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 invention relates to the technical field of high and low voltage cabinets, and in particular to a self-checking switch cabinet after locking. Background Art

[0002] Partial discharge (PD) in switchgear refers to the local electrical discharge phenomenon that occurs inside the switchgear or in its insulation system. In switchgear, PD refers to the local electrical discharge phenomenon that occurs under high voltage due to insulation defects or inhomogeneities. This discharge usually does not immediately cause insulation breakdown of the entire system, but it will produce local high-energy discharges, leading to gradual damage to the insulation material. The occurrence of PD in the switchgear may cause the gradual degradation of the insulation material, and ultimately may lead to insulation failure and electrical faults. Therefore, it is very important to monitor and detect PD in switchgear.

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

[0004] However, since it is handled by technical workers, there is a certain time difference from discovery to power off, which can easily lead to untimely handling of local discharge problems, resulting in the degradation of the insulation performance of the insulating materials inside the switch cabinet and unstable changes in the electrical parameters inside the switch cabinet. The arc discharge caused by local discharge may also generate high temperature, strong light and harmful gases, and may even cause fire in severe cases.

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

[0006] The purpose of this section is to summarize some aspects of embodiments of the present invention and briefly introduce some preferred embodiments. Some simplifications or omissions may be made in this section and the specification abstract and the invention title of this application to avoid blurring the purpose of this section, the specification abstract and the invention 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 switch cabinet fails to manually cut off the power in time after detecting partial discharge, the present invention is proposed.

[0008] Therefore, the purpose of the present invention is to provide a self-checking switch cabinet after locking, which aims to disconnect the circuit in time to stop the relevant equipment from working after detecting partial discharge of the switch cabinet, and to ground the switch cabinet to introduce the current into the earth.

[0009] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0010] A post-lock self-checking switch cabinet comprises a cabinet body, a circuit breaker and a self-checking sensor, wherein the circuit breaker is installed in the cabinet body, and the self-checking sensor is installed on the cabinet body surface; the switch cabinet also comprises: a trigger mechanism, a forced circuit breaking mechanism and a grounding mechanism, wherein the trigger 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 trigger mechanism is connected with the forced circuit breaking mechanism and the grounding mechanism, and when the self-checking sensor detects partial discharge of the switch cabinet, the trigger mechanism can first control the forced circuit breaking mechanism to make the circuit breaker break, and then control the grounding mechanism to ground the switch cabinet.

[0011] Since the discharge components of the switch cabinet are enclosed in a metal shell, it is difficult for the self-test sensor to penetrate deep into the switch equipment, so it is set on the surface of the cabinet. The specific sensor can be selected according to actual conditions, such as ultrasonic sensors, electromagnetic wave sensors, infrared thermal imaging sensors, etc.

[0012] As a preferred solution of the locked self-checking switch cabinet of the present invention, a mounting plate is provided at the bottom of the circuit breaker, a mounting groove is provided in the mounting plate for installing a trigger mechanism, the trigger mechanism comprises a motor, a push plate and a trigger assembly, the motor is electrically connected to the self-checking sensor, the push plate is fixed to the output end of the motor and slidably arranged in the mounting groove, and the trigger assembly is installed above the push plate.

[0013] After the self-test sensor detects partial discharge in the switch cabinet, it transmits the signal to the motor. After receiving the signal, the output shaft of the motor extends, pushing the push plate to move, so that the trigger component contacts the forced circuit breaking mechanism and the grounding mechanism in turn, disconnecting the circuit and connecting the cabinet to the ground.

[0014] As a preferred solution of the locked self-checking switch cabinet of the present invention, the trigger assembly includes a fixed block, a sliding rod, a spring, a slider and a limit block, the fixed block is fixedly installed on the upper surface of the push plate, the sliding rod slides through the fixed block, one end of which 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 limit block is installed above the fixed block and the slider, one end of which is hinged to the fixed structure on the push plate, and the other end is in contact with the fixed block or the slider.

