Multifunctional preventive test 10KV equipment electric test test bench

Abstract

The invention relates to the technical field of power equipment, in particular to a multifunctional preventive test 10KV equipment electrical test bench, which comprises a first sealing assembly and a second sealing assembly which are symmetrically arranged, and is characterized in that a base is arranged at the bottom of a circuit breaker, and a strut sleeve is arranged on the base; an arc extinguish chamber sleeve is arranged above the pillar sleeve, and a communication assembly is arranged in the arc extinguish chamber sleeve. The arc extinguish chamber sleeve is filled with gas so as to suppress electric arcs generated when the communication assembly is disconnected. The first sealing assembly and the second sealing assembly are further provided with detection assemblies. And when the first sealing assembly and the second sealing assembly are closed with the circuit breaker, the gas leaked from the arc extinguish chamber sleeve is detected through the detection assembly.

Description

Technical Field

[0001] This invention relates to the field of power equipment technology, specifically to a multifunctional preventive testing 10KV equipment electrical testing bench. Background Technology

[0002] Circuit breakers in 10kV equipment are the core protection devices of the power system, playing the role of "automatic switch." Their main function is to reliably close and disconnect load current during normal system operation, realizing the switching of operating modes. More importantly, when a short circuit, overload, or other fault occurs in a line or electrical equipment, it can quickly and accurately trip automatically, forcefully cutting off fault currents of up to tens of thousands of amperes, completely isolating the faulty part from the power grid, and preventing the fault from escalating.

[0003] SF6 gas is the core insulating and arc-extinguishing medium in circuit breakers. Its core functions are mainly reflected in two aspects: First, its excellent insulation performance. Under the same pressure, its insulation strength is much higher than that of air, effectively isolating high-voltage live parts from the grounding shell, ensuring the compactness and safe operation of the equipment. Second, its extremely strong arc-extinguishing capability. SF6 gas decomposes and absorbs a large amount of energy at the high temperature of an electric arc, and can quickly recombine after cooling; its excellent thermal conductivity and negative charge can quickly attract free electrons and extinguish the arc, thus efficiently and quickly cutting off fault currents far exceeding the rated current when the current crosses zero. The airtightness of 10kV circuit breakers is crucial, directly affecting equipment safety and power grid stability. If SF6 gas, the arc-extinguishing and insulating medium, leaks, the gas pressure in the arc-extinguishing chamber will drop, severely weakening its arc-extinguishing capacity and insulation strength. This could not only cause breaking failures and serious equipment damage, but also lead to insulation breakdown during operation, causing major power outages such as busbar short circuits. At the same time, it can also reduce gas replenishment, lower maintenance costs, and ensure the long-term reliable operation of the circuit breaker. Therefore, targeted preventive tests are needed for 10kV circuit breakers. Summary of the Invention

[0004] To achieve the above objectives, the present invention provides the following technical solution: A multifunctional preventive testing 10kV equipment electrical test bench includes a symmetrically arranged first sealing assembly and second sealing assembly. A circuit breaker to be tested is mounted on the operating platform. The first and second sealing assemblies on both sides of the circuit breaker are connected to the operating platform via guide rails. A base is provided at the bottom of the circuit breaker, and a support sleeve is mounted on the base. An arc-extinguishing chamber sleeve is mounted above the support sleeve, and a connecting assembly is installed within the arc-extinguishing chamber sleeve. The arc-extinguishing chamber sleeve is filled with gas to suppress the arc generated when the connecting assembly is disconnected. A detection assembly is also provided on the first and second sealing assemblies. When the first and second sealing assemblies are closed with the circuit breaker, the detection assembly detects any gas leaking from the arc-extinguishing chamber sleeve.

[0005] Furthermore, the connecting component includes a first disconnected state and a second disconnected state; when the closed connecting component is disconnected, the connecting component sequentially passes through the first disconnected state and the second disconnected state.

[0006] Furthermore, the connecting component includes a conductive movable end and a conductive fixed end; the conductive movable end is slidably disposed on a sealing seat, the sealing seat connecting the support sleeve and the arc-extinguishing chamber sleeve; a gas supply pipe is also disposed on the sealing seat; the conductive movable end is connected to the lower terminal through the sealing seat; the conductive fixed end is connected to the upper terminal through an upper insulator; the upper insulator is disposed at the upper end of the arc-extinguishing chamber sleeve.

