Switch cabinet capable of self-checking after locking

Abstract

The invention relates to the technical field of high-low voltage cabinets, in particular to a self-checking switch cabinet after locking, which comprises a cabinet body, a circuit breaker, a self-checking sensor, a triggering mechanism, a forced circuit breaking mechanism and a grounding mechanism, and is characterized in that the circuit breaker is mounted in the cabinet body, and the self-checking sensor is mounted on the surface of the cabinet body; the trigger mechanism is installed at the bottom of the circuit breaker, the forced circuit breaking mechanism is installed in the circuit breaker, the grounding mechanism is installed at the bottom of the circuit breaker, and the trigger mechanism is connected with the forced circuit breaking mechanism and the grounding mechanism. The trigger mechanism can firstly control the forced circuit breaking mechanism to break the circuit breaker and then control the grounding mechanism to ground the switch cabinet, so that the power supply of the equipment is cut off in time, the equipment is prevented from being burnt or damaged, grounding is carried out after power failure, and the safety of subsequent maintenance workers is ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of high and low voltage switch cabinets, and particularly to a self-checking switch cabinet after locking. Background Art

[0002] Partial discharge (PD) in a switch cabinet refers to a local electrical discharge phenomenon that occurs inside the switch cabinet or in its insulation system. In a switch cabinet, partial discharge refers to a local electrical discharge phenomenon generated under the action of high voltage due to insulation defects or non-uniformities. Such a discharge usually does not immediately cause the insulation breakdown of the entire system, but will generate local high-energy discharges, resulting in the gradual damage of the insulation material. The occurrence of PD in a switch cabinet may lead to the gradual deterioration of the insulation material, and ultimately may lead to insulation failure and electrical faults. Therefore, the monitoring and detection of PD in switch cabinets are very important.

[0003] The existing monitoring and detection methods for partial discharge in switch cabinets mainly include ultrasonic (AA / AE) monitoring method, earth voltage (TEV) monitoring method and ultra-high frequency (UHF) monitoring method. After detecting partial discharge in the switch cabinet, usually relevant technical workers enter the distribution room, immediately stop the operation of relevant equipment, then isolate the discharged switch cabinet to ensure that it is no longer connected to other parts of the power system, and then carry out maintenance and replace the faulty equipment. Partial discharge shows a certain degree of complexity. Usually, partial discharge is likely to occur at the parts where the internal breakdown field strength of the insulation is relatively low, and the electric field distribution inside the insulation medium and the electrical performance of the insulation both play a decisive role in the conditions for the occurrence of partial discharge. In the actual detection process, it is necessary to select reasonable and applicable detection methods and analysis methods to promptly eliminate faults and ensure that the switch cabinet is in good operating condition.

[0004] However, due to the processing by technical workers, there is a certain time difference from discovery to power-off, which is likely to cause untimely handling of partial discharge problems, resulting in a decrease in the insulation performance of the insulation material inside the switch cabinet, unstable changes in the electrical parameters inside the switch cabinet, and the arc discharge generated by partial discharge may also generate high temperature, strong light and harmful gases, and may even cause a fire in severe cases.

[0005] Therefore, a self-checking switch cabinet after locking is proposed. Summary of the Invention

[0006] The purpose of this part is to outline some aspects of the embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this part, as well as in the abstract and title of the present application, to avoid obscuring the purpose of this part, the abstract and the title, and such simplifications or omissions cannot be used to limit the scope of the present invention.

[0007] In view of the problem that the existing switchgear fails to cut off the power manually in time after detecting partial discharge, the present invention is proposed.

[0008] Therefore, the object of the present invention is to provide a self-checking switchgear after locking, which aims to cut off the circuit in time to stop the relevant equipment after detecting partial discharge of the switchgear, and ground the switchgear to introduce the current into the earth.

