An intelligent switching device for GIS / GIL insulation test

Abstract

The invention relates to the technical field of intelligent switching devices, and proposes an intelligent switching device for GIS / GIL insulation testing. The product only needs to be connected to the equipment once for power frequency withstand voltage and lightning impulse withstand voltage tests, and the switching work is directly performed in the intelligent switching device. The operation mode is simpler, a large amount of test time is saved, the risk of foreign matter generated during the assembly process is reduced, and the floor space is reduced. The intelligent switching device comprises power frequency withstand voltage equipment, lightning impulse withstand voltage equipment and a transfer switching system. The power frequency withstand voltage equipment and the lightning impulse withstand voltage equipment are both provided with connecting flanges. The transfer switching system comprises an external four-way shell, an external connecting shell and two external connecting shells. The right end of the external four-way shell is connected with a bellows, and the two external connecting shells are respectively connected with the left end of the external four-way shell and the right end of the bellows. The two external connecting shells are respectively connected with two connecting flanges, and external connecting contact seats are provided in the two external connecting shells.

Description

Technical Field

[0001] The invention relates to the technical field of intelligent switching devices, and in particular to an intelligent switching device for GIS / GIL insulation testing. Background Art

[0002] As is known to all, GIS is gas insulated switchgear, GIL is gas insulated metal enclosed transmission line, insulation test is a test to check the dielectric strength of insulating materials or insulating structures of electrical equipment. In order to ensure the safety and efficiency of GIS / GIL during the test, the present invention proposes an intelligent switching device for GIS / GIL insulation test.

[0003] GIS / GIL is widely used in distribution systems, transmission systems, factories and enterprises. In addition to the normal voltage, GIS / GIL also needs to withstand overvoltage during normal operation. According to the requirements of the national standards GBT7674-2020 "Gas-insulated Metal-enclosed Switchgear with Rated Voltage of 72.5kV and Above" and GB / T 22383-2017 "Rigid Gas-Insulated Transmission Lines with Rated Voltage of 72.5kV and Above", GIS / GIL should be subjected to insulation tests before leaving the factory to ensure reliability. The most important of these are the power frequency withstand voltage test and the lightning impulse withstand voltage test. During the power frequency withstand voltage test and the lightning impulse withstand voltage test, the two devices need to be connected in sequence. For example, first connect to the power frequency withstand voltage equipment, evacuate the gas chamber and inject insulating gas. After the test, it is necessary to recover the insulating gas inside the connected equipment, then disconnect it from the corresponding power frequency withstand voltage equipment, and then reconnect it to the lightning impulse withstand voltage equipment. After evacuation, inject insulating gas before the second round of tests can be carried out.

[0004] The factory insulation test of GIS / GIL generally adopts the method of directly connecting the factory product with the pressure-resistant equipment flange for pressure resistance test. After the GIS / GIL product is connected to the equipment tooling interface, insulating gas is injected, and then the test is carried out. After completing one test, it is first dismantled and then connected to another device for a second test. Such operation is not only inefficient but also has a long test cycle. The two disassembly and vacuum gas injection operations are also prone to the risk of foreign matter mixing. The existing layout of power frequency pressure-resistant equipment and lightning impulse pressure-resistant equipment needs to reserve two test ports connected to the product, which also means that sufficient product assembly space is required. GIL products are generally long, which also causes a huge problem of test space. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides an intelligent switching device for GIS / GIL insulation testing, which adopts a method of newly setting up a separate air chamber, first connecting the power frequency withstand voltage equipment and the lightning impulse withstand voltage equipment, and then connecting with the product, replacing the original method of connecting the product separately to the power frequency withstand voltage equipment or the lightning impulse withstand voltage equipment. The product only needs to be connected to the equipment once for the power frequency withstand voltage and lightning impulse withstand voltage tests, and the switching work is directly performed in the intelligent switching device. The operation mode is simpler, saving a lot of test time, and reducing the risk of foreign matter generated during the assembly process. In addition, since the ports connecting the power frequency withstand voltage equipment and the lightning impulse withstand voltage equipment are changed from the original two ports for external connection to one port, the assembly space of a product that needs to be connected is saved, the floor space is reduced, and the problems of repeated disassembly, low efficiency and large floor space are solved as a whole.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an intelligent switching device for GIS / GIL insulation test, including power frequency withstand voltage equipment and lightning impulse withstand voltage equipment, and also including a transfer switching system, the power frequency withstand voltage equipment and the lightning impulse withstand voltage equipment are both provided with connecting flanges, the transfer switching system includes an external four-way shell, an external connecting shell and two external connecting shells, the right end of the external four-way shell is connected with a bellows, which is convenient for position adjustment of each shell assembly process and absorption of production and assembly errors, the two external connecting shells are respectively connected with the left end of the external four-way shell and the right end of the bellows, and the two external connecting shells are respectively connected with the two connecting methods Lan connection, external connection contact seats are arranged in the two external connecting shells, the two external connection contact seats are respectively fixedly connected with the power frequency withstand voltage equipment and the lightning impulse withstand voltage equipment, the two external connecting shells are respectively installed with grounding structures, the two grounding structures are respectively equipped with electromagnetic driven elastic structures, the two electromagnetic driven elastic structures are respectively installed on the two external connecting shells, the two grounding structures are respectively matched with the two external connection contact seats, the top end of the external four-way shell is connected with the bottom end of the external connection shell, and a pot insulator is installed between the external four-way shell and the external connection shell, and a switching switch is installed in the external four-way shell, and the switching switch is matched with the pot insulator and the two external connection contact seats.

