Three-phase circuit breaker control circuit

Abstract

The utility model relates to the technical field of circuit breakers, in particular to a three-phase circuit breaker control circuit. Comprising a first control power supply, a second control power supply, a gas density meter and a circuit breaker on-off handle, the first control power supply comprises a first anode and a first cathode; the second control power supply comprises a second anode and a second cathode; the first positive electrode is connected with a third port and a first port of the gas density meter, a fourth port of the gas density meter is connected with one end of a coil of the second relay, the other end of the coil of the second relay is connected with the first negative electrode, a second port of the gas density meter is connected with one end of a coil of the third relay, and the other end of the coil of the third relay is connected with the first negative electrode. The second positive electrode is connected with a fifth port of the gas density meter. Compared with the prior art, low-pressure locking can be effectively achieved through the gas density meter, re-action is prevented through the loop design of the change-over switch, the structure is simple, convenience and flexibility are achieved, the number of components is small, the working efficiency of testers is improved, and cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a three-phase circuit breaker control circuit. Background Art

[0002] Currently, State Grid design requirements dictate that domestic high, medium, and low voltage transmission and transformation equipment must be designed to include circuit breaker secondary circuits for closing, primary and secondary opening, anti-tripping circuits, pressure restart monitoring circuits, and low-pressure alarm signals. Current circuit breaker secondary circuits offer these functions, but each requires corresponding components. Summary of the Invention

[0003] The utility model provides a three-phase circuit breaker control circuit to overcome the deficiencies of the prior art.

[0004] In order to achieve the above purpose, a three-phase circuit breaker control circuit is designed, including a first control power supply, a second control power supply, a gas density meter, and a circuit breaker opening and closing handle; the first control power supply includes a first positive electrode and a first negative electrode, and the second control power supply includes a second positive electrode and a second negative electrode; the first positive electrode is connected to the third port and the first port of the gas density meter, the fourth port of the gas density meter is connected to one end of the coil of the relay two, and the other end of the coil of the relay two is connected to the first negative electrode, the second port of the gas density meter is connected to one end of the coil of the relay three, and the other end of the coil of the relay three is connected to the first negative electrode, and the second positive electrode is connected to the gas density meter. The No. 5 port of the meter and the No. 6 port of the gas density meter are connected to one end of the coil of relay No. 4, and the other end of the coil of relay No. 4 is connected to the second negative pole; the No. 1 port of the circuit breaker on / off handle is connected to the first positive pole, the No. 2 port of the circuit breaker on / off handle is connected to the No. 3 port of the auxiliary switch No. 1 and the No. 13 and No. 21 ports of relay No. 1, the No. 4 port of the auxiliary switch No. 1 and the No. 14 port of relay No. 1 are connected to one end of the coil of relay No. 1, and the other end of the coil of relay No. 1 is connected to the first negative pole, the No. 22 port of relay No. 1 is connected to the No. 111 port of the auxiliary switch No. 1, and the No. 112 port of the auxiliary switch No. 1 is connected to the closing One end of the gate coil and the other end of the closing coil are connected to the first negative pole after passing through the normally closed contact of relay 2. The contact between the No. 13 port and the No. 14 port of relay 1 is a normally open contact, and the contact between the No. 21 port and the No. 22 port of relay 1 is a normally closed contact; the No. 3 port of the circuit breaker closing / opening handle is connected to the first positive pole, the No. 4 port of the circuit breaker closing / opening handle is connected to the No. 103 port of the auxiliary switch 2, the No. 104 port of the auxiliary switch 2 is connected to one end of the opening coil 1, and the other end of the opening coil 1 is connected to the first negative pole after passing through the normally closed contact of circuit breaker 2; the No. 7 port of the circuit breaker closing / opening handle is connected to the No. 2 The positive pole, the No. 8 port of the circuit breaker closing / opening handle is connected to the No. 13 port of the auxiliary switch 2, the No. 14 port of the auxiliary switch 2 is connected to one end of the opening coil 2, and the other end of the opening coil 2 is connected to the second negative pole after passing through the normally closed contact of the relay 4; when the circuit breaker closing / opening handle is closed, the contact between the No. 1 port and the No. 2 port of the circuit breaker closing / opening handle is closed, and the contact between the No. 3 port and the No. 4 port and the contact between the No. 7 port and the No. 8 port is disconnected; when the circuit breaker is opened, the No. 1 port and the No. 2 port of the circuit breaker closing / opening handle are disconnected, and the contact between the No. 3 port and the No. 4 port and the contact between the No. 7 port and the No. 8 port are closed;Auxiliary switches 1 and 2 are connected to the internal mechanism of the circuit breaker. When the circuit breaker is in the open position, the contact between terminals 111 and 112 of auxiliary switch 1 changes from normally open to normally closed, the contact between terminals 3 and 4 of auxiliary switch 1 changes from normally closed to normally open, and the contact between terminals 103 and 104, and the contact between terminals 13 and 14 of auxiliary switch 2, changes from normally closed to normally open. When the circuit breaker is in the closed position, the contact between terminals 111 and 112 of auxiliary switch 1 changes from normally closed to normally open, the contact between terminals 11 and 12 of auxiliary switch 1 changes from normally open to normally closed, and the contact between terminals 103 and 104, and the contact between terminals 13 and 14 of auxiliary switch 2, changes from normally open to normally closed.

