A 3.6-40.5kV high-voltage switchgear interlocking device and operation method

Abstract

The present invention relates to the technical field of switch cabinets, specifically to an interlocking device and operating method for a 3.6-40.5kV high-voltage switch cabinet, comprising a movable slide sliding along a front middle door, a first travel switch fixedly connected to the front middle door, and an electric latch, the electric latch being controlled by an electric operating system, the first travel switch being connected in series with the electric operating system; a first limiting hole and a second insertion hole being provided on the movable slide, when the electric latch is inserted into the first limiting hole, the second insertion hole is staggered with the crank insertion hole and the switch node of the first travel switch contacts the movable slide, the switch node of the first travel switch only detaches from the movable slide when the second insertion hole coincides with the crank insertion hole. The present application is not only simple in structure, cost-effective and easy to install, but can also realize manual operation, electric operation and maintenance interlocking, and can prevent the switch cabinet from being opened manually and electrically during maintenance, thereby protecting the staff.

Description

Technical Field

[0001] The invention belongs to the technical field of switch cabinets, and in particular relates to a 3.6-40.5kV high-voltage switch cabinet interlocking device and an operating method. Background Art

[0002] Intelligent operation is a strategic consideration that aligns with the needs of the times and firmly implements the principle of prioritizing people first. Switchgear now requires intelligent electric operation of trolleys. To prevent electric shock and other accidents, manual and electric intelligent operation must be interlocked. Otherwise, the following issues may arise.

[0003] 1) When the trolley is manually moved in, it receives an electric swing-out command at the same time. This will cause the trolley command to conflict, resulting in mechanical jamming and damage to parts.

[0004] 2) When the handcart is being manually cranked, it receives an electric cranking command at the same time. This will cause the operator to misjudge and cause an operational error.

[0005] 3) When the trolley is being manually cranked out, it receives an electric cranking command at the same time. This will cause the trolley command to conflict, resulting in mechanical jamming and component damage. In severe cases, it may cause the equipment to explode.

[0006] 4) When the trolley is manually cranked out, it receives an electric cranking command at the same time. This will cause the trolley command to conflict, causing the trolley to jam and parts to be damaged.

[0007] If the user is unaware of the precautions, the above situations are likely to occur and are very dangerous, posing a significant safety hazard.

[0008] In existing settings, although there are interlocking devices that can achieve manual and electric operation, the existing device interlocking methods are complex in structure and require multiple parts to assemble and cooperate. Due to the large number of parts, it brings the disadvantages of cumbersome assembly and poor reliability. Summary of the Invention

[0009] The present invention provides a 3.6-40.5 kV high-voltage switch cabinet interlocking device and an operating method, which are used to solve the defects in the prior art.

[0010] The present invention is achieved through the following technical solutions:

[0011] A 3.6-40.5kV high-voltage switchgear interlocking device includes a movable slide sliding along the front middle door, a first travel switch fixedly connected to the front middle door, and an electric bolt. The electric bolt is controlled by an electric operating system, and the first travel switch is connected in series with the electric operating system. A first limiting hole and a second insertion hole are provided on the movable slide. When the electric bolt is inserted into the first limiting hole, the second insertion hole is staggered with the crank insertion hole and the switch node of the first travel switch contacts the movable slide. When the second insertion hole coincides with the crank insertion hole, the switch node of the first travel switch disengages from the movable slide.

[0012] During use, the present application is electrically operated under normal conditions. Therefore, the electric bolt rod is inserted into the first limiting hole, and the second insertion hole and the crank insertion hole are staggered, so the crank cannot be inserted into the crank insertion hole, and thus manual operation is impossible. When manual operation is required, the electric operating system is first used to move the electric bolt rod out of the first limiting hole, so that the movable slide can be moved. When the second insertion hole on the movable slide is moved to coincide with the crank insertion hole, the switch node of the first travel switch is separated from the movable slide, so that the second travel switch is disconnected, and then the electric operating system circuit is disconnected, and electric operation cannot be performed, so manual operation can be performed safely. Therefore, the present application can not only realize manual and electric interlocking, but also can be realized by a movable slide, a travel switch and an electric bolt. The structure is simple, not only saves costs, but also is simple to assemble and has good reliability.