[0007] Preferably, the switching switch includes an inner connecting contact seat and a moving contact, the inner connecting contact seat is fixedly connected to the outer four-way housing, a connecting conductor is connected to the inner connecting contact seat by welding, the connecting conductor matches the basin-type insulator, the moving contact is inserted into the inner connecting contact seat as a moving part, and a contact finger is placed between the inner connecting contact seat and the moving contact for sliding and conduction, round contacts are provided at both ends of the moving contact, the two round contacts are respectively matched with the two outer connecting contact seats, the inner connecting contact seat is equipped with an insulating control assembly, and the insulating control assembly is installed in the outer four-way housing.

[0008] Preferably, the insulating control assembly includes a rack and an insulating pull rod, a limit mounting groove is machined at the middle position of the moving contact, the rack is fixedly connected in the limit mounting groove, the insulating pull rod is rotatably matched with a bottom cover, the bottom cover is fixedly connected to the bottom end of the external four-way shell, the insulating pull rod is fixedly connected with a gear, the gear is meshed with the rack, the bottom end of the insulating pull rod is fixedly connected with an operating handle, the operating handle passes through the bottom cover and extends to the bottom of the bottom cover.

[0009] Preferably, the insulating pull rod is made of insulating material, a rotating seal is provided on the bottom cover, a rotating seal is provided between the operating handle and the rotating seal, a limiting sleeve is connected to the insulating pull rod, and the limiting sleeve is connected to the inner contact seat.

[0010] Preferably, the two grounding structures each include a rod housing and a metal rod, the two rod housings are fixedly connected to the two external connecting shells respectively, the two metal rods are slidably connected in the two rod housings respectively, and the two metal rods are matched with the two external contact seats respectively.

[0011] Preferably, the two electromagnetically driven elastic structures each include a fixed frame, the two fixed frames are respectively fixedly connected to the two external connecting shells, the two fixed frames are hinged with a rotating shell, the two rotating shells are fixedly connected with a connecting spring, the two connecting springs are fixedly connected with a connecting seat, the two connecting seats are respectively connected to the two metal rods, the two rotating shells are fixedly connected with an upper permanent magnet, the outside of the two fixed frames are fixedly connected with a lower permanent magnet, the two fixed frames are slidably connected with a lifting frame, the bottom ends of the two lifting frames are fixedly connected with a lifting spring, the two lifting springs are respectively fixedly connected to the top ends of the two lower permanent magnets, and electromagnets are installed in the two lifting frames.

[0012] Preferably, the two electromagnets each include a spiral wire and a conductor column, the two lifting frames are each provided with a side opening groove, the two side opening grooves are each detachably connected with a closed mounting frame, the two conductor columns are respectively fixedly connected in the two closed mounting frames, the spiral wire is respectively wound around the two conductor columns, the two closed mounting frames are each provided with an external lead wire, and the two external lead wires are respectively electrically connected to the two spiral wires.

