Anti-misoperation protection device for high-voltage power distribution cabinet

Abstract

A misoperation-preventing protection device for a high-voltage power distribution cabinet belongs to the field of electrical safety protection and comprises an electromagnetic telescopic unit, the electromagnetic telescopic unit is fixedly mounted in a cabinet body and connected in series with a normally open auxiliary contact of a circuit breaker in the high-voltage power distribution cabinet, and a spring pin is slidably connected to the cabinet body. The electromagnetic telescopic unit is used for pushing the spring pin out of the cabinet body; a safety pin is inserted between the existing load isolation switch operating mechanism and the existing isolation handle on the cabinet body, the safety pin is close to the extended spring pin, the extended spring pin is used for preventing the safety pin from being pulled out, when the normally open auxiliary contact of the circuit breaker is reset, the electromagnetic telescopic unit is powered off and retracts, the limitation on the safety pin at the existing isolation handle is relieved, and the safety pin is prevented from being pulled out. When the safety pin is not pulled out, safety accidents caused by falling of the isolation handle can be avoided, and the problem that safety accidents occur due to the fact that the isolation handle is extremely prone to falling after limitation of an electromagnet is relieved in an existing mode of limiting misoperation of a high-voltage load isolation switch operating mechanism through an electromagnetic lock is solved.

Description

Technical Field

[0001] This utility model relates to the field of electrical safety protection technology, and in particular to a high-voltage distribution cabinet protection device to prevent misoperation. Background Technology

[0002] In the factory's power supply system, the high-voltage distribution cabinet is one of the most basic pieces of equipment and is also the equipment that the on-duty personnel operate most frequently. If it is operated improperly or not in the correct switching operation sequence, it may cause damage to the equipment or even endanger the lives of the operators. The most common misoperation is: opening or closing the isolating switch under load, which has low safety performance and is prone to causing safety accidents.

[0003] Modern high-voltage switchgear typically has protective structures to prevent operator misoperation. However, older high-voltage switchgear installed in the distribution room lacks such structures. To address the issue of accidental opening and closing of disconnect switches under load, electromagnetic locks are often installed on one side of the load disconnect switch operating mechanism on existing high-voltage switchgear. These electromagnetic locks have pins that limit the operating handle, and the load disconnect switch operating mechanism has corresponding limit holes. The electromagnetic lock prevents the high-voltage load disconnect switch operating mechanism from opening under load, thus avoiding accidental opening under load and effectively protecting the components in the high-voltage switchgear as well as the personal safety of the operators.

[0004] The existing method of limiting the operation of high-voltage load disconnect switch operating mechanism by using electromagnetic locks involves the electromagnetic lock directly cooperating with the high-voltage load disconnect switch operating mechanism through a pin. After the electromagnet is released from the restriction, the disconnect handle can be operated directly. At this time, the disconnect handle is very easy to fall off automatically under the action of gravity, or a large vibration may occur at the moment the circuit breaker is closed, causing the disconnect handle to fall off and resulting in a safety accident. Utility Model Content

[0005] To address the technical problem in the existing method of limiting the operation of high-voltage load disconnect switches by electromagnetic locks, where the disconnect handle is prone to falling off and causing safety accidents after the electromagnet is released, this utility model provides a high-voltage distribution cabinet protection device to prevent misoperation.

[0006] The technical solution of this utility model is as follows:

[0007] This utility model provides a protection device to prevent misoperation of a high-voltage distribution cabinet, including an electromagnetic telescopic unit. The electromagnetic telescopic unit is fixedly installed inside the cabinet and connected in series with the normally open auxiliary contact of the circuit breaker inside the cabinet. A spring pin is slidably connected to the cabinet, and the electromagnetic telescopic unit is used to push the spring pin out of the cabinet. A safety pin is inserted between the existing load disconnect switch operating mechanism and the existing disconnect handle on the cabinet, with the safety pin close to the extended spring pin. The extended spring pin is used to prevent the safety pin from being pulled out. By connecting the electromagnetic telescopic unit in series with the normally open auxiliary contact of the circuit breaker, the electromagnetic telescopic unit can only be energized and operate when the normally open auxiliary contact of the circuit breaker is closed. At this time, the spring pin is pushed out, preventing the safety pin from being pulled out. The safety pin can prevent the load disconnect switch from being misoperated under load. When the normally open auxiliary contact of the circuit breaker resets, the electromagnetic telescopic unit is de-energized and retracts, and the spring pin resets under the action of elasticity, releasing the restriction on the safety pin at the existing disconnect handle. The existing disconnect handle can be operated by pulling out the safety pin. When the safety pin is not pulled out, it can also prevent the disconnect handle from falling and causing a safety accident.

