110 kV GIS device knife switch, ground knife switch mechanical locking device

Abstract

110kVGIS device knife switch, grounding knife switch mechanical locking device relates to the technical field of power equipment safety protection, including the knife switch main body, the inside of the knife switch main body is equipped with magnetic blowout switch, and the operating panel of magnetic blowout switch is located below the front end face of the knife switch main body, the operating panel of magnetic blowout switch is equipped with valve, and the valve is rotated by tool to carry out magnetic blowout switch opening and closing operation, the middle position of the operating panel of magnetic blowout switch is equipped with square hole, the front of the operating panel of magnetic blowout switch is equipped with cover, the front end of the cover is equipped with movable locking plate, the front end of the locking plate is equipped with pin, and the pin extends to the inside of square hole through cover, after the application in valve is lifted and power off, the valve reset is blocked, the scheme solves the risk of misoperation caused by the lack of mechanical locking of GIS device knife switch, grounding knife switch, and the problems of high cost, complex structure and installation affecting equipment operation of existing locking scheme.

Description

Technical Field

[0001] This utility model relates to the field of power equipment safety protection technology, specifically to a mechanical interlocking device for 110kV GIS equipment disconnect switches and grounding disconnect switches. Background Technology

[0002] In power system operation, 110kV GIS equipment is a critical power device, and the operational safety of its bus-side disconnectors and grounding disconnectors directly affects grid stability and personnel safety. Currently, some substations within the jurisdiction lack mechanical interlocking structures for the bus-side disconnectors and grounding disconnectors of their 110kV GIS equipment. Due to this lack of mechanical interlocking, during maintenance work, there is a risk of maintenance personnel accidentally touching the disconnector power supply when testing the insulation resistance of the secondary circuit. This could lead to serious electrical malfunctions such as closing the disconnector with the grounding switch on or the grounding switch suddenly closing while the disconnector is in operation, severely threatening equipment integrity and personnel safety.

[0003] In existing technologies, some interlocking schemes suffer from high cost, complex structure, difficult installation, or inability to simultaneously achieve both mechanical and electrical interlocking. These limitations make it difficult to effectively prevent operational risks while ensuring the original structure of the equipment remains intact. Therefore, there is an urgent need for a low-cost, simple, and highly reliable device capable of dual interlocking to overcome the shortcomings of existing technologies and improve the operational safety of 110kV GIS equipment. To address this, we propose a mechanical interlocking device for the disconnect switches and grounding switches of 110kV GIS equipment. Utility Model Content

[0004] The purpose of this utility model is to provide a mechanical interlocking device for 110kV GIS equipment disconnectors and grounding disconnectors, so as to solve the risk of misoperation caused by the lack of mechanical interlocking of GIS equipment disconnectors and grounding disconnectors mentioned in the background art, as well as the problems of high cost, complex structure and installation affecting equipment operation of existing interlocking schemes.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mechanical interlocking device for 110kV GIS equipment disconnect switches and grounding disconnect switches, comprising a disconnect switch body, wherein a magnetic blow-out switch is provided inside the disconnect switch body, and the operation panel of the magnetic blow-out switch is located below the front end of the disconnect switch body. The operation panel of the magnetic blow-out switch is provided with a valve, and the magnetic blow-out switch is opened and closed by rotating the valve with a tool. A square hole is provided in the middle of the operation panel of the magnetic blow-out switch, and a cover is provided in front of the operation panel of the magnetic blow-out switch. A movable locking plate is provided at the front end of the cover, and a pin is provided at the front end of the locking plate, and the pin extends through the cover into the interior of the square hole, which is used to prevent the valve from resetting after the valve is lifted and de-energized.

[0006] Preferably, the pin includes a smooth rod, one end of which is provided with a limiting rod. The limiting rod has a square cross-section and is inserted into a square hole. The other end of the smooth rod is provided with a thread. After the limiting rod is inserted into the square hole, the threaded part is located in front of the locking plate, and the threaded part of the pin is fixed to the locking plate by a nut.

[0007] Preferably, a washer is provided between the nut and the locking plate.

[0008] Preferably, the front end of the cover is provided with locking pins at both the top and bottom, and a locking plate is provided between the two locking pins. The upper end of the locking plate is connected to the upper locking pin through a pivot, and the lower end of the locking plate is engaged with the lower locking pin. After being engaged, the locking plate locks and limits one end of the locking plate. The lower locking pin and the locking plate are locked and fixed by a padlock.

[0009] Preferably, the cover and the magnetic blow-out switch are fixedly connected by screws.

[0010] Preferably, a circular hole is provided on one side of the locking plate for the smooth rod and threaded portion of the pin to pass through.