[0013] Preferably, a terminal stud is fixedly connected to the metal rod, a terminal hole is formed on the terminal stud, and a threaded cap is threadedly connected to the terminal stud.

[0014] Preferably, the two externally connected shells are both provided with observation hand holes, and the two observation hand holes respectively correspond to the two grounding structures. The two observation hand holes are fixedly connected with external mounting tubes by welding, and transparent covers are fixedly connected to the outside of the two external mounting tubes, which is convenient for position observation of the installation process, and visual cameras can be installed in the observation hand holes to intelligently observe the operation process and status of the equipment.

[0015] Preferably, each connection portion on the inner connection contact seat is installed with a shielding cover, and the shielding cover is used for covering and shielding the inner connection contact seat.

[0016] Compared with the prior art, the present invention provides an intelligent switching device for GIS / GIL insulation testing, which has the following beneficial effects:

[0017] In the present invention, an access system compatible with the power frequency withstand voltage equipment and the lightning impulse withstand voltage equipment is formed through the design of a transfer switching system. A new separate air chamber is set up to first connect the power frequency withstand voltage equipment and the lightning impulse withstand voltage equipment, and then connect them to the product, replacing the original product being connected to the power frequency withstand voltage equipment or the lightning impulse withstand voltage equipment separately. The product only needs to be connected to the equipment once for the power frequency withstand voltage and lightning impulse withstand voltage tests, reducing the risk of foreign matter generated during the assembly process. In addition, since the ports connecting the power frequency withstand voltage equipment and the lightning impulse withstand voltage equipment are changed from the original two ports for external connection to one port, the assembly space of a product that needs to be connected is saved, the floor space is reduced, and the problems of repeated disassembly, low efficiency and large floor space are solved as a whole.

[0018] (2) In the present invention, an adjustable grounding structure is formed by matching the grounding structure and the electromagnetically driven elastic structure. The operation mode is simpler, the operation adjustment can be performed automatically, and the adjustment operation is safer. By matching the switching switch, the switching system can be easily adjusted and switched between the power frequency withstand voltage equipment and the lightning impulse withstand voltage equipment. The switching work is directly performed in the intelligent switching device, saving a lot of test time. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the present invention;

[0020] Figure 2 For the present invention Figure 1 A schematic diagram of the local enlarged structure at point A in the middle;

[0021] Figure 3 For the present invention Figure 1 A schematic diagram of the local enlarged structure at B in the middle;

[0022] Figure 4 It is a schematic diagram of a partially cutaway three-dimensional structure of the present invention;

[0023] Figure 5 For the present invention Figure 4 A schematic diagram of the local enlarged structure at C in the middle;

[0024] Figure 6 For the present invention Figure 4 A schematic diagram of the local enlarged structure at D in the middle;

[0025] Figure 7 It is a schematic diagram of a three-dimensional structure of a cross-section of the internal connection contact seat, rack and gear etc. of the present invention;

[0026] Figure 8 It is a schematic diagram of the exploded three-dimensional structure of the lifting frame, the jacking spring and the spiral wire of the present invention;

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the present invention as a whole from another angle;

[0028] Fig.10 It is a schematic diagram of the three-dimensional structure of the present invention as a whole when viewed from above;

[0029] Fig.11 This is a schematic diagram of the adjustment of the power frequency withstand voltage test of the present invention;

[0030] Fig.12 This is a connection principle diagram of the power frequency withstand voltage test of the present invention;

[0031] Fig.13 This is a schematic diagram of adjustment of the lightning impulse withstand voltage test of the present invention;

[0032] Fig.14 This is a connection principle diagram of the lightning impulse withstand voltage test of the present invention;

[0033] Fig.15 It is a schematic diagram of the magnetic pole principle of the upper permanent magnet, the lower permanent magnet and the electromagnet when the metal rod of the present invention enters the pulled-out state relative to the rod housing;

[0034] Fig.16 It is a schematic diagram of the magnetic pole principle of the upper and lower permanent magnets, the lower permanent magnet and the electromagnet during the process of the metal rod of the present invention entering the insertion state relative to the rod housing.