[0008] Preferably, the cabinet has mounting holes, and a spring pin is laterally slidably disposed in the mounting holes. One end of the spring pin is close to the electromagnetic telescopic unit, and the other end of the spring pin extends outward from the cabinet. The mounting holes provide a sliding track for the spring pin, ensuring that the spring pin can stably and accurately extend laterally from the cabinet under the drive of the electromagnetic telescopic unit, reliably perform the action of blocking the safety pin, and ensure that the operation of the isolation handle is effectively restricted at the appropriate time, thus meeting the requirement of preventing misoperation.

[0009] Preferably, the existing load disconnect switch operating mechanism is fixedly installed on the cabinet, and the existing disconnect handle is rotatably connected to the existing load disconnect switch operating mechanism via a rotating shaft. The existing load disconnect switch operating mechanism has a first limiting hole, and the existing disconnect handle has two second limiting holes arranged vertically opposite each other. The two second limiting holes are used independently in conjunction with the first limiting hole. The setting of the two second limiting holes, together with the first limiting hole, can flexibly lock the position of the disconnect handle according to different working scenarios. This not only improves the convenience of operation, but also can firmly restrict the disconnect handle under various working conditions, preventing it from rotating and falling off due to accidental shaking or force, and further strengthens the safety control of the disconnect handle operation.

[0010] Preferably, the safety pin is inserted into the first and second limit holes on the coaxial axis. The coaxial installation ensures that the safety pin can firmly limit the relative rotation between the load disconnect switch operating mechanism and the disconnect handle.

[0011] Preferably, the first limiting hole is located above the rotating shaft. When the safety pin is blocked by the spring pin and cannot be pulled out, it can more effectively prevent the isolating handle from falling accidentally under the action of gravity or other external forces, thus effectively ensuring the stability of the isolating handle during the operation of the high-voltage distribution cabinet.

[0012] Preferably, the spring pin and the first limiting hole are at the same horizontal height, and the spring pin is located on one side of the first limiting hole. When the electromagnetic telescopic unit pushes out the spring pin, it can quickly and effectively prevent the safety pin from being pulled out, thereby firmly restricting the operation of the isolation handle and ensuring that the isolation handle is always in a safe locked state before the circuit breaker allows operation.

[0013] Preferably, the spring pin includes a pin body, with a baffle fixed at each end of the pin body. A spring is sleeved on the pin body. The baffles at both ends prevent the spring from detaching, ensuring stable operation of the spring and also serving as a limit, regulating the sliding path of the spring pin. The spring gives the spring pin the ability to automatically reset. When the electromagnetic telescopic unit is de-energized and retracts, the spring pin can quickly reset, ensuring the reliability of the protection device's cyclic operation.

[0014] Preferably, a baffle is fixedly provided at the end of the safety pin near the spring pin. This allows for quick insertion and removal of the safety pin while increasing the contact area between the safety pin and the spring pin, thus improving the stability of the spring pin in blocking the safety pin. Even under complex working conditions or unexpected force, the safety pin is unlikely to slide out of the blocking range of the spring pin, effectively limiting the operation of the isolation handle and further enhancing the safety and reliability of the overall device in preventing misoperation.

[0015] Preferably, the electromagnetic telescopic unit is a solenoid electromagnet structure, which can quickly generate a thrust to push out the spring pin when the normally open auxiliary contact of the circuit breaker is closed; when the contact is reset and de-energized, it can retract in time to cancel the thrust on the spring pin. It is sensitive and fast in response, small in size, and easy to install and use.

[0016] Preferably, the spring pin is perpendicular to the axis of the safety pin, so that the blocking direction of the spring pin on the safety pin is perpendicular to the insertion and removal direction of the safety pin. This can prevent the safety pin from being accidentally pulled out in the horizontal direction to the greatest extent, securely lock the isolation handle, and effectively avoid safety accidents caused by the isolation handle falling off.

