GIS AC voltage withstand test tool

Abstract

The utility model relates to a GIS alternating current voltage withstand test tool. The GIS alternating current voltage withstand test tool comprises a corner assembly, a transverse extension assembly and a sleeve assembly. The device is provided with the sleeve assembly used for being electrically connected with a test high-voltage lead, the corner assembly and the transverse extension assembly, a shielding cover, an adapter conductor, a first extension conductor, a conducting rod and a wiring terminal board of the GIS can be electrically connected in sequence through the corner assembly and the transverse extension assembly, and the sleeve assembly can be arranged outside an offshore booster station. A test voltage applying position is changed from the inside of the offshore booster station to the outside of the offshore booster station, so that test equipment and a high-voltage lead can be arranged in a spacious place outside the offshore booster station, and the insulation distance of each high-voltage part in a test loop is greatly increased; and the GIS withstand voltage test of 500kV and Shanghai booster stations can be conveniently carried out at a 220kV offshore booster station.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment withstand voltage testing, and in particular to a GIS AC withstand voltage testing tool. Background Art

[0002] Gas-insulated switchgear (GIS) boasts a compact structure, small footprint, reliable operation, and immunity to pollution, wind, rain, and salt spray. It is widely used in various AC step-up substations and has become a crucial component of these systems. This article specifically describes an offshore AC step-up substation as an example. Offshore AC step-up substations (hereinafter referred to as offshore substations) serve as power transmission hubs for offshore wind farms, performing a crucial role in voltage conversion and energy transmission. To verify the insulation performance of the GIS after installation, it undergoes an AC withstand voltage test at the onshore manufacturing facility. Only after passing the test can the offshore substation be transported to the offshore wind farm.

[0003] At present, the voltage levels of offshore substations are mostly 110kV and 220kV. As domestic offshore wind power develops to deeper waters, the voltage levels of offshore substations are also constantly increasing, and offshore substations with voltages of 500kV or even higher have emerged. For 500kV offshore substations, the GIS voltage level is correspondingly increased, and the on-site AC withstand voltage test voltage is as high as 592kV, that is, the withstand voltage test voltage is high; the test safety distance is required to be more than 5 meters, that is, the test site and the test safety distance requirements are large. However, if the 220kV GIS AC withstand voltage test method in the relevant technology is used to conduct an AC withstand voltage test on the 500kV offshore substation GIS, the following problems exist:

[0004] First, the test bushing's insulation distance is too short to meet test requirements. The 500kV GIS withstand voltage test requires a safe insulation distance of at least 5 meters. 500kV GIS withstand voltage test bushings are typically over 6 meters long. If the test bushing is directly connected to the GIS's reserved test interface and placed inside the GIS equipment room, the minimum distance between the exposed high-voltage portion of the test bushing and the surrounding grounding conductors is only 3 meters, which does not meet test requirements.

[0005] On the other hand, the insulation distance of the test high-voltage lead is too small to meet test requirements. The 500kV offshore substation is compact and space-constrained. If the test high-voltage lead is placed directly inside the offshore substation, the insulation distance between the high-voltage lead and the surrounding grounding body will be less than 5 meters, which does not meet test requirements.

[0006] Furthermore, the cramped space within offshore substations makes it difficult to arrange test equipment. The 500kV GIS withstand voltage test equipment is large and numerous, requiring considerable space for its installation. Furthermore, during withstand voltage testing, the test equipment is at high potential, and the insulation distance between it and the surrounding grounding must be greater than 5 meters, further necessitating a spacious installation area. However, the compact structure and limited space of 500kV offshore substations make it difficult to meet these testing requirements. Summary of the Invention

[0007] Based on this, it is necessary to provide a GIS AC withstand voltage test tool to address the problem that the 220kV offshore substation GIS AC withstand voltage test method in the relevant technology is not suitable for the 500kV and above offshore substation GIS withstand voltage test. It can facilitate the 500kV and above offshore substation GIS withstand voltage test at the 220kV offshore substation.

[0008] A GIS AC withstand voltage test tool, comprising:

[0009] A corner assembly, comprising a corner can and a transfer conductor disposed within the corner can. The distal end of the corner can is configured to interface with the wall of a test reserved opening of the GIS. The distal end of the transfer conductor is configured to pass through the test reserved opening and connect to the shielding cover of the GIS.

