CN115312348A - A kind of movable grounding knife switch and using method thereof - Google Patents

Abstract

The invention discloses a movable grounding disconnecting link and a use method thereof, belonging to the technical field of gas-insulated metal-enclosed switchgear.A driving component, a transmission component, a moving contact, a moving side shield and a static side shield are cooperatively matched, the transmission component is driven by the driving component to further drive the moving contact to move, so that the moving contact can be contacted with and separated from the static side shield, the switching-on and switching-off functions of the movable grounding disconnecting link are further realized, the grounding function is realized by adopting a double-current mode through the static side shield, meanwhile, the assembly at any bus contact mounting end can be realized, the movable grounding disconnecting link can be repeatedly used, a test operator can carry out remote operation, the time for entering and exiting a test area and the time for working operation are further reduced, and the safety performance is greatly improved; the invention has simple manufacture and processing, simple structure and convenient assembly and disassembly, and is suitable for batch production in factories.

Description

A movable grounding knife switch and its application method

technical field

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

Background technique

Gas-insulated metal-enclosed switchgear (hereinafter referred to as GIS equipment) is composed of circuit breakers, isolating switches, earthing switches, transformers, lightning arresters, busbars, etc.

When the components of the GIS equipment are tested at the factory, for the components with fractures, if necessary, an insulation test between the fractures is required. It is necessary to set either side of the fractured components to the grounding state, due to the assembly site and transportation conditions. Especially for ultra-high voltage equipment, most of them are produced by component organization, including circuit breaker components, and each circuit breaker needs to carry out the insulation test between the breaks and the insulation test between the switch and the ground.

When conducting the close-to-ground and fracture insulation tests of the circuit breaker, it is necessary to set the circuit breaker to the closed state, connect one side of the transformer, and load the voltage for the test. After the test is completed, the circuit breaker needs to be manually opened, and the other One side is grounded, and if necessary, the busbar needs to be connected, and then the insulation test is carried out. This process consumes manpower, has many interfaces, and requires an intermediate transition air chamber. The test process is cumbersome. The performance is not high.

Contents of the invention

In order to solve the technical problem that the test process of the insulation test is cumbersome and the safety cannot be guaranteed, the invention provides a movable grounding knife switch and its use method, which can complete the insulation test of the test element through remote operation without the need for on-site operation by the test personnel .

In order to achieve the above object, the present invention adopts following technical scheme:

A movable grounding knife switch, including a static side assembly, a dynamic side assembly and a drive assembly;

The moving side assembly includes a moving side housing on which a transmission assembly and a moving contact are installed;

The drive end of the transmission assembly is fixedly connected to the drive assembly, and the transmission end of the transmission assembly is rotatably connected to the moving contact;

The moving contact is covered with a moving side shield;

The static-side assembly includes a static-side housing, and a static-side shield is arranged inside the static-side housing;

A hole is opened at one end of the static-side housing, and one end of the moving-side shield is fixed in the hole of the static-side housing;

The other end of the static side housing is an opening structure for installing test elements;

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

One end of the static-side shield is an opening structure for installing the test element, and the inner wall of the static-side shield close to the opening is connected with an inner guide contact for contacting the terminal of the test element;

The other end of the static side shield is provided with a through hole, and the inner wall of the through hole is provided with an outer guide contact;

The movable contact can move into the through hole along its axial direction, and can realize electrical contact with the outer current-guiding contact.

Further, the transmission assembly includes a guide device, a shaft pin, a transmission connecting plate, a rotating crank arm and a moving contact shaft pin;

The guide device is fixed on the moving side housing;

One end of the transmission connecting plate is fixed on the guide device through a shaft pin, and the other end is connected with the moving contact through a moving contact shaft pin. connected at one end;

The other end of the rotating crank arm is rotatably arranged on the moving side housing, and is hingedly connected with the transmission shaft of the driving assembly through a pivot pin.

Further, the shield on the static side is connected to the guide sleeve of the busbar end in an interference fit manner.

Further, the guide sleeve of the busbar end is made of polyphenylene.

Further, the moving side shield is fixed on the static side housing through a moving contact seat, and the moving contact is arranged on the moving contact seat.

