A two-way connector and a connection device for power frequency withstand voltage testing of GIS equipment.

Abstract

This invention discloses a two-way connector and a connection device for power frequency withstand voltage testing of GIS equipment. The connector body includes a cavity. A first connection structure and a second connection structure, communicating with the cavity, are fixedly connected to the connector body. A first turntable, axially limited and circumferentially rotatable, is coaxially connected to the first connection structure. A second turntable, also axially limited and circumferentially rotatable, is coaxially connected to the second connection structure. The first and second turntables are connected via a deformable three-phase busbar located within the cavity. This invention is not only simple in structure and easy to use, but also widely applicable to prefabricated 110kV GIS equipment in various application scenarios.

Description

Technical Field

[0001] This invention discloses a two-way connector and a connecting device, belonging to the field of power frequency withstand voltage test technology for GIS equipment. Specifically, it discloses a two-way connector and a connecting device for power frequency withstand voltage test of GIS equipment. Background Technology

[0002] Prefabricated substations offer advantages such as short commissioning cycles, lack of environmental constraints, and simple maintenance. Based on these advantages, prefabricated 110kV GIS equipment addresses challenges in extreme application scenarios such as deep mountains, plateaus, snowfields, and deserts, as well as in densely populated urban environments and post-disaster power restoration, demonstrating good engineering application results and broad application prospects. Power frequency withstand voltage testing is a crucial step that must be completed before the prefabricated 110kV GIS equipment is put into operation in a substation. It is used to test the insulation level of the GIS equipment after on-site installation, identify insulation defects, and assess overvoltage capacity. However, different GIS equipment may have "ABC" forward phase sequence and "CBA" reverse phase sequence arrangements at the outlet. Therefore, there is an urgent need to develop a two-way connector and connection device that can be widely applied to prefabricated 110kV GIS equipment in different application scenarios. Summary of the Invention

[0003] In view of the technical problems existing in the prior art, the present invention provides a two-way connector and a connection device for power frequency withstand voltage test of GIS equipment. It is not only simple in structure and easy to use, but also widely applicable to prefabricated 110kV GIS equipment in different application scenarios.

[0004] This invention discloses a two-way connector, including a connector body with a cavity inside. A first connection structure and a second connection structure communicating with the cavity are fixedly connected to the connector body. A first turntable with axial limiting and circumferential rotation is coaxially connected to the first connection structure. A second turntable with axial limiting and circumferential rotation is coaxially connected to the second connection structure. The first turntable and the second turntable are connected by a deformable three-phase busbar located inside the cavity.

[0005] In a preferred embodiment of the present invention, both the first turntable and the second turntable are provided with busbar mounting holes for connecting the three-phase busbar.

[0006] In a preferred embodiment of the present invention, there are three busbar mounting holes, and the line connecting the centers of the three busbar mounting holes forms an equilateral triangle, the center of which coincides with the center of the first turntable or the second turntable.

[0007] In a preferred embodiment of the present invention, the first connecting structure is located on the side of the connector body, and the second connecting structure is located on the top surface of the connector body.

[0008] In a preferred embodiment of the present invention, the first connecting structure is provided with an angle scale for indicating the rotation angle of the first turntable relative to the initial position; the second connecting structure is provided with an angle scale for indicating the rotation angle of the second turntable relative to the initial position.

[0009] In a preferred embodiment of the present invention, the first connecting structure or the second connecting structure is provided with a circular groove for accommodating the first turntable or the second turntable, the shape of the circular groove corresponding to the shape of the first turntable or the second turntable, and a cover plate for axially limiting the first turntable or the second turntable is provided on the outer side of the circular groove, the cover plate being detachably fixed to the first connecting structure or the second connecting structure.

[0010] In a preferred embodiment of the present invention, the cavity is filled with a granular insulating medium.

[0011] In a preferred embodiment of the present invention, the first turntable and the through hole are filled with sealing rings; the second turntable and the through hole are filled with sealing rings.

[0012] The present invention also discloses a connection device for power frequency withstand voltage testing of GIS equipment, including a telescopic bracket and a two-way connector, wherein the telescopic end of the telescopic bracket is connected to the two-way connector.