[0009] To solve the above technical problems, the present invention provides the following technical solutions:

[0010] A self-checking switchgear after locking, comprising a cabinet body, a circuit breaker and a self-checking sensor. The circuit breaker is installed inside the cabinet body, and the self-checking sensor is installed on the surface of the cabinet body. It further includes: a triggering mechanism, a forced circuit-breaking mechanism and a grounding mechanism. The triggering mechanism is installed at the bottom of the circuit breaker, the forced circuit-breaking mechanism is installed inside the circuit breaker, and the grounding mechanism is installed at the bottom of the circuit breaker. The triggering mechanism is connected to the forced circuit-breaking mechanism and the grounding mechanism. When the self-checking sensor monitors partial discharge of the switchgear, the triggering mechanism can first control the forced circuit-breaking mechanism to cut off the circuit of the circuit breaker, and then control the grounding mechanism to ground the switchgear.

[0011] Since the discharge components of the switchgear are enclosed in a metal shell, it is difficult for the self-checking sensor to penetrate deep into the switchgear. Therefore, it is installed on the surface of the cabinet body. The specific sensor can be selected according to the actual situation, such as ultrasonic sensors, electromagnetic wave sensors, infrared thermal imaging sensors, etc.

[0012] As a preferred solution of the self-checking switchgear after locking of the present invention, wherein: an installation plate is provided at the bottom of the circuit breaker, and an installation groove is formed inside the installation plate for installing the triggering mechanism. The triggering mechanism includes a motor, a push plate and a triggering component. The motor is electrically connected to the self-checking sensor. The push plate is fixed to the output end of the motor and is slidably arranged in the installation groove. The triggering component is installed above the push plate.

[0013] After the self-checking sensor detects partial discharge in the switchgear, it transmits a signal to the motor. After receiving the signal, the output shaft of the motor extends out, pushing the push plate to move, so that the triggering component contacts the forced circuit-breaking mechanism and the grounding mechanism successively, disconnects the circuit and connects the cabinet body to the earth.

[0014] As a preferred solution of the self-checking switchgear after locking of the present invention, wherein: the triggering component includes a fixed block, a sliding rod, a spring, a slider and a limiting block. The fixed block is fixedly installed on the upper surface of the push plate. The sliding rod slidably passes through the fixed block, and one end of it is connected to the slider. The spring is sleeved on one end of the sliding rod close to the slider. The slider is slidably arranged on the push plate. The limiting block is installed above the fixed block and the slider, and one end of it is hinged to the fixed structure on the push plate, and the other end contacts the fixed block or the slider.

[0015] The fixed block can slide together with the push plate. Under the limitation of the limit block, the slider first stays in its original position, and then the fixed block presses against and lifts the limit block, making the limit block unable to limit the slider, and the slider can quickly pop out under the action of the spring.

[0016] As a preferred solution of the self-checking switchgear cabinet after locking of the present invention, wherein: smooth push rods are vertically installed on both sides of the push plate, a main shaft for controlling opening and closing is arranged inside the circuit breaker, and the forced breaking mechanism is installed on the main shaft, including a connecting plate and a cross bar. One end of the connecting plate is connected to the main shaft, and the other end is connected to the cross bar. Rotating wheels are installed at both ends of the cross bar, and the rotating wheels can be in contact with the push rods.

[0017] The smooth push rods and the rotating wheels can reduce the friction between the push rods and the cross bar. When the push rods slide along with the push plate, the rotating wheels roll, and the push rods push the cross bar to drive the connecting plate to deflect, thereby driving the main shaft to rotate. The main shaft drives the connecting rod inside the circuit breaker to displace, so that the internal contacts of the circuit breaker are disconnected, achieving power-off of the equipment.

[0018] As a preferred solution of the self-checking switchgear cabinet after locking of the present invention, wherein: one side of the top of the fixed block close to the limit block is an inclined surface, one end of the slider close to the fixed block is a convex end, the free end of the limit block is an inclined surface, and a clamping block is arranged on its lower side. The height difference between the fixed block and the slider is greater than the length of the clamping block, ensuring that when the fixed block presses against and lifts the limit block, the limit block no longer blocks the movement of the slider, enabling the slider to pop out smoothly.

