A protection device for a medium voltage switchgear

Abstract

The utility model relates to the field of switch cabinet especially relates to a protection device of medium voltage switch cabinet. The protection device of medium voltage switch cabinet includes the box, is provided with the isolating switch in the box, and the isolating switch one side is connected with the inside wall of box, wherein, is provided with the closing assembly in the box, and through closing assembly can make the isolating switch open and shut, realizes the isolation and the conduction of circuit, the top of box is provided with buffer assembly. The protection device of medium voltage switch cabinet provided by the utility model sets up the closing assembly and converts the rotary motion into the linear motion of the toothed plate through the screw thread drive, and then drives the gear rotation, finally realizes the stirring control to the isolating switch operating lever by the adjusting plate and the stirring plate, and this mechanical transmission mode has higher transmission accuracy and stability, can ensure that the isolating switch still can reliably realize the isolation and the conduction of circuit under the frequent operation, improves the operation safety and reliability of medium voltage switch cabinet.

Description

Technical Field

[0001] This utility model relates to the field of switchgear, and in particular to a protection device for medium-voltage switchgear. Background Technology

[0002] Medium-voltage switchgear, as an important piece of equipment in power systems, is widely used in power plants, substations, industrial enterprises, and other places, undertaking the critical tasks of opening, closing, controlling, and protecting electrical equipment. It contains numerous components, including circuit breakers, disconnect switches, load switches, operating mechanisms, instrument transformers, and various protection devices.

[0003] A utility model patent with Chinese patent authorization announcement number "CN207910284U" discloses an arc flash protection device for switchgear, relating to the field of power technology. This arc flash protection device includes a housing. A first support block is fixedly connected to the top of the housing. A buffer pad is fixedly connected to the inner wall of the first support block. A suction cup is fixedly connected to the inner wall of the buffer pad. An electric push rod is fixedly connected to the top left side of the inner wall of the housing. A first pushing block is fixedly connected to the bottom of the electric push rod. A guide groove is formed on the right side of the first pushing block. A spring is fixedly connected to the left side of the inner wall of the guide groove. A second pushing block is fixedly connected to the right side of the spring. After repair, the switchgear arc flash protection device allows for remote control of the controller. The controller retracts the electric push rod, causing the second pushing block to push the button of the isolating switch upwards. This effectively solves the problem of current arc flash protection devices for switchgear on the market, which cannot remotely control the closing of the main switch inside the switchgear, posing a safety hazard.

[0004] Regarding the aforementioned technologies, the inventors believe that in the above-mentioned utility model, the process of the spring pushing the second push block relies on its own elastic deformation restoring force, which has a certain lag. When it is necessary to quickly control the action of the disconnecting switch to deal with sudden circuit conditions, the spring structure cannot quickly transmit power to the operating lever. Compared with some direct drive or electric drive methods, its response speed cannot meet the requirements of rapid protection, which may delay the timing of circuit protection and increase the risk of electrical faults.

[0005] Therefore, it is necessary to provide a new protection device for medium-voltage switchgear to solve the above-mentioned technical problems. Utility Model Content

[0006] To overcome the shortcomings of existing technologies, a protection device for medium-voltage switchgear is provided to solve the above-mentioned problems.

[0007] The protective device for the medium-voltage switchgear provided by this utility model includes: a cabinet; a disconnecting switch is installed inside the cabinet, and one side of the disconnecting switch is connected to the inner wall of the cabinet; a closing component is installed inside the cabinet, and the closing component enables the disconnecting switch to be opened and closed to achieve circuit isolation and conduction; a buffer component is installed on the top of the cabinet, and the buffer component can effectively reduce the transmission of vibration to the inside of the cabinet and reduce the impact of vibration on the internal electrical components.

[0008] Preferably, the closing assembly includes a threaded rod installed on the inner side wall of the housing, and the threaded rod is arranged opposite to the disconnecting switch. The outer side of the threaded rod is threadedly connected to a toothed plate, and a gear is meshed with the side of the toothed plate near the disconnecting switch. Both ends of the gear are connected to support frames, and the sides of the two support frames near the toothed plate are connected to the inner side wall of the housing. An electric motor for driving the threaded rod to rotate is installed at the inner top of the housing.

[0009] Preferably, an adjusting plate is connected to the side of the gear away from the gear plate, and both ends of the adjusting plate away from the gear are connected to a toggle plate, with the two toggle plates located above and below the disconnecting switch operating lever, respectively.

[0010] Preferably, there is a gap between both of the toggle plates and the operating lever.

[0011] Preferably, the buffer assembly includes a buffer plate located above the housing. Slide rods are installed around the top of the housing. The top of each slide rod passes through the buffer plate and is connected to a limit block. Two buffer springs are sleeved on the outer side of each slide rod, and the buffer springs are located above and below the buffer plate, respectively.