[0007] Furthermore, the conductive moving end includes a movable conductive post and a conductive piston disposed on the upper end of the movable conductive post; the piston is provided with an outer conductive part and an inner conductive part disposed inside the outer conductive part; a conductive brush and a sealing ring are disposed between the movable conductive post and the sealing seat; the conductive fixed end includes a conductive ring and a stationary conductive post disposed inside the conductive ring.

[0008] Furthermore, the distance difference between the lower end of the stationary conductive post of the conductive fixed end and the lower end of the conductive ring is D; the distance difference between the upper end of the inner conductive part of the conductive moving end and the upper end of the outer conductive part is H; D is greater than H, so that in the first disconnected state of the connecting component, the conductive ring is disengaged from the outer conductive part, and the stationary conductive post remains in contact with the inner conductive part; in the second disconnected state of the connecting component, the conductive ring is disengaged from the outer conductive part, and the stationary conductive post is disengaged from the inner conductive part.

[0009] Furthermore, an insulating sleeve is provided at the upper end of the outer conductive part; the insulating sleeve guides the engagement of the static conductive post with the inner conductive part; a first through hole is provided on the piston, the first through hole connecting the cavity at the lower part of the piston and the cavity inside the outer conductive part; a second through hole is provided at the upper end of the outer conductive part, and a side through hole is provided on the upper outer surface of the outer conductive part.

[0010] Furthermore, the first sealing assembly and the second sealing assembly have the same structure and are symmetrically arranged, including a sliding seat and a bracket disposed on the sliding seat; the bracket is provided with a housing disposed opposite to it; the upper groove on the upper part of the housing corresponds to the upper insulator, the lower groove on the lower part of the housing corresponds to the lower insulator, and the wire groove in the middle of the housing corresponds to the lower terminal; the housings of the first sealing assembly and the second sealing assembly are provided with detection components that can abut against each other.

[0011] Furthermore, the detection component includes a base fixed in a mounting groove of the housing; a movable body is disposed in the base; a gas detection sensor is disposed in the movable body; an air supply component is disposed at the lower end of the base; and a first valve component is disposed at the end of the base near the sensor.

[0012] Furthermore, the first valve assembly includes a retaining ring that contacts the abutment portion of the movable body; the retaining ring is connected to a sealing disc via a support rod; a spring is sleeved on the support rod, with both ends of the spring abutting the retaining ring and the base respectively; the sealing disc is capable of sealing a first vent on the base; and the movable body is provided with a second vent and a third vent.

[0013] Furthermore, the air supply assembly includes a second valve assembly movably disposed in the base; a ball bearing is disposed at the top of the second valve assembly; the ball bearing abuts against the inclined surface at the lower end of the movable body; and a fan is disposed at the lower end of the base.

[0014] Beneficial effects Compared with the prior art, the present invention forms a sealed cavity around the circuit breaker by using two sealing components. The airtightness of the circuit breaker is preventively tested by a detection component. The detection component is in a closed state when the seal is opened, so as to avoid the sensor in the detection component being affected by the external air. The connecting component of the circuit breaker has a first and a second disconnected state, which mitigates the sudden interruption of current in the connecting component and suppresses the arc that may be generated when the connecting component is disconnected. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of the 10KV equipment electrical test bench for multifunctional preventive testing according to the present invention. Figure 2 This is a schematic diagram of the 10KV equipment electrical test bench of the present invention in the open state; Figure 3 This is a schematic diagram of the sealing assembly of the present invention; Figure 4 This is a schematic diagram of the structure of the connecting component of the present invention; Figure 5 This is a schematic diagram of the internal structure of the connecting component of the present invention; Figure 6(A) is a schematic diagram of the fully connected state of the connecting component of the present invention; Figure 6(B) is a state in which the conductive ring is disconnected from the outer conductive part; Figure 6(C) is a state in which the inner conductive end is disconnected from the static conductive post; and Figure 6(D) is a state in which the component is completely separated. Figure 7 This is a schematic diagram of the detection component of the present invention; Figure 8 This is a schematic diagram showing the push detection component when the sealing component of the present invention is closed; Figure 9This is a schematic diagram of the detection component in the closed state of the present invention; Figure 10 This is a schematic diagram of the detection component of the present invention in the open state; Figure 11 This is a schematic diagram of the internal structure of the detection component of the present invention; In the picture: First sealing assembly 1, second sealing assembly 10, sliding seat 11, bracket 12, housing 13, upper groove 131, lower groove 132, sealing ring 133, wire groove 134; Circuit breaker 3, base 31, support bushing 32, arc-extinguishing chamber bushing 33, lower terminal 34, upper terminal 35, lower insulator 36, upper insulator 37; Detection component 5, base 51, first air hole 511, moving body 52, inclined surface 521, second air hole 522, third air hole 523, abutment part 524, first valve assembly 53, fixing ring 531, spring 532, sealing plate 533, air supply assembly 54, fan 541, second valve assembly 542, ball bearing 543, base 540, valve hole 545, sensor 55; Connecting component 6, conductive moving end 61, moving conductive post 611, inner conductive part 612, outer conductive part 613, insulating sleeve 614, piston 615, conductive fixed end 62, static conductive post 621, conductive ring 622, sealing seat 63, air supply pipe 64, first through hole 65, side through hole 66, second through hole 67. Detailed Implementation