[0005] The port 111 of the auxiliary switch 1 is connected to the port 101 of the auxiliary switch 1, the port 112 of the auxiliary switch 1 is connected to the port 102 of the auxiliary switch 1; the port 103 of the auxiliary switch 2 is connected to the port 113 of the auxiliary switch 2, the port 104 of the auxiliary switch 2 is connected to the port 114 of the auxiliary switch 2, the port 13 of the auxiliary switch 2 is connected to the port 23 of the auxiliary switch 2, and the port 14 of the auxiliary switch 2 is connected to the port 24 of the auxiliary switch 2; when the circuit breaker is in the open position, the auxiliary switch 1 The contact between No. 101 and No. 102 of auxiliary switch 1 changes from normally open to normally closed, and the contact between No. 113 and No. 114 of auxiliary switch 2 and the contact between No. 23 and No. 24 of auxiliary switch 2 changes from normally closed to normally open. When the circuit breaker is closed, the contact between No. 101 and No. 102 of auxiliary switch 1 changes from normally closed to normally open, and the contact between No. 113 and No. 114 of auxiliary switch 2 and the contact between No. 23 and No. 24 of auxiliary switch 2 changes from normally open to normally closed.

[0006] The rotating shaft of the auxiliary switch 1 is fixedly connected to the connecting rod 1, the rotating shaft of the auxiliary switch 2 is fixedly connected to the connecting rod 2, the connecting rod 2 is rotationally connected to the connecting rod 3 through the pin 1, the connecting rod 1 and the connecting rod 3 are rotationally connected to the connecting rod 4 through the pin 2, and the connecting rod 4 is connected to the crank arm of the circuit breaker through the pin 3.

[0007] One end of the coil of the relay 2 is connected to one end of the resistor 1, the other end of the resistor 1 is connected to one end of the capacitor 1, and the other end of the capacitor 1 is connected to the other end of the coil of the relay 2.

[0008] One end of the coil of the relay four is connected to one end of the resistor two, the other end of the resistor two is connected to one end of the capacitor two, and the other end of the capacitor two is connected to the other end of the coil of the relay four.

[0009] The models of the auxiliary switch 1 and the auxiliary switch 2 are F12-24 / 24DC.

[0010] The model of the relay 1 is UEG / P-2H2D / 220VDC.