[0013] In a preferred embodiment of the present invention, the device further includes a first GIL busbar, a second GIL busbar, and a three-phase test bushing. The first GIL busbar is connected to the three-phase busbar of the second turntable of the two-way connector, the second GIL busbar is connected to the three-phase busbar on the first turntable of the two-way connector, one end of the second GIL busbar away from the two-way connector is connected to the three-phase test bushing, and the other end of the first GIL busbar away from the two-way connector is used to connect to the GIS equipment to be tested.

[0014] In a preferred embodiment of the present invention, a power frequency withstand voltage test power supply is further included, which is electrically connected to a three-phase test bushing.

[0015] In a preferred embodiment of the present invention, the first GIL busbar includes a GIS equipment connection part and a two-way connector connection part, the length of which corresponds to the distance between the two-way connector and the GIS equipment to be tested.

[0016] In a preferred embodiment of the present invention, the prefabricated cabin of the GIS equipment to be tested is provided with a side-opening door or a maintenance port reserved on the side of the cabin.

[0017] The beneficial effects of this invention are as follows: This invention has the advantages of simple structure, convenient use, high compatibility, and wide applicability to prefabricated 110kV GIS equipment in different application scenarios. It introduces a brand-new two-way connector, the structure of which includes a connector body with a cavity inside. A first connection structure and a second connection structure communicating with the cavity are fixedly connected to the connector body. A first turntable with axial limiting and circumferential rotation is coaxially connected to the first connection structure. A second turntable with axial limiting and circumferential rotation is coaxially connected to the second connection structure. The first turntable and the second turntable are connected by a deformable three-phase busbar located in the cavity. This realizes that for different GIS equipment, there are "ABC" forward phase sequence and "CBA" reverse phase sequence arrangement at the outlet. By rotating the angle of the first GIL busbar 4, the phase sequence can be matched with that at the GIS outlet. At the same time, by rotating the three-phase test sleeve, the ABC three-phase of the sleeve can be matched with the ABC three-phase phase sequence at the outlet of the second GIL busbar. The wiring method is simple to operate and has good versatility.

[0018] Furthermore, the present invention also discloses that both the first turntable and the second turntable are provided with busbar mounting holes for connecting three-phase busbars. There are three busbar mounting holes, and the line connecting the centers of the three busbar mounting holes forms an equilateral triangle. The center of the equilateral triangle coincides with the center of the first turntable or the second turntable. This structural design is more conducive to the rotational adjustment of the phase sequence and realizes the phase sequence matching with the GIS outlet.

[0019] Furthermore, the first connection structure of the present invention is located on the side of the connector body, and the second connection structure is located on the top surface of the connector body. The height difference between the first connection structure and the second connection structure can be adapted to the height difference between the GIS equipment to be tested and the power frequency withstand voltage test power supply, fully taking into account safety requirements such as minimum safe clearance and minimum electrical distance between equipment, and simplifying the complexity of the connection device used for power frequency withstand voltage testing of GIS equipment.

[0020] Furthermore, the first connecting structure of the present invention is provided with an angle scale for marking the rotation angle of the first turntable relative to the initial position; the second connecting structure is provided with an angle scale for marking the rotation angle of the second turntable relative to the initial position. This technical solution facilitates the precise adjustment of the turntable by technicians.

[0021] Furthermore, the first or second connecting structure of the present invention is provided with a circular groove for accommodating the first or second turntable. The shape of the circular groove corresponds to the shape of the first or second turntable. A cover plate for axially limiting the first or second turntable is provided on the outside of the circular groove. The cover plate is detachably fixed to the first or second connecting structure. This technical solution is more conducive to the assembly and use of the turntable.

[0022] Furthermore, the cavity of the present invention is filled with a granular insulating medium, and this structural design can effectively prevent leakage.

[0023] Furthermore, the first turntable and the through hole of the present invention are filled with sealing rings; the second turntable and the through hole are filled with sealing rings. This structural design can effectively ensure that the particulate insulating medium does not overflow.

[0024] Furthermore, the present invention also discloses a connection device for power frequency withstand voltage testing of GIS equipment, including a telescopic bracket. The telescopic end of the telescopic bracket is connected to a two-way connector. The three-phase busbar on the first turntable of the two-way connector is connected to the power frequency withstand voltage test power supply through the second GIL busbar and the three-phase test sleeve. The three-phase busbar on the second turntable of the two-way connector is connected to the GIS equipment under test through the first GIL busbar. For prefabricated GIS equipment under test with different base heights, the height of the connection device and the equipment under test can be matched in the vertical direction by adjusting the height of the telescopic bracket; for GIS equipment under test with different chamber sizes;

[0025] Furthermore, one end of the second GIL busbar of the present invention is provided with a third connection structure for connecting to the first connection structure, and the other end is provided with a fourth connection structure for connecting to the three-phase test bushing; one end of the first GIL busbar is provided with a fifth connection structure for connecting to the second connection structure, and the first GIL busbar includes multiple first GIL busbars of different lengths. This technical solution can achieve length matching between the connection device and the test equipment in the horizontal direction by selecting transverse GIL busbar segments of different lengths.

