A pot-type insulator withstand voltage test device

Abstract

This utility model relates to the technical field of insulator testing devices, and discloses a basin-type insulator withstand voltage testing device, including a main body of the withstand voltage testing device and a test tank. The main body of the withstand voltage testing device includes a shielding cylinder, a connecting cylinder, a high-voltage inlet conductor, and a connecting conductor. Several test insulator basins are clamped one-to-one between adjacent shielding cylinders and connecting cylinders, and between two connecting cylinders, through their respective insulator basin flanges. Elastic grounding blocks can be pressed into the grounding block mounting holes on the shielding cylinder flange and the connecting cylinder flange. The elastic grounding blocks are in conductive contact with the corresponding test insulator basins and are also connected to a grounding wire. The main body of the withstand voltage testing device is placed in the test tank to conduct insulation tests on the test specimens. This utility model mainly solves the problems of low assembly efficiency due to multiple installation work surfaces during insulation testing of insulator basins, and low testing efficiency due to the need for multiple disassembly and reassembly tests to confirm abnormal insulation components once a failure is found during the test.

Description

Technical Field

[0001] This utility model relates to the technical field of insulator testing devices, and more specifically, to a basin-type insulator withstand voltage testing device. Background Technology

[0002] With the widespread application of GIS equipment in power systems, the reliability requirements for insulating basins, as the main insulating support components, are becoming increasingly stringent. Moreover, insulating basins account for a large proportion of the cost of GIS equipment. Therefore, the need to improve the reliability of insulating basins and reduce their costs is becoming increasingly prominent, and the testing requirements for insulating basins are also increasing accordingly.

[0003] When conducting insulation tests on insulating basins, the numerous installation work surfaces lead to low assembly efficiency. Furthermore, if a defect is found during the test, the abnormal insulating component needs to be disassembled and reassembled multiple times for testing, which further reduces the testing efficiency. In turn, the testing efficiency seriously affects the overall production efficiency of the machine.

[0004] Therefore, under the current circumstances, it is essential to provide a high-efficiency pot-type insulator withstand voltage test device. Utility Model Content

[0005] In view of this, the present invention proposes a basin-type insulator withstand voltage test device, the specific technical solution of which is as follows: A pot-type insulator withstand voltage test device includes: The main body of the withstand voltage test device includes a shielding cylinder, a connecting cylinder, a high-voltage inlet conductor, and a connecting conductor. Several connecting cylinders are sequentially connected in series via flanges to form a long cylindrical structure. Each connecting cylinder has a through hole for vacuuming and venting. The shielding cylinder flange at the rear end of the shielding cylinder has bolt mounting holes and a grounding block mounting hole. The first connecting cylinder flange at the front end of the connecting cylinder has only bolt mounting holes, while the second connecting cylinder flange at the rear end of the connecting cylinder has both bolt mounting holes and a grounding block mounting hole. Several test insulating basins are clamped between adjacent shielding cylinders and connecting cylinders, and between the two connecting cylinders, via their respective insulating basin flanges. Between the cylindrical bodies; the high-voltage inlet conductor extends from the front opening of the long cylindrical structure and presses against the convex surface of the foremost test insulating basin; a connecting conductor connects two adjacent test insulating basins; the front end of the connecting conductor presses against the concave surface of the corresponding test insulating basin through an electrical connection structure; the rear end of the connecting conductor is bolted to the convex surface of the corresponding test insulating basin; the concave surface of the last test insulating basin is bolted to a shielding ball; an elastic grounding block can be press-fitted into the grounding block mounting hole on the shielding cylinder flange and the connecting cylinder flange two; the assembled elastic grounding block makes conductive contact with the corresponding test insulating basin; and each elastic grounding block is connected to a grounding wire one. The test tank has a pressure-resistant tank body sealed with a grounding component and an inflation valve. The grounding component includes several grounding conductors. The main body of the pressure-resistant test device is placed inside the pressure-resistant tank body, and several grounding wires in the main body of the pressure-resistant test device are each connected to a corresponding grounding conductor. Each of the grounding conductors is connected to a grounding wire for normal grounding at one end outside the pressure-resistant tank body.