[0013] Preferably, a mechanical lock is also fixedly connected to the front middle door, and the mechanical lock is equipped with a key that is compatible with the rear door lock of the switch cabinet. A second limiting hole is provided on the dynamic slide plate into which the mechanical lock pin shaft can be inserted. The mechanical lock key can only be pulled out when the mechanical lock pin shaft is inserted into the second limiting hole. When the mechanical lock pin shaft is inserted into the second limiting hole, the electric latch is staggered with the first limiting hole, the second insertion hole and the crank insertion hole. When maintenance is needed, move the movable slide plate so that the pin shaft of the mechanical lock is opposite to the second limit hole up and down, and then rotate the mechanical lock key so that the pin shaft of the mechanical lock is inserted into the second limit hole. At this time, the key can be pulled out, and the rear door can be opened to achieve maintenance. At the same time, when the pin shaft of the mechanical lock is inserted into the second limit hole, the electric bolt is staggered with the first limit hole, the second insertion hole and the crank insertion hole, and the switch node of the first travel switch is disengaged from the movable slide plate, so that manual operation and electric operation cannot be used at this moment, thereby meeting the requirement that manual operation and electric operation cannot be used during maintenance, realizing interlocking of manual operation, electric operation and maintenance status, and ensuring the safety of maintenance personnel.

[0014] Preferably, a second travel switch connected to a backstage system signal is fixedly connected to the front middle door. The switch contact of the second travel switch is opposite to the other end of the mechanical lock pin shaft. When the mechanical lock pin shaft is pulled out of the second limit hole, the other end of the mechanical lock pin shaft contacts the switch contact of the second travel switch. When the other end of the mechanical lock pin shaft contacts the switch contact of the second travel switch, the second travel switch sends a signal to the backstage system, thereby notifying backstage staff which high-voltage cabinet is under maintenance.

[0015] Preferably, the upper portion of the movable slide is bent outward at 90 degrees to form an upper plate, and the first limiting hole and the second limiting hole are provided in the corresponding upper plate. This enables the first limiting hole, the second limiting hole and the second insertion hole to be distributed at different angles, thereby facilitating the installation of the corresponding electric bolt and mechanical lock on the front middle door.

[0016] Preferably, a fixed slide is fixedly connected to the front middle door, and a movable slide is a U-shaped structure. The movable slide is located between the fixed slide and the front middle door, and is clamped on and slides along the fixed slide. The fixed slide is provided with a first insertion hole that coincides with the crank insertion hole. The movable slide is a U-shaped structure and is clamped on the fixed slide, thereby facilitating the use of the movable slide while meeting the requirements of use.

[0017] A gasket is provided between the fixed slide and the front middle door. The fixed slide is fixedly connected to one side of the gasket, and the other side of the gasket is fixedly connected to the front middle door. The gasket is provided on the side of the movable slide that is away from the direction of movement. The gasket acts as a spacer, ensuring that the fixed slide is fixedly connected to the front middle door while the movable slide can slide along the fixed slide in the gap between the front middle door and the fixed slide.

[0018] Preferably, a blocking mechanism having an up-and-down movable shaft is fixedly connected to the front middle door. When the first insertion hole and the second insertion hole are aligned, the outer end of the sliding plate is blocked by the blocking mechanism via the extended shaft. The downward movement of the blocking mechanism's shaft blocks the sliding plate, thereby preventing further movement of the sliding plate, thereby ensuring smooth manual operation. The shaft can be retracted to ensure continued movement of the sliding plate when needed.