[0011] Compared with the prior art, the beneficial effects of this utility model are:

[0012] 1. This utility model constructs a dual mechanical and electrical interlocking defense line through the linkage design of the locking pin with the original valve and magnetic blow-out switch of the equipment. When the device is activated, the locking pin not only directly blocks the valve from returning to its original position and prevents the manual operating lever from being inserted into the operating port, thus cutting off the manual operation path from a mechanical perspective; it also works in conjunction with the open state of the magnetic blow-out switch to ensure that the equipment mechanism is de-energized and completely disables the electric operation function. This dual protection mechanism can fundamentally avoid major electrical misoperation accidents such as closing the disconnect switch with the grounding switch on or accidentally closing the grounding switch while the disconnect switch is running, providing comprehensive protection for the personal safety of maintenance personnel and the safe operation of equipment.

[0013] 2. This utility model features a simple overall structure, with core components consisting only of a locking pin and a perforated locking plate. It eliminates the need for complex supporting components, effectively controlling manufacturing and application costs. During installation, no modifications to the mechanical structure of the existing disconnectors and grounding switches are required. Assembly can be completed simply through positioning, tightening, and anti-loosening treatment, ensuring uninterrupted operation of the equipment and lowering the technical barrier to installation. Furthermore, the device is precisely compatible with the existing operating mechanisms of 110kV GIS equipment, requiring no additional adjustments to the original functions, greatly enhancing convenience and adaptability in practical applications. Attached Figure Description

[0014] Figure 1 This is a perspective view of the entire structure after the lid of this utility model is opened;

[0015] Figure 2This is a three-dimensional view of the present invention in its locked state;

[0016] Figure 3 This is a perspective view of the pin of this utility model;

[0017] Figure 4 This is a perspective view of the locking plate of this utility model.

[0018] In the diagram: 1. Knife switch body; 2. Magnetic blow-out switch; 3. Valve; 4. Square hole; 5. Cover; 6. Screw; 7. Pin; 8. Nut; 9. Locking plate; 10. Locking pin head; 11. Locking pin plate; 12. Padlock; 13. Smooth rod; 14. Thread; 15. Limiting rod; 16. Round hole. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0020] Please see Figure 1-4 This utility model provides an embodiment of a mechanical interlocking device for a 110kV GIS equipment disconnect switch and grounding disconnect switch, including a disconnect switch body 1. A magnetic blow-out switch 2 is provided inside the disconnect switch body 1, and the operation panel of the magnetic blow-out switch 2 is located below the front end of the disconnect switch body 1. A valve 3 is provided on the operation panel of the magnetic blow-out switch 2. The magnetic blow-out switch 2 is opened and closed by rotating the valve 3 with a tool. A square hole 4 is provided in the middle of the operation panel of the magnetic blow-out switch 2. A cover 5 is provided in front of the operation panel of the magnetic blow-out switch 2. A movable locking plate 9 is provided at the front end of the cover 5. A pin 7 is provided at the front end of the locking plate 9, and the pin 7 extends through the cover 5 into the interior of the square hole 4. It is used to prevent the valve 3 from resetting after the valve 3 is lifted and de-energized.

[0021] When the equipment needs to be locked, first lift the valve 3 with a tool. The valve 3 separates from the magnetic blow-out switch 2, causing the magnetic blow-out switch 2 to disconnect. This de-energizes the equipment mechanism, disabling the electric operation function. Then, push the pin 7 through the cover 5 and insert it into the square hole 4. At this point, the pin 7 physically prevents the valve 3 from falling back to its initial position. Even if you try to push the valve 3, it will be limited by the pin 7. At the same time, because the magnetic blow-out switch 2 remains in the off state, the electric operation cannot be resumed, and manual operation is also impossible because the valve 3 cannot return to its original position. This structure, through the linkage between the valve and the magnetic blow-out switch and the physical limitation of the pin, forms a dual protection of "power outage plus mechanical obstruction." It can quickly cut off the electric operation path and lock the valve position, preventing misoperation caused by the valve's accidental reset from the source.

[0022] Please see Figure 3The pin 7 includes a smooth rod 13, one end of which is provided with a limiting rod 15. The limiting rod 15 has a square cross-section and is inserted into the square hole 4. The other end of the smooth rod 13 is provided with a thread 14. After the limiting rod 15 is inserted into the square hole 4, the thread 14 part is located in front of the locking plate 9, and the thread 14 part of the pin 7 is fixed to the locking plate 9 by a nut 8. When installing the pin, the square limiting rod 15 is aligned with the square hole 4 and inserted. The shape of the square structure and the square hole 4 are adapted to prevent the pin 7 from rotating or shifting in the square hole 4. After being inserted into place, the smooth rod 13 supports the pin 7 to keep it stable. Then, the nut 8 is screwed into the thread 14 part in front of the locking plate 9 so that the nut 8 and the locking plate 9 fit tightly together, and the pin 7 is completely fixed in the current position to prevent the pin 7 from loosening or falling out due to equipment vibration. The matching design of the square limit rod and square hole eliminates the risk of pin rotation. The threaded and nut fixing method further enhances the installation stability of the pin. The double fixing structure ensures long-term reliability of the locked state and will not fail due to external force or vibration. At the same time, disassembly and assembly only require turning the nut, making maintenance convenient and without damaging the original structure of the equipment.

