CN210744593U - Electrical interlocking circuit of inlet wire cabinet, electrical interlocking device of inlet wire cabinet and PT cabinet - Google Patents

Abstract

The utility model belongs to the technical field of the PT cabinet, especially, relate to an inlet wire cabinet electrical interlocking circuit, inlet wire cabinet electrical interlocking device and PT cabinet, through set up travel switch between miniature circuit breaker and vacuum circuit breaker, make the ground connection handcart interlock with the inlet wire cabinet through the on-off state of control travel switch, the interlocking of having solved current ground connection handcart and inlet wire cabinet adopts the on-off return circuit that the operating position of auxiliary relay extension ground connection handcart comes interlocking high-pressure inlet wire cabinet usually, there is the problem of great potential safety hazard.

Description

An electrical interlocking circuit for an incoming cabinet, an electrical interlocking device for an incoming cabinet, and a PT cabinet

technical field

The utility model relates to the technical field of PT cabinets, in particular to an electrical interlocking circuit of an incoming cabinet, an electrical interlocking device of the incoming cabinet and a PT cabinet.

Background technique

At present, the high-voltage grounding handcart is usually in the form of pushing the busbar PT cabinet (voltage transformer cabinet). During normal operation, the PT cabinet is pushed in. When the grounding maintenance is required, the PT cabinet is pushed out and the grounding handcart is replaced. However, the existing interlocking of the grounding handcart and the incoming cabinet usually uses an intermediate relay to extend the working position of the grounding handcart to interlock the closing and opening circuits of the high-voltage incoming cabinet, which has a great potential safety hazard.

Utility model content

The purpose of the utility model is to provide an electrical interlocking circuit of the incoming cabinet, an electrical interlocking device of the incoming cabinet and a PT cabinet, aiming at solving the interlocking between the existing grounding handcart and the incoming cabinet, which usually adopts an intermediate relay to extend the grounding hand. The working position of the car is used to interlock the closing and opening circuits of the high-voltage incoming cabinet, and there is a big safety hazard problem.

The embodiment of the present utility model provides an electrical interlocking circuit of an incoming cabinet, which is connected to an AC power supply. The electrical interlocking circuit of the incoming cabinet includes: a miniature circuit breaker, a first key switch, a second key switch, a travel switch, and a vacuum circuit breaker;

The first input end of the miniature circuit breaker is connected to the first end of the AC power source, the second input end of the miniature circuit breaker is connected to the second end of the AC power source, the first end of the miniature circuit breaker is connected to the second end of the AC power source The output end, the first end of the first key switch, the first end of the second key switch and the first end of the normally open auxiliary contact of the travel switch are connected together, and the normally open auxiliary contact of the travel switch is connected in common. The second end of the contact and the second end of the second key switch are connected to the first opening signal end of the vacuum circuit breaker, and the second end of the first key switch is connected to the normal signal end of the travel switch. The first end of the closed auxiliary contact is connected, the second end of the normally closed auxiliary contact of the travel switch is connected to the first closing signal end of the vacuum circuit breaker, and the second opening signal of the vacuum circuit breaker is connected. The terminal is connected to the second output terminal of the micro-circuit breaker in common with the second closing signal terminal of the vacuum circuit breaker.

Optionally, the vacuum circuit breaker includes: a first rectifier bridge, a second rectifier bridge, an anti-jump relay, a current limiting resistor, a trip coil, a closing coil and an auxiliary switch of the vacuum circuit breaker;

The first input end of the first rectifier bridge is connected with the second end of the normally closed contact of the travel switch, and the second input end of the first rectifier bridge is connected with the second output end of the miniature circuit breaker , the first output end of the first rectifier bridge is connected with the first end of the first normally open auxiliary contact of the auxiliary switch of the vacuum circuit breaker and the first end of the auxiliary contact of the anti-jump relay, the The second end of the first normally open auxiliary contact of the auxiliary switch of the vacuum circuit breaker, the second end of the auxiliary contact of the anti-jump relay, and the first end of the current limiting resistor are connected in common. The second end is connected to the first end of the coil of the anti-jump relay, the second end of the coil of the anti-jump relay, the second output end of the first rectifier bridge and the first end of the closing coil Commonly connected, the second end of the closing coil is connected to the first end of the first normally closed auxiliary contact of the auxiliary switch of the vacuum circuit breaker, and the first normally closed auxiliary contact of the auxiliary switch of the vacuum circuit breaker The second end is connected to the first end of the second normally closed auxiliary contact of the auxiliary switch of the vacuum circuit breaker, and the second end of the second normally closed auxiliary contact of the auxiliary switch of the vacuum circuit breaker is connected to the anti-jump relay The third end of the auxiliary contact of the second rectifier bridge is connected to the third end of the auxiliary contact, the first input end of the second rectifier bridge is connected to the second end of the normally open contact of the travel switch, and the second input end of the second rectifier bridge is connected to the the first end of the second normally open contact of the auxiliary switch of the vacuum circuit breaker is connected, and the second end of the second normally open contact of the auxiliary switch of the vacuum circuit breaker is connected to the second output end of the micro-circuit breaker, The first output end of the second rectifier bridge is connected to the first end of the trip coil, and the second output end of the second rectifier bridge is connected to the second end of the trip coil.