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] The following is based on the appendix Figure 1 -Appendix Figure 11The present invention provides a detailed description of a multifunctional preventative testing 10kV equipment electrical testing bench, comprising a symmetrically arranged first sealing assembly 1 and second sealing assembly 10. A circuit breaker 3 to be tested is mounted on the operating platform. The first sealing assembly 1 and second sealing assembly 10 on both sides of the circuit breaker 3 are connected to the operating platform via guide rails. A base 31 is provided at the bottom of the circuit breaker 3, and a support sleeve 32 is provided on the base 31. An arc-extinguishing chamber sleeve 33 is provided above the support sleeve 32, and a connecting assembly 6 is provided in the arc-extinguishing chamber sleeve 33. The arc-extinguishing chamber sleeve 33 is filled with gas to suppress the arc generated when the connecting assembly 6 is disconnected. A detection assembly 5 is also provided on the first sealing assembly 1 and second sealing assembly 10. When the first sealing assembly 1 and second sealing assembly 10 are closed with the circuit breaker 3, the detection assembly 5 detects the gas leaking from the arc-extinguishing chamber sleeve 33.

[0018] Specifically, the gas filled in the arc-extinguishing chamber bushing 33 is SF6 gas. The SF6 gas suppresses the arc that may be generated when the connecting component 6 is disconnected. SF6 gas is mainly used as an arc-extinguishing medium and an insulating medium in the circuit breaker. A gas replenishment device needs to be installed on the circuit breaker to ensure the gas concentration in the arc-extinguishing chamber. When the airtightness of the arc-extinguishing chamber decreases due to long time, it is easy to cause excessive SF6 gas leakage, which increases the maintenance frequency of the SF6 gas replenishment device. Therefore, it is necessary to test the airtightness of the 10KV circuit breaker 3 through preventive testing equipment.

[0019] The connecting component 6 includes a first disconnected state and a second disconnected state; when the closed connecting component 6 is disconnected, the connecting component 6 sequentially passes through the first disconnected state and the second disconnected state.

[0020] Specifically, the conductive moving end 61 and conductive fixed end 62 of the connecting component 6 have two sets of connecting components with different lengths. When the connecting component 6 is disconnected, it sequentially passes through a first disconnection state and a second disconnection state and completes a complete disconnection, which can reduce the intensity of the electric arc generated during the disconnection process. In the first disconnection state, the set of connecting components with a shorter overlap length is disconnected and the set of connecting components with a longer overlap length is in a connected state.

[0021] The connecting component 6 includes a conductive movable end 61 and a conductive fixed end 62; the conductive movable end 61 is slidably disposed on a sealing seat 63, the sealing seat 63 connecting the support sleeve 32 and the arc-extinguishing chamber sleeve 33; a gas supply pipe 64 is also disposed on the sealing seat 63; the conductive movable end 61 is connected to the lower terminal 34 through the sealing seat 63; the conductive fixed end 62 is connected to the upper terminal 35 through an upper insulator 37; the upper insulator 37 is disposed at the upper end of the arc-extinguishing chamber sleeve 33.

[0022] Specifically, the gas supply pipe 64 supplies SF6 gas to the arc-extinguishing chamber bushing 33, and the SF6 gas suppresses the generation of electric arc in the connecting component 6 when the circuit breaker is disconnected.