[0026] Furthermore, the prefabricated cabin of the GIS equipment to be tested in this invention is provided with a side-opening door or a maintenance port reserved on the side of the cabin. It connects to the GIS equipment under test through the prefabricated cabin side door or the reserved maintenance port, which is not restricted by the opening method and size of the prefabricated cabin, and is almost unaffected by rain or snow. It is also convenient for use in harsh application scenarios such as wind, sand, and hail. When using the connection device with the two-way connector of this invention, for different GIS equipment outlets with "ABC" forward phase sequence and "CBA" reverse phase sequence arrangements, the phase sequence can be matched with the GIS outlet by rotating the angle of the first GIL busbar 4. Simultaneously, rotating the three-phase test bushing matches the ABC three-phase sequence of the bushing with the ABC three-phase sequence at the outlet of the second GIL busbar. The wiring method is simple to operate and has good versatility. The entire device is designed with full consideration of safety requirements such as minimum safe clearance and minimum live distance between equipment. It is also easy to move and can be flexibly arranged according to test requirements, making it widely applicable to prefabricated cabin-type 110kV GIS equipment in different application scenarios. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of a two-way connector provided by the present invention;

[0028] Figure 2 This is a schematic diagram of the second turntable of a two-way connector provided by the present invention;

[0029] Figure 3 This is a schematic diagram of the first turntable of a two-way connector provided by the present invention;

[0030] Figure 4 This is a schematic diagram of a connection device for power frequency withstand voltage testing of GIS equipment provided by the present invention;

[0031] Figure 5 This is a schematic diagram of the first GIL busbar of a connection device for power frequency withstand voltage testing of GIS equipment provided by the present invention;

[0032] Figure 6 This is a side view of the first GIL busbar of a connection device for power frequency withstand voltage testing of GIS equipment provided by the present invention;

[0033] Figure 7 This is a schematic diagram of the first GIL busbar of a connection device for power frequency withstand voltage testing of GIS equipment provided by the present invention;

[0034] Figure 8 This is a side view of the first GIL busbar of a connection device for power frequency withstand voltage testing of GIS equipment provided by the present invention;

[0035] Figure 9This is a schematic diagram of the first GIL busbar of a connection device for power frequency withstand voltage testing of GIS equipment provided by the present invention;

[0036] Figure 10 This is a schematic diagram of a three-phase test bushing (ABC forward phase sequence) for a connection device used in power frequency withstand voltage testing of GIS equipment, provided by the present invention.

[0037] Figure 11 This is a schematic diagram of a three-phase test bushing (CBA forward phase sequence) for a connection device used in power frequency withstand voltage testing of GIS equipment, provided by the present invention.

[0038] Figure 12 This is a cross-sectional view of a three-phase test bushing for a connection device used in power frequency withstand voltage testing of GIS equipment, provided by the present invention.

[0039] Figure 13 This is a schematic diagram of a retractable bracket for a connection device used in power frequency withstand voltage testing of GIS equipment, provided by the present invention.

[0040] Figure 14 This is a top view of a retractable bracket for a connection device used in power frequency withstand voltage testing of GIS equipment, provided by the present invention.

[0041] Figure 15 This is a schematic diagram of the second GIL busbar of a connection device for power frequency withstand voltage testing of GIS equipment provided by the present invention;

[0042] Figure 16 This is a bottom view of the second GIL busbar of a connection device for power frequency withstand voltage testing of GIS equipment provided by the present invention;

[0043] Figure 17 This is a side view of the second GIL busbar of a connection device for power frequency withstand voltage testing of GIS equipment provided by the present invention;

[0044] Figure 18 This invention provides an embodiment of an axially limited and circumferentially rotatable connection between a connection structure of a connection device for power frequency withstand voltage testing of GIS equipment and a turntable;