[0012] Preferably, a suction cup electromagnet is installed on the top of the buffer plate, and a power supply is installed on the top of the buffer plate on one side of the suction cup electromagnet, and the suction cup electromagnet is electrically connected to the power supply.

[0013] Compared with related technologies, the protection device for medium-voltage switchgear provided by this utility model has the following beneficial effects:

[0014] The closing component of this invention adopts a transmission structure of threaded rod, toothed plate, and gear. The motor drives the threaded rod to rotate, and the rotational motion is converted into the linear motion of the toothed plate through threaded transmission, which in turn drives the gear to rotate. Finally, the adjusting plate and the toggle plate realize the toggle control of the disconnecting switch operating lever. This mechanical transmission method has higher transmission accuracy and stability, and can ensure that the disconnecting switch can still reliably achieve circuit isolation and conduction under frequent operation, thereby improving the operational safety and reliability of medium-voltage switchgear.

[0015] The buffer assembly of this invention forms a multi-layered shock absorption structure through the coordinated action of a sliding rod, buffer springs, and a buffer plate. When the switchgear is subjected to vibration, the cabinet can slide up and down relative to the buffer plate along the sliding rod. The buffer springs on both sides absorb vibration energy through compression and extension, effectively weakening the transmission of vibration to the inside of the cabinet. This design can adapt to vibration environments of different intensities and frequencies, reducing the impact of vibration on internal electrical components, avoiding problems such as component loosening and poor contact caused by vibration, ensuring the normal operation of electrical components, and extending the service life of the equipment.

[0016] This invention utilizes a suction cup electromagnet mounted on the top of the buffer plate. When energized, the electromagnet generates a strong magnet, firmly attaching the protective device to the inside of the switch cabinet. Compared to traditional fixing methods, installation is more convenient, eliminating the need for destructive operations such as drilling into the switch cabinet. It also facilitates later maintenance and disassembly. Furthermore, the suction force of the electromagnet can be flexibly adjusted by controlling the power supply, ensuring a stable installation under different operating conditions, further enhancing the device's practicality and applicability. Attached Figure Description

[0017] Figure 1 A schematic diagram of a preferred embodiment of the protection device for a medium-voltage switchgear provided by this utility model;

[0018] Figure 2 for Figure 1 The diagram shows the structure of the closed component.

[0019] Figure 3 for Figure 1 The diagram shows the structure of the buffer component.

[0020] The following are the labels in the diagram: 1. Housing; 11. Disconnecting switch; 2. Threaded rod; 21. Toothed plate; 22. Gear; 23. Support frame; 24. Adjusting plate; 25. Actuating plate; 3. Buffer plate; 31. Slide rod; 32. Limiting block; 33. Buffer spring; 4. Suction cup electromagnet; 41. Power supply. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0022] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0023] This utility model provides a protection device for a medium-voltage switchgear. The protection device includes: a housing 1; a disconnecting switch 11 is installed inside the housing 1, and one side of the disconnecting switch 11 is connected to the inner wall of the housing 1; a closing component is installed inside the housing 1, which enables the disconnecting switch 11 to be opened and closed, thereby achieving circuit isolation and conduction; a buffer component is installed on the top of the housing 1, which effectively reduces the transmission of vibration to the interior of the housing 1 and reduces the impact of vibration on the internal electrical components.

[0024] It should be noted that: Enclosure 1, as the overall load-bearing structure, provides protective space for the internal electrical components. One side of the disconnecting switch 11 is connected to the inner wall of enclosure 1. It is the core component for achieving circuit isolation and conduction, ensuring safe isolation of the circuit from the power supply during maintenance and repair, preventing accidental energization, and protecting personnel safety. The closing assembly is located inside enclosure 1 and precisely controls the opening and closing of the disconnecting switch 11 through mechanical or electrical drive. When the system needs circuit conduction, the closing assembly pushes the disconnecting switch 11 to close, creating a circuit connection; when circuit isolation is required, the closing assembly drives the disconnecting switch 11 to open, achieving reliable electrical isolation. The buffer assembly at the top of enclosure 1 uses elastic materials or a shock-absorbing structure design. During equipment operation, when external vibrations are transmitted to the enclosure, the buffer assembly absorbs the vibration energy through its own deformation, effectively reducing the transmission of vibration into enclosure 1 and minimizing the impact of vibration on internal electrical components such as relays and circuit boards. This avoids problems such as component loosening and poor contact caused by vibration, thereby extending the service life of the equipment and improving the stability and reliability of the medium-voltage switchgear.