[0010] a transverse extension assembly, the transverse extension assembly comprising a transverse extension tube and a first extension conductor passing through the transverse extension tube, the distal end of the transverse extension tube being connected to the proximal end of the corner can, and the distal end of the first extension conductor being electrically connected to the proximal end of the transfer conductor; and

[0011] A bushing assembly, the bushing assembly comprising an insulating bushing, a conductive rod passing through the insulating bushing, and a terminal block connected to the proximal end of the conductive rod, the distal end of the insulating bushing being connected to the proximal end of the transverse extension tube, the distal end of the conductive rod being electrically connected to the proximal end of the first extension conductor, and the terminal block being used to electrically connect to the test high-voltage lead.

[0012] In one embodiment, the GIS AC withstand voltage test tool also includes a docking assembly arranged between the horizontal extension assembly and the bushing assembly; the docking assembly includes a docking tank and a docking conductor passed through the docking tank, the opposite ends of the docking tank are respectively connected to the distal end of the insulating bushing and the proximal end of the horizontal extension tube, and the opposite ends of the docking conductor are respectively electrically connected to the distal end of the conductive rod and the proximal end of the first extension conductor.

[0013] In one embodiment, the GIS AC withstand voltage test tool further includes a flange, and the distal end of the insulating sleeve and the proximal end of the docking tank are connected and fixed via the flange; the distal end of the conductive rod and the proximal end of the docking conductor are both provided with a first shielding cover, and the two first shielding covers are electrically connected to each other and fixed to the flange;

[0014] The GIS AC withstand voltage test tool further includes a first pot-type insulator, through which the proximal end of the transverse extension tube and the distal end of the docking tank are connected and fixed. The proximal end of the first extension conductor and the distal end of the docking conductor are both provided with a second shielding cover, and the two second shielding covers are electrically connected to each other and fixedly connected to the first pot-type insulator.

[0015] The GIS AC withstand voltage test tool also includes a second pot-type insulator, the distal end of the transverse extension tube and the proximal end of the corner tank are connected and fixed via the second pot-type insulator, the distal end of the first extension conductor and the proximal end of the transfer conductor are both provided with a third shielding cover, and the two third shielding covers are electrically connected to each other and fixed to the second pot-type insulator.

[0016] In one embodiment, a shielding electrode is provided between the inner wall of the insulating sleeve and the conductive rod; the inner wall of the insulating sleeve, the conductive rod and the shielding electrode are coaxially arranged; the shielding electrode includes a metal sleeve, the distal end of the shielding electrode is connected to the flange, and the outer wall of the proximal end of the shielding electrode is surrounded by a conductive ring with a circular cross-section.

[0017] In one embodiment, the GIS AC withstand voltage test tool further includes a support frame; the support frame is connected to the docking tank, the insulating sleeve or the transverse extension pipe.

[0018] In one embodiment, the GIS AC withstand voltage test tool also includes a vertical extension component arranged between the corner component and the GIS; the vertical extension component includes a vertical extension tube and a second extension conductor passing through the vertical extension tube, the proximal end of the vertical extension tube is connected to the distal end of the corner tank, and the distal end of the vertical extension tube is used to connect with the test reserved opening wall of the GIS; the proximal end of the second extension conductor is electrically connected to the distal end of the transfer conductor, and the distal end of the second extension conductor is used to pass through the test reserved opening and then be connected to the shielding cover of the GIS.

[0019] In one embodiment, the GIS AC withstand voltage test tool also includes a third pot-type insulator, the proximal end of the vertical extension tube and the distal end of the corner tank are connected and fixed through the third pot-type insulator, the proximal end of the second extension conductor and the distal end of the transfer conductor are both provided with a fourth shielding cover, and the two fourth shielding covers are electrically connected to each other and connected and fixed to the third pot-type insulator.

[0020] In one embodiment, the insulating sleeve includes an insulating cylinder made of epoxy glass fiber material and a skirt circumferentially arranged around the outer wall of the insulating cylinder. The skirt is a silicone rubber skirt. The skirt is provided in plurality and is arranged in sequence along the axial direction of the insulating cylinder.

[0021] In one embodiment, the entire insulating skirt includes a first skirt and a second skirt alternately arranged in sequence along the axial direction of the insulating cylinder, and the distance between the outer contour of the first skirt and the outer wall of the insulating cylinder is greater than the distance between the outer contour of the second skirt and the outer wall of the insulating cylinder.