Optionally, the vacuum circuit breaker further includes a micro switch, and the micro switch is provided between the second end of the second normally closed auxiliary contact of the auxiliary switch of the vacuum circuit breaker and the auxiliary contact of the anti-jump relay. point between the third ends.

Optionally, the vacuum circuit breaker further includes an aviation socket, and the aviation socket includes four sockets, and the four sockets are respectively arranged at the first opening signal end, the second opening signal end, the third opening signal end of the vacuum circuit breaker. A closing signal terminal and a second closing signal terminal.

Optionally, the model of the aviation socket is CZ-58.

Optionally, the model of the travel switch is LXW20-11.

Optionally, the model of the miniature circuit breaker is iC65N-2P.

The embodiment of the present application also provides an electrical interlocking device for an incoming cabinet, including:

the first AC power port;

the second AC power port;

The electrical interlock circuit of the incoming cabinet according to any one of the above, wherein the electrical interlocking circuit of the incoming cabinet is respectively connected to the first AC power port and the second AC power port; and

A grounding handcart for controlling the switch state of the travel switch.

An embodiment of the present application further provides a PT cabinet, which includes a cabinet body, and the cabinet is provided with the electrical interlock circuit of the incoming cabinet as described in any one of the above.

The utility model provides an electrical interlocking circuit of an incoming cabinet, an electrical interlocking device of the incoming cabinet and a PT cabinet. By arranging a travel switch between a miniature circuit breaker and a vacuum circuit breaker, the grounding handcart can pass through the control circuit of the travel switch. The switch state is interlocked with the incoming cabinet, which solves the problem of the existing interlocking of the grounding handcart and the incoming cabinet. Usually, an intermediate relay is used to extend the working position of the grounding handcart to interlock the closing and opening circuits of the high-voltage incoming cabinet. security risks.

Description of drawings

1 is a schematic structural diagram of an electrical interlocking circuit of an incoming cabinet provided by an embodiment of the present utility model;

FIG. 2 is a schematic structural diagram of another electrical interlocking circuit of an incoming line cabinet provided by an embodiment of the present utility model;

3 is a schematic diagram of a PT cabinet provided by an embodiment of the present application;

4 is a schematic diagram of a PT handcart provided by an embodiment of the present application being pushed into a PT cabinet;

FIG. 5 is a schematic diagram of pushing a grounding handcart into a PT cabinet according to an embodiment of the present application.

Detailed ways

In order to make the purpose, technical solutions and advantages of the present utility model more clearly understood, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not intended to limit the present invention.

In the description of the present invention, it should be understood that the terms "first" and "second" are only used for description purposes, and cannot be interpreted as indicating or implying relative importance or indicating the number of technical features indicated. . Thus, a feature defined as "first" or "second" may expressly or implicitly include one or more of that feature.

FIG. 1 is a schematic structural diagram of an electrical interlocking circuit of an incoming cabinet provided by an embodiment of the present utility model. Referring to FIG. 1 , the electrical interlocking circuit of the incoming cabinet in this embodiment is connected to an AC power supply, and the incoming wire The electrical interlock circuit of the cabinet includes: a miniature circuit breaker QF, a first key switch 2HA, a second key switch 2TA, a travel switch and a vacuum circuit breaker 10; the first input end 1 of the miniature circuit breaker QF is connected to the AC power supply. The first end L is connected, the second input end 3 of the miniature circuit breaker QF is connected to the second end N of the AC power supply, the first output end 2 of the miniature circuit breaker QF, the first key switch 2HA The first end of the second key switch 2TA and the first end of the normally open auxiliary contact XC2 of the travel switch are connected together, and the second end of the normally open auxiliary contact XC2 of the travel switch , The second end of the second key switch 2TA is connected to the first opening signal terminal 12 of the vacuum circuit breaker 10, and the second end of the first key switch 2HA is connected to the normally closed auxiliary of the travel switch. The first end of the contact XC1 is connected, the second end of the normally closed auxiliary contact XC1 of the travel switch is connected with the first closing signal end 11 of the vacuum circuit breaker, and the second opening of the vacuum circuit breaker The signal terminal 14 and the second closing signal terminal 13 of the vacuum circuit breaker are commonly connected to the second output terminal 4 of the micro-circuit breaker.

