Bus residual voltage holding device

Abstract

The utility model discloses a bus residual voltage maintaining device which comprises a cabinet body, a cabinet door is arranged in the middle of one side wall of the cabinet body, exhaust fans are installed on the cabinet door and the lower end of one side wall of the cabinet body, a filter screen is fixed on the outer side of each exhaust fan, and a temperature sensor is arranged on the cabinet door and located at the lower end of each exhaust fan. A first groove is formed in the upper end of the side wall, opposite to the cabinet door, of the cabinet body. The device has the beneficial effects that by designing the extension rods, the fixing blocks and the rubber pads, the back of the device can be prevented from making direct contact with the wall surface, and the heat dissipation effect of the louver is guaranteed; meanwhile, through the design of an inserting rod, an inserting hole and a fastening nut, the mounting plate can be conveniently mounted and dismounted at any time, and the working time of a worker at a fixed position can be greatly saved; besides, through the design of an electric sliding block and a sliding rail, the height of the mounting plate can be adjusted according to the height of an electrical element on the mounting plate, so that the use flexibility of the device under different conditions is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of busbar residual pressure maintaining devices, in particular to a busbar residual pressure maintaining device. Background Art

[0002] A short circuit in any path of the medium-voltage power grid may cause a serious drop in the bus voltage in the non-fault area. The voltage will not return to normal until the faulty branch is removed in about 100ms. During the voltage sag lasting about 100ms, some AC contactors’ low-voltage protection will release without pressure, causing important auxiliary equipment to stop operating and even trip the main machine. Some frequency conversion equipment will stop supplying power, causing important production equipment to stop operating or generate waste and exhaust gas, and some equipment will not be able to work normally.

[0003] The Chinese patent with patent number CN202321740019.0 discloses a busbar residual pressure holding device, including a holding device body, a base rod is fixedly installed on the side end of the holding device body, a telescopic rod is movably installed on the side end of the base rod, a spring is provided on the outer wall of the base rod, a protective plate is fixedly installed on the side end of the telescopic rod, a suction cup is fixedly installed on the side end of the protective plate, and a control component is installed in series inside the holding device body. The control component includes a fast circuit breaker, a mother protection reactor, a current collector and a mother protection controller. The output end of the current collector and the input end of the fast circuit breaker are connected in series to form a path, the mother protection reactor is connected in parallel with the path to form a short-circuit protection circuit, and the mother protection controller is connected in series to the output end of the current collector.

[0004] The busbar residual pressure holding device described in the above patent realizes timely detection and protection of busbar residual pressure in the busbar protection of high-voltage AC power system, and can quickly cut off the fault circuit. Although the above method can protect the safe and stable operation of the power system, when the device is used, most of the time, the heat in the device is only discharged through the heat dissipation network, and when the device is placed against the wall, the heat dissipation network is easily blocked, and the electrical components in the device are easily damaged under long-term high temperature conditions; at the same time, when the existing busbar residual pressure holding device is installed, replaced or repaired for each electrical component, the fixed structure of the device requires the staff to install parts in the device for a long time. The narrow range will affect the installation efficiency of the staff, resulting in more complicated operating steps for the staff; in addition, the existing busbar residual pressure holding device is mostly an integrated structure. When the device is used in different working conditions, overly large electrical components are not convenient to install, which leads to greater limitations on the use of the device. Summary of the Invention

[0005] The purpose of the present utility model is to provide a busbar residual pressure maintaining device in order to solve the above problems.

[0006] The utility model achieves the above-mentioned purpose through the following technical solutions:

[0007] The busbar residual pressure maintaining device includes a cabinet body, a cabinet door is provided in the middle of one side wall of the cabinet body, and exhaust fans are installed on the cabinet door and the lower end of one side wall of the cabinet body, a filter is fixed on the outside of the exhaust fan, and a temperature sensor is provided on the cabinet door at the lower end of the exhaust fan, a groove one is provided at the upper end of the side wall of the cabinet body opposite to the cabinet door, a shutter is arranged in the groove one, and two extension rods are symmetrically provided at the lower end of the shutter, a fixing block is installed at one end of the extension rod, and a rubber pad is arranged on the outer wall of the fixing block, a control box is provided at the top end of the cabinet body, four slide rails are symmetrically installed on both side walls of the cabinet body, and an electric slider is arranged on the slide rail, a plug rod is fixed to the middle of the top of the electric slider, the plug rod is connected to the mounting plate through a socket, there are two mounting plates, and a fastening nut is provided at the upper end of the plug rod.

