High-voltage insulator surface breakdown test device

Abstract

The invention discloses a surface breakdown test device for a high-voltage insulator. The surface breakdown test device comprises a cylinder and an insulating support structure, an insulator is arranged in the cylinder body and separates an air chamber in the cylinder body; an end cover is arranged at the end part of the cylinder body; the insulating pillar structure comprises a first conductor, an insulating pillar and a second conductor. The first conductor is connected with the insulator, the second conductor is connected with the end cover, and the insulating pillar is arranged between the first conductor and the second conductor. The insulating pillar structure in the test device is convenient to disassemble and can be repeatedly used.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage electrical apparatus, in particular to a high-voltage insulator surface breakdown test device. BACKGROUND

[0002] Gas insulated metal enclosed high-voltage switchgear (GIS) is widely used in power systems due to its small footprint, high reliability, easy installation, and small maintenance amount. Its insulation performance mainly depends on solid insulation parts such as insulator pots, insulator pillars, and insulator cylinders. Due to the difference in dielectric constant between gas and solid medium, the electric field distribution is extremely uneven, and high field strength points are easily formed at the gas-solid interface or the gas-solid-metal three-junction interface, inducing surface discharge and further leading to surface breakdown of the insulator. Surface breakdown voltage has become a key indicator restricting the long-term operation reliability of GIS.

[0003] With the gradual application of environmentally friendly insulation gas, the influence law of different gas components, pressure, and proportion on surface insulation characteristics is not clear, and the industry generally lacks systematic and repeatable test data as a basis for insulation structure design. The existing test devices generally have the following shortcomings: The insulator pillar is usually fixedly connected with the conductor, and it is difficult to disassemble and replace after breakdown, resulting in low test efficiency; The structure has poor universality, and it is difficult to realize comparative study of the two typical surface breakdown modes of gas-solid interface and gas-solid-metal interface on the same platform.

[0004] Therefore, it is an urgent problem for those skilled in the art to research a high-voltage insulator surface breakdown test device which is easy to disassemble and reusable. SUMMARY

[0005] Therefore, the present application provides a high-voltage insulator surface breakdown test device which is easy to disassemble and reusable.

[0006] In order to achieve the above purpose, the present application adopts the following technical solutions: A high-voltage insulator surface breakdown test device, comprising: a cylinder, an insulator is arranged inside the cylinder, and the insulator separates the gas chambers in the cylinder; an end cover is arranged at the end of the cylinder; an insulator pillar structure, comprising a first conductor, an insulator pillar, and a second conductor; the first conductor is connected with the insulator, the second conductor is connected with the end cover, and the insulator pillar is arranged between the first conductor and the second conductor.

[0007] Preferably, a mounting cylinder is arranged at the connecting end of the insulator and the first conductor, and the end of the first conductor away from the insulator pillar is arranged in the mounting cylinder.

[0008] Preferably, the end cap has an inspection port on its surface, and an inspection cover plate is provided at the inspection port. The end of the second conductor away from the insulating support passes through the inspection port and is connected to the inspection cover plate.

[0009] Preferably, a first mounting groove is provided at one end of the first conductor near the insulating post, and the end of the insulating post is inserted into the first mounting groove.

[0010] Preferably, a second mounting groove is provided at one end of the second conductor near the insulating post, and the end of the insulating post is inserted into the second mounting groove.

[0011] Preferably, a spring is provided in the second mounting groove, and the other end of the spring abuts against the insulating post.

[0012] Preferably, the openings of both the first and second mounting slots are rounded.

[0013] Preferably, an observation window is provided on the side wall of the cylinder.

[0014] As can be seen from the above technical solution, compared with the prior art, the present invention discloses a high-voltage insulator surface breakdown test device, the beneficial effects of which are: (1) The insulation support structure and independent inspection cover are adopted for quick replacement. After breakdown, the test sample can be replaced separately without overall venting. (2) The axial clearance is eliminated by the spring preload structure, and the discharge path is visualized by the observation window and high-speed camera. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0016] Figure 1 A schematic diagram of the internal structure of the experimental device provided by the present invention; Figure 2 This is a schematic diagram of the insulating support structure provided by the present invention; Figure 3 Provided by the present invention Figure 2 Enlarged view of the structure at point A in the middle.