[0015] The fixed block can slide with the push plate. Under the limit of the limit block, the slider first stays in the original position, and then the fixed block resists and lifts the limit block, so that the limit block cannot limit the slider, and the slider can be quickly popped out under the action of the spring.

[0016] As a preferred solution of the locked self-checking switch cabinet of the present invention, smooth push rods are vertically installed on both sides of the push plate, a main shaft for controlling opening and closing of the circuit breaker is arranged inside the circuit breaker, and the forced circuit 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, and rotating wheels are installed at both ends of the cross bar, and the rotating wheels can contact the push rods.

[0017] The smooth push rod and rotating wheel can reduce the friction between the push rod and the cross bar. When the push rod slides with the push plate, the rotating wheel rolls, and the push rod pushes the cross bar to cause the connecting plate to deflect, thereby driving the main shaft to rotate. The main shaft drives the connecting rod inside the circuit breaker to move, thereby disconnecting the contacts inside the circuit breaker and achieving power-off of the equipment.

[0018] As a preferred solution of the locked self-checking switch cabinet of the present invention, the top of the fixed block has a side close to the limit block as an inclined surface, the end of the slider close to the fixed block is a raised end, the free end of the limit block is an inclined surface, and a locking block is arranged on the lower side thereof, and the height difference between the fixed block and the slider is greater than the length of the locking block, so as to ensure that when the fixed block is against and lifts the limit block, the limit block no longer blocks the movement of the slider, so that the slider can be ejected smoothly.

[0019] As a preferred solution of the locked self-checking switch cabinet of the present invention, the grounding mechanism includes a moving contact and a static contact, the moving contact is rotatably installed in the cabinet, and includes 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 to a grounding wire, and a card interface is provided on one side close to the connecting end, and the connecting end can be contacted and connected with the card interface.

[0020] After the slider pops out, it contacts the control end, pushing the control end to deflect, thereby driving the connection end to deflect upward and rotate into the card interface position opened on the static contact, thereby achieving grounding.

[0021] The push rod first pushes the cross bar to drive the main shaft to rotate, so that the circuit breaker is powered on first. At this time, the slider that can touch the grounding mechanism is still limited by the limit block and cannot move. When the power is off, the fixed block pushes the limit block to release the limit on the slider. The slider pops out and hits the control end to deflect it, thereby connecting the moving contact with the static contact, realizing automatic power off before grounding, avoiding grounding before power off, causing current to pass through the grounding wire, causing electric shock accidents or equipment damage, and affecting maintenance work.

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

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

[0024] As a preferred solution of the locked self-checking switch cabinet of the present invention, an audible and visual alarm is arranged on the cabinet body, and the audible and visual alarm is electrically connected to the self-checking sensor.

[0025] When the sound and light alarm receives the signal from the self-test sensor, it can send out a sound and light alarm to remind nearby personnel to discover and repair it in time.

[0026] As a preferred solution of the locked self-checking switch cabinet of the present invention, the sound and light alarm includes an installation part and a warning part, the installation part includes a pulley fixed inside the cabinet, 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 the position corresponding to the cabinet door and the warning part is set as a light-transmitting plate.

[0027] As a preferred solution of the locked self-checking switch cabinet of the present invention, the light-transmitting plate is rotatably mounted 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 cabinet door surface.

[0028] When no partial discharge occurs, the sound and light alarm is installed inside the cabinet and does not affect the neatness and beauty of the cabinet facade. When partial discharge occurs, the push rod moves and pulls the connecting rope, causing the warning part connected to the other end of the connecting rope to slide and extend to the outside of the cabinet to sound and light alarm, making the warning more obvious and easier to observe.

[0029] Beneficial effects of the present invention:

[0030] 1. After the partial discharge is detected by the self-test sensor, it is transmitted to the motor, and the circuit breaker is automatically triggered by the trigger mechanism. Then the cabinet is grounded, and the power supply of the equipment is disconnected in time to avoid burning or damage to the equipment. After the power is off, the equipment is grounded to ensure the safety of the subsequent maintenance staff.

