A quick grounding switch test platform with magnetic blowout arc device and method

Abstract

The application discloses a kind of quick grounding switch test platform and method with magnetic blowout arc device, including tank, basin type insulator, movable contact and fixed contact assembly, operating mechanism, protective straight cylinder and magnetic blowout arc unit.The tank is steel sealed pressure-bearing pressure vessel, and is the bearing matrix of integral test platform, and observation window is symmetrically arranged on the front and back sides of the tank, and high-strength tempered glass is fixedly embedded in the observation window;A pressure relief window is reserved in the lower part of the tank, and an explosion-proof film is sealed and assembled outside the pressure relief window to form a passive pressure relief safety structure;The tank is a sealed cavity structure.The basin type insulator is fixedly embedded in the central position inside the tank and is sealingly fixed to the inner wall of the tank as an insulating support matrix.The application relates to the technical field of high-voltage switch testing, and specifically provides a quick grounding switch test platform and method with magnetic blowout arc device.

Description

Technical Field

[0001] This invention relates to the field of high-voltage switch testing technology, specifically to a fast grounding switch testing platform and method with a magnetic blowout arc extinguishing device. Background Technology

[0002] Fast grounding switch: It is the core protective grounding element of high voltage transmission lines and GIS high voltage switchgear. Its core function is to interrupt the electromagnetic induction current and electrostatic induction current of the power grid. Its performance directly determines the stability of the power grid operation and the insulation safety of high voltage equipment.

[0003] With the continuous expansion of high-voltage transmission networks and the widespread adoption of new environmentally friendly electrical equipment, environmentally friendly magnetic blowout fast grounding switches have become the mainstream of industry research and development. Currently, most conventional fast grounding switch test platforms in the industry are fixed, integrated structures. These devices typically only simulate single gas medium conditions and cannot fully meet the research and performance evaluation needs of new switches under the trend of environmentally friendly gas substitution. Existing equipment has fixed functions and contact spacing, making it difficult to adjust and flexibly test switches with different structural parameters. More importantly, for the emerging magnetic blowout arc extinguishing technology, existing test platforms cannot simulate or adjust key parameters such as magnet placement and magnetic field strength, resulting in an inability to systematically verify and optimize the arc extinguishing effect of the magnetic blowout structure. Traditional test methods generally suffer from low parameter adjustment accuracy, poor data repeatability, and a lack of visual observation methods for the dynamic process of the arc, making it difficult to meet the needs of in-depth mechanism research and engineering applications of environmentally friendly magnetic blowout fast grounding switches. Summary of the Invention

[0004] The technical problem this invention aims to solve is that existing fast grounding switch test platform equipment has limited functionality, poor structural adjustability, cannot flexibly simulate various gas and magnetic blow-out working conditions, and is difficult to support special test research on environmentally friendly magnetic blow-out fast grounding switches.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: The present solution provides a fast grounding switch test platform with a magnetic blowout arc extinguishing device, including a tank, a basin-type insulator, a moving and stationary contact assembly, an operating mechanism, a protective cylinder, and a magnetic blowout arc extinguishing unit.

[0006] The tank is a steel sealed pressure vessel, which serves as the load-bearing base of the overall test platform. The tank has its own inflation and deflation ports. At least two observation windows are provided on the front and rear sides of the tank, and high-strength tempered glass is fixedly embedded inside the observation windows. A pressure relief window is reserved at the bottom of the tank, and an explosion-proof membrane is sealed on the outside of the pressure relief window to form a passive pressure relief safety structure. The tank is a closed cavity structure.

[0007] The basin-type insulator is fixedly embedded in the center of the tank and sealed to the inner wall of the tank, serving as an insulating support base.

[0008] The moving and stationary contact assembly includes a stationary contact and a moving contact that are matched together. The stationary contact is fixedly installed on one end face of the basin-type insulator, and the moving contact is coaxially and correspondingly arranged with the stationary contact. The power input end of the moving contact is connected to the output shaft of the operating mechanism.

[0009] The operating mechanism is a spring-operated mechanism, and the operating mechanism and the tank are adapted and installed through a detachable transition flange; a displacement sensor is linked to the output end of the operating mechanism.

[0010] The protective straight cylinder is coaxially fitted outside the stationary contact, and its end is fixedly connected to the inside of the tank, covering the moving area of ​​the moving contact and isolating it from arc erosion and high-speed airflow impact.

[0011] The magnetic blowout arc extinguishing unit is a modular and detachable structure, comprising a mounting support, a magnet, a stopcock, and a housing fixing block. The mounting support has an axially through-hole, and a stopcock is threaded to the bottom of the hole. The magnet is embedded in the cavity formed between the hole and the stopcock, and the magnet is sealed inside the support. The stopcock has a tightening hole and a vent hole on its end face, and the vent hole connects the inner and outer cavities of the support. The mounting support is threaded onto the housing fixing block inside the tank. Fastening holes are provided on the side wall of the support.