[0035] In the figure: 1. Power frequency withstand voltage equipment; 2. Lightning impulse withstand voltage equipment; 3. Connection flange; 4. External four-way housing; 5. External connection housing; 6. External connection housing; 7. Bellows; 8. Basin insulator; 9. External contact seat; 10. Moving contact; 11. Connecting conductor; 12. Round contact; 13. Rack; 14. Insulating pull rod; 15. Limit installation groove; 16. Bottom cover; 17. Gear; 18. Operating handle; 19. Rotating seal; 20. Limit shaft sleeve; 21, rod housing; 22, metal rod; 23, fixing frame; 24, transfer shell; 25, connecting spring; 26, connecting seat; 27, upper permanent magnet; 28, lower permanent magnet; 29, lifting frame; 30, lifting spring; 31, spiral wire; 32, conductor column; 33, closed mounting frame; 34, external lead; 35, terminal stud; 36, terminal hole; 37, threaded cap; 38, external lead mounting tube; 39, transparent cover; 40, shielding cover; 41, internal contact seat. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] Example: See Figure 1-Figure 16, an intelligent switching device for GIS / GIL insulation test, including power frequency withstand voltage equipment 1 and lightning impulse withstand voltage equipment 2, and also including a transfer switching system, the power frequency withstand voltage equipment 1 and the lightning impulse withstand voltage equipment 2 are both provided with a connecting flange 3, the transfer switching system includes an external four-way shell 4, an external connecting shell 5 and two external connecting shells 6, the right end of the external four-way shell 4 is connected with a bellows 7, which is convenient for position adjustment of each shell assembly process and absorption of production and assembly errors, the two external connecting shells 6 are respectively connected with the left end of the external four-way shell 4 and the right end of the bellows 7, the two external connecting shells 6 are respectively connected with the two connecting flanges 3, and the two external connecting shells 6 are both provided with external contact seats 9, The two external contact seats 9 are fixedly connected to the power frequency withstand voltage device 1 and the lightning impulse withstand voltage device 2 respectively. The two external communication shells 6 are both equipped with grounding structures. The two grounding structures are both equipped with electromagnetically driven elastic structures. The two electromagnetically driven elastic structures are respectively installed on the two external communication shells 6. The two grounding structures include a rod shell 21 and a metal rod 22. The two rod shells 21 are respectively fixedly connected to the two external communication shells 6. The two metal rods 22 are respectively slidably connected in the two rod shells 21. The two metal rods 22 are respectively matched with the two external contact seats 9. The two electromagnetically driven elastic structures include a fixing frame 23. The two fixing frames 23 are respectively fixedly connected to the two external communication shells 6. The two fixing frames 23 are hinged. A transfer shell 24 is connected, and connecting springs 25 are fixedly connected to the two transfer shells 24, and connecting seats 26 are fixedly connected to the two connecting springs 25. The two connecting seats 26 are respectively connected to the two metal rods 22. The upper permanent magnets 27 are fixedly connected to the inside of the two transfer shells 24, and the lower permanent magnets 28 are fixedly connected to the outside of the two fixed frames 23. Lifting frames 29 are slidably connected to the two fixed frames 23. The bottom ends of the two lifting frames 29 are fixedly connected to the top springs 30, and the two lifting springs 30 are respectively fixedly connected to the tops of the two lower permanent magnets 28. Electromagnets are installed in the two lifting frames 29, and the two electromagnets include spiral wires 31 and conductor columns 32. Side opening grooves are opened on the two lifting frames 29. A closed mounting frame 33 is detachably connected in the slot, two conductor posts 32 are respectively fixedly connected in the two closed mounting frames 33, the spiral conductors 31 are respectively wound around the two conductor posts 32, and external leads 34 are respectively provided on the two closed mounting frames 33. The two external leads 34 are respectively electrically connected to the two spiral conductors 31, and an adjustable grounding structure is formed by matching the grounding structure and the electromagnetic driven elastic structure. The operation mode is simpler, the operation adjustment can be performed automatically, and the adjustment operation is safer. A terminal stud 35 is fixedly connected to the metal rod 22, a terminal hole 36 is opened on the terminal stud 35, and a threaded cap 37 is threadedly connected to the terminal stud 35, which facilitates the connection and installation of the metal rod 22 with the external grounding line.