[0031] 2. The trigger mechanism drives the sound and light alarm to extend to the outside of the cabinet, making the sound and light alarm more obvious, so that nearby staff can find it in time and carry out maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative labor. Among them:

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

[0034] Figure 2 for Figure 1 Enlarged view of point A.

[0035] Figure 3 for Figure 1 Enlarged view of point B.

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

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

[0038] In the figure: 1. cabinet; 11. sound and light alarm; 111. installation part; 111a. pulley; 111b. connecting rope; 112. warning part; 12. cabinet door; 121. light-transmitting plate; 2. circuit breaker; 21. installation plate; 22. installation slot; 23. main shaft; 3. self-test sensor; 4. trigger mechanism; 41. motor; 42. push plate; 421. push rod; 43. trigger assembly; 431. fixed block; 432. sliding rod; 433. spring; 434. slider; 434a. raised end; 434b. buffer pad; 435. limit block; 435a. card block; 5. forced circuit breaking mechanism; 51. connecting plate; 52. cross bar; 521. rotating wheel; 6. grounding mechanism; 61. moving contact; 611. control end; 612. connecting end; 62. static contact; 621. card interface. DETAILED DESCRIPTION

[0039] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0040] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0041] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0042] Secondly, the present invention is described in detail with reference to the schematic diagram. When describing the embodiments of the present invention in detail, for the sake of convenience, the cross-sectional diagrams showing the device structure will not be partially enlarged according to the general scale, and the schematic diagrams are only examples, which should not limit the scope of protection of the present invention. In addition, in actual production, the three-dimensional dimensions of length, width and depth should be included.

[0043] See also Figures 1 to 5 The present invention provides a self-checking switch cabinet after locking, and the technical solution is as follows:

[0044] Reference Figure 1 A post-lock self-checking switch cabinet comprises a cabinet body 1, a circuit breaker 2 and a self-checking sensor 3, 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. It is characterized in that it also comprises: a trigger mechanism 4, a forced circuit breaking mechanism 5 and a grounding mechanism 6, the trigger mechanism 4 is installed at the bottom of the circuit breaker 2, the forced circuit breaking 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 trigger mechanism 4 is connected to the forced circuit breaking mechanism 5 and the grounding structure. When the self-checking sensor 3 detects partial discharge of the switch cabinet, the trigger mechanism 4 can first control the forced circuit breaking mechanism 5 to break the circuit breaker 2, and then control the grounding mechanism 6 to ground the switch cabinet.

[0045] Since the discharge components of the switch cabinet are enclosed in a metal shell, it is difficult for the self-test sensor 3 to penetrate into the interior of the switch device, so it is set on the surface of the cabinet 1. The specific sensor can be selected according to actual conditions, such as ultrasonic sensors, electromagnetic wave sensors, infrared thermal imaging sensors, etc.

[0046] Reference Figure 1 and Figure 2 A mounting plate 21 is provided at the bottom of the circuit breaker 2, and a mounting groove 22 is provided in the mounting plate 21. The trigger mechanism 4 includes a motor 41, a push plate 42 and a trigger assembly 43. The motor 41 is electrically connected to the self-test sensor 3. The push plate 42 is fixed to the output end of the motor 41 and slidably disposed in the mounting groove 22. The trigger assembly 43 is installed above the push plate 42.

[0047] After the self-test sensor 3 detects partial discharge in the switch cabinet, it transmits a signal to the motor 41. After receiving the signal, the output shaft of the motor 41 extends, pushing the push plate 42 to move, so that the trigger component 43 contacts the forced circuit breaking mechanism 5 and the grounding mechanism 6 in turn, disconnecting the circuit and connecting the cabinet body 1 to the ground.

[0048] Reference Figure 2 and Figure 3 The trigger assembly 43 includes a fixed block 431, a sliding rod 432, a spring 433, a slider 434 and a limit 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 the sliding rod 432 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 set on the push plate 42. The limit block 435 is installed above the fixed block 431 and the slider 434. One end of the limit block 435 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 along with the push plate 42. The slider 434 stays at the original position under the limit of the limit block 435. Then the fixed block 431 presses against and lifts the limit block 435, so that the limit block 435 cannot limit the slider 434. The slider 434 can be quickly popped out under the action of the spring 433.