[0019] As a preferred solution of the self-checking switchgear cabinet after locking of the present invention, wherein: the grounding mechanism includes a moving contact and a static contact. The moving contact is rotatably installed inside the cabinet, including a control end and a connecting end. The control end is located on one side of the slider, and the connecting end is located below the control end. The static contact is fixed below the circuit breaker and connected with a grounding wire. A clamping interface is opened on one side of it close to the connecting end, and the connecting end can be in contact connection with the clamping interface.

[0020] After the slider pops out, it contacts the control end, pushing the control end to deflect, thereby driving the connecting end to deflect upward and screwing into the position of the clamping interface opened on the static contact, thereby realizing grounding.

[0021] First, the push rods push the cross bar to drive the main shaft to rotate, making the circuit breaker power off first. At this time, the slider that can touch the grounding mechanism is still limited by the limit block and cannot move. After the power-off is completed, the fixed block pushes the limit block to release the limit on the slider, and the slider pops out and hits the control end to make it deflect, further connecting the moving contact and the static contact, realizing automatic power-off first and then grounding, avoiding current passing through the grounding wire when grounding first and then power-off, causing electric shock accidents or equipment damage, and affecting the maintenance work.

[0022] As a preferred embodiment of the self-checking switch cabinet after locking of the present invention, wherein: the outer surface of the push plate is made of insulating material, and a buffer pad is installed on one side of the slider close to the control end, and the buffer pad is made of insulating rubber material.

[0023] Avoid the current of internal discharge passing through the push plate to the motor, affecting the use of the motor and causing damage to the motor.

[0024] As a preferred embodiment of the self-checking switch cabinet after locking of the present invention, wherein: an audible and visual alarm is provided on the cabinet body, and the audible and visual alarm is electrically connected to the self-checking sensor.

[0025] When the audible and visual alarm receives the signal from the self-checking sensor, it can give an audible and visual alarm to remind the nearby personnel to discover and perform maintenance in time.

[0026] As a preferred embodiment of the self-checking switch cabinet after locking of the present invention, wherein: the audible and visual alarm includes an installation part and a warning part. The installation part includes a pulley fixed inside the cabinet body, a connecting rope is wound around the pulley, one end of the connecting rope is connected to the push rod, and the other end is connected to the warning part. The warning part is slidably arranged on one side of the cabinet body close to the cabinet door, and a light-transmitting plate is arranged at the position of the cabinet door corresponding to the warning part.

[0027] As a preferred embodiment of the self-checking switch cabinet after locking of the present invention, wherein: the light-transmitting plate is rotatably installed on the cabinet door, and its upper side is hinged to the cabinet door, and the warning part can extend through the installation position of the light-transmitting plate to the surface of the cabinet door.

[0028] When there is no partial discharge, the audible and visual alarm is installed inside the cabinet body, which does not affect the neatness and beauty of the outer facade of the cabinet. When a partial discharge occurs, the push rod moves to pull the connecting rope, so that the warning part connected to the other end of the connecting rope slides and extends outside the cabinet body for audible and visual alarm, making the warning more obvious and easier to be observed.

[0029] Advantages of the present invention:

[0030] 1. After the self-checking sensor detects the partial discharge situation, it transmits to the motor, automatically triggers the opening of the circuit breaker through the triggering mechanism, then grounds the cabinet body, timely cuts off the power supply of the equipment, avoids the combustion or damage of the equipment, and grounds after power-off, ensuring the safety of the subsequent maintenance staff.

[0031] 2. The triggering mechanism drives the audible and visual alarm to extend outside the cabinet body, making the audible and visual alarm more obvious, so that the nearby staff can discover and perform maintenance in time. Description of the drawings

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings. Among them:

[0033] Figure 1 It is a schematic diagram of the overall structure of the self-checking switch cabinet after locking of the present invention.

[0034] Figure 2 is Figure 1 an enlarged view of part A.

[0035] Figure 3 is Figure 1 an enlarged view of part B.

[0036] Figure 4 It is a schematic diagram of the connection between the trigger mechanism, the forced disconnection mechanism and the grounding mechanism of the present invention.

[0037] Figure 5 It is a schematic diagram of the connection between the trigger mechanism, the forced disconnection mechanism and the grounding mechanism of the present invention from another angle.

