Withstand voltage test device and method for 252kV GIS outgoing line sleeve

Abstract

The invention discloses a withstand voltage test device and method for 252kV GIS outgoing line bushings, and belongs to the technical field of outgoing line bushing detection, the device comprises a test cavity and a test assembly installed in the test cavity, and two groups of to-be-detected 252kV GIS outgoing line bushings are respectively installed at two ends of the test cavity; a to-be-detected 252kV GIS outgoing line sleeve is externally connected with the test cavity and internally connected with the test assembly, and the test assembly is connected with an electric connection port of the test transformer; and an inflation assembly is arranged in the test cavity. A to-be-detected 252kV GIS outgoing line sleeve is in internal and external connection with the test assembly and the test cavity respectively, a withstand voltage test is carried out after vacuumizing is carried out through the inflation assembly and the test cavity is filled with insulating gas, two outgoing line sleeves can be tested and detected at a time through double-station symmetrical design, a modular structure, multiple sealing and elastic contact finger connection, and the test efficiency is greatly improved. The test efficiency, the operation convenience and the accuracy of the test result are remarkably improved, and meanwhile the safety and the reliability of the test process are ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of outlet bushing detection, and in particular relates to a withstand voltage test device and method for a 252kV GIS outlet bushing. Background Art

[0002] With the rapid development of the global power industry and the continuous expansion of the scale of the power grid, high-voltage transmission technology, as an important part of power transmission, has received increasing attention for its safety and reliability. 252kV GIS (gas insulated switchgear) is a key equipment in the high-voltage transmission system. Its outlet bushing, as the incoming and outgoing part of the GIS switch, plays the role of safely and effectively separating the high-voltage part of the overhead busbar from the casing, ensuring the stable operation of the power system. In recent years, with the planning and commissioning of multiple 252kV lines, the demand for 252kV GIS outlet bushings has increased dramatically. This not only puts higher requirements on the manufacturing quality of GIS outlet bushings, but also poses severe challenges to the production capacity of manufacturers.

[0003] The industry has conducted in-depth research and practice on the test of 252kV GIS outlet bushings. At present, the test of GIS outlet bushings mainly includes two parts: leakage test and insulation test. The leakage test is to ensure the sealing performance inside the bushing to prevent the leakage of insulating gas and affect the insulation performance of the equipment; while the insulation test verifies the insulation strength of the bushing under high voltage environment through methods such as withstand voltage test. In the actual production process, manufacturers usually use special test equipment and processes, starting from the installation of the test product, through vacuuming, filling with insulating gas, withstand voltage test, recovery of insulating gas, to the final removal of the test product. The entire test process requires strict control of various parameters to ensure the accuracy of the test results.

[0004] Although the existing research is relatively mature, there are still some problems in practical application. First, the test process is time-consuming. Taking a certain project as an example, the complete test process of a 252kV GIS outlet bushing takes about 2 hours, which greatly limits the production capacity of the production line. Secondly, the test hall is occupied throughout the test process, and other tests or production activities cannot be carried out at the same time, resulting in a waste of resources. In addition, with the continuous growth of market demand, the existing test equipment and methods may be difficult to meet the needs of large-scale production. A more efficient and flexible test scheme is urgently needed to improve the efficiency of the withstand voltage test, shorten the test cycle, and increase the overall production capacity of the production line. Therefore, how to improve the efficiency of the withstand voltage test of the 252kV GIS outlet bushing has become a difficult problem that needs to be solved in existing projects. Summary of the invention

[0005] In order to overcome the shortcomings of the above-mentioned existing technologies, the purpose of the present invention is to provide a withstand voltage test device and method for a 252 kV GIS outgoing bushing, so as to solve the technical problems that the withstand voltage test process of the existing 252 kV GIS outgoing bushing takes a long time and occupies a large amount of resources, restricting the production capacity of the production line.

[0006] To achieve the above object, the present invention adopts the following technical solutions: The present invention discloses a withstand voltage test device for a 252 kV GIS outgoing bushing, including: a test chamber and a test assembly installed inside the test chamber, and two 252 kV GIS outgoing bushings to be detected are respectively installed at both ends of the test chamber; the 252 kV GIS outgoing bushing to be detected is connected to the outside of the test chamber and to the inside of the test assembly, and the test assembly is connected to the electrical connection port of the test transformer; an air filling assembly is arranged inside the test chamber.

[0007] Preferably, an opening is provided at the top of the test chamber, and a flange is arranged at the opening. The 252 kV GIS outgoing bushing to be detected is assembled and connected to the test chamber through the flange and kept sealed; A plurality of brackets are installed below the test chamber, and the 252 kV GIS outgoing bushing to be detected is connected to the test assembly inside the test chamber through the brackets.

[0008] Further preferably, the 252 kV GIS outgoing bushing to be detected includes a central conductor and a porcelain bushing sleeved on the surface of the central conductor; the top of the bracket is fixedly connected to the porcelain bushing.