[0011] Compared with the prior art, the utility model can effectively achieve low-pressure locking by setting a gas density meter, and prevent heavy movement through the circuit design of the conversion switch. It has a simple structure, is convenient and flexible, and has fewer components, which improves the work efficiency of testers and greatly reduces costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 This is a circuit diagram of the utility model.

[0013] Figure 2 A schematic diagram of the auxiliary switch. DETAILED DESCRIPTION

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] like Figure 1-Figure 2As shown, the first control power supply includes a first positive electrode +KMI and a first negative electrode -KMI, and the second control power supply includes a second positive electrode +KMII and a second negative electrode -KMII; the first positive electrode +KMI is connected to the third port and the first port of the gas density meter KDB, the fourth port of the gas density meter KDB is connected to one end of the coil of the relay K2, the other end of the coil of the relay K2 is connected to the first negative electrode -KMI, the second port of the gas density meter KDB is connected to one end of the coil of the relay K3, the other end of the coil of the relay K3 is connected to the first negative electrode -KMI, the second positive electrode +KMII is connected to the fifth port of the gas density meter KDB, and the sixth port of the gas density meter KDB is connected to the fourth relay K 4, and the other end of the coil of relay four K4 is connected to the second negative pole -KMII; the No. 1 port of the circuit breaker closing and opening handle SAC is connected to the first positive pole +KMI, the No. 2 port of the circuit breaker closing and opening handle SAC is connected to the No. 3 port of the auxiliary switch QF1 and the No. 13 and No. 21 ports of the relay K1, the No. 4 port of the auxiliary switch QF1 and the No. 14 port of the relay K1 are connected to one end of the coil of the relay K1, the other end of the coil of the relay K1 is connected to the first negative pole -KMI, the No. 22 port of the relay K1 is connected to the No. 111 port of the auxiliary switch QF1, the No. 112 port of the auxiliary switch QF1 is connected to one end of the closing coil Y1, and the closing line The other end of the coil Y1 passes through the normally closed contact of relay 2 K2 and is connected to the first negative pole - KMI. The contact between the No. 13 port and the No. 14 port of relay 1 K1 is a normally open contact. The contact between the No. 21 port and the No. 22 port of relay 1 K1 is a normally closed contact. The No. 3 port of the circuit breaker closing / opening handle SAC is connected to the first positive pole + KMI. The No. 4 port of the circuit breaker closing / opening handle SAC is connected to the No. 103 port of the auxiliary switch 2 QF2. The No. 104 port of the auxiliary switch 2 QF2 is connected to one end of the opening coil Y2. The other end of the opening coil Y2 passes through the normally closed contact of relay 2 K2 and is connected to the first negative pole - KMI. The No. 7 port of the circuit breaker closing / opening handle SAC is connected to the second positive pole + KMI. Pole +KMII, port 8 of the circuit breaker closing / opening handle SAC is connected to port 13 of auxiliary switch 2 QF2, port 14 of auxiliary switch 2 QF2 is connected to one end of opening coil 2 Y3, and the other end of opening coil 2 Y3 is connected to the second negative pole -KMII after passing through the normally closed contact of relay 4 K4; when the circuit breaker closing / opening handle SAC is closed, the contact between port 1 and port 2 of the circuit breaker closing / opening handle SAC is closed, and the contact between port 3 and port 4 and the contact between port 7 and port 8 are disconnected; when the circuit breaker closing / opening handle SAC is opened, port 1 and port 2 are disconnected, and the contact between port 3 and port 4 and the contact between port 7 and port 8 are closed;Auxiliary switches QF1 and QF2 are connected to the internal mechanism of the circuit breaker. When the circuit breaker is fully opened, the contact between terminals 111 and 112 of auxiliary switch QF1 changes from normally open to normally closed, the contact between terminals 3 and 4 of auxiliary switch QF1 changes from normally closed to normally open, and the contacts between terminals 103 and 104, and between terminals 13 and 14 of auxiliary switch QF2, change from normally closed to normally open. When the circuit breaker is fully closed, the contact between terminals 111 and 112 of auxiliary switch QF1 changes from normally closed to normally open, the contact between terminals 3 and 4 of auxiliary switch QF1 changes from normally open to normally closed, and the contacts between terminals 103 and 104, and between terminals 13 and 14 of auxiliary switch QF2, change from normally open to normally closed.