[0023] The conductive moving end 61 includes a movable conductive post 611 and a conductive piston 615 disposed on the upper end of the movable conductive post 611; the piston 615 is provided with an outer conductive part 613 and an inner conductive part 612 disposed inside the outer conductive part 613; a conductive brush and a sealing ring are disposed between the movable conductive post 611 and the sealing seat 63; the conductive fixed end 62 includes a conductive ring 622 and a stationary conductive post 621 disposed inside the conductive ring 622.

[0024] Specifically, the conductive ring 622 has an elastic structure, which increases the contact force when the conductive ring 622 contacts the outer conductive part 613. Both the outer conductive part 613 and the inner conductive part 612 are electrically connected to the moving conductive post 611 through the piston 615.

[0025] The distance difference between the lower end of the stationary conductive post 621 of the conductive fixed end 62 and the lower end of the conductive ring 622 is D; the distance difference between the upper end of the inner conductive part 612 of the conductive moving end 61 and the upper end of the outer conductive part 613 is H; D is greater than H, such that when the communication component 6 is in the first disconnected state, the conductive ring 622 is disengaged from the outer conductive part 613, and the stationary conductive post 621 remains in contact with the inner conductive part 612; when the communication component 6 is in the second disconnected state, the conductive ring 622 is disengaged from the outer conductive part 613, and the stationary conductive post 621 is disengaged from the inner conductive part 612.

[0026] The connecting component 6 achieves complete disconnection through a first disconnection state and a second disconnection state. In the first disconnection state, a portion of the current in the connecting component 6 is cut off, and in the second disconnection state, the current in the connecting component 6 is completely interrupted. By disconnecting in these two steps, the possibility of dielectric breakdown caused by the sudden interruption of current in the connecting component 6 can be reduced.

[0027] An insulating sleeve 614 is provided at the upper end of the outer conductive part 613; the insulating sleeve 614 guides the engagement of the static conductive post 621 with the inner conductive part 612; a first through hole 65 is provided on the piston 615, the first through hole 65 connects the cavity at the lower part of the piston 615 and the cavity inside the outer conductive part 613; a second through hole 67 is provided at the upper end of the outer conductive part 613, and a side through hole 66 is provided on the upper outer side of the outer conductive part 613.

[0028] Specifically, the insulating sleeve 614 has an annular structure and is located at the upper end of the outer conductive part 613 of the cylindrical structure. When the conductive moving end 61 engages with the conductive fixed end 62, the stationary conductive post 621 of the conductive fixed end 62 is inserted into the insulating sleeve 614 and enters the interior of the outer conductive part 613. During this process, the insulating sleeve 614 corrects the position of the stationary conductive post 621, guides the stationary conductive post 621 to insert into the inner conductive part 612 and achieves electrical conduction. The internal cavity of the arc-extinguishing chamber sleeve 33 is filled with high-pressure SF6 gas. When the connecting component 6 is disconnected, the piston 615 moves downward, and the SF6 gas passes through the first through hole 65 and generates airflow, which can suppress the electric arc that may be generated when the inner conductive part 612 and the static conductive post 621 lose contact. In the first disconnected state of the connecting component 6, the SF6 gas passes through the side through hole 66 and the second through hole 67, so that airflow is generated at the adjacent position when the outer conductive part 613 and the conductive ring 622 are disconnected, which suppresses the electric arc that may be generated when the outer conductive part 613 and the conductive ring 622 lose contact.

[0029] The first sealing assembly 1 and the second sealing assembly 10 have the same structure and are symmetrically arranged, including a sliding seat 11 and a bracket 12 disposed on the sliding seat 11; a housing 13 is disposed on the bracket 12 and disposed opposite to it; the upper groove 131 on the upper part of the housing 13 corresponds to the upper insulator 37, the lower groove 132 on the lower part of the housing 13 corresponds to the lower insulator 36, and the wire groove 134 in the middle of the housing 13 corresponds to the lower terminal 34; a detection component 5 that can abut against each other is disposed on the housing 13 of the first sealing assembly 1 and the second sealing assembly 10.