[0009] Further preferably, a grading ring is provided at the top of the central conductor, and the grading ring is a tubular structure; a shielding assembly is sleeved on the central conductor.

[0010] Further preferably, the test chamber includes a bus housing, three-way housings installed at both ends of the bus housing, and a spherical cover plate installed at the bottom of the three-way housing; The inside of the 252 kV GIS outgoing bushing to be detected is connected to the test assembly through the central conductor, and the outside of the 252 kV GIS outgoing bushing to be detected is connected to the outside of the three-way housing through the flange.

[0011] Further preferably, a plurality of sealing rings are provided between the bus housing, the three-way housing and the spherical cover plate; a draw-off opening is provided in the middle of the bus housing, and the draw-off opening is connected to the electrical connection port of the test transformer.

[0012] Further preferably, the air filling assembly is installed on the side wall of the bus housing. After vacuum pumping through the air filling assembly, insulating gas is filled or released to perform a leak detection test or an insulation test on the 252 kV GIS outgoing bushing to be detected.

[0013] Further preferably, the test assembly includes a T-shaped conductor, a transition conductor installed in the middle of the T-shaped conductor, basins symmetrically installed at both ends of the T-shaped conductor, and an L-shaped conductor connected to the basins; A first contact is installed between the T-shaped conductor and the basin, and a second contact is installed at the other end of the L-shaped conductor; the second contact is connected to the central conductor; a transition conductor shield is installed at the connection between the T-shaped conductor and the transition conductor.

[0014] Further preferably, an insertion interface matching the T-shaped conductor is provided on the first contact, and elastic fingers are provided in the insertion interface; An insertion interface matching the 252 kV GIS outgoing line bushing to be tested is provided on the second contact, and elastic fingers are provided in the insertion interface; At least one set of mounting holes is installed on the side wall of the tee housing, and the mounting holes match the basins; the basins are vented basins.

[0015] The present invention also discloses a withstand voltage test method for a 252 kV GIS outgoing line bushing. The withstand voltage test is carried out by using the above-mentioned withstand voltage test device for a 252 kV GIS outgoing line bushing, and includes the following steps: 1) Insert two groups of 252 kV GIS outgoing line bushings to be tested into both ends of the test chamber, ensuring that the 252 kV GIS outgoing line bushings to be tested are connected to the outside of the test chamber and connected to the inside of the test assembly; 2) After evacuating the test chamber through the gas charging assembly, fill it with insulating gas; 3) Apply a standard lightning impulse voltage through a test transformer for a withstand voltage test.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a withstand voltage test device for a 252kV GIS outlet bushing. By symmetrically installing two groups of 252kV GIS outlet bushings at both ends of a test chamber, two bushing tests can be completed in one test. Compared with the traditional single test, the test efficiency is significantly improved, the test cycle is shortened, and the test cost is reduced. The test assembly is integrated inside the test chamber, which simplifies the external wiring and reduces the complexity of the test environment. The 252kV GIS outlet bushing to be tested is connected to the outside of the test chamber and to the inside of the test assembly. The test assembly is connected to the electrical connection port of the test transformer. The reliability and sealing of the electrical connection are ensured through the internal and external double connection structure, and the application of the test voltage and the collection of test data are convenient. The 252kV GIS outlet bushing to be tested is connected to the outside of the test chamber, realizing mechanical fixation and gas sealing, and is connected to the inside of the test assembly to ensure electrical conduction, forming a double reliability guarantee. The outlet bushing and the test chamber can be quickly disassembled and assembled to meet the testing requirements of bushings of different specifications, and the versatility is improved. The gas filling assembly can realize the vacuuming of the test chamber and the filling of insulating gas, providing a stable insulating environment for the withstand voltage test and ensuring the accuracy of the test results. The lightning impulse withstand voltage, switching impulse withstand voltage, power frequency voltage and other test voltages required by the standard are applied to the end of the outlet bushing to complete the withstand voltage test.

[0017] Furthermore, an opening is provided at the top of the test chamber, and a flange is provided at the opening. The 252kV GIS outlet bushing to be tested is assembled and connected to the test chamber through the flange and kept sealed. The flange connection structure is simple and reliable, easy to install and disassemble, and the sealing design ensures the airtightness of the test chamber to prevent leakage of insulating gas. Several brackets are installed under the test chamber, and the outlet bushing to be tested is connected to the test assembly in the test chamber through the bracket; the bracket provides stable support for the 252kV GIS outlet bushing to be tested, ensuring the accurate alignment and reliable connection of the outlet bushing and the test assembly, and reducing vibration and displacement during the test.

[0018] Furthermore, the 252kV GIS outlet bushing to be tested includes a central conductor and a porcelain sleeve sleeved on the surface of the central conductor; the central conductor plays the role of internal charging and current carrying, and the porcelain sleeve, as an insulating component, can effectively isolate the live part from the non-live part; the top of the bracket is fixedly connected to the porcelain sleeve, which is simple, reliable and easy to install.