[0025] In an embodiment of this utility model, the closing assembly includes a threaded rod 2 installed on the inner wall of the housing 1, and the threaded rod 2 is arranged opposite to the disconnect switch 11. A toothed plate 21 is threadedly connected to the outer side of the threaded rod 2. A gear 22 is meshed with the side of the toothed plate 21 near the disconnect switch 11. Both ends of the gear 22 are connected to support frames 23. The sides of the two support frames 23 near the toothed plate 21 are connected to the inner wall of the housing 1. An electric motor for driving the threaded rod 2 to rotate is installed at the inner top of the housing 1. An adjusting plate 24 is connected to the side of the gear 22 away from the toothed plate 21. Both ends of the adjusting plate 24 away from the gear 22 are connected to actuating plates 25. The two actuating plates 25 are located above and below the operating lever of the disconnect switch 11, respectively. There is a gap between the two actuating plates 25 and the operating lever.

[0026] It should be noted that the design of the closing component ensures precise control of the disconnector switch 11. This component includes a threaded rod 2 installed on the inner wall of the housing 1, with the threaded rod 2 positioned opposite to the disconnector switch 11. A toothed plate 21 is threadedly connected to the outer side of the threaded rod 2. When the motor located at the top of the housing 1 drives the threaded rod 2 to rotate, according to the principle of threaded transmission, the toothed plate 21 will move linearly along the axial direction of the threaded rod 2. A gear 22 is meshed with the side of the toothed plate 21 closest to the disconnector switch 11. Support frames 23 are connected to both ends of the gear 22. The sides of both support frames 23 closest to the toothed plate 21 are connected to the inner wall of the housing 1, providing stable support for the gear 22 and ensuring that the gear 22 can only rotate within the range limited by the support frames 23. As the toothed plate 21 moves linearly, it drives the meshing gear 22 to rotate. An adjusting plate 24 is connected to the side of the gear 22 furthest from the toothed plate 21. Both ends of the adjusting plate 24 furthest from the gear 22 are connected to actuating plates 25. The two actuating plates 25 are located above and below the operating lever of the disconnect switch 11, respectively, and have gaps between them and the operating lever. When the gear 22 rotates, it drives the adjusting plate 24 and the actuating plates 25 to rotate together. Through the cooperation of the actuating plates 25 and the operating lever of the disconnect switch 11, the operating lever is pushed or pulled, thereby realizing the opening and closing action of the disconnect switch 11, ultimately achieving circuit isolation and conduction. This closed component design, utilizing a mechanical transmission structure, achieves stable and reliable control of the disconnect switch 11, offering higher precision and stability compared to traditional control methods.

[0027] In an embodiment of this utility model, the buffer assembly includes a buffer plate 3, which is located above the housing 1. Slide rods 31 are installed around the top of the housing 1. The top of each slide rod 31 passes through the buffer plate 3 and is connected to a limit block 32. Two buffer springs 33 are sleeved on the outside of each slide rod 31, and the buffer springs 33 are located above and below the buffer plate 3, respectively.

[0028] It should be noted that the buffer assembly, as a key component ensuring the stable operation of the internal parts of the device, has a buffer plate 3 fixedly installed on top of the housing 1, serving as a stable base for the entire buffer structure. Slide rods 31 installed around the top of the housing 1 pass through the buffer plate 3, and limiting blocks 32 at the top of the slide rods 31 prevent other components from detaching from them. Two buffer springs 33, sleeved on the outer side of each slide rod 31, are located above and below the buffer plate 3, respectively. When external vibrations are transmitted to the housing 1, the housing 1 can slide up and down relative to the buffer plate 3 along the slide rods 31. The buffer springs 33 absorb vibration energy through compression and extension, effectively weakening the transmission of vibrations into the housing 1.

[0029] In an embodiment of this utility model, a suction cup electromagnet 4 is installed on the top of the buffer plate 3, and a power supply 41 is installed on the top of the buffer plate 3 on one side of the suction cup electromagnet 4. The suction cup electromagnet 4 is electrically connected to the power supply 41.

[0030] It should be noted that the suction cup electromagnet 4 installed on the top of the buffer plate 3 is electrically connected to the power supply 41. When the equipment is installed and fixed, the suction cup electromagnet 4 can be made to generate magnetism by being powered on, and it will be attracted to the inside of the switch cabinet. This not only further enhances the overall stability of the device and reduces the risk of displacement caused by vibration, but also allows the power supply 41 to control the power supply through a controller. The controller is existing technology and will not be described further here.