[0038] In the figure: 1, cabinet body; 11, audible and visual alarm; 111, installation part; 111a, pulley; 111b, connecting rope; 112, warning part; 12, cabinet door; 121, light-transmitting plate; 2, circuit breaker; 21, mounting plate; 22, mounting groove; 23, main shaft; 3, self-checking sensor; 4, trigger mechanism; 41, motor; 42, push plate; 421, push rod; 43, trigger component; 431, fixed block; 432, sliding rod; 433, spring; 434, slider; 434a, protruding end; 434b, buffer pad; 435, limiting block; 435a, clamping block; 5, forced disconnection mechanism; 51, connecting plate; 52, cross bar; 521, runner; 6, grounding mechanism; 61, moving contact; 611, control end; 612, connecting end; 62, static contact; 621, card interface. Specific embodiments

[0039] To make the above objects, features and advantages of the present invention more obvious and understandable, the following will make a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings of the specification.

[0040] In the following description, many specific details are set forth in order to fully understand the present invention. However, the present invention can also be implemented in other ways different from those described herein. Those skilled in the art can make similar generalizations without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed below.

[0041] Secondly, the so-called "one embodiment" or "embodiment" herein refers to specific features, structures, or characteristics that may be included in at least one implementation of the present invention. The appearances of "in one embodiment" in different places in this specification do not all refer to the same embodiment, nor are they separate or alternative embodiments that are mutually exclusive of other embodiments.

[0042] Thirdly, the present invention is described in detail in conjunction with schematic diagrams. When detailing the embodiments of the present invention, for the sake of convenience of explanation, the cross-sectional views showing the device structure will be enlarged locally out of the general proportion, and the schematic diagrams are only examples and should not limit the scope of protection of the present invention herein. In addition, in actual production, three-dimensional spatial dimensions including length, width, and depth should be included.

[0043] Please refer to Figures 1 to 5 , the present invention provides a locked self-checking switchgear, and the technical solution is as follows:

[0044] Referring to Figure 1 , a locked self-checking switchgear includes a cabinet body 1, a circuit breaker 2, and a self-checking sensor 3. The circuit breaker 2 is installed inside the cabinet body 1, and the self-checking sensor 3 is installed on the surface of the cabinet body 1. It is characterized in that it further includes: a triggering mechanism 4, a forced open circuit mechanism 5, and a grounding mechanism 6. The triggering mechanism 4 is installed at the bottom of the circuit breaker 2, the forced open circuit mechanism 5 is installed inside the circuit breaker 2, and the grounding mechanism 6 is installed at the bottom of the circuit breaker 2. The triggering mechanism 4 is connected to the forced open circuit mechanism 5 and the grounding structure. When the self-checking sensor 3 detects partial discharge in the switchgear, the triggering mechanism 4 can first control the forced open circuit mechanism 5 to open the circuit breaker 2, and then control the grounding mechanism 6 to ground the switchgear.

[0045] Since the discharge components of the switchgear are enclosed in a metal shell, it is difficult for the self-checking sensor 3 to penetrate deep into the switchgear. Therefore, it is installed on the surface of the cabinet body 1. The specific sensor selection can be made according to the actual situation, such as ultrasonic sensors, electromagnetic wave sensors, infrared thermal imaging sensors, etc.

[0046] Referring to Figure 1 and Figure 2 , an installation plate 21 is provided at the bottom of the circuit breaker 2, and an installation groove 22 is opened in the installation plate 21. The triggering mechanism 4 includes a motor 41, a push plate 42, and a triggering component 43. The motor 41 is electrically connected to the self-checking sensor 3. The push plate 42 is fixed to the output end of the motor 41 and is slidably arranged in the installation groove 22. The triggering component 43 is installed above the push plate 42.

[0047] After the self-checking sensor 3 detects the existence of partial discharge in the switchgear, it transmits a signal to the motor 41. After receiving the signal, the output shaft of the motor 41 extends out, pushing the push plate 42 to move, so that the triggering component 43 contacts the forced open circuit mechanism 5 and the grounding mechanism 6 in sequence, disconnects the circuit, and connects the cabinet body 1 to the ground.