[0019] , including the following steps:

[0020] (1) In the electric operation state, the electric bolt is controlled by the electric operating system command, and the plug rod of the electric bolt is inserted downward into the first limit hole of the dynamic slide. The dynamic slide cannot move, and the crank handle insertion hole is completely blocked by the dynamic slide, and the crank handle cannot be inserted. The manual operation is reliably locked; the mechanical lock shaft pin cannot move downward due to the obstruction of the dynamic slide, the key cannot be pulled out, and the switch cabinet cannot enter the maintenance and open the back door state;

[0021] (2) In the manual operation state, after the electric operating system controls the electric latch shaft to move out of the first limit hole, the slide plate can be pushed and pulled by hand. When the first insertion hole and the second insertion hole coincide, the blocking mechanism shaft moves downward to block the moving slide plate from continuing to move. The switch contacts of the first stroke switch are disengaged from the moving slide plate, thereby cutting off the power to the first stroke switch and the electric operating system connected in series with the first stroke switch. The crank is inserted into the crank insertion hole for manual operation, but the mechanical lock shaft pin is still blocked by the moving slide plate and cannot move downward. The key cannot be pulled out and the rear door cannot be opened for maintenance.

[0022] (3) Maintenance state: When the trolley is in the electric operation state, the electric operating system controls the plug rod of the electric latch to move out of the first limit hole, releases the limit with the movable slide and moves the movable slide to the relative position of the mechanical lock shaft pin and the second limit hole. At this time, the switch node of the first travel switch is separated from the movable slide, and the electric operating mechanism is in the power-off state. Then, the key of the mechanical lock is rotated, and the mechanical lock shaft pin is inserted into the second limit hole, so that the key of the mechanical lock can be pulled out from the mechanical lock and the rear door is opened to enter the maintenance state; when the trolley is in the manual operation state, the blocking mechanism is controlled so that the blocking mechanism shaft moves upward and no longer blocks the movable slide and moves the movable slide so that the mechanical lock shaft pin is relative to the second limit hole and the mechanical lock is rotated. The key is removed to open the rear door for maintenance.

[0023] The beneficial effects of the present invention are: this application is not only simple in structure, cost-saving and easy to install, but also can realize manual operation, electric operation and maintenance interlocking. During maintenance, it can prevent the switch cabinet from being opened manually and electrically, thereby protecting the staff. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings required for operation in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 It is a structural schematic diagram of the movable slide of the present invention;

[0026] Figure 2 It is a schematic diagram of electric operation;

[0027] Figure 3 It is a manual operation diagram;

[0028] Figure 4 This is a schematic diagram of the maintenance status.

[0029] As shown in the figure:

[0030] 1. Front middle door, 2. Dynamic slide, 3. Electric latch, 4. First limit hole, 5. Second limit hole, 6. First travel switch, 7. Mechanical lock, 8. Second insertion hole, 9. Fixed slide, 10. Second travel switch, 11. Blocking mechanism, 12. First insertion hole. DETAILED DESCRIPTION

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0032] A 3.6-40.5kV high voltage switchgear interlocking device and operation method, such as Figure 1-4 The structure comprises a fixed slide 9 and a movable slide 2. The fixed slide 9 is laterally fixedly connected to the front middle door 1 via a gasket. The movable slide 2 is a U-shaped structure with the U-shaped opening facing forward and is clamped on the fixed slide 9. The gasket is located on the outside of the movable slide 2. Support plates are vertically connected to the upper and lower parts of the front of the fixed slide 9 to support and limit the bending part of the movable slide 2.

[0033] The front middle door 1 is also fixedly connected to a first travel switch 6 and an electric bolt 3. The electric bolt 3 is an electromagnetic bolt and is controlled by the electric operating system. The first travel switch 6 is connected in series with the electric operating system. The electric bolt 3 is located on the right side of the first travel switch 6 and on the left side of the support plate. The plug rod of the electric bolt 3 and the switch node of the first travel switch 6 are both facing downward. The movable slide 2 is provided with a first limit hole 4 that is transparent from top to bottom. The downward extension line of the plug rod of the electric bolt 3 intersects with the trajectory line of the first limit hole 4. The movable slide 2 is provided with a second insertion hole 8, and the fixed slide 9 is provided with a first insertion hole 12. The first insertion hole 12 coincides with the crank insertion hole. When the first insertion hole 12 coincides with the second insertion hole 8, the plug rod of the electric bolt 3 cannot be inserted into the first limit hole 4, and at this moment the switch node of the first travel switch 6 is disengaged from the movable slide 2. When the plug rod of the electric bolt 3 is inserted into the first limit hole 4, the first insertion hole 12 and the second insertion hole 8 are staggered.