[0022] In one embodiment, the GIS AC withstand voltage test tool further includes one or more grading rings installed at the proximal end of the insulating sleeve, and the grading rings are arranged around the circumference of the terminal board.

[0023] The above-mentioned GIS AC withstand voltage test tooling is not only provided with a bushing assembly for electrically connecting to the test high-voltage lead, but also with a corner assembly and a horizontal extension assembly. Through the corner assembly and the horizontal extension assembly, the GIS shielding cover, transfer conductor, first extension conductor, conductive rod and terminal board can be electrically connected in sequence, and the bushing assembly can be arranged outside the offshore booster station, and the test voltage application position is changed from inside the offshore booster station to outside the offshore booster station, so that the test equipment and high-voltage leads can be arranged in a spacious area outside the offshore booster station, greatly increasing the insulation distance of each high-voltage part in the test circuit, and can facilitate the implementation of 500kV and above offshore booster station GIS withstand voltage tests in 220kV offshore booster stations. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural diagram of the GIS AC withstand voltage test tooling according to one embodiment of the present application.

[0025] Figure 2 for Figure 1 Enlarged structural diagram at point A.

[0026] Figure 3 for Figure 1 Enlarged structural diagram at B.

[0027] Figure 4 for Figure 1 Enlarged structural diagram at C.

[0028] Figure 5 for Figure 1 Structural diagram of the support frame in the device shown.

[0029] 10. Corner assembly; 11. Corner can; 12. Transfer conductor; 20. Lateral extension assembly; 21. Lateral extension tube; 22. First extension conductor; 30. Bushing assembly; 31. Insulating bushing; 32. Conductive rod; 33. Terminal block; 34. First skirt; 35. Second skirt; 36. Grading ring; 40. Docking assembly; 41. Docking can; 42. Docking conductor; 51. Flange; 52. First pot insulator; 53. Second pot insulator; 54. Third pot insulator; 61. First shielding cover; 62, second shielding cover; 63, third shielding cover; 64, fourth shielding cover; 70, vertical extension assembly; 71, vertical extension tube; 711, inflation interface; 712, density relay; 72, second extension conductor; 80, shielding electrode; 81, conductive ring; 90, support frame; 91, vertical rod; 92, horizontal rod; 93, diagonal rod; 94, diagonal brace; 95, support base; 96, universal wheel; 97, support top plate; 98, pad; 991, connecting plate; 992, connecting block. DETAILED DESCRIPTION

[0030] To make the above-mentioned objects, features, and advantages of the present application more clearly understood, the specific embodiments of the present application are described in detail below with reference to the accompanying drawings. The following description sets forth many specific details to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present application. Therefore, the present application is not limited to the specific embodiments disclosed below.

[0031] It should be noted that the distal end in this embodiment refers to the end away from the terminal block; conversely, the proximal end refers to the end close to the terminal block.

[0032] See Figures 1 to 4 , Figure 1 The figure shows the structure of the GIS AC withstand voltage test tooling according to one embodiment of the present application. Figure 2 Shown Figure 1 Enlarged structural diagram at point A. Figure 3 Shown Figure 1 Enlarged structural diagram at B. Figure 4 Shown Figure 1Enlarged structural diagram at point C. One embodiment of the present application provides a GIS AC withstand voltage test fixture, which includes a corner assembly 10, a transverse extension assembly 20, and a bushing assembly 30. The corner assembly 10 includes a corner pot 11 and a transition conductor 12 inserted into the corner pot 11. The distal end of the corner pot 11 is used to connect with the wall of the test reserved opening of the GIS, and the distal end of the transition conductor 12 is used to pass through the test reserved opening and connect to the shielding cover of the GIS. The transverse extension assembly 20 includes a transverse extension tube 21 and a first extension conductor 22 inserted into the transverse extension tube 21. The distal end of the transverse extension tube 21 is connected to the proximal end of the corner pot 11, and the distal end of the first extension conductor 22 is electrically connected to the proximal end of the transition conductor 12. The bushing assembly 30 includes an insulating bushing 31, a conductive rod 32 inserted into the insulating bushing 31, and a terminal board 33 connected to the proximal end of the conductive rod 32. The distal end of the insulating sleeve 31 is connected to the proximal end of the transverse extension tube 21 , the distal end of the conductive rod 32 is electrically connected to the proximal end of the first extension conductor 22 , and the terminal board 33 is used to electrically connect to the test high-voltage lead.