[0006] Preferably, the electrical connection structure includes a contact, a spring, and a retaining ring. A mounting groove is formed at the center of the front end of the connecting conductor. The contact includes a large-diameter rear section and a small-diameter front section. The rear section is located in the mounting groove and connected to the bottom of the mounting groove via the spring. The front section extends out of the mounting groove. A retaining ring is installed on the inner wall of one side of the mounting groove to prevent the rear section of the contact from leaving the mounting groove. An insulating basin center insert is provided at the concave center of the tested insulating basin, and the front section of the contact can press against the corresponding insulating basin center insert.

[0007] Preferably, an insulating basin metal insert is installed on the insulating basin flange, and the elastic grounding block is compressed and pressed against the insulating basin metal insert when it comes into contact with the corresponding insulating basin flange; threaded holes are provided at the radially perpendicular mounting holes of the grounding block in both the shielding cylinder flange and the connecting cylinder flange II, and the grounding wire I is fixed to the corresponding threaded hole by grounding wire fastening bolts.

[0008] Preferably, a groove is machined on the side of the connecting sleeve flange one near the corresponding insulating basin flange, an insulating ring is installed in the groove, and an insulating bushing is also installed in the bolt mounting hole of the connecting sleeve flange one; a bolt washer is provided between the bolt assembled in the bolt mounting hole of the connecting sleeve flange one and the side of the connecting sleeve flange one away from the groove, and an insulating gasket is also installed between the bolt washer and the corresponding side wall of the connecting sleeve flange one.

[0009] Preferably, the main body of the pressure testing device is mounted on the base plate by a bracket, and the combined structure of the main body of the pressure testing device, the bracket, and the base plate is placed inside the pressure tank.

[0010] Preferably, an insulating gasket is installed between the bracket and the base plate.

[0011] Preferably, an external inlet conductor is sealed at the front end of the pressure tank body. A shielding ring is installed at one end of the external inlet conductor located inside the pressure tank body. A second spring is installed on the side of the shielding ring facing the high-pressure inlet conductor, and the second spring, which is in a compressed state, presses against the front end of the high-pressure inlet conductor.

[0012] Preferably, the pressure tank is also provided with an observation window, which is aligned with the top pressure contact point between the shielding ring and the high-voltage inlet conductor.

[0013] Preferably, the grounding component further includes an insulating plate, which is bolted to the outside of the pressure tank wall; several grounding conductors are fixedly mounted through the insulating plate, and one end of each grounding conductor extends into the pressure tank.

[0014] Preferably, the front end of the shielding cylinder is provided with a shielding rolled edge.

[0015] Compared with existing technologies, the pot-type insulator withstand voltage test device of this utility model has the following advantages: (1) In this utility model, elastic grounding blocks are installed on the corresponding flanges of the shielding cylinder and the connecting cylinder. Since it is not required that the connecting cylinder be airtight, the connection between the flanges can be tightened by a small number of bolts, which reduces the amount of assembly work.

[0016] (2) In this utility model, the entire pressure tank is a gas chamber. An air filling valve is installed on the pressure tank. The test sample is placed in the pressure tank for testing. At the same time, holes are opened on the connecting cylinder, which not only improves the assembly efficiency, but also improves the efficiency of air filling and venting operations because it is convenient to fill and vent before and after the test.

[0017] (3) In this utility model, the elastic grounding block is compressed and pressed against the metal insert of the insulating basin when it comes into contact with the corresponding insulating basin flange. The reliable contact is achieved by pressing against the metal insert of the insulating basin, thus avoiding the formation of a floating potential on the metal insert of the insulating basin during the test.

[0018] (4) In this utility model, an insulating ring, an insulating bushing and an insulating gasket are provided at one end of the connecting cylinder flange (i.e., one end of the low-pressure side connecting cylinder), thus realizing the electrical isolation between the tested insulating basins and avoiding mutual interference during the test; when a failure occurs, the test can be carried out by group grounding, and the abnormal insulating parts can be quickly detected, which greatly improves the test efficiency.

[0019] (5) In this utility model, the electrical connection structure on the connecting conductor includes a contact, a spring and a retaining ring. By using an elastic electrical connection structure between the insulating basin center insert and the connecting conductor for top pressure connection, only one end of the connecting conductor needs to be fastened to the tested insulating basin by bolts, and the other end is connected by top pressure, which reduces the amount of assembly work.

