A movable grounding switch and its use method

Abstract

The present invention discloses a movable earthing knife switch and a method for using the same, and belongs to the technical field of gas-insulated metal-enclosed switchgear. Through the coordinated cooperation of a driving component, a transmission component, a moving contact, a moving side shield and a static side shield, the driving component drives the transmission component, and then drives the moving contact to move, so that the moving contact and the static side shield can be brought into contact and disengaged, thereby realizing the closing and opening functions of the movable earthing knife switch. In addition, a double-flow mode is adopted by the static side shield to realize the grounding function, and the movable earthing knife switch can be assembled at any busbar contact mounting end and can be reused. A test operator can perform remote operation, thereby reducing the time for entering and exiting the test area and working operations, and greatly improving the safety performance. The present invention has simple manufacturing and processing, simple structure, convenient installation and disassembly, and is suitable for factory mass production.

Description

Technical Field

[0001] The invention relates to the technical field of gas-insulated metal-enclosed switchgear, and in particular to a movable grounding switch and a use method thereof. Background Art

[0002] Gas-insulated metal-enclosed switchgear (hereinafter referred to as GIS equipment) consists of circuit breakers, disconnectors, grounding switches, transformers, lightning arresters, busbars, etc.

[0003] When the components of GIS equipment are undergoing factory tests, for components with breaks, insulation tests between the breaks are required when necessary, and either side of the break component needs to be set to a grounded state. Due to the influence of its assembly site and transportation conditions, especially for ultra-high voltage equipment, most of them adopt a component-based production method, including circuit breaker components. Each circuit breaker needs to undergo insulation tests between breaks and insulation tests to ground when the circuit breaker is closed.

[0004] When conducting the circuit breaker closing-to-ground and break insulation test, the circuit breaker needs to be set to the closing state, one side of it is connected to the transformer, and the voltage is loaded for testing. After the test is completed, the circuit breaker needs to be manually opened and the other side is grounded. If necessary, it needs to be connected to the busbar before the insulation test is performed. This process is labor-intensive, has many interfaces, and requires an intermediate transition gas chamber. The test process is cumbersome, and the test personnel need to repeatedly shuttle between the test areas. The operation time is long and the safety performance is not high. Summary of the invention

[0005] In order to solve the technical problems that the test process of insulation test is complicated and the safety cannot be guaranteed, the present invention provides a movable grounding switch and a method of using the same, which can complete the insulation test of the test element through remote operation without the need for on-site operation by test personnel.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solution:

[0007] A movable grounding knife switch comprises a static side component, a dynamic side component and a driving component;

[0008] The moving side assembly comprises a moving side housing, on which a transmission assembly and a moving contact are mounted;

[0009] The driving end of the transmission assembly is fixedly connected to the driving assembly, and the driving end of the transmission assembly is rotationally connected to the moving contact;

[0010] A moving side shield is provided on the moving contact;

[0011] The static side assembly comprises a static side shell, and a static side shield is arranged inside the static side shell;

[0012] A hole is formed at one end of the static side shell, and one end of the dynamic side shield is fixed in the hole of the static side shell;

[0013] The other end of the static side housing is an opening structure for installing a test element;

[0014] The inner wall of the static side shield is connected with a busbar terminal guide sleeve for fixing the wiring terminal of the test element;

[0015] One end of the static side shield is an opening structure for installing a test element, and an inner guide contact for contacting a wiring terminal of the test element is connected to the inner wall of the static side shield near the opening;

[0016] A through hole is formed at the other end of the static side shield, and an external current guide contact is provided on the inner wall of the through hole;

[0017] The moving contact can move into the through hole along its axial direction and can achieve electrical contact with the outer current guiding contact.