In this embodiment, a travel switch is arranged between the miniature circuit breaker QF and the vacuum circuit breaker 10, so that the grounding handcart is interlocked with the incoming cabinet by controlling the switch state of the travel switch, and the normally open auxiliary contact of the travel switch XC2 is connected in parallel with the second key switch 2TA, and is connected in series with the first opening signal terminal 12 of the vacuum circuit breaker 10, and the normally closed auxiliary contact XC1 of the travel switch is connected in series with the first key switch 2HA. When contacted, no current flows into the first opening signal terminal 12 and the second opening signal terminal 14 of the vacuum circuit breaker 10, the normally closed auxiliary contact XC1 of the travel switch is in a closed state, and the first closing of the vacuum circuit breaker 10 is closed. There is conduction between the signal terminal 11 and the second closing signal terminal 13. When the grounding handcart contacts the travel switch and changes the switch state of the travel switch, the normally open auxiliary contact XC2 of the travel switch is closed at this time, and the normally closed auxiliary The contact XC1 is disconnected. At this time, the trip circuit in the vacuum circuit breaker 10 is connected, and the auxiliary contact in the closing circuit is disconnected, so that the closing circuit of the incoming cabinet is disconnected, thereby avoiding the failure of the intermediate relay. Security risks.

In one embodiment, the connection between the first input end 1 and the first output end 2 of the miniature circuit breaker QF is equivalent to an overcurrent and overvoltage protection switch, and the connection between the second input end 3 and the second output end 4 is equivalent to an overcurrent and overvoltage protection switch. Safety switch, the miniature circuit breaker QF is mainly used for line protection in the environment of overload, short circuit, overcurrent, voltage loss, undervoltage, grounding, leakage, etc. For example, when the AC voltage signal provided by the AC power supply is in overvoltage When the overvoltage protection is triggered, the armature of the overcurrent release is pulled in to make the free trip mechanism act, the main contact disconnects the main circuit, the first input end 1 and the first output end 2 are disconnected, and the second input The terminal 3 and the second output terminal 4 are disconnected.

In one embodiment, the model of the first key switch 2HA is LA38-11 R, and the model of the second key switch 2TA is LA38-11 G.

In one embodiment, the vacuum circuit breaker 10 may be an existing vacuum circuit breaker switch, and its model may be ZW32, ZW32-24, ZW20, ZN28, ZN73, ZN12, ZN23, ZN85, etc.

In one embodiment, as shown in FIG. 2 , the vacuum circuit breaker 10 includes: a first rectifier bridge V1, a second rectifier bridge V2, an anti-jump relay, a current limiting resistor R0, a trip coil TQ, a closing coil HQ and Auxiliary switch of vacuum circuit breaker; the first input end of the first rectifier bridge V1 is connected to the second end of the normally closed contact XC1 of the travel switch, and the second input end of the first rectifier bridge V1 is connected to the The second output end 4 of the miniature circuit breaker QF is connected, the first output end of the first rectifier bridge V1 is connected to the first end of the first normally open auxiliary contact HK1 of the auxiliary switch of the vacuum circuit breaker and the anti-jump The first end 5 of the auxiliary contact KO2 of the relay is connected, the second end of the first normally open auxiliary contact HK1 of the auxiliary switch of the vacuum circuit breaker, the second end 7 of the auxiliary contact KO2 of the anti-jump relay, and The first end of the current limiting resistor R0 is connected in common, the second end of the current limiting resistor R0 is connected with the first end of the coil KO1 of the anti-jump relay, and the second end of the coil KO1 of the anti-jump relay , The second output end of the first rectifier bridge V1 and the first end of the closing coil HQ are connected together, and the second end of the closing coil HQ is connected to the first normally closed auxiliary switch of the vacuum circuit breaker. The first end of the auxiliary contact HK2 is connected, and the second end of the first normally closed auxiliary contact HK2 of the auxiliary switch of the vacuum circuit breaker is connected to the first end of the second normally closed auxiliary contact HK3 of the auxiliary switch of the vacuum circuit breaker. The second end of the second normally closed auxiliary contact HK3 of the auxiliary switch of the vacuum circuit breaker is connected to the third end 6 of the auxiliary contact KO of the anti-jump relay, and the second end of the second rectifier bridge V2 An input end is connected to the second end of the normally open contact XC2 of the travel switch, and the second input end of the second rectifier bridge V2 is connected to the second end of the second normally open contact HK4 of the auxiliary switch of the vacuum circuit breaker One end is connected, the second end of the second normally open contact HK4 of the auxiliary switch of the vacuum circuit breaker is connected with the second output end 4 of the miniature circuit breaker QF, and the first output end of the second rectifier bridge V2 It is connected to the first end of the trip coil TQ, and the second output end of the second rectifier bridge V2 is connected to the second end of the trip coil TQ.