[0050] The smooth push rod 421 and the rotating wheel 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 rotating wheel 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, and the main shaft 23 drives the connecting rod inside the circuit breaker 2 to move, so that the contacts inside the circuit breaker 2 are disconnected, and the equipment is powered off.

[0051] Reference Figure 2 and Figure 3 Smooth push rods 421 are vertically installed on both sides of the push plate 42. A main shaft 23 for controlling the opening and closing of the circuit breaker 2 is arranged inside. The forced circuit breaking mechanism 5 is installed on the main shaft 23, including 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 contact with the push rod 421.

[0052] Reference Figure 5 The top of the fixed block 431 is close to the limiting block 435 and has an inclined surface. The end of the sliding block 434 close to the fixed block 431 is a raised end 434a. The free end of the limiting block 435 is an inclined surface, and a locking block 435a is provided on its lower side. The height difference between the fixed block 431 and the sliding block 434 is greater than the length of the locking block 435a.

[0053] The grounding mechanism 6 includes a moving contact 61 and a static contact 62. The moving contact 61 is rotatably installed in the cabinet 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 to a grounding wire. A card interface 621 is provided on one side close to the connection end 612, and the connection end 612 can be in contact with and connected to the card 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 connection end 612 to deflect upward and rotate into the position of the card interface 621 provided on the static contact 62, thereby achieving 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 is off, the fixed block 431 pushes the limit block 435 to release the limit on the slider 434. The slider 434 pops out and hits the control end 611 to deflect it, thereby connecting the moving contact 61 with the static contact 62, realizing automatic power off before grounding, avoiding grounding before power off so that the current passes through the grounding wire, causing electric shock accidents or equipment damage, affecting maintenance work.

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

[0057] The current of internal discharge is prevented from passing through the push plate 42 to the motor 41 , thereby affecting the use of the motor 41 and causing damage to the motor 41 .

[0058] Reference Figure 1 and Figure 4 The cabinet 1 is provided with an audible and visual alarm 11, which is electrically connected to the self-test sensor 3. When the audible and visual alarm 11 receives a signal from the self-test sensor 3, it can send out an audible and visual alarm to remind nearby personnel to find and repair in time.

[0059] When the sound and light alarm 11 receives the signal from the self-test sensor 3, it can send out a sound and light alarm to remind nearby personnel to find and repair the problem in time.

[0060] Reference Figure 4The sound and light 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, and the position corresponding to the cabinet door 12 and the warning part 112 is set as a light-transmitting plate 121.

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

[0062] When no partial discharge occurs, the sound and light alarm 11 is installed inside the cabinet 1, which does not affect the neatness and beauty of the exterior of the cabinet 1. When partial discharge occurs, the push rod 421 moves and pulls the connecting rope 111b, so that the warning part 112 connected to the other end of the connecting rope 111b slides and extends to the outside of the cabinet 1 to sound and light alarm, making the warning more obvious and easier to observe.