[0018] Furthermore, the transmission assembly includes a guide device, an axle pin, a transmission connecting plate, a rotating crank arm and a moving contact axle pin;

[0019] The guide device is fixed on the moving side housing;

[0020] One end of the transmission link plate is fixed to the guide device through an axle pin, and the other end is connected to the moving contact through a moving contact axle pin, and the midpoint of the transmission link plate is connected to one end of the rotating crank arm;

[0021] The other end of the rotating crank arm is rotatably arranged on the movable side housing and is hingedly connected to the transmission shaft of the driving assembly through an axle pin.

[0022] Furthermore, the static side shielding and the busbar end guide sleeve are connected by interference fit.

[0023] Furthermore, the busbar end guide sleeve is made of polystyrene.

[0024] Furthermore, the moving-side shield is fixed to the stationary-side housing via a moving contact seat, and the moving contact is arranged on the moving contact seat.

[0025] Further, the driving assembly includes an electric mechanism and an operating table;

[0026] The electric mechanism is connected to the driving end of the transmission assembly through a transmission shaft;

[0027] The electric mechanism is connected to the operating table via a control cable.

[0028] Further, comprising an insulating plate;

[0029] The stationary side housing and the moving side housing are respectively connected to the insulating plate, and the stationary side housing and the moving side housing are electrically connected via a grounding wire.

[0030] Furthermore, after the test element is installed, an independent air chamber is formed between the test element and the stationary side shell.

[0031] Furthermore, one end of the static side shielding provided with a through hole is spherical, and the other end of the static side shielding for mounting the test element is cylindrical.

[0032] A method for using a movable grounding knife switch, based on the above movable grounding knife switch, comprises the following steps:

[0033] Install the movable earthing knife switch on the test element, start the driving assembly to drive the transmission assembly to rotate, and then drive the moving contact to move upward, so that the moving contact is completely moved to the inside of the moving side shield and completely separated from the static side shield, completing the opening of the movable earthing knife switch, and performing an insulation test on the test element;

[0034] Start the drive assembly again to drive the transmission assembly to rotate, and then drive the moving contact to move downward, so that the moving contact and the static side shield are fully electrically contacted, the movable earthing switch is closed, and the insulation test between the test component breaks is carried out.

[0035] Compared with the prior art, the present invention has the following beneficial effects:

[0036] The present invention provides a movable earthing knife switch, which cooperates with a driving component, a transmission component, a moving contact, a static side component and a moving side component. The driving component drives the transmission component, and then drives the moving contact to move, so that the moving contact and the static side shield can be brought into contact and disengaged, thereby realizing the closing and opening functions of the movable earthing knife switch. The static side shield adopts a double-flow mode to realize the grounding function. The static side shell and the static side shield at the static side end of the knife switch are respectively set as open structures, so that the busbar contact mounting end of any component can be assembled and reused. By adopting the settings of the driving component and the transmission component, the test operator can perform remote operation, thereby reducing the time for entering and exiting the test area and working operations, and greatly improving the safety performance. The present invention has simple manufacturing and processing, simple structure, convenient installation and disassembly, and is suitable for factory mass production.

[0037] Preferably, the transmission assembly of the present invention is composed of a guide device, an axle pin, a transmission connecting plate, a rotating crank arm and a moving contact axle pin, which can convert the steering force of the drive assembly into linear motion of the moving contact within a limited range, thereby easily completing the closing and opening functions.

[0038] Preferably, the present invention provides a busbar terminal guide sleeve on the static side shielding, thereby facilitating the guiding and fixing of the wiring terminal of the test element during the test.

[0039] Further preferably, the present invention adopts a non-bolt fixing method at the static side end, but instead adopts an interference fit plug-in connection. This not only facilitates disassembly, but also facilitates the installation of the movable grounding switch at any busbar contact interface, and is highly movable and reusable.

[0040] Preferably, the busbar end guide sleeve of the present invention is made of polystyrene, so that the guide has high temperature resistance.

[0041] Preferably, the present invention connects the static side housing and the dynamic measurement housing to the insulating plate respectively and realizes electrical connection between the two through a grounding wire, which can improve the insulation performance.