[0033] It should be noted that the angle formed by the proximal end of the corner tank 11 and the distal end of the corner tank 11 includes but is not limited to 45°, 90°, 135° or other angles, and can be flexibly adjusted and set according to actual needs.

[0034] It should be noted that the length of the transverse extension assembly 20, i.e., the distance between its two opposite ends, can be adjusted and set as needed, including but not limited to 6 to 15 meters. This length can be appropriately selected based on practical needs, allowing the casing assembly 30 to extend outside the offshore substation. Furthermore, increasing the length of the transverse extension assembly 20 extends the horizontal length of the test fixture, thereby increasing the insulation distance.

[0035] The aforementioned GIS AC withstand voltage test fixture not only features a bushing assembly 30 for electrical connection to the test high-voltage lead, but also includes a corner assembly 10 and a transverse extension assembly 20. These components enable sequential electrical connection of the GIS shield, transition conductor 12, first extension conductor 22, conductive rod 32, and terminal block 33. Furthermore, the bushing assembly 30 can be positioned outside the offshore substation, shifting the test voltage application location from inside the substation to outside. This allows the test equipment and high-voltage leads to be positioned in a spacious area outside the substation, significantly increasing the insulation distance between various high-voltage components in the test circuit. This facilitates conducting 500kV and above GIS withstand voltage tests at 220kV offshore substations. This test fixture addresses the challenges of limited insulation distances and the difficulty of arranging high-voltage leads and test equipment during AC withstand voltage tests on GIS at 500kV and above substations. After the test fixture and GIS are installed, the insulating bushing 31 is located outside the booster station, and the test voltage is applied there. The withstand voltage test equipment is located on the ground outside the booster station, creating a spacious test area and facilitating equipment layout. The high-voltage leads are also located outside the booster station, making layout easier and significantly increasing the insulation distance between high-voltage components in the test circuit, ensuring a safe and reliable test process.

[0036] See also Figures 1 to 4 In one embodiment, the GIS AC withstand voltage test tool further includes a docking assembly 40 disposed between the transverse extension assembly 20 and the bushing assembly 30. The docking assembly 40 includes a docking pot 41 and a docking conductor 42 disposed within the docking pot 41. The opposite ends of the docking pot 41 are respectively connected to the distal end of the insulating bushing 31 and the proximal end of the transverse extension tube 21. The opposite ends of the docking conductor 42 are respectively electrically connected to the distal end of the conductive rod 32 and the proximal end of the first extension conductor 22.

[0037] See also Figures 2 to 4 In one embodiment, the GIS AC withstand voltage test fixture further includes a flange 51. The distal end of the insulating sleeve 31 and the proximal end of the docking can 41 are connected and fixed via the flange 51. A first shielding cover 61 is provided at the distal end of the conductive rod 32 and the proximal end of the docking conductor 42. The two first shielding covers 61 are electrically connected to each other and fixed to the flange 51. In this way, the two first shielding covers 61 improve the electric field uniformity at the connection between the distal end of the conductive rod 32 and the proximal end of the docking conductor 42.

[0038] See also Figures 2 to 4 In some embodiments, the flange 51 includes but is not limited to being cast or injection molded as one piece with the insulating sleeve 31, which can improve the sealing performance of the connection portion between the two.

[0039] See also Figures 2 to 4In one embodiment, the GIS AC withstand voltage test fixture also includes a first pot insulator 52. The proximal end of the transverse extension tube 21 and the distal end of the docking can 41 are connected and fixed via the first pot insulator 52. The proximal end of the first extension conductor 22 and the distal end of the docking conductor 42 are each provided with a second shielding cover 62. The two second shielding covers 62 are electrically connected to each other and to the first pot insulator 52. In this way, the two second shielding covers 62 improve the electric field uniformity at the junction of the proximal end of the first extension conductor 22 and the distal end of the docking conductor 42.

[0040] See also Figures 2 to 4 In one embodiment, the GIS AC withstand voltage test fixture also includes a second pot insulator 53. The distal end of the transverse extension tube 21 and the proximal end of the corner can 11 are connected and fixed via the second pot insulator 53. A third shielding cover 63 is provided at the distal end of the first extension conductor 22 and the proximal end of the transition conductor 12. The two third shielding covers 63 are electrically connected to each other and to the second pot insulator 53. This improves the electric field uniformity at the junction between the distal end of the first extension conductor 22 and the proximal end of the transition conductor 12.