[0045] In the diagram, 1-three-phase test bushing; 2-two-way connector; 3-telescopic bracket; 4-first GIL busbar; 5-power frequency withstand voltage test power supply; 6-test wiring; 7-GIS equipment to be tested; 8-prefabricated 110kV GIS equipment connection device; 9-prefabricated cabin side door or reserved maintenance port; 10-second GIL busbar; 11-connection structure; 12-fastening nut; 13-connector body; 14-three-phase busbar; 15-turntable; 16-fastening bolt; 17-cavity; 18-cover plate. Detailed Implementation

[0046] The technical solutions (including preferred technical solutions) of the present invention will be further described in detail below with reference to the accompanying drawings and by way of listing some optional embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0047] This invention discloses a two-way connector, including a connector body 13, a cavity 17 provided inside the connector body 13, a first connection structure and a second connection structure fixedly connected to the connector body 13 and communicating with the cavity, a first turntable coaxially connected to the first connection structure with axial limiting and circumferential rotatable, a second turntable coaxially connected to the second connection structure with axial limiting and circumferential rotatable, the first turntable and the second turntable are connected by a deformable three-phase busbar 14, the three-phase busbar 14 being located inside the cavity 17.

[0048] Preferably, both the first turntable and the second turntable are provided with busbar mounting holes for connecting the three-phase busbar 14.

[0049] Preferably, there are 3 busbar mounting holes, and the line connecting the centers of the 3 busbar mounting holes forms an equilateral triangle, with the center of the equilateral triangle coinciding with the center of the first turntable or the second turntable.

[0050] Preferably, the present invention includes a connector body 13, a cavity 17 is provided inside the connector body 13, a first connecting structure and a second connecting structure are fixedly connected to the side wall of the connector body 13, the central axis of the first connecting structure and the central axis of the second connecting structure intersect perpendicularly, a first turntable with axial limiting and circumferential rotation is coaxially connected to the first connecting structure, a second turntable with axial limiting and circumferential rotation is coaxially connected to the second connecting structure, the first turntable and the second turntable are connected by a deformable three-phase busbar 14, the three-phase busbar 14 is located in the cavity 17, a through hole corresponding to the shape of the first turntable and the second turntable is provided on the side wall of the connector body 13, and a fastening nut 12 is fixedly connected to both the first connecting structure and the second connecting structure, which are arranged symmetrically with respect to their respective central axes, and the first turntable and the second turntable can rotate independently without interfering with each other.

[0051] Preferably, the fastening nuts 12 include 6 nuts, and the angle formed by the line connecting the center of any two adjacent fastening nuts 12 with the center of the first connecting structure or the second connecting structure is 60°.

[0052] Preferably, the three-phase busbar 14 includes three parallel L-shaped busbars, and the line connecting the centers of the three L-shaped busbars forms an equilateral triangle.

[0053] Preferably, the first connecting structure is provided with an angle scale for indicating the rotation angle of the first turntable relative to the initial position; the second connecting structure is provided with an angle scale for indicating the rotation angle of the second turntable relative to the initial position.

[0054] Preferably, the first and second connecting structures can be selected from connecting flanges, and both the first and second connecting structures are hexagonal.

[0055] Preferably, the cavity 17 is filled with a granular insulating medium.

[0056] Preferably, the first turntable and the through hole are filled with sealing rings; the second turntable and the through hole are filled with sealing rings.

[0057] Preferably, the first or second connecting structure is provided with a circular groove for accommodating the first or second turntable. The shape of the circular groove corresponds to the shape of the first or second turntable. A cover plate 18 for axially limiting the first or second turntable is provided on the outer side of the circular groove. The cover plate 18 is detachably fixed to the first or second connecting structure. It should be noted that this is only one embodiment for axially limiting the turntable and rotatably connecting it to the connecting structure. For those skilled in the art, other technical solutions that can achieve the above functions also fall within the protection scope of this invention. This invention also discloses a connecting device for power frequency withstand voltage testing of GIS equipment, which includes a telescopic bracket 3 and a two-way connector. The telescopic end of the telescopic bracket 3 is connected to the two-way connector.

[0058] Preferably, it also includes a first GIL busbar 4, a second GIL busbar 10, and a three-phase test bushing 1. The first GIL busbar 4 is connected to the three-phase busbar 14 of the second turntable of the two-way connector. The second GIL busbar 10 is connected to the three-phase busbar 14 on the first turntable of the two-way connector. The end of the second GIL busbar 10 away from the two-way connector is connected to the three-phase test bushing 1. The end of the first GIL busbar 4 away from the two-way connector is used to connect to the GIS equipment 7 to be tested.