[0012] The magnetic blowout arc extinguishing unit can be flexibly arranged in a single-group single-sided arrangement or a double-group symmetrical arrangement. When arranged in a double-group arrangement, it is symmetrically installed on the left and right sides of the moving and stationary contact assembly.

[0013] Preferred technical solution 1: The test medium gas adapted to the tank includes any one of SF6 gas, air, C4 / CO2 binary gas mixture, and C4 / CO2 / O2 ternary gas mixture.

[0014] Preferred technical solution 2: The multiple observation windows are arranged along the axial and radial directions of the tank body.

[0015] Preferred technical solution 3: The displacement sensor is selected from optical grating rulers or wire-type displacement sensors.

[0016] Preferred technical solution four: The mounting support is made of polytetrafluoroethylene rod or epoxy-impregnated glass cloth. The bottom of the inner hole of the mounting support is machined with an M16 standard internal thread, and the outer wall of the plug is machined with a matching external thread. The two are precisely screwed together to achieve stepless continuous adjustment of the magnet installation height.

[0017] Preferred technical solution five: The protective cylinder is made of insulating and high-temperature resistant material.

[0018] The present invention proposes a test method for a fast grounding switch test platform with a magnetic blowout arc extinguishing device, comprising the following steps:

[0019] S1: Inflate the tank with air through its built-in air inlet and outlet and adjust it to the rated test pressure, then let it stand still to stabilize the pressure;

[0020] S2. Replace the adapter flange, adjust the contact gap to the target value, and assemble and calibrate the displacement sensor.

[0021] S3. Select one or two sets of magnetic blowout arc extinguishing units for assembly. Adjust the stopcock to adjust the magnet to the preset height and then lock it in place.

[0022] S4. Seal the tank and complete the airtightness check; set up a high-speed camera and complete the synchronous calibration of shooting parameters and trigger signals.

[0023] S5. Drive the operating mechanism to complete the opening action, carry out the Class B electromagnetic induction current interruption test, and simultaneously collect arc dynamic images and switch stroke characteristic data.

[0024] S6. Organize and analyze the test data, and evaluate the magnetic blowout arc extinguishing effect and switch breaking performance under different working conditions.

[0025] The present invention proposes a fast grounding switch test platform and method with a magnetic blowout arc extinguishing device. The beneficial effects achieved by adopting the above structure are as follows:

[0026] (1) Compatible with multiple environmentally friendly gases: The test platform is compatible with multiple gas media environments such as SF6 gas, air, C4 / CO2 binary gas mixture or C4 / CO2 / O2 ternary gas mixture, and is fully adapted to the research and development and performance testing needs of environmentally friendly insulation and arc extinguishing gas switches.

[0027] (2) The contact gap is precisely adjustable: With the help of the transition flange adapter structure, the contact gap can be flexibly adjusted, which can be adapted to the experimental research of fast grounding switches with different structural specifications.

[0028] (3) Magnetic blowout parameters can be flexibly configured: the magnetic blowout arc extinguishing unit supports two arrangement forms: single group / symmetrical double group. The magnet installation height can be adjusted in multiple levels and steplessly. It can simulate low, medium and high magnetic blowout working conditions and carry out research on the magnetic blowout assisted arc extinguishing mechanism and structural parameter optimization of the entire switching stroke.

[0029] (4) Visual observation of the entire arc process: The multi-directional observation window of the tank, combined with the high-speed camera system, can clearly capture the evolution of the arc shape, the motion law and the entire process of the contact action, providing intuitive experimental basis for arc extinguishing mechanism analysis and performance evaluation.

[0030] (5) High safety redundancy of the test: The combination of pressure relief window and explosion-proof membrane is configured as a safety pressure relief structure, which can quickly relieve pressure when there is abnormal overpressure in the tank, effectively ensuring the safety of test equipment and personnel operation.

[0031] (6) Modular and easy-to-disassemble structure: The magnetic blowout arc extinguishing unit adopts an independent installation support modular design, which is convenient to disassemble and replace. It can flexibly replace supports of different materials and magnets of different specifications, thus expanding the scope of experimental research. Attached Figure Description

[0032] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0033] Figure 1 This is a schematic diagram of the overall structure of a fast grounding switch test platform with a magnetic blowout arc extinguishing device proposed in this invention;

[0034] Figure 2 This is a cross-sectional view of the mounting support of the magnetic blowout extinguishing unit of a fast grounding switch test platform with a magnetic blowout extinguishing device proposed in this invention.

[0035] Figure 3 This is a schematic diagram of the rotary valve structure of a fast grounding switch test platform with a magnetic blowout arc extinguishing device proposed in this invention.