[0017] In the figure, 1-Insulator; 2-Cylinder; 3-First conductor; 4-End cover; 5-Inspection cover plate; 6-Second conductor; 7-Insulating support; 8-Spring; 9-Mounting cylinder. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] This invention discloses a surface breakdown test apparatus for high-voltage insulators, comprising: The cylinder 2 has an insulator 1 installed inside it, which separates the air chambers inside the cylinder 2; the end cap 4 is installed at the end of the cylinder. The insulating support structure includes a first conductor 3, an insulating support 7, and a second conductor 6. The first conductor 3 is connected to the insulator 1, the second conductor 6 is connected to the end cap 4, and the insulating support 7 is positioned between the first conductor 3 and the second conductor 6. The insulator 1 is a basin-type insulator used to isolate the internal cavity of the cylinder 2 from other gas chambers, preventing mutual interference between the chambers. This test device obtains the discharge characteristics of the insulator in insulating gas atmospheres of different pressures, compositions, and proportions, ultimately determining its insulation breakdown voltage. The insulator surface breakdown criterion test device is simple in design, highly reusable, and easy to observe and maintain, significantly improving test efficiency.

[0020] In one embodiment, the connection end between the insulator 1 and the first conductor 3 is provided with an installation cylinder 9, and the end of the first conductor 3 away from the insulating support 7 is placed inside the installation cylinder 9.

[0021] In one embodiment, an inspection port is provided on the surface of the end cap 4, and an inspection cover plate 5 is provided at the inspection port. The end of the second conductor 6 away from the insulating support 7 passes through the inspection port and connects to the inspection cover plate 5. The insulator 1, end cap 4, inspection cover plate 5, and cylinder 2 constitute a closed air chamber. The inspection cover plate 5 is used to replace the insulating support 7 after testing.

[0022] In one embodiment, a first mounting groove is provided at one end of the first conductor 3 near the insulating post 7, and the end of the insulating post 7 is inserted into the first mounting groove.

[0023] In one embodiment, a second mounting groove is provided at one end of the second conductor 6 near the insulating post 7, and the end of the insulating post 7 is inserted into the second mounting groove.

[0024] In one embodiment, a spring 8 is provided in the second mounting groove, and the other end of the spring 8 abuts against the insulating post 7. The spring 8 is used to eliminate the axial gap between the insulating post 7 and the first conductor 3 and the second conductor 6, so that they are in close contact.

[0025] In one embodiment, both the first and second mounting slots have rounded corners at their openings. The rounded corner design requires electric field simulation. Setting a large rounded corner (the same as the pre-designed rounded corner value) can optimize the electric field distribution in the three-way junction area, making the breakdown path more likely to flow from the conductor surface through the insulating gas to the insulator surface. Figure 3 The path indicated by the arrow in the enlarged image reveals the insulator breakdown characteristics at the gas-solid-metal interface. When a small fillet is set, the breakdown path most likely starts directly from the conductor-insulator interface and develops along the insulator surface. Figure 2 The path indicated by the arrow allows for the acquisition of the breakdown characteristics of the gas-solid interface insulator. After the test, the insulating support 7, spring 8, and second conductor 6 can be removed manually by removing the inspection cover 5, allowing for the inspection of the first conductor 3, second conductor 6, and insulating support 7, thus reducing the need for overall disassembly and hoisting.

[0026] In one embodiment, an observation window is provided on the side wall of the cylinder 2. The observation window is used in conjunction with a high-speed camera to observe the breakdown process.

[0027] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0028] The above description of the disclosed embodiments enables those skilled in the art to make or use the 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 invention. Therefore, the 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 surface breakdown test device for high-voltage insulators, characterized in that, include: A cylindrical body, wherein an insulator is provided inside the cylindrical body, and the insulator separates the air chambers inside the cylindrical body; The end cap is provided at the end of the cylinder; An insulating support structure includes: a first conductor, an insulating support, and a second conductor; the first conductor is connected to the insulator, the second conductor is connected to the end cap, and the insulating support is disposed between the first conductor and the second conductor.

2. The high-voltage insulator surface breakdown test device according to claim 1, characterized in that, The connection end between the insulator and the first conductor is provided with an installation cylinder, and the end of the first conductor away from the insulating support is placed inside the installation cylinder.

3. The high-voltage insulator surface breakdown test device according to claim 1, characterized in that, The end cap has an inspection port on its surface, and an inspection cover plate is provided at the inspection port. The end of the second conductor away from the insulating support passes through the inspection port and is connected to the inspection cover plate.

4. The high-voltage insulator surface breakdown test device according to claim 1, characterized in that, The first conductor has a first mounting groove at one end near the insulating post, and the end of the insulating post is inserted into the first mounting groove.

5. The high-voltage insulator surface breakdown test device according to claim 4, characterized in that, The second conductor has a second mounting groove at one end near the insulating post, and the end of the insulating post is inserted into the second mounting groove.

6. The high-voltage insulator surface breakdown test device according to claim 5, characterized in that, A spring is provided in the second mounting groove, and the other end of the spring abuts against the insulating post.

7. The high-voltage insulator surface breakdown test device according to claim 6, characterized in that, Both the first and second mounting slots have rounded corners at their openings.

8. The high-voltage insulator surface breakdown test device according to claim 1, characterized in that, An observation window is provided on the side wall of the cylinder.

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