[0008] Furthermore, an operation panel is provided on one side wall of the cabinet body, located on the upper side of the cabinet door, an indicator light is installed at the lower end of the operation panel, a switch is arranged on one side of the operation panel, an ammeter is fixed at the lower end of the switch, a safety lock is provided on one side of the cabinet door, two grooves are symmetrically provided on both sides of the top of the mounting plate, four rows of wiring holes are provided in the middle of the top of the mounting plate, and four supporting legs are installed at the four corners of the bottom end of the cabinet body.

[0009] By adopting the above technical solution, the cabinet realizes the installation protection of each electrical component of the device, can quickly restore the bus voltage, quickly isolate the fault, automatically resume operation, and has remote communication function and event memory function.

[0010] Furthermore, a common circuit breaker, a mother protection controller, a current collector, a mother protection reactor and a fast circuit breaker are installed in series in the control box.

[0011] By adopting the above technical solution, the control box realizes the installation protection of the control element, and determines an output quantity according to an input quantity through certain rules and algorithms, thereby realizing the control of the entire system.

[0012] Furthermore, the operation panel, the indicator light and the ammeter are all connected to the control box slot, the safety lock is connected to the cabinet door screw, and the cabinet door is connected to the cabinet hinge.

[0013] By adopting the above technical solution, the operation panel can conveniently control the operation of various parts of the device, the indicator light can conveniently display the operating status of various working parts in the device, and the safety lock can prevent someone from opening and closing the cabinet door at will, thereby ensuring the safety of the internal components of the device.

[0014] Furthermore, the second groove, the jack and the wiring hole are all formed on the mounting plate, and the support legs are connected to the cabinet body with screws.

[0015] By adopting the above technical solution, the design of the groove 2 makes it convenient to take out the installation plate, and the design of the wiring hole makes it convenient to route the various electrical components, thereby ensuring the neatness of the circuits in the device.

[0016] Furthermore, the common circuit breaker, the mother protection controller, the current collector, the mother protection reactor and the fast circuit breaker are all electrically connected to the operation panel.

[0017] By adopting the above technical solution, when the device body is operating normally, the fast circuit breaker is in the closed state, the main protection reactor is short-circuited by the fast circuit breaker, and there is no voltage drop. When a short-circuit fault occurs in the device's downstream line or switch, the main protection controller quickly identifies and determines it, and issues a trip signal command. The fast circuit breaker quickly opens, and the short-circuit current is diverted into the current-limiting reactor. While limiting the short-circuit current, the upper bus voltage is maintained at above 90% of the rated voltage, ensuring the normal operation of other fault-free areas or branch sensitive loads.

[0018] Furthermore, the exhaust fan is connected to the cabinet door and the cabinet body through a slot, and the filter is connected to the cabinet door and the cabinet body through screws.

[0019] By adopting the above technical solution, when the temperature sensor detects that the temperature inside the device is too high, the staff can turn on the exhaust fan to assist in heat dissipation in the device, avoid burning of components due to heat accumulation in the device, and effectively ensure the service life of the device.

[0020] Furthermore, the groove is formed on the cabinet body, the shutter is connected to the groove by screws, the extension rod is threadedly connected to the cabinet body, and the temperature sensor is plugged into the cabinet door.

[0021] By adopting the above technical solution, the groove can be used to fix the shutter, and the design of the shutter can achieve daily heat dissipation of the device.

[0022] Furthermore, the fixing block is connected to the extension rod by screws, the rubber pad is bonded to the fixing block, and the slide rail is connected to the cabinet by screws.

[0023] By adopting the above technical solution, the extension rod is combined with the design of the fixing block to avoid the back of the device directly contacting the wall, thereby ensuring the normal operation of the blinds. At the same time, combined with the design of the rubber pad, the friction between the fixing block and the wall can be effectively increased, thereby preventing the fixing block from damaging the wall.

[0024] Furthermore, the insertion rod is screwed to the electric slider, the mounting plate is connected to the electric slider slot, and the fastening nut is screwed to the insertion rod.

[0025] By adopting the above technical solution, the insertion rod cooperates with the design of the slot to realize the limiting fixation of the electric slider to the mounting plate, and cooperates with the design of the fastening nut to effectively ensure the stability of the mounting plate.