[0041] See also Figures 2 to 4 In one specific embodiment, the GIS AC withstand voltage test fixture further includes a vertical extension assembly 70 disposed between the corner assembly 10 and the GIS. The vertical extension assembly 70 includes a vertical extension tube 71 and a second extension conductor 72 passing through the interior of the vertical extension tube 71. The proximal end of the vertical extension tube 71 is connected to the distal end of the corner tank 11, and the distal end of the vertical extension tube 71 is used to connect with the wall of the test reserved opening of the GIS; the proximal end of the second extension conductor 72 is electrically connected to the distal end of the transfer conductor 12, and the distal end of the second extension conductor 72 is used to pass through the test reserved opening and connect to the shielding cover of the GIS. In this way, the vertical extension tube 71 increases the installation height of the test fixture, preventing the test fixture from colliding with the fast grounding switch operating mechanism at the GIS outlet position.

[0042] See also Figures 2 to 4 In one embodiment, the GIS AC withstand voltage test fixture also includes a third pot-type insulator 54. The proximal end of the vertical extension tube 71 and the distal end of the corner pot 11 are connected and fixed via the third pot-type insulator 54. The proximal end of the second extension conductor 72 and the distal end of the transition conductor 12 are both provided with a fourth shielding cover 64. The two fourth shielding covers 64 are electrically connected to each other and fixed to the third pot-type insulator 54. In this way, the two fourth shielding covers 64 improve the electric field uniformity at the connection between the proximal end of the second extension conductor 72 and the distal end of the transition conductor 12.

[0043] In some embodiments, at least one through-hole is provided in each of the first pot insulator 52, the second pot insulator 53, and the third pot insulator 54, allowing interconnectedness within the entire test fixture—the corner tank 11, the transverse extension tube 21, the vertical extension tube 71, and the docking tank 41—enabling the circulation of SF6 gas. Furthermore, a gas charging port 711 is formed on the wall of the vertical extension tube 71 for filling and recovering SF6 gas from the test fixture's gas chamber. Furthermore, a density relay 712 is provided on the vertical extension tube 71 for detecting the SF6 gas pressure within the test fixture's gas chamber.

[0044] In some embodiments, the transfer conductor 12 is coaxially arranged with the transfer tank; the first extension conductor 22 is coaxially arranged with the horizontal extension tube 21; the conductive rod 32 is coaxially arranged with the insulating sleeve 31; the docking conductor 42 is coaxially arranged with the docking tank 41; and the second extension conductor 72 is coaxially arranged with the vertical extension tube 71. This can help reduce the electric field strength at the docking location and improve the uniformity of the electric field distribution.

[0045] In some embodiments, a shielding electrode 80 is provided between the inner wall of the insulating sleeve 31 and the conductive rod 32. Specifically, the inner wall of the insulating sleeve 31, the conductive rod 32 and the shielding electrode 80 are coaxially arranged. The shielding electrode 80 includes a metal sleeve, the distal end of the shielding electrode 80 is connected to the flange 51, and the outer wall of the proximal end of the shielding electrode 80 is surrounded by a conductive ring 81 with a circular cross-section. The conductive ring 81 is solid and has a good voltage equalization effect. The shielding electrode 80 maintains zero potential, greatly reducing the field strength at the flange 51, solving the problem of uneven electric field distribution inside the insulating sleeve 31, and improving the insulation performance inside the insulating sleeve 31. In addition, in order to improve the insulation performance, the interior of the insulating sleeve 31 is filled with, for example, 0.4 MPa SF6 gas as an insulating medium.

[0046] In some embodiments, the insulating sleeve 31 is a composite insulating sleeve 31 with excellent electrical performance. Specifically, the insulating sleeve 31 includes an insulating barrel made of epoxy glass fiber material, which has greater mechanical properties than traditional ceramic insulating sleeves 31, has high toughness and low brittleness, and is less prone to breakage or fracture.

[0047] In some embodiments, the insulating sleeve 31 further includes an insulating skirt circumferentially disposed around the outer wall of the insulating tube. This insulating skirt, including but not limited to a skirt made of silicone rubber, offers advantages such as high elasticity, high bending strength, and resistance to breakage. Multiple insulating skirts may be provided and spaced apart axially along the insulating tube. This provides excellent insulation performance and high mechanical strength.