[0019] Furthermore, a voltage grading ring is provided on the top of the central conductor, and the voltage grading ring is a tubular structure; a shielding assembly is provided on the central conductor sleeve; the voltage grading ring and the shielding assembly can evenly distribute the electric field strength, avoid the risk of breakdown caused by local electric field concentration, and improve the safety and reliability of the test.

[0020] Furthermore, the test chamber includes a busbar housing, tee housings installed at both ends of the busbar housing, and a spherical cover plate installed at the bottom of the tee housing; the modular design facilitates assembly and maintenance, and the spherical cover plate can effectively disperse the internal pressure, improving the structural strength and sealing performance of the test chamber.

[0021] Furthermore, multiple sealing rings are provided between the busbar housing, the tee housing, and the spherical cover plate; the multiple sealing ring design ensures the airtightness of the test chamber, prevents the leakage of insulating gas, and guarantees the stability of the test environment.

[0022] Furthermore, a tapping port is provided in the middle of the busbar housing, and the tapping port is connected to the electrical connection port of the test transformer; the tapping port design facilitates the electrical connection between the test transformer and the test chamber, simplifies the wiring of the test device, and improves the convenience of test operation.

[0023] Furthermore, the gas charging assembly is installed on the side wall of the busbar housing. After evacuating through the gas charging assembly, insulating gas is filled or released to perform a leak detection test or an insulation test on the outgoing line bushing to be detected; the gas charging assembly is integrated into the busbar housing, with a compact structure and convenient operation, and can realize integrated operations of evacuation, gas charging, and leak detection, improving the test efficiency.

[0024] Furthermore, the test assembly includes a T-shaped conductor, a transition conductor installed in the middle of the T-shaped conductor, basins symmetrically installed at both ends of the T-shaped conductor, and an L-shaped conductor connected to the basins; the symmetrical design of the T-shaped conductor and the basins ensures that two outgoing line bushings are tested simultaneously, and the connection method of the transition conductor and the L-shaped conductor is simple and reliable, facilitating installation and maintenance. A first contact is installed between the T-shaped conductor and the basin, and a second contact is installed at the other end of the L-shaped conductor; the second contact is connected to the central conductor; the contact structure ensures the stability and reliability of the electrical connection; a transition conductor shield is installed at the connection between the T-shaped conductor and the transition conductor, and the transition conductor shield can evenly distribute the electric field intensity, shield the tip at the connection, and avoid partial discharge.

[0025] Furthermore, an insertion port matching the T-shaped conductor is provided on the first contact, and elastic contact fingers are provided in the insertion port; the elastic contact finger design ensures the close contact between the contact and the conductor, forms a stable electrical connection, reduces the contact resistance, and improves the reliability of the electrical connection. An insertion port matching the outgoing line bushing to be detected is provided on the second contact, and elastic contact fingers are provided in the insertion port; the elastic contact finger design ensures the close connection between the central conductor of the outgoing line bushing and the contact, reduces the contact resistance, and improves the accuracy of the test. At least one set of mounting holes is installed on the side wall of the tee housing, and the mounting holes match the basins; the basins are vented basins; the mounting hole design facilitates the installation and fixation of the basins, and the vented basins connect all the gas chambers in the withstand voltage test into one body, which can balance the internal air pressure of the test chamber, improve the stability and safety of the test; the basins can isolate the charged part inside the busbar housing and the tee housing from the porcelain sleeve part and play a fixing role.

[0026] The present invention discloses a withstand voltage test method for 252 kV GIS outgoing line bushings. Two groups of outgoing line bushings to be tested are inserted into both ends of the test chamber, ensuring that the outgoing line bushings to be tested are connected outside the test chamber and inside the test assembly; the double-station design can test two outgoing line bushings simultaneously, significantly improving the test efficiency and shortening the test cycle. After evacuating the test chamber through the gas charging assembly, an insulating gas is filled; the evacuation and gas filling operations ensure a stable insulating environment inside the test chamber, improving the accuracy and reliability of the test results. A standard lightning impulse voltage is applied through a test transformer for the withstand voltage test; the standard lightning impulse voltage test can comprehensively evaluate the insulation performance of the outgoing line bushing, ensuring its safety and reliability during actual operation.

[0027] Furthermore, in the present invention, through the provided test chamber and test assembly, an insulating gas is filled into the test chamber to test the 252 kV GIS outgoing line bushing. The 252 kV GIS outgoing line bushing to be tested is connected inside and outside the device. The internal connection is achieved by inserting the extended part of the central conductor of the outgoing line bushing into the contact seat of the device, and good electrical contact is formed by pressing with elastic contact fingers; the external connection is achieved by connecting the transition flange of the outgoing line bushing to the flange of the tee housing of the device, and a sealing ring is used for sealing. After completing the internal and external connections, the operations of evacuating and filling the insulating gas can be carried out. After completing the gas filling operation, the test transformer can be started to apply voltage to conduct the withstand voltage test on the 252 kV GIS outgoing line bushing to be tested. The entire process tests two 252 kV GIS outgoing line bushings simultaneously, greatly improving the test efficiency of the 252 kV GIS outgoing line bushing and shortening the time required for the test of the 252 kV GIS outgoing line bushing. Description of the Drawings