[0034] A mechanical lock 7 is also fixedly connected to the front middle door 1. It is located to the right of the electric bolt 3, and its pin moves up and down. A key is provided on the mechanical lock 7, which matches the lock plate on the switch cabinet rear door. The movable slide 2 also has a second stopper hole 5, into which the pin of the mechanical lock 7 can be inserted downward. Only after insertion can the key be removed from the rear door. At this point, the first insertion hole 12 and the second insertion hole 8 are also offset.

[0035] A blocking mechanism 11 is also fixedly connected to the front middle door 1. The blocking mechanism 11 is an electromagnetic latch. The blocking mechanism 11 is located on the right side of the mechanical lock 7. When the first insertion hole 12 and the second insertion hole 8 coincide, the shaft of the blocking mechanism 11 moves downward and can contact the right end surface of the movable slide 2. After the blocking mechanism 11 returns to its initial position, it will not block the movable slide 2.

[0036] The first travel switch 6 and the second travel switch 10 are both LXW20-11, wherein 11 represents a normally open contact and a normally closed contact.

[0037] When using this application:

[0038] (1) In the electric operation state, the electric bolt 3 is controlled by the electric operating system instruction, and the rod of the electric bolt 3 is inserted downward into the first limit hole 4 of the movable slide 2. The movable slide 2 cannot move, and the crank handle insertion hole is completely blocked by the movable slide 2, so the crank handle cannot be inserted. The manual operation is reliably locked; the mechanical lock 7 axis pin is blocked by the movable slide 2 and cannot move downward, the key cannot be pulled out, and the switch cabinet cannot enter the maintenance and open the back door state;

[0039] (2) In the manual operation state, after the electric operating system controls the shaft of the electric bolt 3 to move out of the first limit hole 4, the slide plate 2 can be pushed and pulled by hand. When the first insertion hole 12 and the second insertion hole 8 coincide, the shaft of the blocking mechanism 11 moves downward to block the moving slide plate 2 from continuing to move. The switch contacts of the first travel switch 6 are in a disengaged state from the moving slide plate 2, thereby cutting off the power to the first travel switch 6 and the electric operating system connected in series with the first travel switch 6. The crank is inserted into the crank insertion hole for manual operation, while the shaft pin of the mechanical lock 7 is still blocked by the moving slide plate 2 and cannot move downward. The key cannot be pulled out and the rear door cannot be opened for maintenance.

[0040] (3) Maintenance state: When the trolley is in the electric operation state, the electric operating system controls the plug rod of the electric latch 3 to move out of the first limit hole 4, releases the limit with the movable slide 2 and moves the movable slide 2 to the position where the mechanical lock 7 shaft pin and the second limit hole 5 are relative to each other. At this time, the switch node of the first travel switch 6 is separated from the movable slide 2, and the electric operating mechanism is in the power-off state. Then, the key of the mechanical lock 7 is rotated, and the mechanical lock 7 shaft pin is inserted into the second limit hole 5, so that the key of the mechanical lock 7 can be pulled out from the mechanical lock 7 and the rear door is opened to enter the maintenance state; when the trolley is in the manual operation state, the blocking mechanism 11 is controlled so that the blocking mechanism 11 shaft rod moves upward and no longer blocks the movable slide 2 and moves the movable slide 2 so that the mechanical lock 7 shaft pin is relative to the second limit hole 5 and the mechanical lock 7 is rotated. The key is removed to open the rear door for maintenance.

[0041] A second travel switch 10, connected to the backstage system signal, is fixedly connected to the front middle door 1. The switch contact of the second travel switch 10 is opposite the other end of the pin of the mechanical lock 7. When the pin of the mechanical lock 7 is pulled out of the second limit hole 5, the other end of the pin of the mechanical lock 7 contacts the switch contact of the second travel switch 10. When the other end of the pin of the mechanical lock 7 contacts the switch contact of the second travel switch 10, the second travel switch 10 sends a signal to the backstage system, thereby notifying the backstage staff which high-voltage cabinet is under maintenance.