[0038] It should be further explained that the two grounding structures are matched with two external contact seats 9 respectively, the top of the external four-way shell 4 is connected to the bottom of the external connection shell 5, and a basin insulator 8 is installed between the external four-way shell 4 and the external connection shell 5. Through the design of the transfer switching system, an access system adapted to the power frequency withstand voltage equipment 1 and the lightning impulse withstand voltage equipment 2 is formed. A new separate air chamber is set up to first connect the power frequency withstand voltage equipment 1 and the lightning impulse withstand voltage equipment 2, and then connect to the product, replacing the original product separately connected to the power frequency withstand voltage equipment 1 or the lightning impulse withstand voltage equipment 2. The product only needs to be connected to the equipment once for the power frequency withstand voltage and lightning impulse withstand voltage tests, reducing the risk of foreign matter generated during the assembly process. In addition, because the ports connecting the power frequency withstand voltage equipment 1 and the lightning impulse withstand voltage equipment 2 are changed from the original two ports for external connection to one port, the assembly space of a product that needs to be connected is saved, the floor space is reduced, and the overall problems of repeated disassembly, low efficiency and large floor space are solved.

[0039] It should be further explained that a switching switch is installed in the external four-way housing 4, and the switching switch matches the pot-type insulator 8 and the two external connection contact seats 9. The switching switch includes an internal connection contact seat 41 and a moving contact 10. The internal connection contact seat 41 is fixedly connected to the external four-way housing 4. A connecting conductor 11 is connected to the internal connection contact seat 41 by welding. The connecting conductor 11 matches the pot-type insulator 8. The moving contact 10 is inserted into the internal connection contact seat 41 as a moving part, and a contact finger is placed between the internal connection contact seat 41 and the moving contact 10 for sliding and conduction. Round contacts 12 are provided at both ends of the moving contact 10. The round contacts 12 are matched with the two external contact seats 9 respectively, and the internal contact seat 41 is equipped with an insulating control component, which is installed in the external four-way housing 4. The insulating control component includes a rack 13 and an insulating pull rod 14. A limited installation groove 15 is machined at the middle position of the moving contact 10. The rack 13 is fixedly connected in the limited installation groove 15. The insulating pull rod 14 is rotated outside and matched with a bottom cover 16. The bottom cover 16 is fixedly connected to the bottom end of the external four-way housing 4. A gear 17 is fixedly connected to the insulating pull rod 14, and the gear 17 is meshed with the rack 13. The bottom end of the insulating pull rod 14 is fixedly connected to an operating The handle 18, the operating handle 18 passes through the bottom cover 16 and extends to the bottom of the bottom cover 16, so as to facilitate the rotation operation of the insulating rod 14 outside the external four-way housing 4. The insulating rod 14 is made of insulating material. A rotating seal 19 is arranged on the bottom cover 16. A rotating seal is arranged between the operating handle 18 and the rotating seal 19. A limited sleeve 20 is connected to the insulating rod 14, and the limited sleeve 20 is connected to the inner contact seat 41. Through the matching of the switching switch, the switching system is convenient for adjusting and switching between the power frequency withstand voltage equipment 1 and the lightning impulse withstand voltage equipment 2. The switching work is directly performed at The test is carried out inside the intelligent switching device, which saves a lot of test time. The two external connecting shells 6 are both provided with observation hand holes, and the two observation hand holes correspond to the two grounding structures respectively. The two observation hand holes are fixedly connected with external installation tubes 38 by welding. The two external installation tubes 38 are fixedly connected with transparent covers 39 outside, which is convenient for position observation of the installation process. The operation process and status of the equipment can also be intelligently observed by installing visual cameras in the observation hand holes. Shielding covers 40 are installed at various connection parts on the internal contact seat 41. The shielding cover 40 is used to cover and shield the internal contact seat 41.