[0042] Preferably, when the test element is installed on the knife switch, an independent air chamber is formed between the test element and the static side housing, replacing the intermediate transition air chamber of the test tooling, thereby improving work efficiency.

[0043] Preferably, the static side shield of the present invention has one end with a through hole designed as a spherical structure, and one end for mounting the test element designed as a cylindrical tube structure, which facilitates the installation and disassembly of the knife switch when performing insulation tests on the test element.

[0044] The present invention also provides a method for using a movable grounding knife switch, which can be applied to components with fractures and requiring insulation tests between fractures. The method improves the test efficiency while increasing the safety factor of test personnel, is simple and feasible, and is conducive to promotion. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 The electrical schematic diagram of the present invention;

[0046] Figure 2 A schematic diagram of a closing assembly structure of a movable earthing switch provided in an embodiment of the present invention;

[0047] Figure 3 A schematic diagram of a split-switch assembly structure of a movable earthing knife switch provided in an embodiment of the present invention;

[0048] Figure 4 A schematic diagram of a static side component of a movable grounding switch provided by an embodiment of the present invention;

[0049] Figure 5 A partially enlarged view of a transmission assembly of a movable grounding switch provided in an embodiment of the present invention.

[0050] Reference numerals:

[0051] Inner conductor of test element-1; outer shell of test element-2; air barrier of test element-3; static side shell-4; internal metal insert of air barrier of test element-5; busbar terminal-6; inner current guide contact-7; static side shield-8; outer current guide contact-9; moving contact-10; moving contact seat-11; insulating plate-12; transmission assembly-13; dynamic side shell-14; electric mechanism-15; grounding wire-16; dynamic side shield-17; control cable-18; busbar terminal guide sleeve-19; operating table-20; guide device-21; shaft pin-22; transmission connecting plate-23; rotating crank arm-24; moving contact shaft pin-25. DETAILED DESCRIPTION

[0052] The present invention provides a movable grounding knife switch, comprising a static side component, a dynamic side component and a driving component insulating plate 12;

[0053] The moving side assembly includes a moving side housing 14, on which a transmission assembly 13 and a moving contact 10 are mounted. The driving end of the transmission assembly 13 is fixedly connected to the driving assembly, and the driving end of the transmission assembly 13 is rotatably connected to the moving contact 10. A moving side shield 17 is sleeved on the moving contact 10.

[0054] The static side assembly includes a static side shell 4, and a static side shield 8 is arranged inside the static side shell 4; a hole is opened at one end of the static side shell 4, and one end of the dynamic side shield 17 is fixed in the hole of the static side shell 4; the other end of the static side shell 4 is an opening structure for installing test elements.

[0055] A busbar terminal guide sleeve 19 for fixing the wiring terminal of the test element is connected to the inner wall of the static side shield 8. The static side shield 8 and the busbar terminal guide sleeve 19 are connected by interference fit. The busbar terminal guide sleeve 19 is made of polystyrene.

[0056] One end of the static side shield 8 is an opening structure for installing a test element, and an inner current guide contact 7 is connected to the inner wall of the static side shield 8 near the opening for contacting the wiring terminal of the test element; a through hole is provided at the other end of the static side shield 8, and an outer current guide contact 9 is provided on the inner wall of the through hole; the moving contact 10 can move along its axial direction into the through hole of the static side shield 8, and can achieve electrical contact with the outer current guide contact 9.

[0057] The transmission assembly includes a guide device 21 , an axle pin 22 , a transmission connecting plate 23 , a rotating crank arm 24 and a moving contactor axle pin 25 ; the guide device 21 is fixed on the moving side housing 14 .

[0058] One end of the transmission link plate 23 is fixed to the guide device 21 through an axle pin 22, and the other end thereof is connected to the moving contact 10 through a moving contact axle pin 25. The midpoint of the transmission link plate 23 is connected to one end of the rotating crank arm 24; the other end of the rotating crank arm 24 is rotatably set on the moving side housing 14, and is hingedly connected to the transmission shaft of the drive assembly through an axle pin.