In this embodiment, when the grounding handcart does not move, the closing circuit is connected, the first rectifier bridge V1 rectifies the AC signal to obtain a DC signal, the closing coil HQ is powered on, and the first normally closed auxiliary contact HK2 It is closed with the second normally closed auxiliary contact HK3, the coil KO1 of the anti-jump relay is energized, the auxiliary contact KO2 of the anti-jump relay is connected to the second terminal 7, and when the coil KO1 of the anti-jump relay is not energized, the auxiliary contact of the discharge relay is energized. Point KO2 is connected to the third terminal 6.

In this embodiment, when the grounding handcart is in contact with the travel switch and the switch state of the travel switch is changed, the normally open auxiliary contact XC2 of the travel switch is closed at this time, the normally closed auxiliary contact XC1 is disconnected, and the vacuum circuit is disconnected at this time. The trip circuit in the device 10 is turned on, the second rectifier bridge V2 rectifies the AC signal to obtain a DC signal, the trip coil TQ is powered on, the second normally open contact HK4 is closed, the first normally closed auxiliary contact HK2 and the second The normally closed auxiliary contact HK3 is disconnected, and the auxiliary contact in the closing circuit is disconnected, so that the closing circuit of the incoming cabinet is disconnected, thereby avoiding the potential safety hazard caused by the failure of the intermediate relay.

In one embodiment, the vacuum circuit breaker further includes a micro switch SP1, and the micro switch SP1 is arranged between the second end of the second normally closed auxiliary contact HK3 of the auxiliary switch of the vacuum circuit breaker and the anti-lock switch. Jump between the third terminals of the auxiliary contact KO2 of the relay. In this embodiment, the micro switch SP1 is closed after the energy storage is completed.

In one embodiment, the vacuum circuit breaker 10 further includes an aviation socket, and the aviation socket includes four sockets XO1, XO2, XO3 and XO4, and the four sockets XO1, XO2, XO3 and XO4 are respectively arranged on the vacuum circuit breaker The device 10 has a first closing signal terminal 11 , a second closing signal terminal 13 , a first opening signal terminal 12 and a second opening signal terminal 14 .

In this embodiment, the aviation socket is used to physically isolate the vacuum circuit breaker for a second time during the maintenance of the vacuum circuit breaker, so as to avoid electric shock accidents caused by misoperation during the maintenance process. The aviation socket socket XO1 is arranged at the first closing signal terminal 11 of the vacuum circuit breaker 10, and the two ends of the aviation socket socket XO1 are respectively connected with the first input terminal of the first rectifier bridge V1 and the normally closed contact XC1 of the travel switch. The second end is connected, the aviation socket socket XO2 is arranged at the second closing signal terminal 13 of the vacuum circuit breaker 10, and the two ends of the aviation socket socket XO2 are respectively connected with the second input terminal of the first rectifier bridge V1 and the first terminal of the miniature circuit breaker QF. The two output ends 4 are connected, the aviation socket socket XO3 is arranged at the first opening signal terminal 12 of the vacuum circuit breaker 10, and the two ends of the aviation socket socket XO3 are respectively connected with the second end of the normally open contact XC2 of the travel switch and the second rectifier The first input end of the bridge V2 is connected, the aviation socket socket XO4 is arranged at the second opening signal terminal 14 of the vacuum circuit breaker 10, and the two ends of the aviation socket socket XO4 are respectively connected with the second normally open contact HK4 of the auxiliary switch of the vacuum circuit breaker The second end of the circuit breaker is connected to the second output end 4 of the miniature circuit breaker QF.