[0026] The specific working principle is: when using the device, the busbar residual pressure holding device is installed in a suitable position to facilitate detection of changes and control and adjustment. When wiring, the mounting plate can be removed, and the electrical components, wires, etc. can be installed and fixed. Then the socket of the mounting plate is inserted into the plug rod, and the design of the fastening nut is used to facilitate the fixation of the mounting plate. When installing the mounting plate, the height of the electric slider can be adjusted according to the size of the electrical components and the length of the wires, ensuring the flexibility of the device during use. The wiring should meet the requirements to avoid problems caused by wiring errors or poor contact. Regular maintenance is required to ensure its normal operation and reliability. It should be used in a dry, ventilated environment without corrosive gases and open flames. When the device is operating normally, the fast circuit breaker is in the closed state, the mother protection reactor is short-circuited by the fast circuit breaker, and there is no voltage drop. When a short circuit fault occurs in the lower line or switch of the device, the mother protection controller quickly identifies and judges, and sends a trip signal command. The fast circuit breaker is quickly disconnected, and the short-circuit current is converted into the current-limiting reactor. While limiting the short-circuit current, the upper bus voltage is maintained at more than 90% of the rated voltage to ensure the normal operation of other fault-free areas or branch sensitive loads. With the design of the extension rod and the fixed block, it can effectively avoid the heat dissipation obstruction caused by the blinds being close to the wall. At the same time, with the temperature sensor detecting the temperature inside the device, the staff can control the exhaust fan to perform auxiliary work to ensure the stable operation of the device.

[0027] The beneficial effects of the present invention are:

[0028] In order to solve the problem that the existing bus residual voltage maintaining device realizes timely detection and protection of bus residual voltage in bus protection of high-voltage AC power system and can quickly cut off the fault circuit, although the above method can protect the safe and stable operation of the power system, when the device is used, most of them only discharge the heat in the device through the heat dissipation network, and when the device is placed against the wall, the heat dissipation network is easily blocked, and the electrical components in the device are prone to damage under long-term high temperature conditions. The utility model can avoid the back of the device from directly contacting the wall by designing an extension rod, a fixing block and a rubber pad, thereby ensuring the heat dissipation effect of the blinds. At the same time, when the temperature sensor detects that the temperature inside the device exceeds the standard, the staff can control to open the exhaust fan to promote the discharge of heat in the device, effectively ensuring the service life of the device;

[0029] In order to solve the problem that the existing busbar residual pressure holding device has a fixed structure that requires workers to install parts in the device for a long time when installing, replacing or repairing various electrical components, and the narrow range affects the installation efficiency of workers, resulting in more complicated operation steps for workers, the utility model is convenient for installing and disassembling the mounting plate at any time through the design of the insertion rod, the insertion hole and the fastening nut. After the electrical components are installed, the mounting plate is assembled, which can greatly save the time of workers working in a fixed position and ensure the efficiency of device assembly;

[0030] In order to solve the problem that the existing busbar residual pressure retaining devices are mostly integrated structures, when the devices are used in different working conditions, overly large electrical components are inconvenient to install, which leads to greater limitations on the use of the devices, the utility model uses the design of an electric slider and a slide rail. When installing electrical components on the retaining device, the electric slider can be controlled to extend and retract up and down, so that the upper and lower mounting plates can be installed separately, and the height of the mounting plate can be adjusted according to the height of the electrical components on the mounting plate, so as to achieve flexibility in the use of the device in different situations. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a front view of the busbar residual pressure maintaining device of the utility model;

[0032] Figure 2 This is a back view of the busbar residual pressure maintaining device of the present invention;

[0033] Figure 3 It is a top sectional view of the cabinet in the busbar residual pressure holding device of the present utility model;

[0034] Figure 4 This is the electrical principle diagram of the busbar residual voltage holding device of the utility model;

[0035] Figure 5It is a main sectional view of the cabinet in the busbar residual pressure maintaining device described in the present utility model.