[0023] Please see Figure 2 A washer is provided between the nut 8 and the locking plate 9. The addition of the washer not only solves the gap problem between the nut and the locking plate, but also plays a role in buffering pressure, preventing loosening and slipping, effectively extending the service life of the locking plate and the nut, avoiding locking failure caused by component deformation or nut loosening, and further improving the long-term operational stability of the device.

[0024] Please see Figure 2 The cover 5 has locking pins 10 on both the top and bottom of one side of its front end. A locking plate 11 is located between the two locking pins 10. The upper end of the locking plate 11 is connected to the upper locking pin 10 via a pivot, and the lower end of the locking plate 11 engages with the lower locking pin 10. The engaged locking plate 11 locks and limits one end of the locking plate 9. The lower locking pin 10 and the locking plate 11 are locked and fixed by a padlock 12. After the pin 7 is installed and locked, rotation... The locking pin plate 11 rotates downward around the pivot of the upper locking pin head 10 until the lower end of the locking pin plate 11 engages with the lower locking pin head 10. At this point, the locking pin plate 11 will fit against one end of the locking plate 9, restricting the movement of the locking plate 9. Then, the padlock 12 is passed through the lower locking pin head 10 and locked in the corresponding hole of the locking pin plate 11, so that the locking pin plate 11 cannot rotate in the opposite direction to disengage, thereby fixing the position of the locking plate 9 and preventing others from accidentally moving the locking plate 9, causing the pin 7 to shift or fall out.

[0025] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. 110kV GIS equipment disconnect switch and grounding disconnect switch mechanical interlocking device, including disconnect switch body (1), wherein the disconnect switch body (1) is provided with a magnetic blow-out switch (2) inside, and the operation panel of the magnetic blow-out switch (2) is located below the front end face of the disconnect switch body (1). The operation panel of the magnetic blow-out switch (2) is provided with a valve (3). The magnetic blow-out switch (2) is opened and closed by rotating the valve (3) with a tool. The device is characterized in that: The magnetic blow switch (2) has a square hole (4) in the middle of its operation panel. The magnetic blow switch (2) has a cover (5) in front of its operation panel. The front end of the cover (5) has a movable locking plate (9). The front end of the locking plate (9) has a pin (7) that passes through the cover (5) and extends into the square hole (4). The pin (7) is used to prevent the valve (3) from resetting after the valve (3) is lifted and de-energized.

2. The mechanical interlocking device for 110kV GIS equipment disconnect switches and grounding disconnect switches according to claim 1, characterized in that: The pin (7) includes a smooth rod (13), one end of which is provided with a limiting rod (15). The cross-section of the limiting rod (15) is square and is inserted into the square hole (4). The other end of the smooth rod (13) is provided with a thread (14). After the limiting rod (15) is inserted into the square hole (4), the thread (14) part is located in front of the locking plate (9), and the thread (14) part of the pin (7) is fixed to the locking plate (9) by a nut (8).

3. The mechanical interlocking device for 110kV GIS equipment disconnect switches and grounding disconnect switches according to claim 2, characterized in that: A gasket is provided between the nut (8) and the locking plate (9).

4. The mechanical interlocking device for 110kV GIS equipment disconnect switches and grounding disconnect switches according to claim 1, characterized in that: The cover (5) has locking pins (10) on both the top and bottom of one side of the front end. A locking plate (11) is provided between the two locking pins (10). The upper end of the locking plate (11) is connected to the upper locking pin (10) through a pivot. The lower end of the locking plate (11) is engaged with the lower locking pin (10). The engaged locking plate (11) locks and limits one end of the locking plate (9). The lower locking pin (10) and the locking plate (11) are locked and fixed by a padlock (12).

5. The mechanical interlocking device for 110kV GIS equipment disconnect switches and grounding disconnect switches according to claim 1, characterized in that: The cover (5) and the magnetic blow switch (2) are fixedly connected by screws (6).

6. The mechanical interlocking device for 110kV GIS equipment disconnect switches and grounding disconnect switches according to claim 2, characterized in that: The locking plate (9) has a round hole (16) on one side inside, through which the smooth rod (13) and threaded part (14) of the pin (7) pass.

Images