[0059] The moving-side shield 17 is fixed to the stationary-side housing 4 via a moving contact seat 11 , and the moving contact 10 is disposed on the moving contact seat 11 .

[0060] The driving assembly includes an electric mechanism 15 and an operating table 20 ; the electric mechanism 15 is connected to the driving end of the transmission assembly 13 via a transmission shaft; the electric mechanism 15 and the operating table 20 are connected via a control cable 18 .

[0061] The stationary side housing 4 and the moving side housing 14 are respectively connected to the insulating plate 12 , and the stationary side housing 4 and the moving side housing 14 are electrically connected via a grounding wire 16 .

[0062] After the test element is installed, an independent air chamber is formed between the test element and the stationary side housing 4 .

[0063] The end of the static side shield 8 with a through hole is a spherical structure, and the end thereof for mounting the test element is a cylindrical tube structure.

[0064] The present invention also provides a method for using a movable grounding switch, based on the above movable grounding switch, comprising the following steps:

[0065] Install the movable earthing knife switch on the test element, start the driving assembly to drive the transmission assembly 13 to rotate, and then drive the moving contact 10 to move upward, so that the moving contact 10 is completely moved to the inside of the moving side shield 17 and completely separated from the static side shield 8, completing the opening of the movable earthing knife switch, and performing an insulation test on the test element;

[0066] Restarting the driving assembly drives the transmission assembly 13 to rotate, and then drives the moving contact 10 to move downward, so that the moving contact 10 and the static side shield 8 are fully electrically contacted, completing the closing of the movable earthing knife switch, and performing the insulation test between the test element breaks.

[0067] Example

[0068] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0069] like Figure 2 and Figure 3As shown, this embodiment provides a movable grounding knife switch, including a static side shield 8, an external guide contact 9, a moving contact 10, a moving contact seat 11, an insulating plate 12, a transmission assembly 13, a moving side housing 14, an electric mechanism 15, a grounding wire 16, a moving side shield 17, a control cable 18, a busbar end guide sleeve 19, an operating table 20, a guide device 21, an axle pin 22, a transmission connecting plate 23, a rotating crank arm 24 and a moving contact axle pin 25.

[0070] The test element to be tested in this embodiment specifically includes: a test element inner conductor 1, a test element outer shell 2, a test element air barrier 3, a static side shell 4, a metal insert 5 inside the test element air barrier and a bus terminal 6 (connection terminal). The specific operation of connecting and fixing the test element to the above-mentioned movable grounding knife switch is:

[0071] The inner conductor 1 of the test component is fixedly installed on the metal insert 5 inside the test element air barrier by bolts, the metal ring on the outer edge of the test element air barrier 3 is connected and fixed to the test element shell 2 by bolts, and the static side shell 4 is fixed to the metal ring on the outer edge of the test element insulating air barrier 3 by bolts; the busbar terminal 6 of the test element is located on the busbar contact seat of the test element, and the busbar terminal 6 is fixed to the metal insert 5 inside the test element air barrier by bolts; the inner guide contact 7 is installed in the upper groove of the busbar terminal 6, and the lower part of the static side shield 8 is connected to the busbar terminal 6 The inner part of the busbar terminal 6 is electrically contacted through the inner guide contact 7, and is fixed to the busbar terminal 6 through the busbar terminal guide sleeve 19; the moving contact seat 11 is fixed to both the moving side housing 14 and the moving side housing 4, the moving side shield 17 is fixed to the moving contact seat 11 by bolts, and the moving contact 10 is arranged on the moving contact seat 11; the inner side of the moving contact seat 11 is connected to the moving contact 10 through the outer guide contact 9, and the outer bottom of the moving contact seat 11 fixes the moving side shield 17, thereby realizing the insulation performance of the movable grounding knife switch in the open state.