[0040] The power frequency withstand voltage equipment 1, lightning impulse withstand voltage equipment 2 and pot-type insulator 8 in this embodiment are all conventional equipment purchased on the market and known to those skilled in the art. In the present invention, we only use them without improving their structures and functions. For those skilled in the art, their setting methods, installation methods and electrical connection methods only need to be debugged and operated according to the requirements of their instruction manuals, and will not be described in detail here.

[0041] In summary, the working principle of the intelligent switching device for GIS / GIL insulation test is as follows: when in use, the intelligent switching device for GIS / GIL insulation test is first connected to the power frequency withstand voltage equipment 1 and the lightning impulse withstand voltage equipment 2, and is installed in a matching manner relative to the product unit through the external connection shell 5, and a product isolation switch is installed between the external connection shell 5 and the product unit, the air chamber in the intelligent switching device for GIS / GIL insulation test is evacuated and injected with insulating gas, and the external lead 34 is installed with the corresponding control circuit of the outside world. By changing the current direction of the external circuit, the change of the magnetic pole direction of the electromagnetic field formed by the electromagnet can be achieved, as shown in the attached figure. Fig.16 and attached Fig.15 The two directions of the magnetic field switching of the electromagnet are shown respectively. Due to the setting of the connecting spring 25, the pull-out state of the metal rod 22 relative to the rod housing 21 and the insertion state of the metal rod 22 relative to the rod housing 21 are respectively realized by the connecting spring 25 rotating into the upper extension limit position and the lower extension limit position. In the two limit states, the electromagnet is in a power-off state, in which the electromagnetic field disappears, and the magnetic attraction between the electromagnet and the upper permanent magnet 27 and the lower permanent magnet 28 disappears, and the magnetization effect between the electromagnet and the upper permanent magnet 27 and the lower permanent magnet 28 disappears. Figure 1 The metal rod 22 shown is pulled out from the rod housing 21 and enters the Fig.16 The metal rod 22 shown in the figure is inserted relative to the rod housing 21. It is only necessary to control the current of the electromagnet so that the electromagnetic field formed by the electromagnet forms a mutual magnetic attraction with the upper permanent magnet 27, and the electromagnetic field formed by the electromagnet forms a mutual magnetic attraction with the lower permanent magnet 28, and then the transfer housing 24 overcomes the elastic effect of the connecting spring 25 and rotates downward relative to the transfer housing 24, so that the metal rod 22 falls and is inserted relative to the rod housing 21. In this process, when the connecting spring 25 passes the limit compression position, the metal rod 22 is inserted into the rod housing 21. As the metal rod 22 continues to be inserted relative to the rod housing 21, the connecting spring 25 will form an auxiliary downward push of the metal rod 22 under the action of its own elastic force, and then the current of the electromagnet can be cut off. Under the elastic force of the connecting spring 25, the metal rod 22 is limited relative to the rod housing 21 after insertion, so as to achieve contact between the metal rod 22 and the external connection contact seat 9, and realize the electrical connection between the metal rod 22 and the external connection contact seat 9. In this state, the elastic force of the connecting spring 25 can overcome the elastic force of the lifting spring 30 to maintain the stability of the downward push insertion state of the metal rod 22, and the attachment Fig.16 The metal rod 22 shown is adjusted to the insertion state relative to the rod housing 21 as shown in the attached Fig.15When the metal rod 22 shown is in the pulled-out state relative to the rod housing 21, it is only necessary to turn on the electromagnet to control the electromagnetic field generated by the electromagnet to form magnetic repulsion with both the upper permanent magnet 27 and the lower permanent magnet 28, so that the transfer shell 24 has a tendency to rotate upward relative to the fixed frame 23, thereby achieving the pull-out of the metal rod 22 relative to the rod housing 21. After the connecting spring 25 passes through the extreme compression state, it enters the upper extension limit of the connecting spring 25, and thereafter the current of the permanent magnet can be cut off. In the state of the upper extension limit of the connecting spring 25, the metal rod 22 can be separated from the external contact seat 9 and the separation state can be invalidated.