[0036] Among them, 1. Tank body, 2. Basin insulator, 3. Stationary contact, 4. Moving contact, 5. Operating mechanism, 6. Protective cylinder, 7. Magnetic blowout arc extinguishing unit, 8. Observation window, 9. Pressure relief window, 10. Explosion-proof membrane, 11. Transition flange, 12. Displacement sensor.

[0037] 71. Mounting support; 72. Magnet; 73. Plug; 74. Tightening hole; 75. Vent hole; 76. Fastening hole; 77. Housing fixing block. Detailed Implementation

[0038] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all 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.

[0039] It should be noted that the terms “front,” “back,” “left,” “right,” “up,” and “down” used in the following description refer to the directions shown in the attached diagram, while the terms “inside” and “outside” refer to the directions toward or away from the geometric center of a specific component, respectively. Example 1

[0040] like Figure 1As shown, a test platform for a fast grounding switch with a magnetic blowout arc extinguishing device includes a tank 1, a basin-type insulator 2, a stationary contact 3, a moving contact 4, an operating mechanism 5, a protective cylinder 6, and a magnetic blowout arc extinguishing unit 7. The tank 1 adopts a steel sealed pressure vessel structure. At least two observation windows 8 are provided on the front and rear sides of the tank 1. High-strength tempered glass is fixedly embedded inside each observation window 8. The observation windows 8 are arranged along the axial and radial directions of the tank 1. A high-speed camera is mounted on the outside of one observation window 8, and the other observation window 8 provides an observation light source to the high-speed camera equipment. A pressure relief window 9 is provided at the bottom of the tank, and an explosion-proof membrane 10 is installed on its surface. The basin-type insulator 2 is fixedly installed in the middle of the inner cavity of the tank 1. The stationary contact 3 is fixed to one side of the basin-type insulator 2, and the moving contact 4 is connected to the operating mechanism 5. The operating mechanism 5 is a spring-operated mechanism. The installation reference position can be adjusted by installing the transition flange 11, thereby achieving precise adjustment of the contact gap. The displacement sensor 12 is installed at the output end of the operating mechanism 5 to collect the switch action stroke-time curve in real time. The protective cylinder 6 is coaxially mounted on the outside of the stationary contact 3, which plays a role in guiding airflow and internal protection.

[0041] like Figures 2-3 As shown, the mounting support 71 of the magnetic blowout arc extinguishing unit 7 is integrally machined from a polytetrafluoroethylene rod. An inner hole is axially formed inside the support, with an M16 internal thread machined at the bottom. A cylindrical magnet 72 with a diameter of 30mm is inserted into the inner hole cavity. A stopcock 73 is assembled by screwing its external thread into its internal thread, sealing and pressing the magnet 72 to a limited position. The stopcock 73 is provided with a tightening hole 74 and a vent hole 75. The tightening hole facilitates tightening with a special tool, while the vent hole balances the pressure difference between the inside and outside of the mounting support 71. An M10 external thread is machined at the end of the mounting support 71, which is threadedly locked into the housing fixing block 77. A fastening hole 76 is formed on the side wall of the support, and a locking screw is used to achieve circumferential anti-rotation and axial positioning of the mounting support 71. By rotating the stopcock 73 in the forward or reverse direction, the axial installation position of the magnet 72 inside the mounting post 71 can be precisely changed, realizing low, medium and high typical positions and continuous height adjustment. This ensures that the magnetic field can effectively cover the contact gap area throughout the entire stroke of the switch from the start to the end of the opening, stably driving the arc movement to improve the arc extinguishing capability. Example 2

[0042] Based on Example 1, such as Figures 1-3 As shown, when it is necessary to strengthen the magnetic field or form a double-sided symmetrical arc-extinguishing magnetic field, two sets of magnetic arc-extinguishing units 7 can be symmetrically arranged on the left and right sides of the contact assembly. The installation height of the magnet 72 of each set of magnetic arc-extinguishing units 7 can be adjusted independently to adapt to different contact opening distances and airflow distribution conditions inside the tank 1.

[0043] A test method for a fast grounding switch test platform with a magnetic blowout arc extinguishing device includes the following steps:

[0044] S1: Select the test gas according to the preset test conditions, fill the tank with gas through the built-in gas filling and exhaust port and adjust it to the rated test pressure, and let it stand to stabilize the pressure.

[0045] S2. Replace the adapter flange 11, adjust the contact gap to the target value, and assemble and calibrate the displacement sensor 12.

[0046] S3. Select one or two sets of magnetic blowout arc extinguishing unit 7 for assembly. Adjust the plug 73 to adjust the magnet 72 to the preset height and then lock it in place.

[0047] S4. Close the sealed tank 1 and complete the airtightness check. Set up the high-speed camera and complete the synchronous calibration of shooting parameters and trigger signals.