[0048] Reference Figure 2 and Figure 3 Figure 3 , the triggering component 43 includes a fixed block 431, a sliding rod 432, a spring 433, a slider 434 and a limiting block 435. The fixed block 431 is fixedly installed on the upper surface of the push plate 42. The sliding rod 432 slides through the fixed block 431, and one end of it is connected to the slider 434. The spring 433 is sleeved on one end of the sliding rod 432 close to the slider 434. The slider 434 is slidably arranged on the push plate 42. The limiting block 435 is installed above the fixed block 431 and the slider 434. One end of it is hinged to the fixed structure on the push plate 42, and the other end is in contact with the fixed block 431 or the slider 434.

[0049] The fixed block 431 can slide together with the push plate 42. Under the limitation of the limiting block 435, the slider 434 stays at the original position first, and then the fixed block 431 presses against and lifts the limiting block 435, so that the limiting block 435 cannot limit the slider 434, and the slider 434 can quickly pop out under the action of the spring 433.

[0050] The smooth push rod 421 and the runner 521 can reduce the friction between the push rod 421 and the cross bar 52. When the push rod 421 slides with the push plate 42, the runner 521 rolls, and the push rod 421 pushes the cross bar 52 to drive the connecting plate 51 to deflect, thereby driving the main shaft 23 to rotate. The main shaft 23 drives the connecting rod inside the circuit breaker 2 to displace, so that the internal contacts of the circuit breaker 2 are disconnected, achieving power-off of the equipment.

[0051] Reference Figure 2 and Figure 3 Figure 3 , smooth push rods 421 are vertically installed on both sides of the push plate 42. A main shaft 23 for controlling opening and closing is arranged inside the circuit breaker 2. The forced opening mechanism 5 is installed on the main shaft 23 and includes a connecting plate 51 and a cross bar 52. One end of the connecting plate 51 is connected to the main shaft 23, and the other end is connected to the cross bar 52. Runners 521 are installed at both ends of the cross bar 52, and the runners 521 can be in contact with the push rods 421.

[0052] Reference Figure 5 Figure 5 , one side of the top of the fixed block 431 close to the limiting block 435 is an inclined surface. One end of the slider 434 close to the fixed block 431 is a convex end 434a. The free end of the limiting block 435 is an inclined surface, and a clamping block 435a is arranged on its lower side. The height difference between the fixed block 431 and the slider 434 is greater than the length of the clamping block 435a.

[0053] The grounding mechanism 6 includes a moving contact 61 and a static contact 62. The moving contact 61 is rotatably installed inside the cabinet body 1 and includes a control end 611 and a connecting end 612. The control end 611 is located on one side of the slider 434, and the connecting end 612 is located below the control end 611. The static contact 62 is fixed below the circuit breaker 2 and is connected with a grounding wire. A clamping interface 621 is provided on one side thereof close to the connecting end 612, and the connecting end 612 can be in contact connection with the clamping interface 621.

[0054] After the slider 434 pops out, it contacts the control end 611, pushing the control end 611 to deflect, thereby driving the connecting end 612 to deflect upward and screwing into the position of the clamping interface 621 provided on the static contact 62, thereby realizing grounding.

[0055] The push rod 421 first pushes the cross bar 52 to drive the main shaft 23 to rotate, so that the circuit breaker 2 is powered off first. At this time, the slider 434 that can touch the grounding mechanism 6 is still limited by the limit block 435 and cannot move. When the power off is completed, the fixed block 431 pushes the limit block 435 to release the limit on the slider 434. The slider 434 pops out and impacts the control end 611 to make it deflect, and then the moving contact 61 is connected to the static contact 62, realizing automatic grounding after power off first, avoiding current passing through the grounding wire when grounding first and then power off, causing electric shock accidents or equipment damage and affecting the maintenance work.

[0056] The outer surface of the push plate 42 is made of insulating material, and a buffer pad 434b is installed on one side of the slider 434 close to the control end 611. The buffer pad 434b is made of insulating rubber material.

[0057] Avoid the current of internal discharge passing through the push plate 42 to the motor 41, affecting the use of the motor 41 and causing damage to the motor 41.