[0059] Preferably, it also includes a power frequency withstand voltage test power supply 5, which is electrically connected to the three-phase test bushing 1.

[0060] Preferably, the first GIL busbar 4 includes a GIS equipment connection part and a two-way connector connection part, the length of which corresponds to the distance between the two-way connector and the GIS equipment 7 to be tested.

[0061] Preferably, the prefabricated cabin of the GIS equipment 7 to be tested is provided with a side door or a maintenance port reserved on the side of the cabin.

[0062] Preferably, the telescopic bracket 3 is a linear cylinder, and the lifting end of the linear cylinder is provided with a two-way connector mounting seat, and the two-way connector mounting seat is provided with a screw for connecting the two-way connector.

[0063] The connection device of this invention can be used for power frequency withstand voltage testing of prefabricated 110kV GIS (Gas Insulated Gate Gas Transmission Line, hereinafter the same) equipment. The device includes a test bushing, a two-way connector, a telescopic support, a horizontally replaceable GIL (Gas Insulated Gate Metal Transmission Line, hereinafter the same) busbar, and a vertically fixed GIL busbar. The installation method is as follows: one end of the first GIL busbar is connected to the 110kV GIS equipment under test, and the other end is connected to the two-way connector via a flange. The other end of the two-way connector is connected to the vertically fixed GIL busbar via a flange. The other end of the second GIL busbar is connected to the three-phase test bushing via a flange. One end of the telescopic support is fastened to the two-way connector with bolts, and the other end contacts the ground for height adjustment and support. The test bushing is connected to the power frequency withstand voltage test equipment via a test line for power supply. This connection device can connect to the 110kV GIS inside the prefabricated cabin via a side door or a maintenance port reserved on the side of the cabin. Connecting GIS equipment to conduct power frequency withstand voltage tests overcomes the shortcomings of traditional prefabricated cabin top opening test methods, such as complex operation, large workload, and susceptibility to environmental constraints. By rotating the GIL busbar and test sleeve, the phase sequence arrangement at the outlet of different GIS equipment can be matched, which has the advantages of simple operation, wide applicability, and universal reliability.

[0064] Prefabricated modular substations offer advantages such as short commissioning cycles, lack of environmental constraints, and simple maintenance. Based on these advantages, prefabricated 110kV GIS equipment addresses challenges in extreme application scenarios such as deep mountains, plateaus, snowfields, and deserts, as well as in densely populated urban environments and post-disaster power restoration, demonstrating good engineering application results and broad application prospects. Power frequency withstand voltage testing is a crucial step that must be completed before the prefabricated 110kV GIS equipment is put into operation in a substation. It is used to test the insulation level of the GIS equipment after on-site hoisting, identify insulation defects, and assess overvoltage capability. The connection device of this invention is not used to detect insulation defects but rather to facilitate the conduct of power frequency withstand voltage testing, providing a universal connection device.

[0065] Currently, the power frequency withstand voltage test is conducted by opening the top of the prefabricated cabin and introducing test bushings from the top. This testing method has the following main technical problems: 1. Opening the top of the prefabricated cabin, i.e., lifting the top cover, can affect the operation of other equipment in the cabin, considering the on-site operational requirements such as insulation, live distance, and safety distance between high-voltage equipment. 2. The wiring for the power frequency withstand voltage test of the open-top prefabricated cabin GIS equipment involves the arrangement of bushings and leads inside the cabin. The insulation requirements between equipment must be considered, requiring a large number of on-site personnel and making the operation complex. 3. In harsh testing environments such as rain, snow, hail, and sandstorms, the top-opening testing method will seriously pollute the cabin environment, making it impossible to carry out the test process normally and severely restricting the testing and equipment modification and expansion process. 4. Due to the lack of a universal test connection device, when conducting power frequency tests on different GIS equipment or multiple identical GIS equipment, it is necessary to open the top of the prefabricated cabin and rewire multiple times, which is complex and involves a large amount of work.

[0066] Preferably, the device includes a telescopic bracket 3, the telescopic end of which is connected to a two-way connector. The three-phase busbar 14 on the first turntable of the two-way connector is connected to the power frequency withstand voltage test power supply 5 through the second GIL busbar 10 and the three-phase test sleeve 1. The three-phase busbar 14 on the second turntable of the two-way connector is connected to the GIS equipment 7 to be tested through the first GIL busbar 4.

