GIS isolation insulation torsion bar withstand voltage, partial discharge and lightning impulse test tool

Abstract

The GIS isolation insulation torsion bar withstand voltage, partial discharge and lightning impulse test tool comprises a vertical shell and a transverse shell communicated with the left side of the vertical shell, and a withstand voltage device, a first basin-type insulator, a first grounding switch, a first isolation switch and a second basin-type insulator which are sequentially connected through a conducting rod are installed in the transverse shell; an isolation insulation torsion bar to be detected is installed at the top end of the vertical conducting rod, a detachable isolation insulation torsion bar housing cover is installed at the top end of the vertical shell, an installation disc is fixed to the inner side of the isolation insulation torsion bar housing cover through screws, and a plurality of isolation insulation torsion bars are fixed to the installation disc through screws. The lower end of the isolation insulation torsion bar is fixed on the other installation disc through a screw, a conductive supporting rod is fixed below the other installation disc, and the lower end of the conductive supporting rod is inserted into a hole in the upper end of the vertical conductive rod. The beneficial effect is that the isolation insulation torsion bar is convenient to install during a test. The partial discharge test can avoid the influence of the external environment on the accuracy of the test data.

Description

Technical Field

[0001] This patent relates to the field of power equipment testing technology, specifically a GIS insulating torsion bar withstand voltage, partial discharge and lightning impulse test fixture, used for withstand voltage, partial discharge and lightning impulse tests of insulating torsion bars and similar insulating torsion bars. Background Technology

[0002] As a core component, the insulating torsion bar in GIS equipment requires rigorous insulation performance testing before leaving the factory, including power frequency withstand voltage, partial discharge (PD), and lightning impulse tests. Currently, the withstand voltage and PD tests for GIS insulating torsion bars are performed using SF6 / air bushings, and the PD test is affected by the external environment. This inaccuracy of PD test data cannot be guaranteed, which is detrimental to the long-term operation and reliability of GIS switchgear. Summary of the Invention

[0003] To overcome the shortcomings of the prior art, this utility model provides a GIS isolation and insulation torsion bar withstand voltage, partial discharge and lightning impulse test fixture that is simple in structure, reliable in safety performance and improves test efficiency.

[0004] The technical solution of this utility model is as follows:

[0005] A GIS isolation and insulation torsion bar withstand voltage, partial discharge and lightning impulse test fixture is characterized in that: it includes a vertical shell and a horizontal shell connected to its left side, and the horizontal shell is equipped with a withstand voltage device, a first basin insulator, a first grounding switch, a first disconnecting switch and a second basin insulator connected in sequence by conductive rods;

[0006] A vertical conductive rod is installed inside the vertical housing. The first disconnecting switch is connected to the vertical conductive rod through the horizontal conductive rod. The isolation and insulation torsion rod to be tested is installed at the top of the vertical conductive rod. A detachable isolation and insulation torsion rod cover is installed at the top of the vertical housing to enclose the isolation and insulation torsion rod inside the vertical housing and facilitate opening and replacement of the isolation and insulation torsion rod.

[0007] An insulating torsion bar cover is fixed to a mounting plate by screw one inside. Multiple insulating torsion bars are fixed to the mounting plate by screw two. The lower end of the insulating torsion bar is fixed to another mounting plate by screw two. A conductive support rod is fixed to the bottom of the other mounting plate. The lower end of the conductive support rod is inserted into the hole at the upper end of the vertical conductive rod.

[0008] In a further preferred embodiment, a rubber guide sleeve and a spring contact finger are installed in the annular groove inside the hole at the upper end of the vertical conductive rod. The rubber guide sleeve and the spring contact finger are in contact with the lower part of the conductive support rod. The rubber guide sleeve serves to guide and support, while the spring contact finger is used to support and bear the conductive connection.

[0009] In a further preferred embodiment, the vertical housing is also connected to a right-side horizontal housing. Inside the right-side horizontal housing are installed a third basin-type insulator, a second disconnecting switch, a second grounding switch, and a fourth basin-type insulator, which are connected in sequence via conductive rods. The second disconnecting switch is connected to a vertical conductive rod via a horizontal conductive rod. The second grounding switch is connected to a fifth basin-type insulator via a connecting busbar. The right end of the connecting busbar is connected to a conductive rod inside the bushing. The conductive rod inside the bushing is connected to the lightning impulse test equipment via steel-cored aluminum stranded wire.

[0010] A further preferred embodiment has a lifting lug fixed to the upper surface of the insulating torsion bar cover for hoisting, installing, and disassembling the insulating torsion bar cover and the insulating torsion bar.

[0011] A further preferred embodiment has an inflation valve and a density relay installed on the right-side transverse housing.

[0012] In a further preferred embodiment, a support leg is installed on the lower part of the longitudinal housing, and a support leg is installed on the right side of the transverse housing below the sleeve.

