High-voltage cable joint insulating material voltage-resistant performance test cup and method

Abstract

The invention relates to a high-voltage cable joint insulating material voltage resistance test cup and method, the high-voltage cable joint insulating material voltage resistance test cup comprises a cup body, a circular grounding electrode, a nylon cover and a high-voltage electrode, the nylon cover covers the cup body, the middle part of the nylon cover is provided with a through circular hole, the high-voltage electrode passes through the nylon cover and goes deep into the cup body, and the circular grounding electrode is installed at the bottom of the cup body. In the voltage withstanding process, the device cannot be damaged, and if the sample is broken down, the device can be repeatedly used only by replacing the transformer oil filled in the test cup. And meanwhile, only different test pieces need to be replaced in each test, so that the power frequency withstand voltage test can be carried out on various different sheet-shaped insulating materials. According to the test cup, the requirement for the sample area is not large enough, the sample area is determined, it can be guaranteed that the test can be smoothly carried out without being large enough, and a guarantee is provided for power frequency withstand voltage testing of plate-shaped and sheet-shaped insulating materials with limited areas; the test cup is small in size, the structure and the shape of a container for containing surrounding media are stipulated, and the test device is normalized and convenient to operate.

Description

Technical Field

[0001] The invention belongs to the technical field of high-voltage cable detection, in particular to a pressure-resistant performance test cup and method for insulating materials of high-voltage cable joints. Background Art

[0002] In order to judge the insulation state of the high-voltage cable joint insulation material, various tests and inspections are required. The AC withstand voltage test is to apply a test voltage much higher than the working voltage to the insulation of electrical equipment. The insulation level is tested according to the tolerance of the electrical equipment to the test voltage, which can effectively find the reduction of the withstand voltage strength of the insulating material caused by various defects. The power frequency AC withstand voltage test is the most effective and direct method to test the insulation strength of electrical equipment. At present, the power frequency withstand voltage test of plate-shaped and sheet-shaped insulating materials is mostly based on the provisions of "GB / T1408.1-2006 Insulating Material Electrical Strength Test Method Part 1: Test at Power Frequency", and the sample is placed between electrodes of unequal diameters or equal diameters for power frequency withstand voltage test. During the test, in order to prevent flashover during the process, the following two technical means are usually used: 1. For tests perpendicular to the surface of the material, the area of ​​the sample is made large enough; 2. The sample is placed in the surrounding medium selected to prevent flashover for testing. In most cases, transformer oil that complies with IEC60296-2003 is the most suitable medium. The standard only stipulates the shape, structure and size of the withstand voltage electrode. When the technicians are performing the power frequency withstand voltage test, due to the lack of exact regulations on the size of the sample area and the container containing the surrounding medium, they can only make their own regulations based on experience for the uncertain links in the test, resulting in unstable test results and even frequent flashovers, leading to test failures. Therefore, it is necessary to carry out design research on the power frequency withstand voltage performance test device for insulating materials. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and to propose a cup and method for testing the withstand voltage performance of insulating materials of high-voltage cable joints. The present invention has low requirements on the sample area. The sample area is determined and does not need to be large enough to ensure the smooth progress of the test, which provides a guarantee for the power frequency withstand voltage test of plate-like and sheet-like insulating materials with limited area; the test cup is small in size, and the structure and shape of the container for holding the surrounding medium are specified, the test device is normalized, and it is easy to operate.

[0004] The present invention solves the technical problem by adopting the following technical solutions:

[0005] The high-voltage cable joint insulation material withstand voltage performance test cup includes a cup body, a circular grounding electrode, a nylon cover and a high-voltage electrode, wherein the nylon cover is covered on the top of the cup body, a penetrating circular hole is provided in the middle of the nylon cover, the high-voltage electrode passes through the nylon cover and penetrates into the cup body, and the circular grounding electrode is installed at the bottom of the cup body.

[0006] Moreover, a groove is provided at the part where the bottom of the nylon cover is joined with the cup body, and a convex block is provided at the part where the top of the cup body is joined with the nylon cover, wherein the groove and the convex block cooperate to make the nylon cover and the cup body join more tightly.

[0007] A method for testing a high-voltage cable joint insulation material withstand voltage performance test cup comprises the following steps:

[0008] Step 1: Place the disc-shaped insulating sample on the circular grounding electrode at the bottom of the cup, pour transformer oil into the test cup, and adjust the oil level;

[0009] Step 2: Place the nylon cover of the test cup on the cup body;

[0010] Step 3, adjust the position of the high-voltage electrode so that the high-voltage electrode falls on the upper surface of the disc-shaped sample by its own gravity;

[0011] Step 4: Ground the wire and high voltage lead, and check the test circuit;

[0012] Step 5: Turn on the power, set the test voltage, and conduct the test.