[0067] Preferably, one end of the second GIL busbar 10 is provided with a third connection structure for connecting to the first connection structure, and the other end is provided with a fourth connection structure for connecting to the three-phase test bushing 1; one end of the first GIL busbar 4 is provided with a fifth connection structure for connecting to the second connection structure.

[0068] Preferably, the prefabricated cabin of the GIS equipment 7 to be tested is provided with a maintenance port reserved on the side or cabin side.

[0069] The two connecting structures 11 of this invention have six holes evenly distributed for installing fastening nuts 12, with a 60° interval between the holes. The three-phase busbars 14 are evenly spaced at 120° intervals between each phase. During manufacturing, aligning one phase busbar with one hole will align the other holes with the other spaced holes. When adjusting the angle to match the positive and negative phase sequence of the GIS outlet and the first GIL busbar 4, the rotation angle of each phase of the first GIL busbar 4 connected to the turntable 15 is 120° or 240°, and the corresponding hole rotation angle is also 120° or 240°. The remaining holes also rotate at 120° or 240°. Therefore, during positive and negative phase sequence adjustment, the angle adjustment stroke of the six holes is consistent with the angle adjustment stroke of the GIL busbar, ensuring that the holes can match during positive and negative phase sequences, thus guaranteeing reliable fastening of the first GIL busbar 4 and the two-way connector 2 during angle adjustment.

[0070] The invention will be further explained below with reference to the accompanying drawings:

[0071] Depend on Figure 4 As can be seen, the connection device in this invention consists of a three-phase test sleeve 1, a two-way connector 2, a telescopic bracket 3, a first GIL busbar 4, and a second GIL busbar 10. The first GIL busbar 4 is replaceable, and its length can be selected appropriately according to needs. The second GIL busbar 10 has a fixed length. One end of the connection device connects the two-way connector 2, the second GIL busbar 10, and the power frequency withstand voltage test device via a test wiring connection. The other end connects to the GIS equipment under test via the first GIL busbar 4 through a prefabricated cabin side door or a maintenance port reserved on the cabin side. The test wiring connection is fastened to the test sleeve with nuts and screws, and the phase sequence is determined according to the test requirements. The first GIL busbar 4 is connected to the GIS outlet after phase sequence matching.

[0072] Figure 10-12 One end of the three-phase test bushing 1 is fastened to the test wiring via nuts and screws, and the other end is connected to the outlet of the second GIL busbar 10. Since the phase sequence at the GIS equipment outlet exhibits both "ABC" positive phase sequence and "CBA" negative phase sequence, and the phase sequence at the outlet of the second GIL busbar 10 also has positive and negative variations, when connecting the three-phase test bushing 1 and the outlet of the second GIL busbar 10, it is necessary to match the corresponding phase sequence connection method of the three-phase test bushing 1 according to the phase sequence type of the second GIL busbar 10 outlet. Figure 10 and 11 The diagram shows the "ABC" positive phase sequence connection and the "CBA" negative phase sequence connection. By rotating the three-phase test bushing 1, select the appropriate phase sequence connection method. After confirming that it matches the phase sequence at the outlet of the second GIL busbar 10, tighten the nuts and screws to secure the connection. To ensure the minimum safe clearance for 110kV outdoor equipment, the top of the second GIL busbar 10 should be at least 2.5 meters above the ground.

[0073] Figure 4One end of the two-way connector 2 is securely connected to the second GIL busbar 10 via a flange, and the other end is connected to the first GIL busbar 4 via a flange. The bottom of the two-way connector 2 is fixed to the telescopic bracket 3 by four fastening bolts 16. The A, B, and C phase busbars of the first GIL busbar 4 and the second GIL busbar 10 are connected by a bend in the two-way connector 2. In the two-way connector 2, the A, B, and C phase busbars operate independently and reliably, and a certain bending angle is allowed. The cavity 17 inside the two-way connector 2 is filled with an insulating medium to isolate the voltage and current during the energization test. Considering that the GIL busbars of each phase of the first GIL busbar 4 have been insulated, the insulating medium filled in the hollow part of the two-way connector is mainly used to prevent equipment leakage and potential safety hazards. The insulating medium filled in the hollow part is fine-grained insulating gravel.