[0072] The moving side housing 14 is fixed to the insulating plate 12 by bolts; the insulating plate 12 is fixed to the stationary side housing 4 by bolts, and the stationary side housing 4 and the moving side housing 14 are electrically connected through the grounding wire 16; the transmission assembly 13 is fixed to the moving side housing 14 by the shaft pin 22, and the bottom of the moving contact 10 is fixed to the transmission assembly 13 by the moving contact shaft pin 25; the driving end of the transmission assembly 13 is engaged with the transmission shaft of the electric mechanism 15; one side of the control cable 18 is connected to the electric mechanism 15, and the other side thereof is connected to the operating table 20.

[0073] The transmission assembly 13 includes a guide device 21, an axle pin 22, a transmission connecting plate 23, a rotating crank arm 24 and a moving contact axle pin 25;

[0074] The guide device 21 is fixed to the movable side housing 14 by bolts. The guide device 21 fixes the transmission link plate 23 and the rotating crank arm 24 to the guide device 21 through the shaft pin 22.

[0075] The shaft pin 22 is used to connect the transmission link plate 23 and the rotating crank arm 24 , so that the shaft pin 22 can move along the direction of the guide device 21 .

[0076] The transmission connecting plate 23 is provided with three mounting holes, one end hole is connected to the guide device 21, and the other end hole is connected to the moving contact 10 through the moving contact shaft pin 25. A rotatable turning arm 24 is fixed to the middle hole of the transmission connecting plate 23.

[0077] One end of the rotating crank arm 24 is rotatably arranged on the moving side housing 14 through a rotating shaft and is connected to the transmission shaft of the electric mechanism 15; the other end of the rotating crank arm 24 is connected to the center of the transmission connecting plate 23; the rotating shaft and the movement axis of the moving contact 10 are located on the same plane.

[0078] When the movable earthing knife switch is in the closed state, the movable contact 10 of the movable earthing knife switch contacts the static side shield 8 through the external current conducting contact 9, so that the inner conductor 1 of the test element is connected with the movable contact 10 and the movable side housing 14;

[0079] When the movable earthing switch is in the open state, the movable side shield 17 and the static side shield 8 of the movable earthing switch can be subjected to insulation resistance test; the moving contact 10 of the movable earthing switch is moved by the transmission assembly 13, and the transmission assembly 13 is driven by the electric mechanism 15. The state of the electric mechanism 15 is operated by the operating console 20, and the command of the operating console 20 is transmitted to the electric mechanism 15 by the control cable.

[0080] like Figure 1 As shown, the electrical principle on which the present invention is based is: when the product (test element) is assembled, the movable grounding switch provided in this embodiment is installed on one side of the test element, and when the insulation test of the test element is performed; the test element can be first tested by closing the switch to the ground; at this time, the movable grounding switch is in the open state; the test element is in the closed state; then the insulation test between the breaks of the test element is performed, the test element is in the open state, and the movable grounding switch on one side of the test element where the movable grounding switch is installed is closed, and then a high-voltage transformer is connected to the other side of the test element to perform an insulation test between the breaks.

[0081] When the operating console 20 issues a closing command, the signal information is transmitted to the electric mechanism 15 through the control cable 18, the gear of the electric mechanism 15 drives the transmission component 13 to move, and the transmission component 13 drives the moving contact 10 to move through the shaft pin. When the moving contact 10 is fully electrically contacted with the static side shield 8 through the external current guide contact 9, the closing is completed. At this time, one side of the test element equipped with the movable grounding knife switch, that is, the inner conductor 1 of the test element is at the ground potential.

[0082] When the operating console 20 issues a trip command, the signal information is transmitted to the electric mechanism 15 through the control cable 18, and the gear of the electric mechanism 15 drives the transmission component 13 to move, and the transmission component 13 drives the moving contact 10 to move through the shaft pin. When the moving contact 10 is completely moved to the inside of the moving side shield 17, the trip is achieved. At this time, the inner conductor 1 of the test element is at a high potential, and the movable grounding knife switch is at a ground potential, so the insulation test of the product can be withstood between the moving side shield 17 and the static side shield 8.