[0028] Figure 1 It is a schematic diagram of the overall structure of the withstand voltage test device for 252 kV GIS outgoing line bushings disclosed by the present invention; Figure 2 It is a schematic diagram of the test chamber disclosed by the present invention; Figure 3 It is a schematic diagram of the test assembly disclosed by the present invention; Figure 4 It is a schematic diagram of the contact and elastic contact fingers disclosed by the present invention; Figure 5 It is a schematic diagram of the extraction port disclosed by the present invention.

[0029] Wherein: 1. grading ring; 2. porcelain bushing; 3. center conductor; 4. shielding assembly; 5. test cavity; 51. bus housing; 52. tee housing; 53. spherical cover plate; 6. bracket; 7. first contact; 8. second contact; 9. basin; 10. L-shaped conductor; 11. T-shaped conductor; 12. transition conductor; 13. transition conductor shield; 14. elastic finger; 15. draw hole. Detailed implementation manners

[0030] In order to enable those skilled in the art of the present technology to better understand the solution of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

[0031] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0032] The present invention will be further described in detail below in conjunction with the accompanying drawings: See Figure 1Schematic diagram of the overall structure of the withstand voltage test device for 252 kV GIS outgoing bushing disclosed by the present invention; as can be seen from the figure, the present invention discloses a withstand voltage test device for 252 kV GIS outgoing bushing, including a test chamber 5 and a test assembly disposed in the test chamber 5. One end of the 252 kV GIS outgoing bushing to be tested extends into the test chamber 5 and is connected to the test assembly, and power is taken from the electrical connection port of the test transformer through the test assembly to conduct a withstand voltage test. The 252 kV GIS outgoing bushing to be tested includes a central conductor 3 and a porcelain bushing 2 sleeved on the surface of the central conductor 3, and a grading ring 1 is further provided at the top of the central conductor 3. The top of the test chamber 5 is provided with an opening, and a flange is arranged at the opening position. The 252 kV GIS outgoing bushing to be tested is assembled and connected to the test chamber 5 through the flange and kept sealed, and the test chamber 5 is also provided with an inflation assembly. The test chamber 5 is disposed on a bracket 6, and the inside of the 252 kV GIS outgoing bushing to be tested is connected to the test assembly in the test chamber 5 through the central conductor 3 and is connected to the three-way housing 52 of the test chamber 5 through the flange, so as to conduct a withstand voltage test.

[0033] Figure 2 Schematic diagram of the test chamber disclosed by the present invention; as can be seen from the figure, the test chamber 5 includes a bus housing 51, two three-way housings 52 and two spherical covers 53. The bus housing 51, the three-way housings 52 and the spherical covers 53 are fixedly connected, and a plurality of sealing rings are provided between the bus housing 51, the three-way housings 52 and the spherical covers 53. An inflation assembly is provided on the side wall of the bus housing 51, and the inflation assembly is at least one valve. Vacuum is pumped, insulating gas is filled or released through the valve.

[0034] Figure 3 Schematic diagram of the test assembly disclosed by the present invention; Figure 4 Schematic diagram of the contact and elastic contact finger disclosed by the present invention; as can be seen from the figure, the test assembly includes two first contacts 7, two second contacts 8, two pots 9, two L-shaped conductors 10, one T-shaped conductor 11, one transition conductor 12 and one transition conductor shield 13. One end of the pot 9 is fixedly connected to the first contact 7, and the other end is fixedly connected to the L-shaped conductor 10. The second contact 8 is fixedly connected to the L-shaped conductor 10. The second contact 8 is provided with an insertion port matching the 252 kV GIS outgoing bushing to be tested, and an elastic contact finger 14 is arranged in the insertion port. The transition conductor 12 is fixedly connected to the T-shaped conductor 11, and the connection part is covered by the transition conductor shield 13 to shield the tip of the connection part. The two pots 9 are vented pots, so that all the gas chambers in the withstand voltage test are connected as a whole.

[0035] Figure 5 Schematic diagram of the extraction port disclosed by the present invention; as can be seen from the figure, an extraction port 15 is provided in the middle of the bus housing 51, and the extraction port 15 is connected to the electrical connection port of the test transformer.

[0036] The present invention also discloses a withstand voltage test method for a 252 kV GIS outgoing bushing, which uses the above-mentioned withstand voltage test device for a 252 kV GIS outgoing bushing to conduct a withstand voltage test, and includes the following steps: 1) Install this device; 2) Connect the 252 kV GIS outgoing bushing to be tested to this device both internally and externally. The internal connection is achieved by inserting the extended part of the central conductor 3 of the outgoing bushing into the contact seat of this device and relying on the elastic contact fingers 14 to press tightly to form good electrical contact; the external connection is achieved by connecting the transition flange of the outgoing bushing to the flange of the tee housing 52 of this device and using a sealing ring for sealing. After completing the internal and external connections, the operations of vacuum pumping and filling with insulating gas can be carried out; 3) After completing the gas filling operation, the test transformer can be started to apply voltage to conduct a withstand voltage test on the 252 kV GIS outgoing bushing to be tested.