[0048] S5 drives the operating mechanism 5 to complete the opening action, conducts a Class B electromagnetic induction current interruption test, and simultaneously collects arc dynamic images and switch stroke characteristic data.

[0049] S6. Organize and analyze high-speed camera arc images and stroke characteristic test data, and comprehensively evaluate the magnetic blowout arc extinguishing effect and induced current breaking performance under different magnetic blowout positions, gas media and opening distances.

[0050] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, material, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, material, or apparatus.

[0051] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A test platform for a fast grounding switch with a magnetic blowout arc extinguishing device, characterized in that, It includes a tank body (1), a basin-type insulator (2), a moving and stationary contact assembly, an operating mechanism (5), a protective cylinder (6), and a magnetic blowout arc extinguishing unit (7); The tank (1) is a steel sealed pressure vessel. At least two observation windows (8) are provided on the front and rear sides of the tank (1). High-strength tempered glass is fixedly embedded inside the observation windows (8). A pressure relief window (9) is reserved at the bottom of the tank (1). An explosion-proof membrane (10) is sealed on the outside of the pressure relief window (9). The tank (1) is a closed cavity structure. The basin-type insulator (2) is fixedly embedded in the center of the tank (1) and sealed to the inner wall of the tank (1) to serve as an insulating support base. The moving and stationary contact assembly includes a stationary contact (3) and a moving contact (4) that are matched together. The stationary contact (3) is fixedly installed on one end face of the basin insulator (2). The moving contact (4) is coaxially corresponding to the stationary contact (3). The power input end of the moving contact (4) is connected to the output shaft of the operating mechanism (5) for transmission. The operating mechanism (5) adopts a spring operating mechanism. The operating mechanism (5) and the tank (1) are adapted and installed through a detachable transition flange (11). The output end of the operating mechanism (5) is linked to the displacement sensor (12). The protective straight cylinder (6) is coaxially fitted outside the stationary contact (3), and its end is fixedly connected to the inside of the tank (1), covering the moving area of ​​the moving contact (4); The magnetic blowout arc extinguishing unit (7) is a modular and detachable structure, including a mounting support (71), a magnet (72), a stopcock (73), and a housing fixing block (77). The mounting support (71) has an axially through-hole, and the bottom of the hole is connected to the stopcock (73) by a thread. The cavity formed between the hole and the stopcock (73) is fitted with a magnet (72). The end face of the stopcock (73) has a tightening hole (74) and a vent hole (75). The vent hole (75) connects the inner and outer cavities of the support. The top of the mounting support (71) is threaded onto the housing fixing block (77) inside the tank (1). The side wall of the support has a fastening hole (76). The magnetic blowout arc extinguishing unit (7) can be arranged in a single group on one side or in a double group symmetrical arrangement. When arranged in a double group, it is symmetrically installed on the left and right sides of the moving and stationary contact assembly.

2. The fast grounding switch test platform with magnetic blowout arc extinguishing device according to claim 1, characterized in that, The test medium gas that the tank (1) is compatible with includes any one of SF6 gas, air, C4 / CO2 binary gas mixture, and C4 / CO2 / O2 ternary gas mixture.

3. The fast grounding switch test platform with magnetic blowout arc extinguishing device according to claim 1, characterized in that, Multiple observation windows (8) are arranged along the axial and radial directions of the tank body (1).

4. The fast grounding switch test platform with magnetic blowout arc extinguishing device according to claim 1, characterized in that, The displacement sensor (12) is selected from optical grating rulers or wire-type displacement sensors.

5. A fast grounding switch test platform with a magnetic blowout arc extinguishing device according to claim 1, characterized in that, The protective cylinder (6) is made of insulating and high-temperature resistant material.

6. A test method for a fast grounding switch test platform with a magnetic blowout arc extinguishing device according to any one of claims 1 to 5, characterized in that, Specifically, the following steps are included: S1: Select the test gas according to the preset test conditions, fill the tank (1) with gas through the gas filling and exhaust port and adjust it to the rated test pressure, and let it stand to stabilize the pressure; S2. Replace the adapter flange (11), adjust the contact gap to the target value, and assemble and calibrate the displacement sensor (12). S3. Select a single or double magnetic blowout arc extinguishing unit (7) for assembly, adjust the stopcock (73) to adjust the magnet (72) to the preset height and then lock it in place; S4. Close the sealed tank (1) and complete the airtightness check, set up the high-speed camera and complete the synchronous calibration of shooting parameters and trigger signals; S5, drive the operating mechanism (5) to complete the opening action, carry out the Class B electromagnetic induction current breaking test, and simultaneously collect arc dynamic images and switch stroke characteristic data; S6. Organize and analyze high-speed camera arc images and stroke characteristic test data, and comprehensively evaluate the magnetic blowout arc extinguishing effect and induced current breaking performance under different magnetic blowout positions, gas media and opening distances.

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