[0016] Connect port 111 of auxiliary switch QF1 to port 101 of auxiliary switch QF1, and port 112 of auxiliary switch QF1 to port 102 of auxiliary switch QF1; connect port 103 of auxiliary switch QF2 to port 113 of auxiliary switch QF2, connect port 104 of auxiliary switch QF2 to port 114 of auxiliary switch QF2, connect port 13 of auxiliary switch QF2 to port 23 of auxiliary switch QF2, and connect port 14 of auxiliary switch QF2 to port 24 of auxiliary switch QF2; circuit breaker When the switch is in the opening position, the contact between the No. 101 and No. 102 ports of the auxiliary switch QF1 changes from normally open to normally closed contacts, and the contact between the No. 113 and No. 114 ports of the auxiliary switch QF2 and the contact between the No. 23 and No. 24 ports of the auxiliary switch QF2 changes from normally closed to normally open contacts. When the circuit breaker is in the closing position, the contact between the No. 101 and No. 102 ports of the auxiliary switch QF1 changes from normally closed to normally open contacts, and the contact between the No. 113 and No. 114 ports of the auxiliary switch QF2 and the contact between the No. 23 and No. 24 ports of the auxiliary switch QF2 changes from normally open to normally closed contacts.

[0017] The rotating shaft of auxiliary switch QF1 is fixedly connected to connecting rod 1, the rotating shaft of auxiliary switch 2 QF2 is fixedly connected to connecting rod 2 2, connecting rod 2 2 is rotationally connected to connecting rod 3 4 through pin 1 3, connecting rod 1 1 and connecting rod 3 4 are rotationally connected to connecting rod 4 6 through pin 2 5, and connecting rod 4 6 is connected to the crank arm 8 of the circuit breaker through pin 3 7.

[0018] One end of the coil of relay K2 is connected to one end of resistor R1, the other end of resistor R1 is connected to one end of capacitor C1, and the other end of capacitor C1 is connected to the other end of the coil of relay K2.

[0019] One end of the coil of relay four K4 is connected to one end of resistor two R2, the other end of resistor two R2 is connected to one end of capacitor two C2, and the other end of capacitor two C2 is connected to the other end of the coil of relay four K4.

[0020] The models of auxiliary switch 1 QF1 and auxiliary switch 2 QF2 are F12-24 / 24DC.

[0021] The model of relay K1 is UEG / P-2H2D / 220VDC.

[0022] When the utility model is used, when the gas density meter KDB detects that the density of the insulating gas decreases, it indicates that the insulating gas may leak and the arc of the circuit breaker cannot be protected. If the opening and closing operations are performed at this time, there will be a great safety risk. At this time, the connection between port 1 and port 2 of the gas density meter KDB is closed, the coil of relay K3 is energized and an alarm signal is issued, the connection between port 3 and port 4 and port 5 and port 6 of the gas density meter KDB is closed and a locking signal is issued, the coils of circuit breaker 2 K2 and relay 4 K4 are energized, so that the normally closed contacts of circuit breaker 2 K2 and relay 4 K4 are disconnected, thereby disconnecting the main circuit of closing and opening, and closing and opening operations cannot be performed. The opening coil 1 Y2 and the opening coil 2 Y3 are controlled by two sets of power supplies to improve the reliability of the circuit.