[0058] Refer to Figure 1 and Figure 4 As shown in, an audible and visual alarm 11 is provided on the cabinet body 1. The audible and visual alarm 11 is electrically connected to the self-checking sensor 3. When the audible and visual alarm 11 receives the signal from the self-checking sensor 3, it can give an audible and visual alarm to remind the nearby personnel to discover and perform maintenance in time.

[0059] When the audible and visual alarm 11 receives the signal from the self-checking sensor 3, it can give an audible and visual alarm to remind the nearby personnel to discover and perform maintenance in time.

[0060] Refer to Figure 4, the acoustic-optic alarm 11 includes a pulley 111 and a warning part 112. The pulley 111 includes a pulley 111a fixed inside the cabinet 1. A connecting rope 111b is wound around the pulley 111a. One end of the connecting rope 111b is connected to the push rod 421, and the other end is connected to the warning part 112. The warning part 112 is slidably arranged on one side of the cabinet 1 close to the cabinet door 12. A light-transmitting plate 121 is arranged at the position of the cabinet door 12 corresponding to the warning part 112.

[0061] The light-transmitting plate 121 is rotatably installed on the cabinet door 12, and its upper side is hinged to the cabinet door 12. The warning part 112 can extend through the installation position of the light-transmitting plate 121 to the surface of the cabinet door 12.

[0062] When there is no partial discharge, the acoustic-optic alarm 11 is installed inside the cabinet 1, which does not affect the neatness and beauty of the outer facade of the cabinet 1. When a partial discharge occurs, the push rod 421 moves to pull the connecting rope 111b, so that the warning part 112 connected to the other end of the connecting rope 111b slides and extends outside the cabinet 1 for acoustic-optic alarm, making the warning more obvious and easier to observe.

[0063] In summary, the self-checking sensor 3 detects the internal discharge condition of the cabinet 1. When there is a partial discharge in the switch cabinet, the self-checking sensor 3 sends signals in two directions. One is to send a signal to the motor 41. The output end of the motor 41 extends to push the push plate 42, so that the trigger assembly 43 installed on the push plate 42 contacts the forced open circuit mechanism 5 and the grounding mechanism 6 successively. After disconnecting the circuit, the cabinet 1 is connected to the ground. The specific process is as follows: The push rod 421 first pushes the cross bar 52 to drive the main shaft 23 to rotate, so that the circuit breaker 2 is powered off first. At this time, the slider 434 that can touch the grounding mechanism 6 is still limited by the limit block 435 and cannot move. When the power-off is completed, the fixed block 431 pushes the limit block 435 to release the limit on the slider 434, and the slider 434 pops out to hit the control end 611 to deflect it, and then the moving contact 61 is connected to the static contact 62. The other is to send a signal to the acoustic-optic alarm 11 to make the acoustic-optic alarm 11 emit an acoustic-optic alarm. At the same time, when a partial discharge occurs, the push rod 421 moves to pull the connecting rope 111b, so that the warning part 112 connected to the other end of the connecting rope 111b slides and extends outside the cabinet 1 for acoustic-optic alarm, making the warning more obvious and easier to observe.

[0064] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A self-checking switchgear cabinet after locking, comprising a cabinet body (1), a circuit breaker (2) and a self-checking sensor (3), wherein the circuit breaker (2) is installed in the cabinet body (1), and the self-checking sensor (3) is installed on the surface of the cabinet body (1), characterized in that, It further includes: a triggering mechanism (4), a forced opening mechanism (5) and a grounding mechanism (6). The triggering mechanism (4) is installed at the bottom of the circuit breaker (2), the forced opening mechanism (5) is installed inside the circuit breaker (2), and the grounding mechanism (6) is installed at the bottom of the circuit breaker (2). The triggering mechanism (4) is connected to the forced opening mechanism (5) and the grounding mechanism (6). When the self-checking sensor (3) detects partial discharge in the switch cabinet, the triggering mechanism (4) can first control the forced opening mechanism (5) to open the circuit breaker (2), and then control the grounding mechanism (6) to ground the switch cabinet.