Further, the drive assembly includes an electric mechanism and an operating table;

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

The electric mechanism is connected with the console through a control cable.

Further, an insulating board is included;

The static-side casing and the moving-side casing are respectively connected to the insulating plate, and the static-side casing and the moving-side casing are electrically connected through a ground wire.

Further, after the test element is installed, an independent air chamber is formed between the test element and the static-side casing.

Further, one end of the static-side shield provided with a through hole is spherical, and the other end of the static-side shield for installing the test element is cylindrical.

A method for using a movable grounding knife switch, based on the above-mentioned movable grounding knife switch, comprising the following steps:

Install the movable grounding 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 upwards, so that the moving contact is completely moved to the inside of the moving side shield and completely separated from the static side shield, complete The opening of the movable grounding knife switch, and the insulation test of the test components;

Start the driving 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 can completely realize electrical contact, complete the closing of the movable grounding knife switch, and conduct the insulation test between the fractures of the test components .

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

The invention provides a movable grounding knife switch, through the coordinated cooperation of the drive assembly, the transmission assembly, the moving contact, the static side assembly and the moving side assembly, the drive assembly drives the transmission assembly, and then drives the moving contact to move, which can realize The contact and disengagement between the moving contact and the shield on the static side realizes the closing and opening functions of the movable grounding knife switch, and adopts a double-flow mode through the shielding on the static side to realize the grounding function and at the same time through the The static side housing and the static side shield at the static side end are respectively set as open structures, which can be assembled on the busbar contact installation end of any component and can be reused. By using the setting of the driving component and the transmission component, the test operator can conduct remote terminal operation, thereby reducing the time for entering and exiting the test area and working operations, and greatly improving the safety performance; the invention has simple manufacturing process, simple structure, convenient installation and disassembly, and is suitable for mass production in factories.

Preferably, the transmission assembly of the present invention is composed of a guide device, a shaft pin, a transmission connecting plate, a rotating crank arm and a shaft pin of the moving contact, so that within a limited range, the steering force of the driving assembly can be converted into the force of the moving contact. Linear motion, so as to easily complete the closing and opening functions.

Preferably, in the present invention, a busbar terminal guide sleeve is arranged on the static-side shield, so as to guide and fix the terminal terminal of the test element during the test.

Further preferably, the present invention adopts a non-bolt fixing method at one end of the static side, but adopts an interference fit plug-in connection, which is not only convenient for disassembly, but also facilitates the installation of the movable grounding knife switch on any busbar The contact interface is removable and reusable.

Preferably, the guide sleeve of the busbar end of the present invention is made of polyphenylene, so that the guide has high temperature resistance.

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

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, which replaces the intermediate transition air chamber of the test tool, thereby improving work efficiency.

Preferably, the static side shield of the present invention is designed with a spherical structure at one end provided with a through hole, and designed with a cylindrical tubular structure at the end where the test element is installed, which facilitates the installation of the knife switch and the Disassemble.

The invention also provides a method for using the movable grounding knife switch, which can be applied to components with fractures and requiring insulation tests between fractures. While improving the test efficiency, the method also improves the safety factor of test personnel, is simple and feasible, and is beneficial to popularization.

Description of drawings

Fig. 1 is the electric schematic diagram that the present invention relates to;

Fig. 2 is a schematic diagram of a closing assembly structure of a movable grounding knife switch provided by an embodiment of the present invention;

Fig. 3 is a schematic diagram of the opening assembly structure of a movable grounding knife switch provided by an embodiment of the present invention;

Fig. 4 is a schematic diagram of a static side assembly of a movable grounding knife switch provided by an embodiment of the present invention;

Fig. 5 is a partially enlarged view of a transmission assembly of a movable grounding knife switch provided by an embodiment of the present invention.

Reference signs:

Test element inner guide-1; test element shell-2; test element air barrier-3; static side shell-4; test element air barrier internal metal insert-5; 7; Static side shield-8; Outer guide contact-9; Moving contact-10; Moving contact seat-11; Insulating plate-12; Transmission component-13; Moving side housing-14; ;Grounding wire-16; Moving side shielding-17; Control cable-18; 24; Moving contact shaft pin-25.