[0048] The distance between the two opposite sides of the radial cross section of the insulating skirt decreases in the direction away from the central axis of the insulating cylinder, and the overall shape is umbrella-shaped, specifically including but not limited to triangle, trapezoid or other irregular shapes.

[0049] In one embodiment, all insulating skirts include first and second skirts 34 and 35, arranged alternately along the axial direction of the insulating sleeve. The distance between the outer contour of the first skirt 34 and the outer wall of the insulating sleeve is greater than the distance between the outer contour of the second skirt 35 and the outer wall of the insulating sleeve. Furthermore, all insulating skirts are evenly spaced. This design of multiple insulating skirts not only increases the insulation creepage distance but also reduces the length of the insulating sleeve 31, thereby further reducing the weight of the insulating sleeve 31.

[0050] In one embodiment, the GIS AC withstand voltage test fixture further includes one or more grading rings 36 installed at the proximal end of the insulating sleeve 31. The grading rings 36 are arranged circumferentially around the terminal block 33. Specifically, the grading rings 36 are secured to the proximal end of the insulating sleeve 31 using fasteners such as, but not limited to, bolts, screws, pins, rivets, and clips. The grading rings 36 ensure a uniform electric field between the end of the insulating sleeve 31 and the terminal block 33, mitigate high-voltage corona discharge, and prevent it from affecting the measurement of partial discharge signals.

[0051] In some embodiments, the terminal board 33 is provided with a through hole for connecting to the test high voltage lead, and the connection method is specifically, for example, a bolt connection, and the connection is tight and reliable.

[0052] See also Figure 1 and Figure 5 In some embodiments, the GIS AC withstand voltage test fixture further includes a support frame 90. The support frame 90 includes but is not limited to being connected to the docking tank 41, the insulating sleeve 31, or the horizontal extension tube 21, and is used to support and fix the test fixture. Its height can be flexibly adjusted by increasing or decreasing the number of steel pipe sections of the vertical rod 91 according to the height of the test fixture from the ground. The support frame 90 has a simple structure, is easy and fast to assemble, and has high stability, meeting the support height and support stability requirements of the test fixture. In addition, the support frame 90 can reduce the force acting on the screw connecting the vertical extension tube 71 and the test reserved interface, so that the test fixture can be installed stably and firmly.

[0053] See also Figure 1 and Figure 5In some embodiments, the support frame 90 includes vertical rods 91, horizontal rods 92, diagonal rods 93, diagonal braces 94, a support base 95, universal wheels 96, a support top plate 97, and a spacer 98. The support frame 90 is provided with a support base 95 at the bottom and a support top plate 97 at the top. For example, four vertical rods 91 are provided between the support base 95 and the support top plate 97. The vertical rods 91 are composed of multiple sections of circular steel pipes that can be spliced ​​together in the vertical direction. The number of sections of the steel pipe can be increased or decreased according to the height of the test fixture from the ground to meet the height requirements of different tests. Connecting plates 991 are provided at both ends of the steel pipe, and the two connecting plates 991 are connected and fixed by screws. The four vertical rods 91 at the lower end are connected to the support base 95, between each section of the vertical rods 91, and the four vertical rods 91 at the upper end are connected to the support top plate 97 through the connecting plates 991.

[0054] In addition, a connecting block 992 is provided on the inner side of the vertical rod 91 near the connecting plate 991. A cross bar 92 is provided between adjacent vertical rods 91. The cross bar 92 can be made of, for example, an angle steel or a steel pipe. The opposite ends of the cross bar 92 are connected to the connecting blocks 992 of the adjacent vertical rod 91 by screws. An inclined rod 93 is provided between the upper and lower cross bars 92 to strengthen the connection of the support frame 90. The inclined rod 93 can be made of, for example, an angle steel or a steel pipe. The opposite ends of the inclined rod 93 are connected to the connecting blocks 992 of the vertical rod 91 by screws. A diagonal brace 94 is designed between the lower vertical rod 91 and the support base 95 to strengthen the support rigidity, so that the support frame 90 is not easy to tip over. The diagonal brace 94 can be made of, for example, an angle steel or a steel pipe. The upper end of the diagonal brace 94 is hinged to the vertical rod 91 through a hinge plate on the outside of the vertical rod 91, and the lower end is hinged to the support base 95 through a vertical plate on the support base 95.