[0023] When the circuit breaker is in the open position, the contact between ports 111 and 112 of auxiliary switch QF1 is normally closed, and the contact between ports 3 and 4 is normally open. The contact between ports 103 and 104 and between ports 13 and 14 of auxiliary switch QF2 is normally open. Relay K1 is in the de-energized state, and the normally closed contact between ports 21 and 22 of relay K1 is closed. When the circuit breaker needs to be closed, the circuit breaker closing handle SAC is moved to the closing position to close the connection between the No. 1 and No. 2 ports of the circuit breaker closing handle SAC. When the gas density meter KDB does not send a locking signal, the closing coil Y1 is energized to close the circuit breaker. After the circuit breaker is closed, the normally closed contact between the No. 111 and No. 112 ports of the auxiliary switch QF1 is converted to normally open contacts, and the contact between the No. 3 and No. 4 ports of the auxiliary switch QF1 is converted from normally open to normally closed contacts. The coil of the relay K1 is energized, and the contact between the No. 21 and No. 22 ports of the relay K1 is disconnected, so that the closing coil Y1 cannot be energized again. The contact between the No. 13 and No. 14 ports of the relay K1 is closed to keep the coil of the relay K1 in the energized state until the connection between the No. 1 and No. 2 ports of the circuit breaker closing handle SAC is disconnected, the coil of the relay K1 loses power, and the connection between the No. 21 and No. 22 ports of the relay K1 is restored to be closed. If a circuit breaker malfunctions and the circuit breaker closing handle SAC (Switching Contacts) remains permanently closed between terminals 1 and 2, energizing the closing circuit. This ensures that the coil of relay K1 remains energized, disconnecting terminals 21 and 22 of relay K1, rendering the closing circuit inoperable and requiring inspection. Simultaneously with the circuit breaker closing, the contacts between terminals 103 and 104, and terminals 13 and 14 of auxiliary switch QF2, switch from normally open to normally closed, preparing for the opening operation. Turn the circuit breaker closing / opening handle SAC to the opening position to close the connection between the No. 3 and No. 4 ports and between the No. 7 and No. 8 ports of the short circuit breaker closing / opening handle. The opening coil Y2 and the opening coil Y3 are energized to perform the opening operation. After the opening is in place, the contact between the No. 111 and No. 112 ports of the auxiliary switch QF1 changes from normally open to normally closed contact, the contact between the No. 3 and No. 4 ports of the auxiliary switch QF1 changes from normally closed to normally open contact, and the contact between the No. 103 and No. 104 ports and the contact between the No. 13 and No. 14 ports of the auxiliary switch QF2 changes from normally closed to normally open contact.

[0024] like Figure 2The auxiliary switches QF1 and QF2 are connected to the circuit breaker's crank arm 8 via a connecting rod structure. The circuit breaker's crank arm 8 is connected to the main shaft, accurately indicating circuit breaker operation. Connecting rods 1 and 2 are equal in length, while connecting rod 3 and 4 are equal in length to the distance between the rotating axes of auxiliary switches QF1 and QF2. This ensures that connecting rods 1 and 2 remain parallel and rotate at the same angle. The crank arm 8 drives the movement of pin 2 5 via connecting rod 4 6, which then rotates connecting rod 1. Connecting rod 3 and 4, via pin 1 3, rotate connecting rod 2, allowing auxiliary switches QF1 and QF2 to open and close according to the movement of the circuit breaker's crank arm 8.

[0025] The contacts between ports 111 and 112 in auxiliary switch QF1 are connected in parallel with the contacts between ports 101 and 102; the contacts between ports 103 and 104 in auxiliary switch QF2 are connected in parallel with the contacts between ports 113 and 114; the contacts between ports 13 and 14 in auxiliary switch QF2 are connected in parallel with the contacts between ports 23 and 24. The parallel contacts operate in the same way, which can prevent the entire device from failing to operate when one of the contacts fails.

[0026] The capacitors and resistors connected in parallel with the coils of relay two K2 and relay four K4 can filter and stabilize the voltage, thus playing an anti-interference role. The resistors can limit the current and generate voltage spikes when the coil circuit is disconnected. The capacitors can absorb the voltage spikes and protect the relay coils and other electronic components.