Detailed ways

The present invention provides a movable grounding knife switch, which includes a static side component, a moving side component and an insulating plate 12 of a driving component;

The moving side assembly includes a moving side housing 14 on which a transmission assembly 13 and a moving contact 10 are installed. The driving end of the transmission assembly 13 is fixedly connected to the driving assembly, and the transmission end of the transmission assembly 13 is connected to the moving contact 10 in a rotational manner. The moving side shield 17 is sheathed on the moving contact 10 .

The static-side assembly includes a static-side housing 4, and a static-side shield 8 is arranged inside the static-side housing 4; a hole is opened at one end of the static-side housing 4, and one end of the moving-side shield 17 is fixed on the In the hole of the static-side housing 4; the other end of the static-side housing 4 is an opening structure for installing test elements.

The inner wall of the static side shield 8 is connected with a busbar terminal guide sleeve 19 for fixing the terminal of the test element. The static side shield 8 and the busbar terminal guide sleeve 19 are connected by an interference fit. The end guide sleeve 19 is made of polyphenylene.

One end of the static side shield 8 is an opening structure for installing the test element, and the inner wall of the static side shield 8 close to the opening is connected with an inner current guide contact 7 for contacting with the test element terminal; The other end of the static side shield 8 is provided with a through hole, and the inner wall of the through hole is provided with an outer guide contact 9; the movable contact 10 can move along its axial direction to the through hole of the static side shield 8 In the hole, and can achieve electrical contact with the outer current guide contact 9.

The transmission assembly includes a guide device 21 , a shaft pin 22 , a transmission connecting plate 23 , a rotary crank arm 24 and a movable contact shaft pin 25 ; the guide device 21 is fixed on the movable side housing 14 .

One end of the transmission connecting plate 23 is fixed on the guide device 21 through a shaft pin 22, and the other end is connected with the moving contact 10 through a moving contact shaft pin 25, and the midpoint of the transmission connecting plate 23 is It is connected with one end of the rotating arm 24; the other end of the rotating arm 24 is rotatably arranged on the moving side housing 14, and is hingedly connected with the transmission shaft of the driving assembly through a pivot pin.

The moving side shield 17 is fixed on the static side housing 4 through the moving contact seat 11 , and the moving contact 10 is arranged on the moving contact seat 11 .

The drive assembly includes an electric mechanism 15 and an operating console 20 ; the electric mechanism 15 is connected to the driving end of the transmission assembly 13 through a transmission shaft; the electric mechanism 15 is connected to the operating console 20 through a control cable 18 .

The static-side casing 4 and the moving-side casing 14 are respectively connected to the insulating plate 12 first, and the static-side casing 4 and the moving-side casing 14 are electrically connected through a ground wire 16 .

After the test element is installed, an independent air chamber is formed between the test element and the static side casing 4 .

One end of the static side shield 8 provided with a through hole is a spherical structure, and the end for installing the test element is a cylindrical tubular structure.

The present invention also provides a method for using a movable grounding knife switch, based on the above-mentioned movable grounding knife switch, comprising the following steps:

Install the movable grounding 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 upwards, so that the moving contact 10 completely moves to the inside of the moving side shield 17 and is connected to the static side shielding 8 Completely disengage, complete the opening of the movable grounding knife switch, and conduct insulation tests on the test components;

Start the driving assembly again to drive the transmission assembly 13 to rotate, and then drive the moving contact 10 to move downward, so that the moving contact 10 and the static side shield 8 can completely realize electrical contact, complete the closing of the movable grounding knife switch, and test the fracture of the component Insulation test between.

Example

The present invention will be further described below in conjunction with drawings and embodiments.

As shown in Figure 2 and Figure 3, this embodiment provides a movable grounding knife switch, including a static side shield 8, an outer current guide contact 9, a moving contact 10, a moving contact seat 11, an insulating plate 12, Transmission assembly 13, moving side housing 14, motor mechanism 15, ground wire 16, moving side shield 17, control cable 18, busbar end guide sleeve 19, console 20, guide device 21, shaft pin 22, transmission connecting plate 23 , Rotate the crank arm 24 and the pivot pin 25 of the moving contact.