2. A self-checking switch cabinet after locking, characterized in that: An installation plate (21) is provided at the bottom of the circuit breaker (2). An installation groove (22) is formed in the installation plate (21). The triggering mechanism (4) includes a motor (41), a push plate (42) and a triggering component (43). The motor (41) is electrically connected to the self-checking sensor (3). The push plate (42) is fixed to the output end of the motor (41) and is slidably arranged in the installation groove (22). The triggering component (43) is installed above the push plate (42).

3. The self-checking switch cabinet after locking according to claim 2, characterized in that: The triggering component (43) includes a fixed block (431), a sliding rod (432), a spring (433), a slider (434) and a limiting block (435). The fixed block (431) is fixedly installed on the upper surface of the push plate (42). The sliding rod (432) slidably passes through the fixed block (431), and one end thereof is connected to the slider (434). The spring (433) is sleeved on one end of the sliding rod (432) close to the slider (434). The slider (434) is slidably arranged on the push plate (42). The limiting block (435) is installed above the fixed block (431) and the slider (434). One end thereof is hinged to the fixed structure on the push plate (42), and the other end is in contact with the fixed block (431) or the slider (434).

4. The self-checking switch cabinet after locking according to claim 3, characterized in that: Smooth push rods (421) are vertically installed on both sides of the push plate (42). A main shaft (23) for controlling opening and closing is arranged inside the circuit breaker (2). The forced opening mechanism (5) is installed on the main shaft (23) and includes a connecting plate (51) and a cross bar (52). One end of the connecting plate (51) is connected to the main shaft (23), and the other end is connected to the cross bar (52). Rotating wheels (521) are installed at both ends of the cross bar (52), and the rotating wheels (521) can be in contact with the push rods (421).

5. The self-checking switch cabinet after locking according to claim 2 or 3, characterized in that: One side of the top of the fixed block (431) close to the limiting block (435) is an inclined surface. One end of the slider (434) close to the fixed block (431) is a convex end (434a). The free end of the limiting block (435) is an inclined surface, and a clamping block (435a) is arranged on the lower side thereof. The height difference between the fixed block (431) and the slider (434) is greater than the length of the clamping block (435a).

6. The self-checking switch cabinet after locking according to claim 3, wherein: The grounding mechanism (6) includes a moving contact (61) and a static contact (62). The moving contact (61) is rotatably installed inside the cabinet body (1) and includes a control end (611) and a connection end (612). The control end (611) is located on one side of the slider (434), and the connection end (612) is located below the control end (611). The static contact (62) is fixed below the circuit breaker (2) and is connected with a grounding wire. A clamping interface (621) is formed on one side thereof close to the connection end (612), and the connection end (612) can be in contact connection with the clamping interface (621).

7. The self-checking switch cabinet after locking according to claim 6, characterized in that: The outer surface of the push plate (42) is made of insulating material. A buffer pad (434b) is installed on one side of the slider (434) close to the control end (611), and the buffer pad (434b) is made of insulating rubber material.

8. The post-locking self-checking switch cabinet according to claim 6 or 7, characterized in that: An audible and visual alarm (11) is arranged on the cabinet body (1), and the audible and visual alarm (11) is electrically connected with the self-checking sensor (3).

9. The self-checking switchgear cabinet after locking according to claim 8, wherein: The audible and visual alarm (11) includes an installation part (111) and a warning part (112). The installation part (111) includes a pulley (111a) fixed inside the cabinet body (1). A connecting rope (111b) is wound around the pulley (111a). One end of the connecting rope (111b) is connected with the push rod (421), and the other end is connected with the warning part (112). The warning part (112) is slidably arranged on one side of the cabinet body (1) close to the cabinet door (12). A light-transmitting plate (121) is arranged at the position of the cabinet door (12) corresponding to the warning part (112).

10. The self-checking switch cabinet after locking according to claim 9, characterized in that: The light-transmitting plate (121) is rotatably installed on the cabinet door (12), and its upper side is hinged to the cabinet door (12). The warning part (112) can extend to the surface of the cabinet door (12) through the installation position of the light-transmitting plate (121).

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