In one embodiment, the model of the aviation socket is CZ-58.

In one embodiment, the model of the travel switch is LXW20-11.

In one embodiment, the model of the miniature circuit breaker is iC65N-2P.

In one embodiment, an embodiment of the present application further provides an electrical interlocking device for an incoming cabinet, including: a first AC power port; a second AC power port; the incoming cabinet according to any one of the above an electrical interlocking circuit, the electrical interlocking circuit of the incoming cabinet is respectively connected with the first AC power port and the second AC power port; and a grounding handcart for controlling the switch state of the travel switch .

In this embodiment, the electrical interlock circuit of the incoming cabinet is set in the PT cabinet, and the travel switch is set on the PT cabinet. The travel switch has an opening and a closing auxiliary point. During the application process, the PT handcart and the grounding handcart Push the PT cabinet to work, in which the PT handcart has the same shape as the grounding handcart, and a bracket is set on the grounding handcart, which can push the limit switch at the working position of the grounding handcart to change the state of the auxiliary point of the limit switch , so that the closing point of the auxiliary point is connected in parallel with the trip circuit of the incoming cabinet, and the open point is connected in series with the closing circuit of the incoming cabinet.

In this embodiment, during normal operation, because the PT handcart has no mounting bracket, the PT handcart cannot reach the travel switch at this time, which has no effect on the incoming cabinet. When it reaches the working position, push to the travel switch, close the normally open auxiliary contact XC2 of the travel switch, and disconnect the normally closed auxiliary contact XC1. At this time, the normally open auxiliary contact XC2 connected in parallel to the trip circuit is closed, and the trip circuit is connected At the same time, the normally closed auxiliary contact XC1 in series in the closing circuit becomes an open point, so that the closing circuit of the incoming cabinet can not be turned on.

In one embodiment, this embodiment provides a PT cabinet, which includes a cabinet body, and the cabinet is provided with the electrical interlock circuit of the incoming cabinet as described in any one of the above.

3 is a schematic diagram of a PT cabinet provided by an embodiment of the present application. In this embodiment, a travel switch is provided on the inner side wall of the PT cabinet. When the PT handcart is pushed into the PT cabinet, the travel switch does not act. When the vehicle is pushed into the PT cabinet, the travel switch is activated. At this time, the normally open auxiliary contact XC2 of the travel switch is closed, and the normally closed auxiliary contact XC1 is disconnected. At this time, the trip circuit in the vacuum circuit breaker 10 is connected, and the closing circuit is closed. The auxiliary contacts in the circuit breaker are disconnected, so that the closing circuit of the incoming cabinet is disconnected, thereby avoiding the potential safety hazard caused by the failure of the intermediate relay.

4 is a schematic diagram of a PT handcart provided by an embodiment of the application being pushed into a PT cabinet. Referring to FIG. 4 , at this time, the PT handcart cannot be pushed to the travel switch, and the state of the travel switch cannot be changed, and FIG. 5 is the present application. A schematic diagram of pushing the grounding handcart into the PT cabinet provided by an embodiment of the present invention is shown in Figure 5. The PT car and the grounding handcart have the same shape, and the grounding handcart is provided with a The contact bracket, the bracket can push the travel switch when the grounding car is in the working position to change the state of the auxiliary point of the travel switch. When the grounding car is pushed to the working position, it pushes the travel switch to change the open point of the travel switch to the closed point and connect in parallel. When the auxiliary point of the trip circuit is closed, the trip circuit is connected, thereby tripping the incoming cabinet. At the same time, the auxiliary point in series in the closing circuit becomes an open point, so that the closing circuit of the incoming cabinet cannot be turned on. .

The utility model provides an electrical interlocking circuit of an incoming cabinet, an electrical interlocking device of the incoming cabinet and a PT cabinet. By arranging a travel switch between a miniature circuit breaker and a vacuum circuit breaker, the grounding handcart can pass through the control circuit of the travel switch. The switch state is interlocked with the incoming cabinet, which solves the problem of the existing interlocking of the grounding handcart and the incoming cabinet. Usually, an intermediate relay is used to extend the working position of the grounding handcart to interlock the closing and opening circuits of the high-voltage incoming cabinet. security risks.

The above are only optional embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included in the present invention. within the scope of protection of the utility model.