[0020] (6) In this utility model, the pressure tank and related components, connecting conductors and related components, shielding cylinder and related elastic grounding blocks, integrated cylinder and related elastic grounding blocks, insulating plate and several grounding conductors can be used as an integrated test equipment after one installation, which reduces the amount of assembly work and improves work efficiency.

[0021] (7) If there is any abnormality during the test, the device of this utility model can be quickly detected by grouping the grounding wires two to detect abnormal insulation components instead of repeatedly disassembling and reassembling the test. This greatly improves the test efficiency.

[0022] (8) Because the present invention is tested inside a pressure tank, it not only improves the versatility of the tooling, but also reduces the strength requirements and installation requirements of the connecting cylinder, which can effectively reduce manufacturing costs. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0024] Figure 1 This is a diagram showing the withstand voltage test posture of a basin-type insulator withstand voltage test device in Embodiment 1 of this utility model.

[0025] Figure 2 This is a schematic diagram of the main body of the pressure resistance test device in Embodiment 1 of this utility model.

[0026] Figure 3 for Figure 2 An enlarged schematic diagram of part A shown in the figure.

[0027] Figure 4 for Figure 2 An enlarged schematic diagram of part B shown in the figure.

[0028] Figure 5 This is a schematic diagram of the opening of the shielding cylinder flange or connecting cylinder flange two in Embodiment 1 of this utility model.

[0029] Figure 6 This is a schematic diagram of the opening of the connecting sleeve flange in Embodiment 1 of this utility model.

[0030] Figure 7 This is a front view of the test tank in Embodiment 1 of this utility model.

[0031] Figure 8 This is a left view of the test tank in Embodiment 1 of this utility model.

[0032] Figure 9 This is a grounding schematic diagram of the pressure tank in Embodiment 1 of this utility model.

[0033] Figure 10 This is a diagram showing the withstand voltage test posture of a basin-type insulator withstand voltage test device in Embodiment 2 of this utility model.

[0034] In the diagram: 1-Shielding cylinder, 2-Connecting cylinder body, 3-High voltage inlet conductor, 4-Connecting conductor, 5-Shielding cylinder flange, 6-Connecting cylinder flange one, 7-Connecting cylinder flange two, 8-Bolt mounting hole, 9-Grounding block mounting hole, 10-Tested insulating basin, 11-Insulating basin flange, 12-Shielding ball, 13-Elastic grounding block, 14-Grounding wire one, 15-Pressure tank body, 16-Grounding conductor, 17-Grounding wire two, 18-Contact, 19-Spring one, 20-Retaining ring, 21-Mounting groove, 22-Insulating basin metal insert, 23-Grounding wire fastening bolt, 24-Insulating ring, 25-Insulating bushing, 26-Insulating gasket one, 27-Bracket, 28-Base plate, 29-External inlet conductor, 30-Shielding ring, 31-Observation window, 32-Insulating plate. Detailed Implementation

[0035] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model. In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] This utility model provides a basin-type insulator withstand voltage test device, which mainly solves the problems of low assembly efficiency due to the large number of installation work surfaces during insulation testing of the insulator basin, and low testing efficiency due to the need for multiple disassembly and reassembly tests to confirm abnormal insulation parts once a failure is found during the test.

[0037] The technical solution of this utility model will be described in detail below based on specific embodiments.

[0038] Example 1: As attached Figure 1 As shown, the withstand voltage test device for a basin-type insulator in this embodiment mainly includes the main body of the withstand voltage test device and the test tank.

[0039] Among them, as attached Figure 2 -Appendix Figure 6 As shown, the main body of the withstand voltage test device includes a shielding cylinder 1, a connecting cylinder 2, a high voltage inlet conductor 3, and a connecting conductor 4. Several connecting cylinders are connected in series backward through flanges to form a long cylindrical structure.