[0042] The present application is not only simple in structure, cost-effective and easy to install, but also can realize manual operation, electric operation and maintenance interlocking, which can prevent the switch cabinet from being opened manually and electrically during maintenance, thereby protecting the staff.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A 3.6-40.5kV high-voltage switchgear interlocking device, characterized by: The lock assembly comprises a first limit switch and a second limit switch, wherein the first limit switch is connected to the first limit switch and the second limit switch is connected to the first limit switch. The switch, the switch contact of the second travel switch is opposite to the other end of the mechanical lock pin shaft and when the mechanical lock pin shaft is pulled out of the second limit hole, the other end of the mechanical lock pin shaft contacts the switch contact of the second travel switch; the upper part of the movable slide is bent outward at 90 degrees to provide an upper plate, and the first limit hole and the second limit hole are arranged in the corresponding upper plate; the front middle door is also fixedly connected to a fixed slide, the movable slide is a U-shaped structure, the movable slide is located between the fixed slide and the front middle door, and the movable slide is stuck on the fixed slide and slides along the fixed slide, and a first insertion hole is provided on the fixed slide that coincides with the crank insertion hole; a gasket is provided between the fixed slide and the front middle door, the fixed slide is fixedly connected to one side of the gasket, and the other side of the gasket is fixedly connected to the front middle door, and the gasket is arranged on the side of the movable slide away from the moving direction; the front middle door is also fixedly connected to a blocking mechanism of the shaft rod that can move up and down, and when the first insertion hole and the second insertion hole are opposite to each other, the outer end of the sliding plate is blocked by the blocking mechanism extended by the shaft rod.

2. The operating method of the 3.6-40.5kV high-voltage switchgear interlocking device according to claim 1, characterized in that: The following steps are involved: (1) In the electric operation state, the electric bolt is controlled by the electric operating system command, and the plug rod of the electric bolt is inserted downward into the first limit hole of the dynamic slide. The dynamic slide cannot move, and the crank handle insertion hole is completely blocked by the dynamic slide, and the crank handle cannot be inserted. The manual operation is reliably locked; the mechanical lock shaft pin cannot move downward due to the obstruction of the dynamic slide, the key cannot be pulled out, and the switch cabinet cannot enter the maintenance and open the back door state; (2) In the manual operation state, after the electric operating system controls the electric latch shaft to move out of the first limit hole, the slide plate can be pushed and pulled by hand. When the first insertion hole and the second insertion hole coincide, the blocking mechanism shaft moves downward to block the moving slide plate from continuing to move. The switch contacts of the first stroke switch are disengaged from the moving slide plate, thereby cutting off the power to the first stroke switch and the electric operating system connected in series with the first stroke switch. The crank is inserted into the crank insertion hole for manual operation, but the mechanical lock shaft pin is still blocked by the moving slide plate and cannot move downward. The key cannot be pulled out and the rear door cannot be opened for maintenance. (3) Maintenance state: When the trolley is in the electric operation state, the electric operating system controls the plug rod of the electric latch to move out of the first limit hole, releases the limit with the movable slide and moves the movable slide to the relative position of the mechanical lock shaft pin and the second limit hole. At this time, the switch node of the first travel switch is separated from the movable slide, and the electric operating mechanism is in the power-off state. Then, the key of the mechanical lock is rotated, and the mechanical lock shaft pin is inserted into the second limit hole, so that the key of the mechanical lock can be pulled out from the mechanical lock and the rear door is opened to enter the maintenance state; when the trolley is in the manual operation state, the blocking mechanism is controlled so that the blocking mechanism shaft moves upward and no longer blocks the movable slide and moves the movable slide so that the mechanical lock shaft pin is relative to the second limit hole and the mechanical lock is rotated. The key is removed to open the rear door for maintenance.

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