[0083] In particular, the specific movement process of the transmission component 13 is as follows: Figure 5 As shown, after the electric mechanism 15 outputs power, the electric mechanism 15 transmits the force to one end of the rotating crank arm 24 through the gears and the transmission shaft. The other end of the rotating crank arm 24 connected to the transmission connecting plate 23 transmits the force to one end of the transmission connecting plate 23 connected to the guide device 21 and one end of the transmission connecting plate 23 connected to the moving contact 10 under the drive of the force, so that the end of the transmission connecting plate 23 connected to the guide device 21 can reciprocate left and right along the direction of the guide device 21, and the end connected to the moving contact 10 can reciprocate up and down along the axial direction, that is, the transmission crank arm 24 converts the rotational force of the electric mechanism 15 into a linear motion of the moving contact 10 through the transmission connecting plate 23 and the guide device 21, thereby completing the opening and closing process of a movable grounding knife switch provided in this embodiment.

[0084] When assembling the test prototype of the product component, the movable grounding knife switch is installed on the test interface and is an independent air chamber, which can save the intermediate transition air chamber of the test tooling.

[0085] When the test element is conducting a closing test to ground, the movable grounding switch is in the following state: Figure 3 As shown, it is in the open state at this time; and the insulation performance of the product can be withstood between the moving side shield 17 and the static side through-current shield 8;

[0086] When the test element is conducting the insulation test between the fractures, the test element is opened by remote operation, and the movable earthing knife switch is closed. Figure 2 As shown; through the moving contact 10, the outer current-conducting contact 9, the static side current-through shield 8, and the inner current-conducting contact 7, the inner conductor on one side of the component break is made ground potential.

[0087] like Figure 4 As shown, the top of the static side shield 8 is a spherical structure, and the lower part that contacts the busbar end is a cylindrical tube structure. This design facilitates the plug-in and unplugging installation of the test element; the inner wall size of the static side shield 8 is φB; the busbar end guide sleeve 19 is made of polystyrene, and its maximum outer diameter is φA, and φA and φB are required to be interference fit; the outer wall diameter of the lower cylindrical tube structure of the static side shield 8 is φD; the internal diameter size of the busbar end 6 is φC; φC is required to be greater than φD. The purpose of this is to ensure that the above-mentioned two components are connected by plug-in interference fit connections, further improving the stability of the connection between the test element and the grounding knife switch. In addition, by adopting the plug-in connection method with extreme size fit, the movable grounding knife switch can be installed at the busbar end of any component product, which greatly enhances the applicability of the grounding knife switch.

[0088] A movable grounding knife switch provided in this embodiment, through the coordinated cooperation of a driving component, a transmission component, a moving contact, a moving side shield and a static side shield, the driving component drives the transmission component, and then drives the moving contact to move, so as to realize the contact and disengagement of the moving contact and the static side shield, thereby realizing the closing and opening functions of the movable grounding knife switch, and adopts a double-flow mode through the static side shield to realize the grounding function. At the same time, by setting the static side shell and the static side shield at the static side end of the knife switch as open structures respectively, it can be assembled at the busbar contact mounting end of any element and can be reused. By adopting the setting of the driving component and the transmission component, it can be assembled at any busbar contact mounting end and can be reused. A remote operating table is set, and the test operator can perform remote operation to complete the insulation test of the test element (including the insulation test between the fractures of the test element), thereby reducing the time of entering and exiting the test area and working operations, and greatly improving the safety performance; the present invention is simple to manufacture and process, simple in structure, convenient to install and disassemble, and suitable for factory mass production.

[0089] Although the embodiments of the present invention are described above in conjunction with the accompanying drawings and embodiments, the present invention is not limited to the above-mentioned specific embodiments and application fields, and the above-mentioned specific embodiments are only illustrative and instructive, rather than restrictive. Under the guidance of the specification, those skilled in the art can also make many forms without departing from the scope of protection of the claims of the present invention, all of which belong to the scope of protection of the present invention.