[0017] As can be seen from the above technical solutions, the advantages of this utility model are:

[0018] 1. By connecting the electromagnetic expansion unit in series with the normally open auxiliary contact of the circuit breaker, the electromagnetic expansion unit can only be energized and operate when the normally open auxiliary contact of the circuit breaker is closed. At this time, the spring pin is pushed out, preventing the safety pin from being pulled out. The safety pin can prevent the load isolating switch from being operated accidentally under load. When the normally open auxiliary contact of the circuit breaker is reset, the electromagnetic expansion unit is de-energized and retracts. The spring pin is reset under the action of elasticity, releasing the restriction on the safety pin at the existing isolating handle. The existing isolating handle can be operated by pulling out the safety pin. When the safety pin is not pulled out, it can also prevent the isolating handle from falling off and causing a safety accident.

[0019] 2. The two second limit holes are used independently in conjunction with the first limit hole. The two second limit holes, together with the first limit hole, can flexibly lock the position of the isolation handle according to different working scenarios. This not only improves the convenience of operation, but also firmly restricts the isolation handle under various working conditions, preventing it from rotating and falling off due to accidental shaking or force, and further strengthens the safety control of the operation of the isolation handle.

[0020] 3. A baffle is fixedly provided at the end of the safety pin near the spring pin. This allows for quick insertion and removal of the safety pin while increasing the contact area between the safety pin and the spring pin, thus improving the stability of the spring pin in blocking the safety pin. Even under complex working conditions or unexpected force, the safety pin is unlikely to slide out of the blocking range of the spring pin, effectively limiting the operation of the isolation handle and further enhancing the safety and reliability of the overall device in preventing misoperation. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, the drawings used in the description will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a three-dimensional structural diagram of a high-voltage distribution cabinet anti-misoperation protection device according to one or more embodiments of the present invention.

[0023] Figure 2 This is a side view of the high-voltage distribution cabinet anti-misoperation protection device according to one or more embodiments of the present invention.

[0024] Figure 3 This is a schematic diagram of the structure of an existing isolation handle according to one or more embodiments of the present invention;

[0025] Figure 4 This is a schematic diagram of the electrical principle of the present invention according to one or more embodiments;

[0026] The components represented by the various reference numerals in the diagram are:

[0027] 1. Electromagnetic telescopic unit; 2. Spring pin; 3. Spring; 4. Pin body; 5. Safety pin; 6. Rotating shaft; 7. Existing isolating handle; 8. Existing load isolating switch operating mechanism; 9. First limit hole; 10. Second limit hole; 11. Cabinet; 12. Mounting hole; 13. Baffle; 14. Electromagnet coil; 15. Circuit breaker normally open auxiliary contact. Detailed Implementation

[0028] To make the objectives, features, and advantages of this utility model more apparent and understandable, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings of the specific embodiments. Obviously, the embodiments described below are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this patent, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this patent.

[0029] In a typical embodiment of this utility model, such as Figures 1-4 As shown, a high-voltage distribution cabinet anti-misoperation protection device is proposed, including: an electromagnetic telescopic unit 1, a spring pin 2, and a safety pin 5. The electromagnetic telescopic unit 1 is fixedly installed inside the high-voltage distribution cabinet. The cabinet body 12 of the high-voltage distribution cabinet has a mounting hole 12. The spring pin 2 is laterally slidably disposed in the mounting hole 12. One end of the spring pin 2 is close to the electromagnetic telescopic unit 1, and the other end of the spring pin 2 extends outward from the cabinet body 11. The spring pin 2 can extend outward under the control of the electromagnetic telescopic unit 1, and can be directed towards the inside of the high-voltage distribution cabinet under the action of the spring 5. The mobile self-resetting electromagnetic telescopic unit 1 is connected in series with the normally open auxiliary contact 15 of the circuit breaker in the high-voltage distribution cabinet via a wire. When the circuit breaker is closed, the normally open auxiliary contact 15 of the circuit breaker closes, and the electromagnetic telescopic unit 1 is energized to push the spring pin 2 outward. The safety pin 5 is used to be horizontally inserted between the existing load disconnect switch operating mechanism 8 and the existing disconnect handle 7. The spring pin 2 is perpendicular to the axis of the safety pin 5, so that the spring pin 2 can block the safety pin 5 and prevent the safety pin 5 from being pulled out, thereby preventing load misoperation.