[0036] The following are the descriptions of the reference numerals:

[0037] 1. Cabinet body; 2. Operation panel; 3. Indicator light; 4. Cabinet door; 5. Exhaust fan; 6. Switch; 7. Control box; 8. Ammeter; 9. Safety lock; 10. Temperature sensor; 11. Filter; 12. Extension rod; 13. Support leg; 14. Fastening nut; 15. Mounting plate; 16. Groove 2; 17. Insert rod; 18. Electric slider; 19. Slide rail; 20. Socket; 21. Wiring hole; 22. Ordinary circuit breaker; 23. Mother protection controller; 24. Current collector; 25. Mother protection reactor; 26. Fast circuit breaker; 27. Groove 1; 28. Shutter; 29. ​​Fixing block; 30. Rubber pad. DETAILED DESCRIPTION

[0038] The present invention will be further described below with reference to the accompanying drawings:

[0039] like Figure 1-Figure 5As shown, the busbar residual pressure maintaining device includes a cabinet 1, and a cabinet door 4 is provided in the middle of one side wall of the cabinet 1 to facilitate installation and maintenance in the cabinet 1. The cabinet door 4 and the lower end of one side wall of the cabinet 1 are both equipped with an exhaust fan 5, and a filter 11 is fixed on the outside of the exhaust fan 5. A temperature sensor 10 is provided on the cabinet door 4 at the lower end of the exhaust fan 5. When the temperature sensor 10 detects that the temperature in the device is too high, the staff can turn on the exhaust fan 5 to assist in the heat dissipation in the device, avoid the burning of parts caused by heat accumulation in the device, and effectively ensure the service life of the device. A groove 27 is provided at the upper end of the side wall of the cabinet 1 opposite to the cabinet door 4, and a shutter 28 is arranged in the groove 27. Two extension rods 12 are symmetrically provided at the lower end of the shutter 28, and a fixing block 29 is installed at one end of the extension rod 12. A rubber pad 30 is arranged on the outer wall of the fixing block 29. The design of the extension rod 12 and the fixing block 29 can avoid the device The back is directly in contact with the wall, ensuring the normal operation of the shutters 28. At the same time, the design of the rubber pad 30 can effectively increase the friction between the fixing block 29 and the wall, preventing the fixing block 29 from damaging the wall. A control box 7 is provided at the top of the cabinet 1, and four slide rails 19 are symmetrically installed on the two side walls of the cabinet 1. An electric slider 18 is arranged on the slide rail 19, and a plug rod 17 is fixed to the middle part of the top of the electric slider 18. The plug rod 17 is connected to the mounting plate 15 through the socket 20. Through the design of the electric slider 18 and the slide rail 19, when installing electrical components on the retaining device, the electric slider 18 can be controlled to extend and retract up and down to realize the separate installation of the upper and lower mounting plates 15, and the height of the mounting plate 15 can be adjusted according to the height of the electrical components on the mounting plate 15 to achieve flexibility in use of the device in different situations. There are two mounting plates 15, and a fastening nut 14 is provided on the upper end of the plug rod 17 to facilitate the fixation of the mounting plate 15.

[0040] In this embodiment, an operation panel 2 is provided on one side wall of the cabinet 1, located on the upper side of the cabinet door 4, an indicator light 3 is installed at the lower end of the operation panel 2, a switch 6 is arranged on one side of the operation panel 2, an ammeter 8 is fixed to the lower end of the switch 6, a safety lock 9 is provided on one side of the cabinet door 4, two grooves 16 are symmetrically provided on both sides of the top of the mounting plate 15, four rows of wiring holes 21 are provided in the middle of the top of the mounting plate 15, four supporting legs 13 are installed at the four corners of the bottom end of the cabinet 1, the cabinet 1 realizes the installation protection of various electrical components of the device, can quickly restore the bus voltage, quickly isolate faults, automatically resume operation, and has remote communication function and event memory function.

[0041] In this embodiment, a conventional circuit breaker 22, a main protection controller 23, a current collector 24, a main protection reactor 25, and a fast circuit breaker 26 are installed in series in the control box 7. The control box 7 implements installation protection for control elements and determines an output quantity based on an input quantity through certain rules and algorithms, thereby achieving control of the entire system.

[0042] In this embodiment, the operation panel 2, the indicator light 3 and the ammeter 8 are all connected to the control box 7 slot, the safety lock 9 is screwed to the cabinet door 4, and the cabinet door 4 is hinged to the cabinet body 1. The operation panel 2 facilitates the control of the operation of various parts of the device, and the indicator light 3 facilitates the display of the operating status of various working parts in the device. The safety lock 9 can prevent someone from opening and closing the cabinet door 4 at will, thereby ensuring the safety of the internal components of the device.