[0055] In addition, universal wheels 96 are designed at the four bottom corners of the support base 95. The universal wheels 96 can rotate 360 ​​degrees at will, and can flexibly move and adjust the position of the support frame 90. The universal wheels 96 are designed with fixing plates. After the support frame 90 is adjusted to the appropriate position, the universal wheels 96 can be locked through the fixing plates to prevent the support frame 90 from moving. The universal wheels 96 are made of rubber and can be stably fixed on the ground. A pad 98 is designed on the upper surface of the support top plate 97. The pad 98 is made of nylon and is used to support and fix the docking tank 41.

[0056] The implementation process of the GIS AC withstand voltage test tool in one embodiment includes the following steps:

[0057] (1) First, determine the location of the test tool access window on the bulkhead of the 500kV GIS equipment room in the offshore booster station, and then use electric welding to cut the test tool access window on the bulkhead.

[0058] (2) Assemble the corner assembly 10, the lateral extension assembly 20, the sleeve assembly 30, the docking assembly 40 and the vertical extension assembly 70 into a test fixture.

[0059] (3) Use a gantry crane or a car crane to lift the test fixture, and pass the vertical extension component 70 of the test fixture through the test fixture access window into the GIS equipment room.

[0060] (4) Install and connect the vertical extension pipe 71 and the second extension conductor 72 to the GIS under test.

[0061] (5) According to the height of the test fixture from the ground, the number of steel pipe sections of the vertical rod 91 is reasonably selected to match the height of the support frame 90 with the height of the test fixture from the ground, and the support frame 90 is assembled. Then, the support frame 90 is moved so that the pad 98 on the top plate of the support frame 90 supports the lower end surface of the straight-through docking tank 41. Activate the fixing plate to lock the universal wheel 96 to fix the position of the support frame 90.

[0062] (6) Connect the vacuum device to the charging interface 711 and evacuate the internal air chamber of the test fixture to a vacuum state. The vacuum degree is required to be less than 100 Pa. Then connect the SF6 gas cylinder to the charging interface 711 and fill the internal air chamber of the test fixture with SF6 gas as an insulating medium. Use the density relay to detect the air chamber pressure to 0.4 MPa and then let it stand for 24 hours.

[0063] (7) After the SF6 gas has been allowed to rest, a water content test is conducted on it. The water content is required to be no more than 250µL / L. After the water content test is passed, the test fixture is installed and voltage can be applied to the GIS under test through the test fixture to conduct an AC withstand voltage test.

[0064] In the description of this application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0065] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include at least one of such features. In the description of this application, if the term "plurality" appears, "plurality" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0066] In this application, unless otherwise specified or limited, the terms "mounted," "connected," "connected," "fixed," etc., should be interpreted broadly. For example, these terms may refer to fixed connections, removable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediary; and internal communication between two components or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0067] In this application, unless otherwise expressly specified or limited, if a first feature is described as being "above" or "below" a second feature, or similar descriptions, this may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Furthermore, when a first feature is described as being "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is described as being "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0068] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be an intermediate element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an intermediate element. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only embodiment.

[0069] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0070] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present patent application shall be determined by the appended claims.

Claims

1. A GIS AC withstand voltage test tool, characterized in that: The GIS AC withstand voltage test tooling includes: A corner assembly, comprising a corner can and a transfer conductor disposed within the corner can. The distal end of the corner can is configured to interface with the wall of a test reserved opening of the GIS. The distal end of the transfer conductor is configured to pass through the test reserved opening and connect to the shielding cover of the GIS. a transverse extension assembly, the transverse extension assembly comprising a transverse extension tube and a first extension conductor passing through the transverse extension tube, the distal end of the transverse extension tube being connected to the proximal end of the corner can, and the distal end of the first extension conductor being electrically connected to the proximal end of the transfer conductor; and A bushing assembly, the bushing assembly comprising an insulating bushing, a conductive rod passing through the insulating bushing, and a terminal block connected to the proximal end of the conductive rod, the distal end of the insulating bushing being connected to the proximal end of the transverse extension tube, the distal end of the conductive rod being electrically connected to the proximal end of the first extension conductor, and the terminal block being used to electrically connect to the test high-voltage lead.