[0042] Further, as attached Fig.12 and attached Fig.14 The state shown is a schematic diagram of line access in the experimental state of three product units, wherein DS1, DS2 and DS3 respectively represent the disconnectors between the three product units and the external connection housing 5, DS4 represents the disconnector between the moving contact 10 and the external contact seat 9 supporting the lightning impulse withstand voltage device 2, DS5 represents the disconnector between the moving contact 10 and the external contact seat 9 supporting the power frequency withstand voltage device 1, ES4 represents the grounding switch between the metal rod 22 and the external contact seat 9 supporting the lightning impulse withstand voltage device 2, and ES5 represents the grounding switch between the metal rod 22 and the external contact seat 9 supporting the power frequency withstand voltage device 1, as shown in the attached figure. Fig.11 The state shown is the adjustment state when the power frequency withstand voltage test is performed on the product unit. In this state, the moving contact 10 is inserted relative to the external contact seat 9 of the power frequency withstand voltage equipment 1, that is, DS5 is closed and DS4 is open. At the same time, the metal rod 22 and the external contact seat 9 of the lightning impulse withstand voltage equipment 2 are in contact with each other and enter the electrical connection state, that is, ES5 is open and ES4 is closed. After the adjustment is completed, by controlling DS1, DS2 and DS3 to close respectively, the electrical connection between the three product units and the power frequency withstand voltage equipment 1 can be achieved respectively, forming the power frequency withstand voltage test of the product unit, as shown in the attached figure. Fig.13 The state shown is the adjustment state when the product unit is subjected to a lightning impulse withstand voltage test. In this state, the moving contact 10 is inserted relative to the external contact seat 9 of the lightning impulse withstand voltage equipment 2, that is, DS5 is open and DS4 is closed. At the same time, the metal rod 22 and the external contact seat 9 of the power frequency withstand voltage equipment 1 are in contact with each other and enter an electrically connected state, that is, ES5 is closed and ES4 is open. After the adjustment is completed, by controlling DS1, DS2 and DS3 to close respectively, the three product units and the lightning impulse withstand voltage equipment 2 can be electrically connected respectively, thereby forming a lightning impulse withstand voltage test of the product unit.

[0043] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An intelligent switching device for GIS / GIL insulation testing, comprising a power frequency withstand voltage device (1) and a lightning impulse withstand voltage device (2), characterized in that: The invention also includes a switching system, wherein the power frequency withstand voltage device (1) and the lightning impulse withstand voltage device (2) are both provided with a connecting flange (3), and the switching system includes an external four-way shell (4), an external connecting shell (5) and two external connecting shells (6), wherein the right end of the external four-way shell (4) is connected with a bellows (7), and the two external connecting shells (6) are respectively connected with the left end of the external four-way shell (4) and the right end of the bellows (7), and the two external connecting shells (6) are respectively connected with the two connecting flanges (3), and the two external connecting shells (6) are both provided with an external connecting contact seat (9), and the two external connecting contact seats (9) are respectively connected with the power frequency withstand voltage device. The device (1) is fixedly connected to the lightning impulse withstand voltage device (2), two externally connected shells (6) are both provided with grounding structures, the two grounding structures are both provided with electromagnetically driven elastic structures, the two electromagnetically driven elastic structures are respectively provided on the two externally connected shells (6), the two grounding structures are respectively matched with two externally connected contact seats (9), the top end of the external four-way shell (4) is connected with the bottom end of the externally connected shell (5), a pot-type insulator (8) is provided between the external four-way shell (4) and the externally connected shell (5), a switching switch is provided in the external four-way shell (4), the switching switch is matched with the pot-type insulator (8) and the two externally connected contact seats (9).

2. An intelligent switching device for GIS / GIL insulation test according to claim 1, characterized in that: The switching switch comprises an inner connection contact seat (41) and a moving contact (10), wherein the inner connection contact seat (41) is fixedly connected to the outer four-way housing (4), a connecting conductor (11) is connected to the inner connection contact seat (41) by welding, the connecting conductor (11) matches the pot-type insulator (8), the moving contact (10) is inserted into the inner connection contact seat (41) as a moving part, and a contact finger is placed between the inner connection contact seat (41) and the moving contact (10) for sliding and conducting, round contacts (12) are arranged at both ends of the moving contact (10), the two round contacts (12) are matched with the two outer connection contact seats (9) respectively, and the inner connection contact seat (41) is equipped with an insulating control component, and the insulating control component is installed in the outer four-way housing (4).