[0043] In this embodiment, the groove 2 16, the jack 20 and the wiring hole 21 are all formed on the mounting plate 15, and the support leg 13 is connected to the cabinet body 1 by screws. The design of the groove 2 16 facilitates the removal of the mounting plate 15, and the design of the wiring hole 21 facilitates the wiring of various electrical components, thereby ensuring the neatness of the circuits in the device.

[0044] In this embodiment, the ordinary circuit breaker 22, the mother protection controller 23, the current collector 24, the mother protection reactor 25 and the fast circuit breaker 26 are all electrically connected to the operation panel 2. When the device body is operating normally, the fast circuit breaker 26 is in a closed state, the mother protection reactor 25 is short-circuited by the fast circuit breaker 26, and there is no voltage drop. When a short circuit fault occurs in the lower-level line or switch of the device, the mother protection controller 23 quickly identifies and judges, and issues a trip signal command. The fast circuit breaker 26 is quickly disconnected, and the short-circuit current is commutated into the current-limiting reactor. While limiting the short-circuit current, the upper bus voltage is maintained at more than 90% of the rated voltage, ensuring the normal operation of other fault-free areas or branch sensitive loads.

[0045] In this embodiment, the exhaust fan 5 is connected to the cabinet door 4 and the cabinet body 1 by a slot, and the filter 11 is screwed to the cabinet door 4 and the cabinet body 1. When the temperature sensor 10 detects that the temperature inside the device is too high, the staff can turn on the exhaust fan 5 to assist in heat dissipation in the device, avoid burning of components due to heat accumulation in the device, and effectively ensure the service life of the device.

[0046] In this embodiment, the groove 27 is formed on the cabinet body 1, the shutter 28 is screwed to the groove 27, and the extension rod 12 is threadedly connected to the cabinet body 1, which is convenient for disassembly at any time. The temperature sensor 10 is plugged into the cabinet door 4, and the groove 27 is convenient for fixing the shutter 28. The design of the shutter 28 can achieve daily heat dissipation of the device.

[0047] In this embodiment, the fixing block 29 is screwed to the extension rod 12, the rubber pad 30 is bonded to the fixing block 29, and the slide rail 19 is screwed to the cabinet 1. The extension rod 12 cooperates with the design of the fixing block 29 to avoid the back of the device directly contacting the wall, thereby ensuring the normal operation of the blinds 28. At the same time, the design of the rubber pad 30 can effectively increase the friction between the fixing block 29 and the wall, thereby preventing the fixing block 29 from damaging the wall.

[0048] In this embodiment, the insertion rod 17 is connected to the electric slider 18 by screws, the mounting plate 15 is connected to the electric slider 18 by a slot, and the fastening nut 14 is screwed to the insertion rod 17. The insertion rod 17 cooperates with the design of the slot to realize the limiting fixation of the mounting plate 15 by the electric slider 18. Cooperating with the design of the fastening nut 14, the stability of the mounting plate 15 can be effectively guaranteed.

[0049] The specific working principle is: when using the device, the busbar residual pressure holding device is installed in a suitable position to facilitate detection of changes and control and adjustment. When wiring, the mounting plate 15 can be removed, and the electrical components, wires, etc. can be installed and fixed. Then, the socket 20 of the mounting plate 15 is inserted into the plug rod 17, and the design of the fastening nut 14 is used to facilitate the fixation of the mounting plate 15. When installing the mounting plate 15, the height of the electric slider 18 can be adjusted according to the size of the electrical components and the length of the wires, ensuring the flexibility of the device during use. The wiring should meet the requirements to avoid problems caused by wiring errors or poor contact. Regular maintenance is required to ensure its normal operation and reliability. It should be used in a dry, ventilated environment without corrosive gases and open flames. When the device body is operating normally, the fast circuit breaker 26 is in the closed state, the mother protection reactor 25 is short-circuited by the fast circuit breaker 26, and there is no voltage drop. When a short circuit fault occurs in the lower line or switch of the device, the mother protection controller 23 quickly identifies and judges, and issues a tripping signal command. The fast circuit breaker 26 is quickly disconnected, and the short-circuit current is converted into the current-limiting reactor. While limiting the short-circuit current, the upper bus voltage is maintained at more than 90% of the rated voltage to ensure the normal operation of other fault-free areas or branch sensitive loads. In conjunction with the design of the extension rod 12 and the fixing block 29, it can effectively avoid the heat dissipation obstruction caused by the shutter 28 being close to the wall. At the same time, in conjunction with the temperature sensor 10 detecting the temperature inside the device, the staff can control the exhaust fan 5 to perform auxiliary work to ensure the stable operation of the device.