[0037] The withstand voltage test device and method for a 252 kV GIS outgoing bushing disclosed by the present invention, through the double-station symmetric design, modular sealed cavity, elastic contact finger 14 connection structure and the integration of the gas filling component, realizes an efficient test mode for simultaneously testing two outgoing bushings, significantly improves the test efficiency and shortens the test cycle. The device adopts a multi-layer sealing design and insulating gas filling technology to ensure the stability and safety of the test environment. At the same time, the electric field distribution is optimized through structures such as the grading ring 1, shielding assembly 4 and transition conductor shield 13, avoiding the risk of partial discharge. The test method comprehensively evaluates the insulation performance of the outgoing bushing through vacuum pumping, gas filling and standardized withstand voltage test procedures, is easy to operate and the results are reliable, and is suitable for the rapid detection and quality verification of large-scale GIS outgoing bushings.

[0038] Embodiment 1 A voltage withstand test device for a 252 kV GIS outgoing bushing, comprising: a test chamber 5 and a test assembly installed inside the test chamber 5. Through the integrated design of the test chamber 5 and the test assembly, a complete voltage withstand test environment is provided, which can meet the high-voltage test requirements of the 252 kV GIS outgoing bushing, ensuring the comprehensiveness and accuracy of the test. Two 252 kV GIS outgoing bushings to be tested are respectively installed at both ends of the test chamber 5; a double-station symmetric design is adopted, and two bushings can be tested simultaneously, significantly improving the test efficiency, shortening the test cycle, reducing the test cost, and being applicable to batch detection scenarios. The 252 kV GIS outgoing bushing to be tested is externally connected to the test chamber 5 and internally connected to the test assembly. Through the internal and external double connection structure, the electrical connection reliability and sealing performance between the bushing and the test device are ensured, and at the same time, it is convenient for the application of the test voltage and the acquisition of test data. The test assembly is connected to the electrical connection port of the test transformer; the direct connection between the test assembly and the test transformer simplifies the wiring of the test device, improves the convenience of test operation, and at the same time ensures the stable transmission of high-voltage electric energy. An inflation assembly is arranged inside the test chamber 5, which can realize the vacuum pumping and insulating gas filling of the test chamber 5, provide a stable insulating environment for the voltage withstand test, ensure the accuracy and reliability of the test results, and at the same time support leak detection tests and insulation tests.

[0039] Embodiment 2 A voltage withstand test device for a 252 kV GIS outgoing bushing, comprising: a test chamber 5 and a test assembly installed inside the test chamber 5. Two 252 kV GIS outgoing bushings to be tested are respectively installed at both ends of the test chamber 5; the 252 kV GIS outgoing bushing to be tested is externally connected to the test chamber 5 and internally connected to the test assembly, and the test assembly is connected to the electrical connection port of the test transformer; an inflation assembly is arranged inside the test chamber 5. A double-station symmetric design is adopted, and two bushings can be tested simultaneously, significantly improving the test efficiency, shortening the test cycle, reducing the test cost, and being applicable to batch detection scenarios. Through the internal and external double connection structure, the electrical connection reliability and sealing performance between the bushing and the test device are ensured, and at the same time, it is convenient for the application of the test voltage and the acquisition of test data.

[0040] An opening is provided at the top of the test chamber 5, and a flange is arranged at the opening. The 252 kV GIS outgoing bushing to be tested is assembled and connected to the test chamber 5 through the flange and kept sealed; several supports 6 are installed below the test chamber 5, and the 252 kV GIS outgoing bushing to be tested is connected to the test assembly inside the test chamber 5 through the supports 6. The airtightness of the test chamber 5 is ensured through the sealing design to prevent the leakage of insulating gas. The supports 6 provide stable support, ensure the precise alignment and reliable connection between the bushing and the test assembly, and reduce vibration and displacement during the test.

[0041] The 252 kV GIS outgoing line bushing to be tested includes a central conductor 3 and a porcelain bushing 2 sleeved on the surface of the central conductor 3; the top of the bracket 6 is fixedly connected to the porcelain bushing 2. As an insulating component, the porcelain bushing 2 can effectively isolate the live part from the non-live part. The connection mode between the bracket 6 and the porcelain bushing 2 is simple and reliable, which is convenient for installation and adjustment.