[0074] Figure 1-3 The two connecting structures 11 have six evenly distributed holes for installing fastening nuts 12, spaced 60° apart. The three-phase busbars 14 are spaced 120° apart for each phase. During manufacturing, aligning one phase busbar with one hole will align the other holes with the other spaced holes. When adjusting the angle to match the positive and negative phase sequence of the GIS outlet and the first GIL busbar 4, the rotation angle of each phase of the first GIL busbar 4 connected to the turntable 15 is 120° or 240°, and the corresponding hole rotation angle is also 120° or 240°. The remaining holes also rotate at 120° or 240°. Therefore, during positive and negative phase sequence adjustment, the angle adjustment stroke of the six holes is consistent with the angle adjustment stroke of the GIL busbar, ensuring that the holes can match in both positive and negative phase sequences, thus guaranteeing reliable fastening of the first GIL busbar 4 and the two-way connector 2 during angle adjustment.

[0075] Figure 5-9 The first GIL busbar section 4 is connected at one end to the two-way connector 2 via a flange, and at the other end to the GIS equipment outlet. The three-section replaceable busbar section is a universal type, with lengths as follows... Figure 5 , Figure 7 and Figure 9 As shown, it includes three specifications: 1 meter, 2 meters, and 2.5 meters. Other lengths can also be added according to actual test requirements. Based on the internal structure and surrounding environment of the prefabricated GIS equipment under test, a suitable length of transverse GIL busbar segment is selected to achieve horizontal length matching between the prefabricated GIS equipment under test and the connecting device. When rotating the first GIL busbar 4, the internal three-phase busbars and the outer sleeve rotate as a whole through the distributed insulating medium. By rotating the outer sleeve, the phase sequence of the internal three-phase busbars is adjusted.

[0076] Figure 13-14The telescopic bracket 3 is fixed to the two-way connector at its upper end by four fastening bolts 16, and its bottom is placed on the ground by foot pads. Since the total weight of the supported two-way connector 2, the second GIL busbar 10, and the three-phase test bushing 1 may be heavy, the telescopic bracket should be height-adjustable by hydraulic or electrical means to ensure that the height of the prefabricated GIS equipment under test and the connecting device is matched in the vertical direction. The bracket is equipped with working ground to avoid the risk of leakage in the event of insulation breakdown of the two-way connector.

[0077] Figure 15-17 The lower end of the second GIL busbar 10 is connected to the two-way connector 2 via a flange, and the upper three-phase busbar outlet is connected to the three-phase test bushing 1. Based on the adjusted A, B, and C phase sequence of the first GIL busbar 4, the busbar sequence of the second GIL busbar 10 is rotated accordingly. The placement direction of the three-phase test bushing 1 is consistent with the adjusted A, B, and C phase sequence of the second GIL busbar 10, thus achieving three-phase sequence matching with the GIS outlet. Figure 1-3 The holes on the connection structure of the two-way connector 2 and Figure 15-17 The arrangement of the three-phase busbars is consistent with the uniform arrangement of the six holes, and the corresponding arrangement of the three-phase busbars is also consistent with the arrangement of the six holes. Figure 15-17 Maintain consistency.

[0078] When conducting a power frequency withstand voltage test on the prefabricated GIS equipment under test, first open the prefabricated compartment side door or the maintenance port reserved on the side of the compartment at the outlet of the GIS equipment. Then, based on the internal layout of the prefabricated compartment and the position of the GIS equipment inside the compartment, select a suitable length of transverse GIL busbar segment, and adjust the height of the telescopic support according to the height of the GIS equipment and the minimum safety clearance required by the specification to achieve length matching. Check the phase sequence arrangement at the outlet of the GIS equipment. If the ABC phase sequence arrangement in the first GIL busbar 4 is opposite, rotate the angle of the first GIL busbar 4 to ensure that the A, B, and C phases of the two are accurately aligned, and connect them. Based on the determined phase sequence arrangement of the first GIL busbar 4, check the phase sequence arrangement at the outlet of the second GIL busbar 10. If the phase sequence at the outlet of the second GIL busbar 10 is "ABC" in the forward direction, then select... Figure 2 The ABC-type forward arrangement is used; if it is a "CBA" reverse phase sequence, then the ABC-type forward arrangement is selected. Figure 2The CBA-style reverse arrangement is used; other angular errors are accurately matched by fine-tuning the angle of the test sleeve. After matching the phase sequence of the outlet of the second GIL busbar 10 and the test sleeve, they are tightly connected. After connecting the second GIL busbar 10 and the test sleeve, this connection device is connected to the prefabricated GIS equipment under test and the power frequency withstand voltage test power supply. After ensuring that all connections are tight and the on-site test conditions are met, the test power supply is pressurized to carry out the power frequency withstand voltage test.