[0050] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention, and such changes and improvements shall fall within the scope of the present invention as claimed.

Claims

1. Busbar residual pressure holding device, characterized in that: The cabinet comprises a cabinet body (1), a cabinet door (4) is arranged in the middle of one side wall of the cabinet body (1), an exhaust fan (5) is installed on the cabinet door (4) and the lower end of one side wall of the cabinet body (1), a filter screen (11) is fixed on the outer side of the exhaust fan (5), a temperature sensor (10) is arranged on the cabinet door (4) at the lower end of the exhaust fan (5), a groove (27) is opened at the upper end of the side wall of the cabinet body (1) opposite to the cabinet door (4), a shutter (28) is arranged in the groove (27), two extension rods (12) are symmetrically arranged at the lower end of the shutter (28), and the A fixing block (29) is installed at one end of the extension rod (12), and a rubber pad (30) is arranged on the outer wall of the fixing block (29). A control box (7) is arranged at the top of the cabinet (1), and four slide rails (19) are symmetrically installed on the two side walls of the cabinet (1). An electric slider (18) is arranged on the slide rails (19), and a plug rod (17) is fixed at the middle of the top of the electric slider (18). The plug rod (17) is connected to the mounting plate (15) through a socket (20), and the mounting plate (15) has two. A fastening nut (14) is arranged at the upper end of the plug rod (17).

2. The busbar residual pressure holding device according to claim 1, characterized in that: An operation panel (2) is provided on one side wall of the cabinet body (1) at the upper side of the cabinet door (4); an indicator light (3) is installed at the lower end of the operation panel (2); a switch (6) is arranged on one side of the operation panel (2); an ammeter (8) is fixed at the lower end of the switch (6); a safety lock (9) is provided on one side of the cabinet door (4); two grooves (16) are symmetrically provided on both sides of the top of the installation plate (15); four rows of wiring holes (21) are provided in the middle of the top of the installation plate (15); and four legs (13) are installed at the four corners of the bottom of the cabinet body (1).

3. The busbar residual pressure holding device according to claim 2, characterized in that: A common circuit breaker (22), a mother protection controller (23), a current collector (24), a mother protection reactor (25) and a fast circuit breaker (26) are installed in series in the control box (7).

4. The busbar residual pressure holding device according to claim 2, characterized in that: The operation panel (2), the indicator light (3) and the ammeter (8) are all connected to the card slot of the control box (7), the safety lock (9) is screw-connected to the cabinet door (4), and the cabinet door (4) is hinge-connected to the cabinet body (1).

5. The busbar residual pressure holding device according to claim 2, characterized in that: The second groove (16), the plug hole (20) and the wiring hole (21) are all formed on the mounting plate (15), and the support foot (13) is connected to the cabinet body (1) by screws.

6. The busbar residual pressure holding device according to claim 3, characterized in that: The common circuit breaker (22), the mother protection controller (23), the current collector (24), the mother protection reactor (25) and the fast circuit breaker (26) are all electrically connected to the operation panel (2).

7. The busbar residual pressure holding device according to claim 1, characterized in that: The exhaust fan (5) is connected to the cabinet door (4) and the cabinet body (1) by means of a slot, and the filter (11) is connected to the cabinet door (4) and the cabinet body (1) by means of screws.

8. The busbar residual pressure holding device according to claim 1, characterized in that: The groove one (27) is formed on the cabinet body (1), the shutter (28) is screw-connected to the groove one (27), the extension rod (12) is threadedly connected to the cabinet body (1), and the temperature sensor (10) is plugged into the cabinet door (4).

9. The busbar residual pressure holding device according to claim 1, characterized in that: The fixing block (29) is screw-connected to the extension rod (12), the rubber pad (30) is bonded to the fixing block (29), and the slide rail (19) is screw-connected to the cabinet (1).

10. The busbar residual pressure holding device according to claim 1, characterized in that: The insertion rod (17) is screw-connected to the electric slider (18), the mounting plate (15) is slot-connected to the electric slider (18), and the fastening nut (14) is screw-connected to the insertion rod (17).

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