[0030] like Figure 1 and Figure 3 As shown, the existing load disconnect switch operating mechanism 8 is fixedly installed on the cabinet 11. The existing disconnect handle 7 is rotatably connected to the existing load disconnect switch operating mechanism 8 via a rotating shaft. The existing load disconnect switch operating mechanism 8 has a first limiting hole 9 located above the rotating shaft 6 for the insertion of the safety pin 5. The existing disconnect handle 7 has two second limiting holes 10 arranged vertically opposite each other. The two second limiting holes 10 are used independently to cooperate with the first limiting hole 9 after the existing disconnect handle 7 is rotated to the correct position. When the existing disconnect handle 7 is pulled / closed to the correct position, the safety pin 5 can be inserted into the coaxial first limiting hole 9 and second limiting hole 10, thereby restricting the rotation of the existing disconnect handle 7 to cooperate with the use of the spring pin 2 and prevent load misoperation.

[0031] like Figure 1As shown, the mounting hole 12 and the first limiting hole 9 are at the same horizontal level, so that the spring pin 2 and the first limiting hole 9 are at the same horizontal level, and the spring pin 2 is located on one side of the first limiting hole 9. When the safety pin 5 is inserted into the coaxial first limiting hole 9 and second limiting hole 10, the spring pin 2 can be used to block the safety pin 5 to limit the safety pin 5 from being pulled out, thereby playing the role of preventing load misoperation.

[0032] It is understandable that the first limiting hole 9, the second limiting hole 10, and the mounting hole 12 are all directly drilled on the existing high-voltage distribution cabinet 12, the existing isolating handle 7, and the existing load isolating switch operating mechanism 8, which facilitates the renovation of old facilities and reduces the cost of renovation and upgrading.

[0033] In this embodiment, the electromagnetic telescopic unit 1 is a solenoid electromagnet structure, containing an electromagnet coil 14 and an iron core, such as... Figure 4 As shown, the electromagnet coil 14 is connected in series with the normally open auxiliary contact 15 of the circuit breaker in the high-voltage distribution cabinet through a wire. When the circuit breaker is closed, the normally open auxiliary contact 15 of the circuit breaker closes, the electromagnetic expansion unit 1 is energized and operates to push the spring pin 2 outward. When the circuit breaker is opened, the normally open auxiliary contact 15 of the circuit breaker resets, the electromagnetic expansion unit 1 is de-energized and resets, and the spring pin 2 resets itself under the action of elastic force.

[0034] The spring pin 2 includes a spring 3, a pin body 4, and a baffle 13. A baffle 13 is fixed at each end of the pin body 4. The size of the baffle 13 is larger than the size of the mounting hole 12 on the cabinet 11, thereby restricting the pin body 4 from being pulled out of the mounting hole 12. The spring 3 is sleeved on the pin body 4 and is located between the cabinet 11 and the baffle 13 located inside the cabinet 11, which plays a self-resetting role. When the electromagnetic telescopic unit 1 pushes the pin body 4 outward, it compresses the spring 3. When the electromagnetic telescopic unit 1 cancels the pushing force on the pin body 4, the pin body 4 can self-reset under the action of the spring 3.

[0035] The safety pin 5 is a T-shaped pin. Specifically, a baffle 13 is fixedly provided at the end of the safety pin 5 near the spring pin 2. On the one hand, it can realize the quick insertion and removal of the safety pin 5. On the other hand, since the spring pin 2 is at the same height as the first limiting hole 9, the spring pin 2 can be used to block the safety pin 5, so as to limit the safety pin 5 from being pulled out, thus preventing accidental operation. At the same time, when the spring pin 2 returns to its original position, the safety pin 5 can also be used to continue to limit the rotation of the existing isolation handle 7. Only after the safety pin 5 is pulled out can the existing isolation handle 7 be rotated, effectively preventing the safety accident caused by the isolation handle 7 falling off automatically.

[0036] It is understandable that the baffle 13 can be a rectangular plate, a circular plate, a triangular plate, etc. The specific shape can be selected according to actual needs. There are no too many restrictions here, as long as it can play a limiting role.