[0040] Bolt mounting holes 8 and grounding block mounting holes 9 are provided on the shielding cylinder flange 5 located at the rear end of the shielding cylinder. Only bolt mounting holes 8 are provided on the connecting cylinder flange 6 located at the front end of the connecting cylinder. Bolt mounting holes 8 and grounding block mounting holes 9 are provided on the connecting cylinder flange 7 located at the rear end of the connecting cylinder. Several tested insulating basins 10 are clamped one-to-one between the adjacent shielding cylinders and connecting cylinders and between the two connecting cylinders through their respective insulating basin flanges 11.

[0041] In this embodiment, the openings on the shielding cylinder flange 5 and the connecting cylinder flange 7 are as shown in the attached figure. Figure 4 As shown in the attached diagram, the opening on the connecting sleeve flange 6 is as follows. Figure 5As shown, only four bolt mounting holes are provided on the connecting sleeve flange.

[0042] The high-voltage inlet conductor 3 extends into the front opening of the long cylindrical structure and presses against the convex surface of the foremost test insulating basin 10. A connecting conductor 4 connects two adjacent test insulating basins. The front end of the connecting conductor 4 presses against the concave surface of the corresponding test insulating basin 10 through an electrical connection structure. The rear end of the connecting conductor 4 is connected to the convex surface of the corresponding test insulating basin 10 through bolts. The concave surface of the last test insulating basin 10 is connected to the shielding ball 12 through bolts.

[0043] The grounding block 13 can be press-fitted into the grounding block mounting hole 9 on the shielding cylinder flange 5 and the connecting cylinder flange 2 7. The assembled elastic grounding block 13 is in conductive contact with the corresponding test insulation basin 10. At the same time, each elastic grounding block 13 is connected to a grounding wire 14.

[0044] In actual testing, it is sufficient to press an elastic grounding block into one of the grounding block mounting holes on the shielding cylinder flange and the connecting cylinder flange 2 to meet the withstand pressure test requirements.

[0045] In practice, elastic grounding blocks can be pressed into the shielding cylinder flange and the connecting cylinder flange to serve as universal tooling. Once assembled, they do not need to be disassembled, and they do not need to be reassembled when used again, thus reducing the workload.

[0046] In this embodiment, as shown in the appendix Figure 7 -Appendix Figure 9 As shown, a grounding component is sealed and installed on the pressure tank 15 in the test tank. Figure 7 The location indicated by point C is the installation position of the grounding component) and the inflation valve ( Figure 7 (Point D in the middle refers to the installation position of the air filling valve). The grounding component includes several grounding conductors 16; the main body of the pressure test device is placed inside the pressure tank 15, and several grounding wires 14 in the main body of the pressure test device are each connected to a corresponding grounding conductor 16. Each grounding conductor is connected to a grounding wire 17 for normal grounding at one end outside the pressure tank.

[0047] In this embodiment, each connecting cylinder 2 is also provided with a through hole (the diameter of the through hole in this embodiment is 20mm) to perform vacuuming and gas filling / discharging during insulation testing inside the pressure tank 15.

[0048] In a further specific embodiment, the electrical connection structure includes a contact 18, a spring 19, and a retaining ring 20. A mounting groove 21 is formed at the center of the front end of the connecting conductor 4. The contact 18 includes a large-diameter rear contact section and a small-diameter front contact section. The rear contact section is located in the mounting groove 21 and connected to the bottom of the mounting groove 21 by the spring 19. The front contact section extends out of the mounting groove 21. A retaining ring 20 is installed on the inner wall of one side of the groove opening of the mounting groove 21 to prevent the rear contact section from leaving the mounting groove. An insulating basin center insert is provided at the concave center of the tested insulating basin 10, and the front contact section can press against the corresponding insulating basin center insert.

[0049] In practice, the contact 18, spring 19 and retaining ring 20 can be installed on the connecting conductor 4 first. After the assembly is completed, it can be used as a general tooling. Once assembled, it will not be disassembled again. When testing again, it can be used directly as a whole to improve work efficiency.