[0030] After the housing 13 of the first sealing assembly 1 and the second sealing assembly 10 closes and clamps the circuit breaker 3, a sealed cavity is formed around the circuit breaker 3. The detection assembly 5 is located in the sealed cavity and detects the concentration of SF6 gas in the sealed cavity. The circuit breaker 3 is tested for sealing performance as a preventive measure to prevent frequent maintenance caused by poor sealing performance of the circuit breaker 3.

[0031] The detection component 5 includes a base 51 fixed in the mounting groove of the housing 13; a movable body 52 is provided in the base 51; a gas sensor 55 is provided in the movable body 52; an air supply component 54 is provided at the lower end of the base 51; and a first valve component 53 is provided at the end of the base 51 near the sensor 55.

[0032] During the preventative test of circuit breaker 3, the housings 13 of the first sealing assembly 1 and the second sealing assembly 10 move towards each other, causing the detection components 5 on the two housings 13 to press against each other. This pushes the moving body 52 in the base 51 to slide. The movement of the moving body 52 opens the first valve assembly 53 and activates the air supply assembly 54 to deliver the gas in the sealed space enclosed by the housing 13 and the circuit breaker 3 into the sensor 55 inside the moving body 52. ​​This avoids the sensor 55's detection accuracy being affected by uneven distribution and insufficient diffusion of SF6 gas. When the first sealing assembly 1 and the second sealing assembly 10 are open, the first valve assembly 53 and the air supply assembly 54 of the detection component 5 are in the closed state, keeping the sensor 55 in a closed and clean environment, preventing impurities in the outside air from entering and affecting the gas detection accuracy of the sensor 55.

[0033] The first valve assembly 53 includes a retaining ring 531 that contacts the abutment portion 524 of the movable body 52; the retaining ring 531 is connected to a sealing disc 533 via a support rod; a spring 532 is sleeved on the support rod, and the two ends of the spring 532 abut against the retaining ring 531 and the base 51 respectively; the sealing disc 533 can seal the first air hole 511 on the base 51; the movable body 52 is provided with a second air hole 522 and a third air hole 523.

[0034] The air supply assembly 54 includes a second valve assembly 542 movably disposed in the base 540; a ball bearing 543 is disposed at the top of the second valve assembly 542; the ball bearing 543 abuts against the inclined surface 521 at the lower end of the movable body 52; and a fan 541 is disposed at the lower end of the base 540.

[0035] When the first sealing assembly 1 and the second sealing assembly 10 are closed, the detection assemblies 5 on the two housings 13 press against each other, pushing the moving body 52 to slide into the base 51. The abutting part 524 of the moving body 52 pushes the first valve assembly 53 to move to open the first air hole 511 on the base 51. The inclined surface 521 at the lower end of the moving body 52 pushes the ball 543, so that the second valve assembly 542 opens the valve hole 545 of the base 540. After the valve hole 545 is opened, the air in the sealed cavity around the circuit breaker 3 is sent to the sensor 55 through the valve hole 545 and the second air hole 522 by the fan 541.

[0036] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A multifunctional preventive testing 10kV equipment electrical test bench, comprising a first sealing assembly (1) and a second sealing assembly (10) symmetrically arranged, characterized in that: The circuit breaker (3) to be tested is placed on the operating table, and the first sealing component (1) and the second sealing component (10) on both sides of the circuit breaker (3) are connected to the operating table through the guide rail; The circuit breaker (3) is provided with a base (31) at the bottom, and a support sleeve (32) is provided on the base (31). An arc-extinguishing chamber sleeve (33) is provided above the support sleeve (32), and a connecting component (6) is provided in the arc-extinguishing chamber sleeve (33). The arc-extinguishing chamber sleeve (33) is filled with gas to suppress the electric arc generated when the connecting component (6) is disconnected; The first sealing assembly (1) and the second sealing assembly (10) are also provided with a detection assembly (5); When the first sealing assembly (1) and the second sealing assembly (10) are closed with the circuit breaker (3), the gas leaking from the arc-extinguishing chamber bushing (33) is detected by the detection assembly (5).

2. The 10KV equipment electrical testing bench according to claim 1, characterized in that: The connectivity component (6) includes a first disconnected state and a second disconnected state; When the closed connecting component (6) is disconnected, the connecting component (6) sequentially passes through the first disconnected state and the second disconnected state.

