figures 2 and 6 in the protruding modular insertion structure.

Ordering instructions:
6.1 Product model, name, structural form, etc.
6.2 Order Quantity.
6.3 Relay matching: such as base, socket, etc. (must be ordered separately).