[0037] The specific working principle is as follows:

[0038] When the closing button is pressed, the circuit breaker closing coil is energized, the circuit breaker closes, and the normally open auxiliary contact 15 of the circuit breaker closes. The electromagnet coil 14 is energized and attracted, the electromagnetic telescopic unit 1 is activated, and the spring pin 2 on the linkage cabinet 11 is pushed out of the distribution cabinet plane to block the safety pin 5 at the existing isolating handle 7. At this time, the safety pin 5 cannot be pulled out, so the existing isolating handle 7 cannot be operated in the closed state, ensuring that the isolating switch cannot be opened or closed under load, and ultimately preventing the misoperation of opening or closing the isolating switch under load.

[0039] During switching operations (power outages), the existing isolating handle 7 is blocked by the spring pin 2 and cannot be operated, thus preventing misoperation. When the trip button is pressed, the circuit breaker trip coil is energized, the circuit breaker trips, and the circuit breaker is simultaneously reset. The electromagnetic telescopic unit 1 is de-energized and retracts, and the spring pin 2 is reset under the action of elasticity, releasing the restriction on the safety pin 5 at the existing isolating handle 7. At this time, the isolating switch can be tripped, ultimately preventing misoperation of opening or closing the isolating switch under load.

[0040] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-voltage switchgear anti-misoperation protection device, comprising: The electromagnetic telescopic unit (1) is characterized in that the electromagnetic telescopic unit (1) is fixedly installed inside the cabinet (11) of the high voltage distribution cabinet, the electromagnetic telescopic unit (1) is connected in series with the normally open auxiliary contact (15) of the circuit breaker inside the cabinet (11), a spring pin (2) is slidably connected on the cabinet (11), and the electromagnetic telescopic unit (1) is used to push the spring pin (2) out of the cabinet (11); a safety pin (5) is inserted between the existing load isolating switch operating mechanism (8) and the existing isolating handle (7) on the cabinet (11), the safety pin (5) is close to the extended spring pin (2), and the extended spring pin (2) is used to limit the safety pin (5) from being pulled out.

2. The high-voltage distribution cabinet anti-misoperation protection device according to claim 1, characterized in that, The cabinet (11) has an installation hole (12), and the spring pin (2) is slidably installed in the installation hole (12). One end of the spring pin (2) is close to the electromagnetic telescopic unit (1), and the other end of the spring pin (2) extends outward from the cabinet (11).

3. The high-voltage distribution cabinet anti-misoperation protection device according to claim 1, characterized in that, The existing load disconnect switch operating mechanism (8) is fixedly installed on the cabinet (11). The existing disconnect handle (7) is rotatably connected to the existing load disconnect switch operating mechanism (8) through the rotating shaft (6). The existing load disconnect switch operating mechanism (8) has a first limiting hole (9). The existing disconnect handle (7) has two second limiting holes (10) arranged vertically opposite to each other. The two second limiting holes (10) are used independently in conjunction with the first limiting hole (9).

4. The high-voltage distribution cabinet anti-misoperation protection device according to claim 3, characterized in that, The safety pin (5) is inserted into the first limiting hole (9) and the second limiting hole (10) on the coaxial axis.

5. The high-voltage distribution cabinet anti-misoperation protection device according to claim 3, characterized in that, The first limiting hole (9) is located above the rotating shaft (6).

6. The high-voltage distribution cabinet anti-misoperation protection device according to claim 3, characterized in that, The spring pin (2) is at the same horizontal level as the first limiting hole (9), and the spring pin (2) is located on one side of the first limiting hole (9).

7. The high-voltage distribution cabinet anti-misoperation protection device according to claim 1, characterized in that, The spring pin (2) includes a pin body (4), with a baffle (13) fixed at both ends of the pin body (4), and a spring (3) sleeved on the pin body (4).

8. The high-voltage distribution cabinet anti-misoperation protection device according to claim 1, characterized in that, A baffle (13) is fixedly provided at one end of the safety pin (5) near the spring pin (2).

9. The high-voltage distribution cabinet anti-misoperation protection device according to claim 1, characterized in that, The electromagnetic telescopic unit (1) is a solenoid electromagnet structure.

10. The high-voltage switchgear anti-misoperation protection device according to claim 1, characterized in that, The spring pin (2) is perpendicular to the axis of the safety pin (5).

Images