[0050] When conducting insulation tests on the tested insulator basin, first follow the instructions in the attached document. Figure 2 As shown in the diagram, one end of the connecting conductor 4, with the electrical connection structure already installed, is fastened to the convex surface of the corresponding test insulating basin 10 with two bolts. Then, the insulating basin is assembled in series with the shielding cylinder 1 and connecting cylinder 2, where the elastic grounding block 13 is installed. Each insulating basin flange 11 and the corresponding flanges on both sides are connected by four bolts as shown in the attached diagram. Figure 6 The bolt mounting holes 8 shown are fastened together. At this time, the other end of the connecting conductor 4 is pressed against the center insert of the adjacent insulating basin by the contact 18 to ensure reliable conduction. The concave surface of the last end of the tested insulating basin 10 is connected to the shielding ball 12 by bolts to achieve shielding.

[0051] In a further specific embodiment, an insulating basin metal insert 22 is installed on the insulating basin flange 11, as shown in the attached figure. Figure 3 As shown, the elastic grounding block 13 in this embodiment is an elastic element with a press-in ball head and a spring on the underside of the ball head. When the elastic grounding block 13 contacts the corresponding insulating basin flange 11, it is compressed and pressed against the insulating basin metal insert 22 to ensure reliable contact with the insulating basin metal insert 22 and avoid the formation of a floating potential on the insulating basin metal insert 22 during the test.

[0052] At the same time, threaded holes are provided at the radial vertical grounding block mounting holes in both the shielding cylinder flange 5 and the connecting cylinder flange 27, and the grounding wire 14 is fixed to the corresponding threaded hole by the grounding wire fastening bolt 23.

[0053] In practice, the grounding wire 14 is connected only to the threaded hole outside the grounding block mounting hole 9 where the elastic grounding block 13 is pressed in.

[0054] Furthermore, a groove is machined on the side of the connecting sleeve flange 1 near the corresponding insulating basin flange, and an insulating ring 24 is installed in the groove. An insulating bushing 25 is also installed in the bolt mounting hole 8 in the connecting sleeve flange 1. A bolt washer is provided between the bolt installed in the bolt mounting hole in the connecting sleeve flange 1 and the side of the connecting sleeve flange 1 away from the groove, and an insulating gasket 26 is also installed between the bolt washer and the corresponding side wall of the connecting sleeve flange 1.

[0055] The insulating ring 24, insulating bushing 25, and insulating gasket 26 serve to electrically isolate the connecting cylinder 2 on this side from the tested insulating basin 10 and the flange on the opposite side, thereby achieving electrical isolation between the tested insulating basins and preventing mutual interference during testing. When a non-compliance occurs, testing can be conducted via group grounding to quickly detect abnormal insulating components, greatly improving testing efficiency.

[0056] In a further specific embodiment, as shown in the appendix Figure 1 As shown, the main body of the pressure testing device is mounted on the base plate 28 via the bracket 27. The combined structure of the main body, bracket, and base plate is placed inside the pressure tank 15 to ensure that the main body of the pressure testing device remains horizontal. An insulating gasket is also installed between the bracket 27 and the base plate 28.

[0057] In a further specific embodiment, an external inlet conductor 29 is sealed at the front end of the pressure tank 15. A shielding ring 30 is installed at one end of the external inlet conductor located inside the pressure tank. A spring 2 is installed on the side of the shielding ring facing the high-pressure inlet conductor, and the spring 2 in a compressed state presses against the front end of the high-pressure inlet conductor 3.

[0058] In this embodiment, as shown in the appendix Figure 7 Appendix Figure 8 As shown, an observation window 31 is also provided on the pressure tank 15, and the observation window 31 is aligned with the top pressure contact point between the shielding ring and the high-voltage inlet conductor. Figure 7 The location indicated by E in the middle is the installation position of the observation window.

[0059] In this implementation, the pressure tank and related components can be used as a complete testing device after a single installation, thereby reducing assembly workload and improving work efficiency.

[0060] In a further specific embodiment, as shown in the appendix Figure 9 As shown, the grounding component also includes an insulating plate 32, which is bolted to the outside of the pressure tank 15. Several grounding conductors 16 are fixedly mounted on the insulating plate 32, with one end of each grounding conductor 16 extending into the pressure tank 15. The insulating plate 32 is used to electrically isolate the grounding conductors 16 from the pressure tank 15.

[0061] In this embodiment, the insulating board and several grounding conductors are cast as a whole, and once assembled, they are not disassembled again. They are used as a whole pressure-resistant tooling to improve work efficiency.