3. An intelligent switching device for GIS / GIL insulation test according to claim 2, characterized in that: The insulating control assembly comprises a rack (13) and an insulating rod (14); a limit mounting groove (15) is machined at the middle position of the moving contact (10); the rack (13) is fixedly connected in the limit mounting groove (15); the insulating rod (14) is rotatably matched with a bottom cover (16); the bottom cover (16) is fixedly connected to the bottom end of the external four-way housing (4); the insulating rod (14) is fixedly connected with a gear (17); the gear (17) is meshed with the rack (13); the bottom end of the insulating rod (14) is fixedly connected with an operating handle (18); the operating handle (18) passes through the bottom cover (16) and extends below the bottom cover (16).

4. The intelligent switching device for GIS / GIL insulation test according to claim 3, characterized in that: The insulating pull rod (14) is made of insulating material, a rotating seal (19) is provided on the bottom cover (16), a rotating seal is provided between the operating handle (18) and the rotating seal (19), a limiting sleeve (20) is connected to the insulating pull rod (14), and the limiting sleeve (20) is connected to the inner contact seat (41).

5. The intelligent switching device for GIS / GIL insulation test according to claim 1, characterized in that: The two grounding structures each comprise a rod housing (21) and a metal rod (22); the two rod housings (21) are respectively fixedly connected to the two external communication shells (6); the two metal rods (22) are respectively slidably connected in the two rod housings (21); and the two metal rods (22) are respectively matched with two external connection contact seats (9).

6. An intelligent switching device for GIS / GIL insulation test according to claim 5, characterized in that: The two electromagnetically driven elastic structures each comprise a fixed frame (23), the two fixed frames (23) being fixedly connected to the two externally connected shells (6), the two fixed frames (23) being hingedly connected to a rotating shell (24), the two rotating shells (24) being fixedly connected to a connecting spring (25), the two connecting springs (25) being fixedly connected to a connecting seat (26), the two connecting seats (26) being connected to the two metal rods (22), the two rotating shells (24) being fixedly connected to an upper permanent magnet (27), the outsides of the two fixed frames (23) being fixedly connected to a lower permanent magnet (28), the two fixed frames (23) being slidably connected to a lifting frame (29), the bottom ends of the two lifting frames (29) being fixedly connected to a lifting spring (30), the two lifting springs (30) being fixedly connected to the top ends of the two lower permanent magnets (28), and the two lifting frames (29) being installed with an electromagnet.

7. An intelligent switching device for GIS / GIL insulation test according to claim 6, characterized in that: The two electromagnets each comprise a spiral conductor (31) and a conductor column (32); the two lifting frames (29) are each provided with a side opening slot; the two side opening slots are each detachably connected with a closed mounting frame (33); the two conductor columns (32) are respectively fixedly connected to the two closed mounting frames (33); the spiral conductor (31) is respectively wound around the two conductor columns (32); the two closed mounting frames (33) are each provided with an external lead wire (34); the two external lead wires (34) are respectively electrically connected to the two spiral conductors (31).

8. An intelligent switching device for GIS / GIL insulation test according to claim 7, characterized in that: A terminal stud (35) is fixedly connected to the metal rod (22), a terminal stud (35) is provided with a terminal hole (36), and a threaded cap (37) is threadedly connected to the terminal stud (35).

9. An intelligent switching device for GIS / GIL insulation test according to claim 8, characterized in that: The two externally connected shells (6) are both provided with observation hand holes, the two observation hand holes respectively corresponding to the two grounding structures, the two observation hand holes are both fixedly connected to external lead installation cylinders (38) by welding, and the outsides of the two external lead installation cylinders (38) are both fixedly connected to transparent covers (39).

10. An intelligent switching device for GIS / GIL insulation test according to claim 2, characterized in that: Each connection position on the inner connection contact seat (41) is installed with a shielding cover (40), and the shielding cover (40) is used for covering and shielding the inner connection contact seat (41).

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