Claims (9)

1. An inlet wire cabinet electrical interlocking circuit is connected with an alternating current power supply, and is characterized in that the inlet wire cabinet electrical interlocking circuit comprises: the device comprises a miniature circuit breaker, a first key switch, a second key switch, a travel switch and a vacuum circuit breaker;

the first input end of the miniature circuit breaker is connected with the first end of the alternating current power supply, the second input end of the miniature circuit breaker is connected with the second end of the alternating current power supply, the first output end of the miniature circuit breaker, the first end of the first key switch, the first end of the second key switch and the first end of the normally open auxiliary contact of the travel switch are connected in common, the second end of the normally open auxiliary contact of the travel switch and the second end of the second key switch are connected with the first switching signal end of the vacuum circuit breaker, the second end of the first key switch is connected with the first end of the normally closed auxiliary contact of the travel switch, the second end of the normally closed auxiliary contact of the travel switch is connected with the first closing signal end of the vacuum circuit breaker, and a second switching-off signal end of the vacuum circuit breaker and a second switching-on signal end of the vacuum circuit breaker are connected to a second output end of the miniature circuit breaker in a sharing mode.

2. The inlet cabinet electrical interlock circuit of claim 1, wherein the vacuum circuit breaker comprises: the circuit comprises a first rectifier bridge, a second rectifier bridge, an anti-tripping relay, a current-limiting resistor, a trip coil, a closing coil and a vacuum circuit breaker auxiliary switch;

the first input end of the first rectifier bridge is connected with the second end of the normally closed contact of the travel switch, the second input end of the first rectifier bridge is connected with the second output end of the miniature circuit breaker, the first output end of the first rectifier bridge is connected with the first end of the first normally open auxiliary contact of the vacuum circuit breaker auxiliary switch and the first end of the auxiliary contact of the anti-tripping relay, the second end of the first normally open auxiliary contact of the vacuum circuit breaker auxiliary switch, the second end of the auxiliary contact of the anti-tripping relay and the first end of the current limiting resistor are connected in common, the second end of the current limiting resistor is connected with the first end of the coil of the anti-tripping relay, the second output end of the first rectifier bridge and the first end of the closing coil are connected in common, and the second end of the closing coil is connected with the first end of the first auxiliary normally closed contact of the vacuum circuit breaker auxiliary switch, the second end of the first normally closed auxiliary contact of the vacuum circuit breaker auxiliary switch is connected with the first end of the second normally closed auxiliary contact of the vacuum circuit breaker auxiliary switch, the second end of the second normally closed auxiliary contact of the auxiliary switch of the vacuum circuit breaker is connected with the third end of the auxiliary contact of the anti-tripping relay, the first input end of the second rectifier bridge is connected with the second end of the normally open contact of the travel switch, the second input end of the second rectifier bridge is connected with the first end of a second normally open contact of the auxiliary switch of the vacuum circuit breaker, the second end of the second normally open contact of the auxiliary switch of the vacuum circuit breaker is connected with the second output end of the miniature circuit breaker, and the first output end of the second rectifier bridge is connected with the first end of the tripping coil, and the second output end of the second rectifier bridge is connected with the second end of the tripping coil.

3. The inlet cabinet electrical interlock circuit of claim 2, wherein the vacuum circuit breaker further comprises a micro switch disposed between the second end of the second normally closed auxiliary contact of the vacuum circuit breaker auxiliary switch and the third end of the auxiliary contact of the anti-trip relay.

4. The inlet cabinet electrical interlock circuit of claim 2, wherein the vacuum circuit breaker further comprises an aerial socket, the aerial socket comprising four sockets, the four sockets being respectively disposed at the first switching signal terminal, the second switching signal terminal, the first switching signal terminal, and the second switching signal terminal of the vacuum circuit breaker.

5. The inlet cabinet electrical interlock circuit of claim 4, wherein the aircraft receptacle is of the type CZ-58.

6. The inlet cabinet electrical interlock circuit of claim 1, wherein the travel switch is of the type LXW 20-11.

7. The inlet cabinet electrical interlock circuit of claim 1, wherein the miniature circuit breaker is of type iC 65N-2P.

8. An inlet cabinet electrical interlock, comprising:

a first AC power supply port;

a second AC power port;

the inlet cabinet electrical interlock circuit of any one of claims 1-7, connected to the first ac power port and the second ac power port, respectively; and

and the grounding handcart is used for controlling the working state of the travel switch.

9. A PT cabinet, characterized by comprising a cabinet body, wherein the PT cabinet is internally provided with an incoming cabinet electric interlocking circuit according to any one of claims 1-7.

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