Claims

1. A three-phase circuit breaker control circuit, characterized in that: It includes a first control power supply, a second control power supply, a gas density meter (KDB), and a circuit breaker opening and closing handle (SAC); the first control power supply includes a first positive pole (+KMI) and a first negative pole (-KMI), and the second control power supply includes a second positive pole (+KMII) and a second negative pole (-KMII); the first positive pole (+KMI) is connected to the third port and the first port of the gas density meter (KDB), the fourth port of the gas density meter (KDB) is connected to one end of the coil of relay two (K2), the other end of the coil of relay two (K2) is connected to the first negative pole (-KMI), the second port of the gas density meter (KDB) is connected to one end of the coil of relay three (K3), and the other end of the coil of relay three (K3) is connected to the first negative pole (-KMI). One end is connected to the first negative pole (-KMI), the second positive pole (+KMII) is connected to the fifth port of the gas density meter (KDB), the sixth port of the gas density meter (KDB) is connected to one end of the coil of relay four (K4), and the other end of the coil of relay four (K4) is connected to the second negative pole (-KMII); the first port of the circuit breaker closing / opening handle (SAC) is connected to the first positive pole (+KMI), the second port of the circuit breaker closing / opening handle (SAC) is connected to the third port of the auxiliary switch one (QF1) and the thirteenth and twenty-first ports of relay one (K1), the fourth port of the auxiliary switch one (QF1) and the fourteenth port of relay one (K1) are connected to one end of the coil of relay one (K1), and the relay one (K1) is connected to the fourth port of the auxiliary switch one (QF1). The other end of the coil of electrical appliance 1 (K1) is connected to the first negative pole (-KMI), the No. 22 port of relay 1 (K1) is connected to the No. 111 port of auxiliary switch 1 (QF1), the No. 112 port of auxiliary switch 1 (QF1) is connected to one end of the closing coil (Y1), the other end of the closing coil (Y1) is connected to the first negative pole (-KMI) after passing through the normally closed contact of relay 2 (K2), the contact between the No. 13 and No. 14 ports of relay 1 (K1) is a normally open contact, and the contact between the No. 21 and No. 22 ports of relay 1 (K1) is a normally closed contact; the No. 3 port of the circuit breaker closing / opening handle (SAC) is connected to the first positive pole (+KMI), the circuit breaker closing / opening handle (SAC) The fourth port of the circuit breaker is connected to the 103th port of the auxiliary switch 2 (QF2), the 104th port of the auxiliary switch 2 (QF2) is connected to one end of the opening coil 1 (Y2), and the other end of the opening coil 1 (Y2) is connected to the first negative pole (-KMI) after passing through the normally closed contact of the relay 2 (K2); the seventh port of the circuit breaker closing handle (SAC) is connected to the second positive pole (+KMII), the eighth port of the circuit breaker closing handle (SAC) is connected to the 13th port of the auxiliary switch 2 (QF2), the fourteenth port of the auxiliary switch 2 (QF2) is connected to one end of the opening coil 2 (Y3), and the other end of the opening coil 2 (Y3) is connected to the second negative pole (-KMII) after passing through the normally closed contact of the relay 4 (K4);When the circuit breaker closing / opening handle (SAC) is closed, the contacts between the No. 1 and No. 2 ports of the circuit breaker closing / opening handle (SAC) are closed, and the contacts between the No. 3 and No. 4 ports and the contacts between the No. 7 and No. 8 ports are disconnected. When the circuit breaker is opened, the No. 1 and No. 2 ports of the circuit breaker closing / opening handle (SAC) are disconnected, and the contacts between the No. 3 and No. 4 ports and the contacts between the No. 7 and No. 8 ports are closed. Auxiliary switch 1 (QF1) and auxiliary switch 2 (QF2) are connected to the internal mechanism of the circuit breaker. When the circuit breaker is opened, the contacts between the No. 111 and No. 112 ports of auxiliary switch 1 (QF1) are changed from normally open to normally closed contacts. The contact between terminals 3 and 4 of auxiliary switch 1 (QF1) changes from normally closed to normally open, and the contact between terminals 103 and 104, and the contact between terminals 13 and 14 of auxiliary switch 2 (QF2) changes from normally closed to normally open. When the circuit breaker is fully closed, the contact between terminals 111 and 112 of auxiliary switch 1 (QF1) changes from normally closed to normally open, the contact between terminals 3 and 4 of auxiliary switch 1 (QF1) changes from normally open to normally closed, and the contact between terminals 103 and 104, and the contact between terminals 13 and 14 of auxiliary switch 2 (QF2) changes from normally open to normally closed.