[0042] The test chamber 5 includes a bus housing 51, three-way housings 52 installed at both ends of the bus housing 51, and a spherical cover plate 53 installed at the bottom of the three-way housing 52; the inside of the 252 kV GIS outgoing line bushing to be tested is internally connected to the test assembly through the central conductor 3, and the outside of the 252 kV GIS outgoing line bushing to be tested is externally connected to the three-way housing 52 through a flange. The modular design is convenient for assembly and maintenance. The spherical cover plate 53 can effectively disperse the internal pressure, improving the structural strength and sealing performance of the test chamber 5. The internal and external double connection mode ensures the reliability and tightness of the electrical connection, and is also convenient for applying the test voltage and collecting test data.

[0043] A plurality of sealing rings are provided between the bus housing 51, the three-way housing 52 and the spherical cover plate 53; a draw port 15 is provided in the middle of the bus housing 51, and the draw port 15 is connected to the electrical connection port of the test transformer. The multiple sealing ring design ensures the airtightness of the test chamber 5, prevents the leakage of insulating gas, and guarantees the stability of the test environment. The draw port 15 design is convenient for the electrical connection between the test transformer and the test chamber 5, simplifies the wiring of the test device, and improves the convenience of test operation.

[0044] The gas charging assembly is installed on the side wall of the bus housing 51. After evacuating through the gas charging assembly, insulating gas is filled or released to perform a leak detection test or an insulation test on the 252 kV GIS outgoing line bushing to be tested. The operation is convenient, and the integrated operation of evacuation, gas charging and leak detection can be realized, improving the test efficiency.

[0045] The test assembly includes a T-shaped conductor 11, a transition conductor 12 installed in the middle of the T-shaped conductor 11, basins 9 symmetrically installed at both ends of the T-shaped conductor 11, and an L-shaped conductor 10 connected to the basins 9; a first contact 7 is installed between the T-shaped conductor 11 and the basin 9, and a second contact 8 is installed at the other end of the L-shaped conductor 10; the second contact 8 is connected to the central conductor 3; a transition conductor shield 13 is installed at the connection between the T-shaped conductor 11 and the transition conductor 12. The contact structure ensures the stability and reliability of the electrical connection. The transition conductor shield 13 can evenly distribute the electric field intensity and avoid partial discharge. The design of the elastic contact finger 14 ensures the close contact between the contact and the conductor, ensures the close connection between the central conductor 3 of the bushing and the contact, reduces the contact resistance, improves the reliability of the electrical connection, and improves the accuracy of the test.

[0046] An insertion interface matching the T-shaped conductor 11 is provided on the first contact 7, and elastic fingers 14 are provided inside the insertion interface; an insertion interface matching the 252 kV GIS outgoing bushing to be tested is provided on the second contact 8, and elastic fingers 14 are provided inside the insertion interface; at least one set of mounting holes is installed on the side wall of the tee housing 52, and the mounting holes match the basin 9; the basin 9 is a vented basin. The design of the mounting holes facilitates the installation and fixation of the basin 9, and the vented basin can balance the internal air pressure of the test chamber 5, improving the stability and safety of the test.

[0047] A grading ring 1 is provided at the top of the center conductor 3, and the grading ring 1 is of a tubular structure; a shielding assembly 4 is sleeved on the center conductor 3. The grading ring 1 and the shielding assembly 4 can evenly distribute the electric field intensity, avoid the breakdown risk caused by local electric field concentration, and improve the safety and reliability of the test.

[0048] Embodiment 3 A withstand voltage test device for a 252 kV GIS outgoing bushing includes: a test chamber 5 and a test assembly provided in the test chamber 5, and one end of the 252 kV GIS outgoing bushing to be tested extends into the test chamber 5 and is connected to the test assembly; an opening is provided at the top of the test chamber 5, and a flange is provided at the opening position. The 252 kV GIS outgoing bushing to be tested is assembled and connected to the test chamber 5 through the flange and kept sealed, and the test chamber 5 is also provided with an inflation assembly. In this embodiment, the 252 kV GIS outgoing bushing to be tested includes a center conductor 3 and a porcelain bushing 2 sleeved on the surface of the center conductor 3. A grading ring 1 is also provided at the top of the center conductor 3, where the grading ring 1 is of a tubular structure with a diameter of 600 mm. The porcelain bushing 2 can isolate the internal energized part from the non-energized part, with a height of 2400 mm, preferably made of ceramics. The center conductor 3 plays the role of internal energization and current carrying, preferably made of 6063-T6 aluminum alloy with strong current carrying capacity. There is also a shielding assembly 4 sleeved on the center conductor 3, which plays the role of equalizing the internal field strength. It also includes a bracket 6, the test chamber 5 is arranged on the bracket 6, and the 252 kV GIS outgoing bushing to be tested is connected to the test assembly in the test chamber 5 through the bracket 6.