3. The 10KV equipment electrical testing bench according to claim 2, characterized in that: The connecting component (6) includes a conductive moving end (61) and a conductive fixed end (62). The conductive movable end (61) is slidably disposed on the sealing seat (63), and the sealing seat (63) is connected to the support sleeve (32) and the arc-extinguishing chamber sleeve (33). The sealing seat (63) is also provided with an air supply pipe (64). The conductive moving end (61) is connected to the lower terminal (34) through the sealing seat (63); The conductive fixed end (62) is connected to the upper terminal (35) through the upper insulator (37); The upper insulator (37) is disposed at the upper end of the arc-extinguishing chamber bushing (33).

4. The 10KV equipment electrical testing bench according to claim 3, characterized in that: The conductive moving end (61) includes a movable conductive post (611) and a conductive piston (615) disposed on the upper end of the movable conductive post (611). The piston (615) is provided with an outer conductive part (613) and an inner conductive part (612) disposed inside the outer conductive part (613). A conductive brush and a sealing ring are provided between the moving conductive post (611) and the sealing seat (63); The conductive fixed end (62) includes a conductive ring (622) and a static conductive post (621) disposed inside the conductive ring (622).

5. The 10KV equipment electrical testing bench according to claim 4, characterized in that: The distance difference between the lower end of the static conductive post (621) of the conductive fixed end (62) and the lower end of the conductive ring (622) is D; The distance difference between the upper end of the inner conductive part (612) and the upper end of the outer conductive part (613) of the conductive moving end (61) is H; The D is greater than the H, such that when the connecting component (6) is in the first disconnected state, the conductive ring (622) is disengaged from the outer conductive part (613), and the static conductive post (621) remains in contact with the inner conductive part (612). When the connecting component (6) is in the second disconnected state, the conductive ring (622) is out of contact with the outer conductive part (613), and the static conductive post (621) is out of contact with the inner conductive part (612).

6. The 10KV equipment electrical testing bench according to claim 5, characterized in that: An insulating sleeve (614) is provided at the upper end of the external conductive part (613). The insulating sleeve (614) guides the engagement of the static conductive post (621) with the inner conductive part (612); The piston (615) is provided with a first through hole (65), which connects the cavity at the bottom of the piston (615) and the cavity inside the external conductive part (613). The upper end of the outer conductive part (613) is provided with a second through hole (67), and the upper outer side surface of the outer conductive part (613) is provided with a side through hole (66).

7. The 10KV equipment electrical testing bench according to claim 1 or 6, characterized in that: The first sealing assembly (1) and the second sealing assembly (10) have the same structure and are symmetrically arranged, including a sliding seat (11) and a bracket (12) disposed on the sliding seat (11). The bracket (12) is provided with a housing (13) disposed opposite to it; The upper groove (131) on the upper part of the housing (13) corresponds to the upper insulator (37), the lower groove (132) on the lower part of the housing (13) corresponds to the lower insulator (36), and the wire groove (134) in the middle of the housing (13) corresponds to the lower terminal (34). The housing (13) of the first sealing assembly (1) and the second sealing assembly (10) are provided with detection components (5) that can abut against each other.

8. The 10KV equipment electrical testing bench according to claim 7, characterized in that: The detection component (5) includes a base (51) fixed in a mounting groove of the housing (13); The base (51) is provided with a movable body (52); The moving body (52) is equipped with a gas detection sensor (55); An air supply assembly (54) is provided at the lower end of the base (51). The base (51) is provided with a first valve assembly (53) at one end near the sensor (55).

9. The 10KV equipment electrical testing bench according to claim 8, characterized in that: The first valve assembly (53) includes a retaining ring (531) that contacts the abutment portion (524) of the movable body (52). The fixing ring (531) is connected to the sealing disc (533) via the support rod; A spring (532) is sleeved on the support rod, and the two ends of the spring (532) abut against the fixing ring (531) and the base (51) respectively. The sealing disc (533) can seal the first vent (511) on the base (51). The moving body (52) is provided with a second air hole (522) and a third air hole (523).

10. The 10KV equipment electrical testing bench according to claim 9, characterized in that: The air supply assembly (54) includes a second valve assembly (542) that is movably disposed in the base (540). The top of the second valve assembly (542) is provided with a ball (543); The ball (543) abuts against the inclined surface (521) at the lower end of the moving body (52); A fan (541) is provided at the lower end of the substrate (540).

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