[0013] The advantages of this invention are its compact structure and convenient installation of the insulating torsion bar during testing. Pressure can be applied from the withstand voltage equipment to perform withstand voltage and partial discharge tests on the insulating torsion bar; pressure can be applied from the bushing side to perform lightning impulse tests. Partial discharge testing avoids the influence of the external environment on the accuracy of the test data, ensuring that the partial discharge test effectively evaluates the insulation performance of the insulating torsion bar, preventing potential faults, and thus ensuring the safe operation of GIS equipment in the power system. This testing fixture is used in withstand voltage, partial discharge, and lightning impulse tests on insulating torsion bars and similar insulating torsion bars. Attached Figure Description

[0014] The attached figure is a structural schematic diagram of this utility model. Figure 1 This is a diagram of the overall structure. Figure 2 for Figure 1 A magnified view of a portion of the image. Figure 3 for Figure 2 A magnified view of a portion of the image. Figure 4 for Figure 3 A magnified view of a portion of the image.

[0015] In the diagram, 1. Withstand voltage equipment; 2. Grounding switch; 3. Disconnecting switch; 4. Basin insulator; 5. Insulating torsion bar cover; 6. Insulating torsion bar; 7. Conductive rod; 8. Gas valve; 9. Density relay; 10. Bushing; 11. Lightning impulse device; 12. Support leg; 13. Support leg; 14. Mounting plate; 15. Two screws; 16. Conductive support rod; 17. Vertical housing; 18. Horizontal housing; 19. Lifting lug; 20. One screw; 21. Connecting busbar; 22. Rubber guide sleeve; 23. Spring contact finger. Detailed Implementation

[0016] The attached figure shows one embodiment of this utility model.

[0017] The GIS isolation and insulation torsion bar withstand voltage, partial discharge and lightning impulse test fixture of this utility model includes a vertical shell 17 and a horizontal shell 18 connected to its left side. The horizontal shell is equipped with a withstand voltage device 1, a first basin insulator 4, a first grounding switch 2, a first disconnecting switch 3 and a second basin insulator 4 connected in sequence by a conductive rod 7.

[0018] A vertical conductive rod 7 is installed inside the vertical housing. The first disconnect switch 3 is connected to the vertical conductive rod 7 through the horizontal conductive rod 7. The isolation and insulation torsion rod 6 to be tested is installed at the top of the vertical conductive rod. A detachable isolation and insulation torsion rod cover 5 is installed at the top of the vertical housing to enclose the isolation and insulation torsion rod 6 inside the vertical housing and facilitate the opening and replacement of the isolation and insulation torsion rod 6.

[0019] An insulating torsion bar cover 5 is fixed to a mounting plate 14 by screw 20 on the inside. Multiple insulating torsion bars 6 are fixed to the mounting plate by screw 15. The lower end of the insulating torsion bar is fixed to another mounting plate 14 by screw 15. A conductive support rod 16 is fixed to the bottom of the other mounting plate. The lower end of the conductive support rod is inserted into the hole at the upper end of the vertical conductive rod 7.

[0020] A rubber guide sleeve 22 and a spring contact finger 23 are installed in the annular groove inside the hole at the upper end of the vertical conductive rod 7. The rubber guide sleeve and the spring contact finger are in contact with the lower part of the conductive support rod 16. The rubber guide sleeve 22 serves to guide and support. The spring contact finger 23 is used to support and bear the conductive connection.

[0021] The vertical housing is also connected to a right-side horizontal housing. Inside the right-side horizontal housing are installed a third basin-type insulator 4, a second disconnecting switch 3, a second grounding switch 2, and a fourth basin-type insulator 4, which are connected in sequence via conductive rods 7. The second disconnecting switch 3 is connected to the vertical conductive rod 7 via the horizontal conductive rod 7. The second grounding switch 2 is connected to the fifth basin-type insulator 4 via a connecting busbar 21. The right end of the connecting busbar 21 is connected to the conductive rod inside the bushing 10. The conductive rod inside the bushing is connected to the lightning impulse test equipment 11 via steel-cored aluminum stranded wire.

[0022] The upper surface of the insulating torsion bar cover 5 is fixed with a lifting lug 19, which is used for hoisting, installing and disassembling the insulating torsion bar cover 5 and the insulating torsion bar 6, and can also be connected to a conductive device.

[0023] An inflation valve 8 and a density relay 9 are installed on the right-side horizontal housing.

[0024] The longitudinal housing is fitted with a support leg 12 at the bottom, and the transverse housing on the right side is fitted with a support leg 13 below the sleeve.

[0025] Inside the vertical housing, there are 5 isolation and insulation torsion bar covers, and the upper and lower mounting plates 14 can also conduct electricity.