[0049] The bracket 6 provided in this embodiment is used to support the 252 kV GIS outgoing bushing to be tested. The top of the bracket 6 is fixedly connected to the porcelain bushing 2 of the 252 kV GIS outgoing bushing to be tested through a matching flange and bolt. The central conductor 3 of the 252 kV GIS outgoing bushing to be tested extends into the test chamber 5 and is connected to the test assembly. The test assembly includes a first contact 7, a second contact 8, a basin 9, an L-shaped conductor 10, a T-shaped conductor 11, a transition conductor 12, and a transition conductor shield 13. One end of the basin 9 is fixedly connected to the first contact 7, and the other end is fixedly connected to the L-shaped conductor 10. The L-shaped conductor 10 is fixedly connected to the second contact 8. The first contact 7 is provided with an insertion interface matching the T-shaped conductor 11, and elastic contact fingers 14 are provided in the insertion interface; the second contact 8 is provided with an insertion interface matching the 252 kV GIS outgoing bushing to be tested, and elastic contact fingers 14 are provided in the insertion interface; the middle necking 15 of the test chamber 5 is electrically connected to the test transformer.

[0050] As Figure 2 , Figure 3 and Figure 4 shown, in this embodiment, the second contact 8 is used to connect to the central conductor 3, and there are two first contacts 7 in total. They are symmetrically distributed, and a plurality of elastic contact fingers 14 are provided at both ends of the provided insertion interface, and a stable electrical connection is formed with the T-shaped conductor 11 through the elastic contact fingers 14; in this embodiment, the basin 9 can isolate the energized parts inside the bus housing 51 and the tee housing 52 from the porcelain bushing 2 part and play a fixing role. As Figure 2 shown, one end of the basin 9 is connected to the tee housing 52 through a sealing ring, and the other end is connected to the bus housing 51 through a sealing ring; the center of one side of the basin 9 is fixedly connected to the first contact 7, and the insertion interface of the first contact 7 is connected to the T-shaped conductor 11. The transition conductor shield 13 in this embodiment covers the connection part of the transition conductor 12 and the T-shaped conductor 11, equalizes the field strength at the pointed part, and enables the withstand voltage test to be successfully completed without causing local breakdown.

[0051] The test chamber 5 includes a bus housing 51, a tee housing 52, and a spherical cover plate 53. The bus housing 51, the tee housing 52, and the spherical cover plate 53 are fixedly connected, and a plurality of sealing rings are provided between the bus housing 51, the tee housing 52, and the spherical cover plate 53. As in this embodiment Figure 2 shown, the bus housing 51, the tee housing 52, and the spherical cover plate 53 are fixedly connected in sequence through flanges, and the flanges are connected by bolts. A sealed chamber is formed between the cavities of the entire test chamber 5. The provided sealing rings can play a better sealing role. The central conductor 3 of the outgoing bushing is connected to the sealed chamber, and an insulating gas is introduced into the sealed chamber to perform a withstand voltage test on the outgoing bushing.

[0052] At least one set of mounting holes is installed on the side wall of the tee housing 52, and the mounting holes are matched with the basin 9. In this embodiment, the mounting holes selected are those adapted to the basin 9 with a pitch circle diameter of 434 mm.

[0053] An inflation assembly is provided on the side wall of the bus housing 51, and the inflation assembly is at least one valve. The valve fills or discharges insulating gas. The provided valve can fill or discharge insulating gas to perform a leak detection test or an insulation test on the 252 kV GIS outgoing bushing to be tested. The insulating gas is preferably SF6 gas.

[0054] When installing this device, first install the first contact 7 onto Figure 1 the left basin 9, and then insert the elastic finger 14 into the first contact 7. Next, install the L-shaped conductor 10 onto Figure 1 the left basin 9 in the direction shown. Then Figure 1 the left tee housing 52 of Figure 1 the left basin 9, and the bus housing 51 are connected by bolts and sealing rings. Insert the T-shaped conductor 11 through the bus housing 51 and into Figure 1 the first contact 7 in the left basin 9 of

[0055] After installing the outgoing bushing and this device, first evacuate the air, and then fill it with insulating gas at the operating pressure required for the test (0.4 MPa - 0.5 MPa) through the valve. Apply various test voltages such as the lightning impulse withstand voltage, switching impulse withstand voltage, and power frequency voltage required by the standard at the end of the outgoing bushing to complete the withstand voltage test.

[0056] A withstand voltage test device and method for a 252 kV GIS outgoing bushing disclosed by the present invention can perform a withstand voltage test on a 252 kV GIS outgoing bushing. When testing, it can test two outgoing bushings at a time, ensuring reliable and stable test results and improving the test efficiency at the same time. Through the provided test chamber 5 and test components, the device fills the test chamber 5 with insulating gas to test the 252 kV GIS outgoing bushing. The 252 kV GIS outgoing bushing to be detected is internally and externally connected to the device. The internal connection is achieved by inserting the extended part of the central conductor 3 of the outgoing bushing into the contact seat of the device and relying on the elastic contact finger 14 to press tightly to form good electrical contact. The external connection is achieved by connecting the transition flange of the outgoing bushing to the flange of the tee housing 52 of the device and using a sealing ring for sealing. After completing the internal and external connections, the operations of vacuum pumping and filling with insulating gas can be carried out. After completing the gas filling operation, the test transformer can be started to apply voltage to perform a withstand voltage test on the 252 kV GIS outgoing bushing to be detected. During the whole process, two 252 kV GIS outgoing bushings are tested simultaneously, greatly improving the test efficiency of the 252 kV GIS outgoing bushing and shortening the time required for the test of the 252 kV GIS outgoing bushing.