[0063] In summary, the self-test sensor 3 detects the discharge condition inside the cabinet 1. When the switch cabinet has a partial discharge condition, the self-test sensor 3 sends a signal 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 component 43 installed on the push plate 42 successively contacts the forced circuit breaker mechanism 5 and the grounding mechanism 6. After the circuit is disconnected, the cabinet 1 is connected to the ground. The specific process is: 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 also limited by the limit block. The limit of 435 cannot be moved. When the power is off, the fixed block 431 pushes the limit block 435 to release the limit on the slider 434. The slider 434 pops out and hits the control end 611 to deflect it, thereby connecting the moving contact 61 with the static contact 62; secondly, a signal is sent to the sound and light alarm 11, causing the sound and light alarm 11 to emit a sound and light alarm. At the same time, when partial discharge occurs, the push rod 421 moves and pulls the connecting rope 111b, so that the warning part 112 connected to the other end of the connecting rope 111b slides and extends to the outside of the cabinet 1 to perform a sound and light alarm, making the warning more obvious and easier to observe.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A post-lock self-checking switch cabinet, comprising a cabinet (1), a circuit breaker (2) and a self-checking sensor (3), wherein the circuit breaker (2) is installed in the cabinet (1), and the self-checking sensor (3) is installed on the surface of the cabinet (1), characterized in that: Also includes: A trigger mechanism (4), a forced circuit breaking mechanism (5) and a grounding mechanism (6), wherein the trigger mechanism (4) is mounted at the bottom of a circuit breaker (2), the forced circuit breaking mechanism (5) is mounted inside the circuit breaker (2), and the grounding mechanism (6) is mounted at the bottom of the circuit breaker (2). The trigger mechanism (4) is connected to the forced circuit breaking mechanism (5) and the grounding mechanism (6). When the self-test sensor (3) detects partial discharge of the switch cabinet, the trigger mechanism (4) can first control the forced circuit breaking mechanism (5) to disconnect 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: A mounting plate (21) is provided at the bottom of the circuit breaker (2), a mounting groove (22) is provided in the mounting plate (21), the trigger mechanism (4) comprises a motor (41), a push plate (42) and a trigger assembly (43), the motor (41) is electrically connected to the self-test sensor (3), the push plate (42) is fixed to the output end of the motor (41) and slidably arranged in the mounting groove (22), and the trigger assembly (43) is installed above the push plate (42).

3. The locked self-checking switch cabinet according to claim 2 is characterized in that: The trigger assembly (43) comprises a fixed block (431), a sliding rod (432), a spring (433), a slider (434) and a limit block (435); the fixed block (431) is fixedly mounted on the upper surface of the push plate (42); the sliding rod (432) slides through the fixed block (431), and one end of the sliding rod 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 mounted on the push plate (42); the limit block (435) is mounted above the fixed block (431) and the slider (434), and one end of the limit block 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 locked self-checking switch cabinet according to claim 3 is characterized in that: Smooth push rods (421) are vertically installed on both sides of the push plate (42); a main shaft (23) for controlling the opening and closing of the circuit breaker (2) is arranged inside; the forced circuit breaking mechanism (5) is installed on the main shaft (23), and comprises 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 contact the push rod (421).

5. The locked self-checking switch cabinet according to claim 2 or 3, characterized in that: The top of the fixed block (431) has a side close to the limit block (435) which is an inclined surface, the end of the sliding block (434) close to the fixed block (431) is a protruding end (434a), the free end of the limit block (435) is an inclined surface, and a locking block (435a) is arranged at the lower side thereof, and the height difference between the fixed block (431) and the sliding block (434) is greater than the length of the locking block (435a).

6. The locked self-checking switch cabinet according to claim 3 is characterized in that: The grounding mechanism (6) comprises a moving contact (61) and a stationary contact (62); the moving contact (61) is rotatably mounted in the cabinet (1) and comprises a control end (611) and a connection end (612); the control end (611) is located on one side of the slider (434); the connection end (612) is located below the control end (611); the stationary contact (62) is fixed below the circuit breaker (2) and is connected to a grounding wire; a card interface (621) is provided on a side close to the connection end (612); and the connection end (612) can be in contact with and connected to the card interface (621).

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

8. The locked self-checking switch cabinet according to claim 6 or 7, characterized in that: The cabinet (1) is provided with an audible and visual alarm (11), and the audible and visual alarm (11) is electrically connected to the self-test sensor (3).

9. The locked self-checking switch cabinet according to claim 8, characterized in that: The sound and light alarm (11) comprises a mounting portion (111) and a warning portion (112); the mounting portion (111) comprises 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 portion (112); the warning portion (112) is slidably arranged on a side of the cabinet (1) close to the cabinet door (12); a light-transmitting plate (121) is arranged at a position corresponding to the cabinet door (12) and the warning portion (112).

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

Images