2. The GIS AC withstand voltage test tool according to claim 1 is characterized in that: The GIS AC withstand voltage test tool also includes a docking assembly arranged between the horizontal extension assembly and the bushing assembly; the docking assembly includes a docking tank and a docking conductor inserted into the docking tank, the opposite ends of the docking tank are respectively connected to the distal end of the insulating bushing and the proximal end of the horizontal extension tube, and the opposite ends of the docking conductor are respectively electrically connected to the distal end of the conductive rod and the proximal end of the first extension conductor.

3. The GIS AC withstand voltage test tool according to claim 2, characterized in that: The GIS AC withstand voltage test tool further includes a flange, through which the distal end of the insulating sleeve and the proximal end of the docking tank are connected and fixed; the distal end of the conductive rod and the proximal end of the docking conductor are both provided with a first shielding cover, and the two first shielding covers are electrically connected to each other and fixedly connected to the flange; The GIS AC withstand voltage test tool further includes a first pot-type insulator, through which the proximal end of the transverse extension tube and the distal end of the docking tank are connected and fixed. The proximal end of the first extension conductor and the distal end of the docking conductor are both provided with a second shielding cover, and the two second shielding covers are electrically connected to each other and fixedly connected to the first pot-type insulator. The GIS AC withstand voltage test tool also includes a second pot-type insulator, the distal end of the transverse extension tube and the proximal end of the corner tank are connected and fixed via the second pot-type insulator, the distal end of the first extension conductor and the proximal end of the transfer conductor are both provided with a third shielding cover, and the two third shielding covers are electrically connected to each other and fixed to the second pot-type insulator.

4. The GIS AC withstand voltage test tool according to claim 3 is characterized in that: A shielding electrode is provided between the inner wall of the insulating sleeve and the conductive rod; the inner wall of the insulating sleeve, the conductive rod and the shielding electrode are coaxially arranged; the shielding electrode includes a metal sleeve, the distal end of the shielding electrode is connected to the flange, and the outer wall of the proximal end of the shielding electrode is surrounded by a conductive ring with a circular cross-section.

5. The GIS AC withstand voltage test tool according to claim 2, characterized in that: The GIS AC withstand voltage test tool further includes a support frame; the support frame is connected to the docking tank, the insulating sleeve or the transverse extension pipe.

6. The GIS AC withstand voltage test tool according to claim 1, characterized in that: The GIS AC withstand voltage test tool also includes a vertical extension component arranged between the corner component and the GIS; the vertical extension component includes a vertical extension tube and a second extension conductor passing through the vertical extension tube, the proximal end of the vertical extension tube is connected to the distal end of the corner tank, and the distal end of the vertical extension tube is used to connect with the test reserved opening wall of the GIS; the proximal end of the second extension conductor is electrically connected to the distal end of the transfer conductor, and the distal end of the second extension conductor is used to pass through the test reserved opening and then connect to the shielding cover of the GIS.

7. The GIS AC withstand voltage test tool according to claim 6, characterized in that: The GIS AC withstand voltage test tool also includes a third pot-type insulator, the proximal end of the vertical extension tube and the distal end of the corner tank are connected and fixed through the third pot-type insulator, the proximal end of the second extension conductor and the distal end of the transfer conductor are both provided with a fourth shielding cover, and the two fourth shielding covers are electrically connected to each other and fixed to the third pot-type insulator.

8. The GIS AC withstand voltage test tool according to claim 1, characterized in that: The insulating sleeve includes an insulating cylinder made of epoxy glass fiber material and a skirt circumferentially arranged around the outer wall of the insulating cylinder. The skirt is a silicone rubber skirt. There are multiple skirts and they are arranged in sequence along the axial direction of the insulating cylinder.

9. The GIS AC withstand voltage test tool according to claim 8, characterized in that: All the insulating skirts include a first skirt and a second skirt alternately arranged in sequence along the axial direction of the insulating cylinder, and the distance between the outer contour of the first skirt and the outer wall of the insulating cylinder is greater than the distance between the outer contour of the second skirt and the outer wall of the insulating cylinder.

10. The GIS AC withstand voltage test tool according to any one of claims 1 to 9, characterized in that: The GIS AC withstand voltage test tool further includes one or more grading rings installed at the proximal end of the insulating sleeve, and the grading rings are arranged around the circumference of the terminal board.

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