[0079] The power frequency withstand voltage test connection device for prefabricated GIS equipment involved in this invention can flexibly adjust the length of the first GIL busbar 4 and the height of the telescopic support according to the actual situation, adapting to different application scenarios and not being restricted by environmental factors such as weather, thus having wide applicability; by rotating the angle of the first GIL busbar 4 and the angle of the test sleeve, a suitable GIL busbar phase sequence can be selected, which can match the phase sequence arrangement at the outlet of different types of 110kV prefabricated GIS equipment, eliminating the need for repeated wiring, making operation simple, universal and reliable.

[0080] Those skilled in the art will readily understand that the above are merely preferred embodiments of the present invention and are not intended to limit the invention. Any modifications, combinations, substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A two-way connector, characterized by: The connector body (13) is provided with a cavity (17) therein, and a first connecting structure and a second connecting structure communicating with the cavity (17) are fixed on the connector body (13), the first connecting structure is coaxially connected with a first rotating disc which is axially limited and circumferentially rotatable, the second connecting structure is coaxially connected with a second rotating disc which is axially limited and circumferentially rotatable, and the first rotating disc and the second rotating disc are connected through a deformable three-phase tube bus (14) which is located in the cavity (17).

2. The two-way junction of claim 1, wherein: The first rotating disc and the second rotating disc are both provided with bus mounting holes for connecting the three-phase tube bus (14).

3. The two-way junction of claim 2, wherein: The bus mounting holes are three, and the center line of the three bus mounting holes is an equilateral triangle, and the center of the equilateral triangle coincides with the center of the first rotating disc or the second rotating disc.

4. The two-way junction of claim 1, wherein: The first connecting structure is located on the side surface of the connector body (13), and the second connecting structure is located on the top surface of the connector body (13).

5. The two-way junction of claim 1, wherein: The first connecting structure is provided with an angle scale for identifying the rotation angle of the first rotating disc relative to the initial position, and the second connecting structure is provided with an angle scale for identifying the rotation angle of the second rotating disc relative to the initial position.

6. The two-way junction of claim 1, wherein: The first connecting structure or the second connecting structure is provided with a circular groove for accommodating the first rotating disc or the second rotating disc, the shape of the circular groove corresponds to the shape of the first rotating disc or the second rotating disc, and the outer side of the circular groove is provided with a cover plate for axially limiting the first rotating disc or the second rotating disc, and the cover plate is detachably fixed with the first connecting structure or the second connecting structure.

7. The two-way junction of claim 1, wherein: The cavity (17) is filled with granular insulating medium.

8. A connecting device for power frequency voltage withstand test of GIS equipment, characterized in that: The two-way connector is connected with the telescopic support (3) at the telescopic end of the telescopic support (3).

9. The connecting device for power frequency voltage withstand test of GIS equipment according to claim 8, characterized in that: The two-way connector is further connected with a first GIL tube bus (4) and a second GIL tube bus (10), and the first GIL tube bus (4) is connected with the three-phase tube bus (14) of the second rotating disc of the two-way connector, and the second GIL tube bus (10) is connected with the three-phase tube bus (14) of the first rotating disc of the two-way connector, and the end of the second GIL tube bus (10) away from the two-way connector is connected with a three-phase test bushing (1), and the end of the first GIL tube bus (4) away from the two-way connector is used for connecting with a GIS device (7) to be detected.

10. The connecting device for power frequency voltage withstand test of GIS equipment according to claim 9, characterized in that: The two-way connector is further connected with a power frequency withstand voltage test power supply (5) which is electrically connected with the three-phase test bushing (1).

11. The connecting device for power frequency voltage withstand test of GIS equipment according to claim 9, characterized in that: The first GIL tube bus (4) comprises a GIS device connecting portion and a two-way connector connecting portion, and the length of the GIS device connecting portion corresponds to the distance between the two-way connector and the GIS device (7) to be detected.

12. The connecting device for power frequency voltage withstand test of GIS equipment according to claim 9, characterized in that: The side wall of the prefabricated cabin body of the GIS device (7) to be detected is provided with a side opening door or a cabin side reserved access hole.

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