[0062] In this embodiment, the front end of the shielding cylinder 1 is also provided with a shielding rolled edge to enhance the shielding effect.

[0063] When conducting insulation tests on the tested insulator, the following method can be used: Figure 1 The attached document will be shown. Figure 2 The main body of the withstand voltage test device is placed on the base plate 28 via a bracket 27. An insulating gasket is placed between the bracket 27 and the base plate 28 to electrically isolate the bracket from the base plate. Then, the entire device is placed on the attached... Figure 7 Inside the pressure tank 15 shown, the high-voltage inlet conductor 3 and the shielding ring 30 in the main body of the pressure test device are in contact through the pressure of the second spring. The second spring has a certain amount of compression, which can ensure that the high-voltage inlet conductor 3 and the shielding ring 30 are reliably connected. The test voltage is applied through the external inlet conductor 29.

[0064] Before applying voltage, place one end of the grounding wire 14 as shown in the attached diagram. Figure 3 As shown, the grounding wire is fastened to the corresponding threaded holes of the shielding cylinder flange 5 and the connecting cylinder flange 7 via grounding wire fastening bolts 23. The other end of the grounding wire 14 is connected to the attached... Figure 9 The grounding conductor 16 is shown and numbered, and then grounded through the grounding wire 17. The grounding wire 17 is also numbered to correspond to different tested insulating basins 10.

[0065] After assembly, confirm that all bolts are tightened, and fill the pressure tank 15 with insulating gas at a certain pressure through the inflation valve for testing. Confirm that the pressure tank 15 is grounded, the grounding wire 17 is grounded, and the test voltage is introduced from the external conductor 29 to conduct insulation withstand voltage test and partial discharge test.

[0066] If any abnormality is found during the test, a partial discharge test can be conducted by grouping the grounding wires connected to different grounding conductors into two groups. The test method is as follows: number the grounding wires one and two on a one-to-one basis, divide the test samples into two groups on an equal basis, and conduct the partial discharge test on the test samples being tested. The test samples being tested are normally grounded through the grounding wire two, while the grounding wire two corresponding to the test samples not being tested is not grounded. Apply a test voltage to the high voltage inlet conductor end. If the test result meets the requirements, it is considered qualified; if it does not meet the test requirements, it is considered unqualified. The unqualified groups are then divided into two groups on an equal basis and tested in the same way until the problematic test sample is detected.

[0067] Example 2: As attached Figure 10As shown, the withstand voltage test device for basin-type insulators in this embodiment no longer includes a test tank. At the same time, the shielding cylinder is replaced with a connecting cylinder. Some of the bolt mounting holes on the connecting cylinder flange need to correspond one-to-one with the metal inserts of the insulating basin on the insulating basin flange. In addition, the elastic grounding block is no longer installed on the connecting cylinder flange, and no through holes are opened on the connecting cylinder. Instead, an air filling valve is installed to individually fill each connecting cylinder with air. The test voltage is directly introduced on the high voltage inlet conductor and grounded through the grounding wire. Other test methods are the same as in Embodiment 1.

[0068] The above method can also test multiple test insulators at the same time. However, since there are many air chambers, they need to be filled with air individually. In addition, there are many bolts to tighten in order to ensure airtightness and safety. Therefore, the working efficiency is lower than that of the method in Example 1.