2. The three-phase circuit breaker control circuit according to claim 1, characterized in that: The port 111 of the auxiliary switch 1 (QF1) is connected to the port 101 of the auxiliary switch 1 (QF1), and the port 112 of the auxiliary switch 1 (QF1) is connected to the port 102 of the auxiliary switch 1 (QF1); the port 103 of the auxiliary switch 2 (QF2) is connected to the port 113 of the auxiliary switch 2 (QF2), the port 104 of the auxiliary switch 2 (QF2) is connected to the port 114 of the auxiliary switch 2 (QF2), the port 13 of the auxiliary switch 2 (QF2) is connected to the port 23 of the auxiliary switch 2 (QF2), and the port 14 of the auxiliary switch 2 (QF2) is connected to the port 2 Port No. 14; when the circuit breaker is in the opening position, the contact between ports No. 101 and No. 102 of auxiliary switch 1 (QF1) changes from normally open to normally closed, and the contact between ports No. 113 and No. 114 of auxiliary switch 2 (QF2) and the contact between ports No. 23 and No. 24 change from normally closed to normally open. When the circuit breaker is in the closing position, the contact between ports No. 101 and No. 102 of auxiliary switch 1 (QF1) changes from normally closed to normally open, and the contact between ports No. 113 and No. 114 of auxiliary switch 2 (QF2) and the contact between ports No. 23 and No. 24 change from normally open to normally closed.

3. The three-phase circuit breaker control circuit according to any one of claims 1-2, characterized in that: The rotating shaft of the auxiliary switch 1 (QF1) is fixedly connected to the connecting rod 1 (1), the rotating shaft of the auxiliary switch 2 (QF2) is fixedly connected to the connecting rod 2 (2), the connecting rod 2 (2) is rotationally connected to the connecting rod 3 (4) through the pin 1 (3), the connecting rod 1 (1) and the connecting rod 3 (4) are rotationally connected to the connecting rod 4 (6) through the pin 2 (5), and the connecting rod 4 (6) is connected to the crank arm (8) of the circuit breaker through the pin 3 (7).

4. The three-phase circuit breaker control circuit according to claim 1, characterized in that: One end of the coil of relay 2 (K2) is connected to one end of resistor 1 (R1), the other end of resistor 1 (R1) is connected to one end of capacitor 1 (C1), and the other end of capacitor 1 (C1) is connected to the other end of the coil of relay 2 (K2).

5. The three-phase circuit breaker control circuit according to claim 1, characterized in that: One end of the coil of relay four (K4) is connected to one end of resistor two (R2), the other end of resistor two (R2) is connected to one end of capacitor two (C2), and the other end of capacitor two (C2) is connected to the other end of the coil of relay four (K4).

6. The three-phase circuit breaker control circuit according to claim 1, characterized in that: The models of the auxiliary switch 1 (QF1) and the auxiliary switch 2 (QF2) are F12-24 / 24DC.

7. The three-phase circuit breaker control circuit according to claim 1, characterized in that: The model of the relay 1 (K1) is UEG / P-2H2D / 220VDC.

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