[0031] The working principle of the protection device for the medium-voltage switchgear provided by this utility model is as follows: When it is necessary to control the disconnecting switch 11 to close the circuit, the operator sends a closing command to the control system of the motor, and the motor is powered on and starts to run. The rotation of the motor drives the threaded rod 2 to rotate. Since the threaded rod 2 and the toothed plate 21 are connected by threads, according to the principle of thread transmission, the toothed plate 21 will move linearly along the axial direction of the threaded rod 2. The linear movement of the toothed plate 21 drives the gear 22 meshing with it to rotate around its axis. When the gear 22 rotates, it drives the adjusting plate 24 connected to one side to rotate synchronously, and the actuating plates 25 at both ends of the adjusting plate 24 also rotate accordingly. As the actuating plates 25 rotate, the actuating plates 25 located above and below the operating lever of the disconnecting switch 11 gradually approach the operating lever and push the operating lever, so that the contacts of the disconnecting switch 11 are closed, thereby realizing the conduction of the circuit. When circuit isolation is required, the control system sends a disconnect command, the motor rotates in reverse, driving the threaded rod 2 to rotate in reverse, the gear plate 21 moves linearly in the opposite direction, which in turn causes the gear 22 to rotate in reverse. The adjusting plate 24 and the actuating plate 25 also rotate in reverse. The actuating plate 25 pulls the operating lever of the isolating switch 11, causing the contacts of the isolating switch 11 to open, thus completing the circuit isolation. During the operation of the medium-voltage switchgear, if it is subjected to external vibration, the vibration is first transmitted to the enclosure 1. Since the top of the enclosure 1 is equipped with a sliding rod 31 around its perimeter, and a buffer spring 33 is sleeved on the outside of the sliding rod 31, the enclosure 1 can slide up and down relative to the buffer plate 3 along the sliding rod 31. When the enclosure 1 moves upward, the upper buffer spring 33 is compressed, absorbing vibration energy; when the enclosure 1 moves downward, the lower buffer spring 33 is compressed, similarly absorbing vibration energy. Through the compression and extension of the buffer spring 33, the transmission of vibration to the interior of the enclosure 1 is effectively reduced, protecting the internal electrical components. When installing this protective device, after placing it in a suitable position inside the switchgear, connect the power supply 41 to energize the suction cup electromagnet 4, causing it to become magnetic. The suction cup electromagnet 4 then adheres to the metal surface of the switchgear, thus firmly fixing the protective device inside the switchgear. When it is necessary to disassemble the device, disconnect the power supply 41; the suction cup electromagnet 4 will lose its magnetism, and the device can be easily removed.

[0032] The circuits and controls involved in this utility model are all existing technologies, and will not be described in detail here.

[0033] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A protection device for a medium-voltage switchgear, characterized in that, include: Box (1); The enclosure (1) is equipped with an isolation switch (11), and one side of the isolation switch (11) is connected to the inner wall of the enclosure (1). A closing component is provided inside the housing (1), and the closing component enables the isolation switch (11) to be opened and closed, thereby achieving circuit isolation and conduction. The top of the enclosure (1) is provided with a buffer assembly, which can effectively reduce the transmission of vibration to the inside of the enclosure (1) and reduce the impact of vibration on the internal electrical components.

2. The protection device for medium-voltage switchgear according to claim 1, characterized in that, The closing assembly includes a threaded rod (2) installed on the inner wall of the housing (1), and the threaded rod (2) is opposite to the disconnecting switch (11). The outer side of the threaded rod (2) is threadedly connected to a toothed plate (21). The toothed plate (21) is meshed with a gear (22) on the side near the disconnecting switch (11). Both ends of the gear (22) are connected to support frames (23). The two support frames (23) are connected to the inner wall of the housing (1) on the side near the toothed plate (21). An electric motor for driving the threaded rod (2) to rotate is installed at the inner top of the housing (1).

3. The protection device for medium-voltage switchgear according to claim 2, characterized in that, An adjusting plate (24) is connected to the side of the gear (22) away from the gear plate (21). Both ends of the adjusting plate (24) away from the gear (22) are connected to a toggle plate (25). The two toggle plates (25) are located above and below the operating lever of the disconnect switch (11), respectively.

4. The protection device for medium-voltage switchgear according to claim 3, characterized in that, There is a gap between each of the two toggle plates (25) and the operating lever.

5. The protection device for medium-voltage switchgear according to claim 4, characterized in that, The buffer assembly includes a buffer plate (3) located above the housing (1). Slide rods (31) are installed around the top of the housing (1). The top of each slide rod (31) passes through the buffer plate (3) and is connected to a limit block (32). Two buffer springs (33) are sleeved on the outside of each slide rod (31), and the buffer springs (33) are located above and below the buffer plate (3).

6. The protection device for medium-voltage switchgear according to claim 5, characterized in that, A suction cup electromagnet (4) is installed on the top of the buffer plate (3), and a power supply (41) is installed on the top of the buffer plate (3) on one side of the suction cup electromagnet (4). The suction cup electromagnet (4) is electrically connected to the power supply (41).

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