The test elements to be tested in this embodiment specifically include: test element inner guide 1, test element shell 2, test element air barrier 3, static side housing 4, test element air barrier internal metal insert 5 and busbar terminal 6 (wiring end). The specific operation of connecting and fixing the test element with the above-mentioned movable grounding knife switch is as follows:

Install the inner guide 1 of the test component on the metal insert 5 inside the air compartment of the test component through bolts, the metal ring on the outer edge of the gas compartment 3 of the test component is connected and fixed with the shell 2 of the test component through bolts, and the static side shell 4 passes through The bolts are fixed on the metal ring on the outer edge of the insulating air barrier 3 of the test element; the bus bar terminal 6 of the test element is located on the bus contact seat of the test element, and the bus bar end 6 is fixed on the metal insert 5 inside the air barrier of the test element by bolts Above; the inner diversion contact 7 is installed in the upper groove of the busbar terminal 6, the lower part of the static side shield 8 is in contact with the busbar terminal 6, the inside of the busbar terminal 6 is in electrical contact through the inner diversion contact 7, and the The guide sleeve 19 is fixed on the busbar terminal 6; the moving contact seat 11 is fixed on both the moving side casing 14 and the moving side casing 4, and the moving side shield 17 is fixed on the moving contact seat by bolts 11, the moving contact 10 is set on the moving contact seat 11; the inner side of the moving contact seat 11 is connected with the moving contact 10 through the outer guide contact 9, and the outer bottom of the moving contact seat 11 fixes the moving side Shielding 17, so as to realize the insulation performance of the movable grounding knife switch in the opening state.

The moving side casing 14 is fixed on the insulating plate 12 by bolts; the insulating plate 12 is fixed on the static side casing 4 by bolts, and the static side casing 4 and the moving side casing 14 are electrically connected through the ground wire 16; the transmission assembly 13 The bottom of the moving contact 10 is fixed on the transmission assembly 13 through 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; the control cable 18 One side is connected to the motor mechanism 15 , and the other side is connected to the console 20 .

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

The guide device 21 is fixed on the moving side casing 14 by bolts. The guide device 21 fixes the transmission connecting plate 23 and the rotating crank arm 24 on the guide device 21 through the pivot pin 22 .

The shaft pin 22 is used to connect the transmission connecting plate 23 and the turning crank arm 24 to realize the movement of the shaft pin 22 along the direction of the guide device 21 .

The transmission connecting plate 23 is provided with three installation holes, one end hole is connected to the guide device 21, the other end hole is connected to the moving contact 10 through the moving contact shaft pin 25, and the middle hole of the transmission connecting plate 23 is fixed with a rotatable Turn the crank arm 24.

One end of the rotating arm 24 is arranged on the moving side housing 14 through the rotating shaft, and is connected with the transmission shaft of the electric mechanism 15; the other end of the rotating arm 24 is connected to the center of the transmission connecting plate 23; the rotating shaft and the moving The axes of movement of the contacts 10 lie on the same plane.

When the movable grounding knife switch is in the closed state, the movable contact 10 of the movable grounding knife switch contacts the static side shield 8 through the outer guide contact 9, so that the inner guide 1 of the test element and the moving contact 10 and The moving side casing 14 is connected;

When the movable grounding knife switch is in the opening state, the withstand insulation test can be realized between the moving side shield 17 and the static side shielding 8 of the movable grounding knife switch; the moving contact 10 of the movable grounding knife switch passes through the transmission The assembly 13 realizes the movement of the movable contact 10 , the transmission assembly 13 is driven by the electric mechanism 15 , the state of the electric mechanism 15 is operated through the console 20 , and the command of the console 20 is transmitted to the electric mechanism 15 by the control cable.