[0057] The above content is only to illustrate the technical idea of the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention fall within the protection scope of the claims of the present invention.

Claims

1. A 252kV GIS outlet bushing withstand voltage test device, characterized in that: include: A test chamber (5) and a test assembly installed inside the test chamber (5); two groups of 252 kV GIS outlet bushings to be tested are respectively installed at two ends of the test chamber (5); the 252 kV GIS outlet bushings to be tested are connected to the outside of the test chamber (5) and to the inside of the test assembly; the test assembly is connected to the electrical connection port of the test transformer; and an air filling assembly is arranged inside the test chamber (5).

2. The 252kV GIS outlet bushing withstand voltage test device according to claim 1, characterized in that: The test chamber (5) is provided with an opening at the top, and a flange is provided at the opening. The 252 kV GIS outlet bushing to be tested is assembled and connected to the test chamber (5) through the flange and maintained sealed; A plurality of brackets (6) are installed below the test chamber (5), and the 252 kV GIS outlet bushing to be tested is connected to the test assembly in the test chamber (5) via the brackets (6).

3. The 252kV GIS outlet bushing withstand voltage test device according to claim 2, characterized in that: The 252 kV GIS outlet bushing to be tested comprises a central conductor (3) and a porcelain bushing (2) sleeved on the surface of the central conductor (3); the top of the bracket (6) is fixedly connected to the porcelain bushing (2).

4. The 252kV GIS outlet bushing withstand voltage test device according to claim 3, characterized in that: A voltage equalizing ring (1) is provided on the top of the central conductor (3), and the voltage equalizing ring (1) is a tubular structure; and a shielding assembly (4) is sleeved on the central conductor (3).

5. The 252kV GIS outlet bushing withstand voltage test device according to claim 3, characterized in that: The test chamber (5) comprises a busbar housing (51), a three-way housing (52) installed at both ends of the busbar housing (51), and a spherical cover plate (53) installed at the bottom of the three-way housing (52); The inside of the 252 kV GIS outlet bushing to be tested is connected to the inside of the test assembly via a central conductor (3), and the outside of the 252 kV GIS outlet bushing to be tested is connected to the outside of the tee housing (52) via a flange.

6. The 252kV GIS outlet bushing withstand voltage test device according to claim 5, characterized in that: A plurality of sealing rings are provided between the busbar housing (51), the three-way housing (52) and the spherical cover plate (53); a pull-out opening (15) is provided in the middle of the busbar housing (51), and the pull-out opening (15) is connected to the electrical connection port of the test transformer.

7. The 252kV GIS outlet bushing withstand voltage test device according to claim 5, characterized in that: The gas filling component is mounted on the side wall of the busbar housing (51), and after the gas filling component is evacuated, insulating gas is filled in or released to perform a leakage test or insulation test on the 252 kV GIS outlet bushing to be tested.

8. The 252kV GIS outlet bushing withstand voltage test device according to claim 5, characterized in that: The test assembly comprises a T-shaped conductor (11), a transition conductor (12) installed in the middle of the T-shaped conductor (11), a pot (9) symmetrically installed at both ends of the T-shaped conductor (11), and an L-shaped conductor (10) connected to the pot (9); A first contact (7) is installed between the T-shaped conductor (11) and the basin (9), and a second contact (8) is installed at the other end of the L-shaped conductor (10); the second contact (8) is connected to the center conductor (3); and a transition conductor shield (13) is installed at the connection between the T-shaped conductor (11) and the transition conductor (12).

9. The 252kV GIS outlet bushing withstand voltage test device according to claim 8, characterized in that: The first contact (7) is provided with a plug-in interface that matches the T-shaped conductor (11), and a resilient contact finger (14) is provided in the plug-in interface; The second contact (8) is provided with a plug interface that matches the 252 kV GIS outlet bushing to be tested, and a resilient contact finger (14) is provided in the plug interface; The side wall of the three-way housing (52) is provided with at least one group of mounting holes, and the mounting holes match the basin (9); the basin (9) is a ventilated basin.

10. A withstand voltage test method for 252kV GIS outlet bushing, characterized in that: A withstand voltage test is performed using the 252kV GIS outlet bushing withstand voltage test device as described in any one of claims 1 to 9, comprising the following steps: 1) Insert two sets of 252kV GIS outlet bushings to be tested into both ends of the test chamber (5), ensuring that the 252kV GIS outlet bushings to be tested are connected to the outside of the test chamber (5) and to the inside of the test assembly; 2) After the test chamber (5) is evacuated by means of the gas filling assembly, it is filled with insulating gas; 3) Perform voltage withstand test by applying standard lightning impulse voltage through the test transformer.

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