[0069] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0070] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for testing the withstand voltage of a pot-type insulator, characterized by comprising: include: The main body of the withstand voltage test device includes a shielding cylinder, a connecting cylinder, a high-voltage inlet conductor, and a connecting conductor. Several connecting cylinders are sequentially connected in series via flanges to form a long cylindrical structure. Each connecting cylinder has a through hole for vacuuming and venting. The shielding cylinder flange at the rear end of the shielding cylinder has bolt mounting holes and a grounding block mounting hole. The first connecting cylinder flange at the front end of the connecting cylinder has only bolt mounting holes, while the second connecting cylinder flange at the rear end of the connecting cylinder has both bolt mounting holes and a grounding block mounting hole. Several test insulating basins are clamped between adjacent shielding cylinders and connecting cylinders, and between the two connecting cylinders, via their respective insulating basin flanges. Between the cylindrical bodies; the high-voltage inlet conductor extends from the front opening of the long cylindrical structure and presses against the convex surface of the foremost test insulating basin; a connecting conductor connects two adjacent test insulating basins; the front end of the connecting conductor presses against the concave surface of the corresponding test insulating basin through an electrical connection structure; the rear end of the connecting conductor is bolted to the convex surface of the corresponding test insulating basin; the concave surface of the last test insulating basin is bolted to a shielding ball; an elastic grounding block can be press-fitted into the grounding block mounting hole on the shielding cylinder flange and the connecting cylinder flange two; the assembled elastic grounding block makes conductive contact with the corresponding test insulating basin; and each elastic grounding block is connected to a grounding wire one. The test tank has a pressure-resistant tank body sealed with a grounding component and an inflation valve. The grounding component includes several grounding conductors. The main body of the pressure-resistant test device is placed inside the pressure-resistant tank body, and several grounding wires in the main body of the pressure-resistant test device are each connected to a corresponding grounding conductor. Each of the grounding conductors is connected to a grounding wire for normal grounding at one end outside the pressure-resistant tank body.

2. A kind of basin type insulator pressure test device according to claim 1, with, The electrical connection structure includes a contact, a spring, and a retaining ring. A mounting groove is formed at the center of the front end of the connecting conductor. The contact includes a large-diameter rear section and a small-diameter front section. The rear section is located in the mounting groove and connected to the bottom of the mounting groove through the spring. The front section extends out of the mounting groove. A retaining ring is installed on the inner wall of one side of the mounting groove to prevent the rear section of the contact from leaving the mounting groove. An insulating basin center insert is provided at the concave center of the tested insulating basin. The front section of the contact can press against the corresponding insulating basin center insert.

3. A kind of basin type insulator pressure test device according to claim 1, with, An insulating basin metal insert is installed on the insulating basin flange. When the elastic grounding block comes into contact with the corresponding insulating basin flange, it is compressed and pressed against the insulating basin metal insert. Threaded holes are provided at the radially perpendicular mounting holes of the grounding block in both the shielding cylinder flange and the connecting cylinder flange II. The grounding wire I is fixed to the corresponding threaded hole by grounding wire fastening bolts.

4. A kind of basin type insulator pressure test device according to claim 3, characterized by, The connecting sleeve flange has a groove machined on the side near the corresponding insulating basin flange, and an insulating ring is installed in the groove. An insulating bushing is also installed in the bolt mounting hole of the connecting sleeve flange. A bolt washer is provided between the bolt assembled in the bolt mounting hole of the connecting sleeve flange and the side of the connecting sleeve flange away from the groove, and an insulating gasket is also installed between the bolt washer and the corresponding side wall of the connecting sleeve flange.

5. A kind of basin type insulator pressure test device according to claim 1, characterized by, The main body of the pressure resistance test device is mounted on the base plate by a bracket, and the structure consisting of the main body of the pressure resistance test device, the bracket, and the base plate is placed inside the pressure tank.

6. A kind of basin type insulator pressure test device according to claim 5, with, An insulating gasket is installed between the bracket and the base plate.

7. A kind of basin type insulator pressure test device according to claim 1, wherein, An external inlet conductor is sealed at the front end of the pressure tank. A shielding ring is installed at one end of the external inlet conductor located inside the pressure tank. A second spring is installed on the side of the shielding ring facing the high-pressure inlet conductor, and the second spring, which is in a compressed state, presses against the front end of the high-pressure inlet conductor.

8. A kind of basin type insulator pressure test device according to claim 7, with, The pressure tank is also provided with an observation window, which is aligned with the top pressure contact point between the shielding ring and the high-voltage inlet conductor.

9. A kind of basin type insulator pressure test device according to claim 1, with, The grounding component also includes an insulating plate, which is bolted to the outside of the pressure tank wall; several grounding conductors are fixedly mounted through the insulating plate, and one end of each grounding conductor extends into the pressure tank.

10. A kind of basin type insulator pressure test device according to claim 1, with, The front end of the shielding cylinder is provided with a shielding rolled edge.

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