As shown in Figure 1, the electrical principle that the present invention is based on is: when the product (test element) is assembled, the movable grounding knife switch provided by this embodiment is installed on one side of the test element, and the insulation of the test element is carried out. During the test, the closing test of the test element can be carried out first; at this time, the movable grounding knife switch is in the opening state; the test element is in the closing state; and then the insulation test between the fractures of the test element is carried out. In the gate state, the test element is installed with a movable grounding knife switch on one side of the movable grounding knife switch for closing operation, and then the other side of the test element is connected to a high-voltage transformer for insulation test between fractures.

When the console 20 issues a closing command, the signal information is transmitted to the motor mechanism 15 through the control cable 18, and the gear of the motor mechanism 15 drives the transmission assembly 13 to move, and the transmission assembly 13 drives the moving contact 10 to move through the shaft pin. When the contact 10 fully realizes electrical contact with the shield 8 on the static side through the outer current-conducting contact 9 , closing is completed. At this time, the test element is equipped with one side of the movable grounding knife switch, that is, the inner conductor 1 of the test element is the ground potential.

When the console 20 issues the opening command; the signal information is transmitted to the motor mechanism 15 through the control cable 18, the gear of the motor mechanism 15 drives the transmission assembly 13 to move, and the transmission assembly 13 drives the moving contact 10 to move through the shaft pin. When the head 10 is fully moved to the inside of the moving-side shield 17, the switch is opened. At this time, the inner conductor 1 of the test element is at high potential, and the movable grounding knife switch is at ground potential, so the gap between the moving side shield 17 and the static side shield 8 can withstand the insulation test of the product.

In particular, the specific movement process of the transmission assembly 13 is as follows: as shown in Figure 5, 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 gear and the transmission shaft, and the rotating crank arm 24 is connected Driven by force, the other end on 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, so that the transmission connecting plate 23 is connected to the guide One end of the device 21 can reciprocate left and right along the direction of the guide device 21, and one end connected to the movable contact 10 can reciprocate up and down in the axial direction, that is, the transmission crank arm 24 drives the electric mechanism through the transmission connecting plate 23 and the guide device 21. The rotational force of 15 is transformed into the linear motion of the movable contact 10, and then the opening and closing process of a movable grounding knife switch provided in this embodiment is completed.

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

When the test element is closed and grounded, the state of the movable grounding knife switch is shown in Figure 3, and it is in the open state at this time; and the insulation between the moving side shield 17 and the static side current shielding 8 can withstand the insulation of the product performance;

When the test element is performing the insulation test between fractures, the test element is opened at the remote end, and the movable grounding knife switch is closed, and the state is shown in Figure 2; , and static side flow shielding 8, and inner diversion contact 7 realize that the inner guide on one side of the component fracture is ground potential.

As shown in Figure 4, the top of the shield 8 on the static side has a spherical structure, and the lower part in contact with the busbar end is a cylindrical tubular structure, which is designed to facilitate the plug-in and installation of test components; the inner wall size of the shield 8 on the static side is φB; the busbar end The guide sleeve 19 is made of polyphenylene, and its maximum outer diameter is φA, which requires an interference fit between φA and φB; the diameter of the outer wall of the cylindrical tubular structure at the lower part of the static side shield 8 is φD; the internal diameter of the busbar terminal 6 is φC; the requirement is φC greater than φD, the purpose of doing this is to ensure that the above-mentioned two parts are connected by a plug-in interference fit connection, and further improve the stability of the connection between the test element and the grounding knife switch. The movable grounding knife switch can be installed at the end of the bus bar of any component product, so that the applicability of the grounding knife switch is greatly enhanced.

The movable grounding knife switch provided in this embodiment can drive the transmission assembly through the driving assembly, and then drive the moving contact to move through the cooperation of the driving assembly, the transmission assembly, the moving contact, the moving side shield and the static side shielding. Realize the contact and disengagement between the moving contact and the shield on the static side, and then realize the closing and opening functions of the movable grounding knife switch. The static side shell and the static side shield of the static side end are respectively set as open structures, which can be assembled on the installation end of the busbar contact of any component and can be reused. The installation end of the contact is assembled and reusable, and the remote operation table is set up. 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 number of people entering and leaving the test area and The working time greatly improves the safety performance; the invention has the advantages of simple manufacturing and processing, simple structure, convenient installation and disassembly, and is suitable for mass production in factories.