Claims

1. A movable grounding switch, characterized in that: It includes a static side component, a dynamic side component and a driving component; The moving side assembly comprises a moving side housing (14), and a transmission assembly (13) and a moving contact (10) are mounted on the moving side housing (14); The driving end of the transmission assembly (13) is fixedly connected to the driving assembly, and the driving end of the transmission assembly (13) is rotationally connected to the moving contact (10); The moving contact (10) is sleeved with a moving side shield (17); The static side assembly comprises a static side shell (4), and a static side shield (8) is arranged inside the static side shell (4); A hole is formed at one end of the static side shell (4), and one end of the dynamic side shield (17) is fixed in the hole of the static side shell (4); The other end of the static side housing (4) is an opening structure for installing a test element; A busbar terminal guide sleeve (19) for fixing the test element connection terminal is connected to the inner wall of the static side shield (8); One end of the static side shield (8) is an opening structure for installing a test element, and an inner guide contact (7) for contacting a wiring terminal of the test element is connected to an inner wall of the static side shield (8) near the opening; A through hole is formed at the other end of the static side shield (8), and an external current guide contact (9) is provided on the inner wall of the through hole; The movable contact (10) can move along its axial direction into the through hole and can achieve electrical contact with the external current guide contact (9); The transmission assembly comprises a guide device (21), an axle pin (22), a transmission connecting plate (23), a rotating crank arm (24) and a moving contact axle pin (25); The guide device (21) is fixed on the movable side housing (14); One end of the transmission link plate (23) is fixed to the guide device (21) via an axle pin (22), and the other end is connected to the moving contact (10) via a moving contact axle pin (25); the midpoint of the transmission link plate (23) is connected to one end of the rotating crank arm (24); The other end of the rotating crank arm (24) is rotatably disposed on the movable side housing (14) and is hingedly connected to the transmission shaft of the driving assembly via an axle pin; The static side shield (8) and the busbar end guide sleeve (19) are connected by interference fit; The moving side shield (17) is fixed to the stationary side housing (4) via a moving contact seat (11), and the moving contact (10) is arranged on the moving contact seat (11).

2. A movable grounding switch according to claim 1, characterized in that: The busbar end guide sleeve (19) is made of polystyrene.

3. The movable grounding switch according to claim 1, characterized in that: The driving assembly comprises an electric mechanism (15) and an operating table (20); The electric mechanism (15) is connected to the driving end of the transmission assembly (13) via a transmission shaft; The electric mechanism (15) is connected to the operating table (20) via a control cable (18).

4. The movable grounding switch according to claim 1, characterized in that: comprising an insulating plate (12); The stationary side housing (4) and the moving side housing (14) are respectively connected to the insulating plate (12), and the stationary side housing (4) and the moving side housing (14) are electrically connected via a grounding wire (16).

5. The movable grounding switch according to claim 1, characterized in that: When the test element is installed, an independent air chamber is formed between the test element and the stationary side casing (4).

6. The movable grounding switch according to claim 1, characterized in that: One end of the static side shield (8) provided with a through hole is spherical, and the other end of the static side shield (8) used for mounting a test element is cylindrical.

7. A method for using a movable grounding knife switch, based on a movable grounding knife switch according to any one of claims 1 to 6, characterized in that: The following steps are involved: The movable earthing knife switch is mounted on the test element, and the driving assembly is started to drive the transmission assembly (13) to rotate, thereby driving the moving contact (10) to move upward, so that the moving contact (10) is completely moved to the inside of the moving side shield (17) and is completely separated from the static side shield (8), thereby completing the opening of the movable earthing knife switch and performing an insulation test on the test element; The drive assembly is started again to drive the transmission assembly (13) to rotate, thereby driving the moving contact (10) to move downward, so that the moving contact (10) and the static side shield (8) are fully electrically contacted, the movable earthing knife switch is closed, and an insulation test between the fractures of the test element is performed.

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