[0026] GIS withstand voltage testing equipment is a high-voltage testing device used to test the insulation performance of gas-insulated switchgear. Its core function is to test the insulation capability of GIS equipment under operating voltage by applying high voltage, ensuring that the equipment will not experience breakdown, flashover, or other faults due to insulation defects during long-term operation. A 540kV AC withstand voltage test device can be used.

[0027] The test fixture mainly consists of a withstand voltage device 1, a lightning impulse device 11, a grounding switch 2, a disconnecting switch 3, an insulating torsion bar cover 5, a sealed housing, conductive components (connecting busbar 21), a basin-type insulator 4, an air-filling valve 8, a density relay 9, and a bushing 10.

[0028] This testing fixture, belonging to the category of GIS (Gas Insulation System) torsion bar testing fixtures, integrates withstand voltage testing, partial discharge detection, and lightning impulse testing functions. Its optimized structural design and operating procedures significantly improve testing efficiency and reliability. For withstand voltage and partial discharge tests, the withstand voltage equipment is directly connected to this fixture to pressurize the insulated torsion bar, avoiding the influence of the external environment on the partial discharge test and ensuring the accuracy of the partial discharge test data, thereby guaranteeing the safe operation of the GIS equipment. The lightning impulse test is conducted on the insulated torsion bar through bushing pressurization.

[0029] This GIS-based insulating torsion bar withstand voltage, partial discharge, and lightning impulse testing fixture, during withstand voltage and partial discharge tests, features an open bushing-side disconnector and grounding switch, while the open bushing-side disconnector and grounding switch are closed. Pressure is applied through the withstand voltage equipment to conduct the withstand voltage and partial discharge tests on the insulating torsion bar. During lightning impulse tests, the open bushing-side disconnector and grounding switch are open, while the bushing-side disconnector and grounding switch are closed. The bushing is connected to the lightning impulse testing equipment via steel-cored aluminum stranded wire, and the insulating torsion bar is subjected to the lightning impulse test. The optimized structural design and operating procedures significantly improve testing efficiency and safety reliability.

Claims

1. A fixture for testing the withstand voltage, partial discharge, and lightning impulse of a GIS insulating torsion bar, characterized in that: It includes a vertical housing (17) and a horizontal housing (18) connected to its left side. The horizontal housing is equipped with a withstand voltage device (1), a first basin insulator (4), a first grounding switch (2), a first disconnecting switch (3), and a second basin insulator (4) connected in sequence by a conductive rod (7). A vertical conductive rod (7) is installed inside the vertical housing. The first disconnecting switch (3) is connected to the vertical conductive rod (7) through the horizontal conductive rod (7). The top of the vertical conductive rod is equipped with the isolation and insulation torsion rod (6) to be tested. The top of the vertical housing is equipped with a detachable isolation and insulation torsion rod cover (5) to enclose the isolation and insulation torsion rod (6) inside the vertical housing and to facilitate opening and replacement of the isolation and insulation torsion rod (6). An insulating torsion bar cover (5) is fixed to a mounting plate (14) by screw one (20) on the inside. Multiple insulating torsion bars (6) are fixed to the mounting plate by screw two (15). The lower end of the insulating torsion bar is fixed to another mounting plate (14) by screw two (15). A conductive support rod (16) is fixed to the bottom of the other mounting plate. The lower end of the conductive support rod is inserted into the hole at the upper end of the vertical conductive rod (7).

2. The GIS isolation insulation torsion bar withstand voltage, partial discharge, and lightning impulse test fixture according to claim 1, characterized in that: A rubber guide sleeve (22) and a spring contact finger (23) are installed in the annular groove of the hole at the upper end of the vertical conductive rod (7). The rubber guide sleeve and the spring contact finger are in contact with the lower part of the conductive support rod (16). The rubber guide sleeve (22) serves as a guide and support. The spring contact finger (23) is used to support and bear the conductive connection.

3. The GIS isolation insulation torsion bar withstand voltage, partial discharge, and lightning impulse test fixture according to claim 1, characterized in that: The vertical shell is also connected to a right horizontal shell. The right horizontal shell is equipped with a third basin insulator (4), a second disconnecting switch (3), a second grounding switch (2) and a fourth basin insulator (4) connected in sequence by a conductive rod (7). The second disconnecting switch (3) is connected to the vertical conductive rod (7) through the horizontal conductive rod (7). The second grounding switch (2) is connected to the fifth basin insulator (4) through the connecting busbar (21). The right end of the connecting busbar (21) is connected to the conductive rod in the bushing (10). The conductive rod in the bushing is connected to the lightning impulse test equipment (11) through steel-cored aluminum stranded wire.

4. The GIS isolation insulation torsion bar withstand voltage, partial discharge, and lightning impulse test fixture according to claim 1, characterized in that: The upper surface of the insulating torsion bar cover (5) is fixed with a lifting lug (19) for hoisting, installing and disassembling the insulating torsion bar cover (5) and the insulating torsion bar (6).

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