Although the embodiments of the present invention have been described above in conjunction with the accompanying drawings and examples, 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 enlightenment of the description, those skilled in the art can also make many forms without departing from the protection scope of the claims of the present invention, and these all belong to the protection of the present invention.

Claims (10)

1. A movable grounding knife switch is characterized in that it includes a static side assembly, a moving side assembly and a drive assembly; The moving-side assembly includes a moving-side casing (14), on which a transmission assembly (13) and a moving contact (10) are installed; The drive end of the transmission assembly (13) is fixedly connected to the drive assembly, and the transmission end of the transmission assembly (13) is rotationally connected to the moving contact (10); A moving side shield (17) is sheathed on the moving contact (10); The static-side assembly includes a static-side housing (4), and a static-side shield (8) is arranged inside the static-side housing (4); One end of the static side housing (4) is provided with a hole, and one end of the moving side shield (17) is fixed in the hole of the static side housing (4); The other end of the static side housing (4) is an opening structure for installing test elements; The inner wall of the static side shielding (8) is connected with a busbar terminal guide sleeve (19) for fixing the terminal of the test element; One end of the static side shielding (8) is an opening structure for installing test elements, and the inner wall of the static side shielding (8) near the opening is connected with an inner guide contact for contacting with the test element wiring terminals. head(7); The other end of the static side shield (8) is provided with a through hole, and the inner wall of the through hole is provided with an outer guide contact (9); The moving contact (10) can move into the through hole along its axial direction, and can realize electrical contact with the outer current guiding contact (9). 2. A movable grounding knife switch according to claim 1, characterized in that, the transmission assembly includes a guiding device (21), a pivot pin (22), a transmission connecting plate (23), a rotating crank arm ( 24) and moving contact shaft pin (25); The guide device (21) is fixed on the moving side casing (14); One end of the transmission connecting plate (23) is fixed on the guide device (21) through a shaft pin (22), and the other end is connected with the moving contact (10) through a moving contact shaft pin (25), The midpoint of the transmission connecting plate (23) is connected with one end of the rotating crank arm (24); The other end of the rotating crank arm (24) is rotatably arranged on the moving side casing (14), and is hingedly connected with the transmission shaft of the driving assembly through a pivot pin. 3. A movable grounding knife switch according to claim 1, characterized in that the static side shield (8) is connected to the busbar end guide sleeve (19) in an interference fit manner. 4. A movable grounding knife switch according to claim 1, characterized in that the guide sleeve (19) at the end of the busbar is made of polyphenylene. 5. A movable grounding knife switch according to claim 1, characterized in that, the moving side shield (17) is fixed on the static side housing (4) through the moving contact seat (11) , the moving contact (10) is arranged on the moving contact seat (11). 6. A movable grounding knife switch according to claim 1, characterized in that, the drive 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) through a transmission shaft; The electric mechanism (15) is connected with the console (20) through a control cable (18). 7. A movable grounding knife switch according to claim 1, characterized in that it comprises an insulating plate (12); The static-side casing (4) and the moving-side casing (14) are respectively connected to the insulating plate (12), and the connection between the static-side casing (4) and the moving-side casing (14) The electrical connection is realized through the ground wire (16). 8. A movable grounding knife switch according to claim 1, characterized in that, after the test element is installed, an independent air chamber is formed between the test element and the static side housing (4). 9. A movable grounding knife 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 static side shield (8) is used for installation The other end of the test element is a cylindrical tube. 10. A method for using a movable grounding knife switch, based on a movable grounding knife switch according to any one of claims 1-9, characterized in that it comprises the following steps: Install the movable grounding 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) completely moves to the moving side shield (17 ) and is completely separated from the static side shield (8), the opening of the movable grounding knife switch is completed, and the insulation test is carried out on the test components; Start the driving assembly again to drive the transmission assembly (13) to rotate, and then drive the moving contact (10) to move downward, so that the moving contact (10) and the static side shield (8) completely realize electrical contact, and complete the movable grounding knife switch The closing of the switch, conduct the insulation test between the fractures of the test components.

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