[0013] Moreover, the transformer oil in step 1 complies with the provisions of IEC60296-2020.

[0014] The advantages and positive effects of the present invention are:

[0015] The present invention includes a cup body, a circular grounding electrode, a nylon cover and a high-voltage electrode, wherein the nylon cover is covered on the top of the cup body, a circular hole is provided in the middle of the nylon cover, the high-voltage electrode passes through the nylon cover and penetrates into the cup body, and the circular grounding electrode is installed at the bottom of the cup body. In the process of withstand voltage, the device of the present invention will not be damaged. If the sample is punctured, it only needs to replace the transformer oil filled in the test cup, and it can be reused. At the same time, it only needs to replace different sample pieces for each test, and various sheet-like insulating materials can be subjected to power frequency withstand voltage tests. The test cup does not require a large sample area. The sample area is determined and does not need to be large enough to ensure the smooth conduct of the test, which provides a guarantee for the power frequency withstand voltage test of plate-like and sheet-like insulating materials with limited area; the test cup is small in size, and the structure and shape of the container for holding the surrounding medium are specified, and the test device is normalized for easy operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a front view of the present invention;

[0017] Figure 2 It is a perspective view of the present invention.

[0018] Description of labels:

[0019] 1-cup body, 2-circular grounding electrode, 3-nylon cover, 4-high voltage electrode, 5-groove, 6-bump. DETAILED DESCRIPTION

[0020] The present invention is further described in detail below with reference to the accompanying drawings.

[0021] High voltage cable joint insulation material withstand voltage performance test cup, such as Figure 1 and Figure 2 As shown, it includes a cup body 1, a circular grounding electrode 2, a nylon cover 3 and a high-voltage electrode 4, wherein the nylon cover is covered on top of the cup body, a circular hole is provided in the middle of the nylon cover, the high-voltage electrode passes through the nylon cover and penetrates into the cup body, and the circular grounding electrode is installed at the bottom of the cup body.

[0022] A groove 5 is provided at the part where the bottom of the nylon cover joins with the cup body, and a protrusion 6 is provided at the part where the top of the cup body joins with the nylon cover, wherein the groove and the protrusion cooperate to make the nylon cover and the cup body join more tightly.

[0023] The present invention designs and studies the power frequency withstand voltage test device for insulating materials. A disc-shaped insulating sample is used in the test cup, and the power frequency withstand voltage test part of the sample adopts a cup-shaped structure. The cup can be filled with transformer oil as the surrounding medium. A circular grounding electrode is provided at the bottom of the test cup. The high-voltage electrode passes through the nylon cover of the test cup to introduce high voltage into the cup. The voltage is applied to the sample by overlapping the cup body and probing to the bottom of the cup. The grounding electrode is embedded in the base at the bottom of the test cup.

[0024] A method for testing a high-voltage cable joint insulation material withstand voltage performance test cup comprises the following steps:

[0025] Step 1: Place the disc-shaped insulating sample on the grounding electrode, pour transformer oil that complies with IEC60296-2020 into the test cup, and adjust the oil level;

[0026] Step 2: Place the nylon cover of the test cup on the cup body;

[0027] Step 3, adjust the position of the high-voltage electrode so that the high-voltage electrode falls on the upper surface of the disc-shaped sample by its own gravity;

[0028] Step 4: Ground the wire and high voltage lead, and check the test circuit;

[0029] Step 5: Turn on the power, set the test voltage, and conduct the test.

[0030] During the withstand voltage test of the present invention, the device will not be damaged. If the sample is punctured, it only needs to replace the transformer oil filled in the test cup, and the device can be reused. It only needs to replace different sample pieces for each test, and various sheet-like insulating materials can be subjected to power frequency withstand voltage tests. The test cup does not require a large sample area. The sample area is determined, and the test can be carried out smoothly without being large enough, which provides a guarantee for the power frequency withstand voltage test of plate-like and sheet-like insulating materials with limited areas. The test cup is small in size, and the structure and shape of the container containing the surrounding medium are specified, so the test device is normalized and easy to operate.

[0031] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention includes but is not limited to the embodiments described in the specific implementation manner. Any other implementation manners derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. High voltage cable joint insulation material withstand voltage performance test cup, characterized by: It includes a cup body, a circular grounding electrode, a nylon cover and a high-voltage electrode, wherein the nylon cover is covered on the top of the cup body, a penetrating circular hole is provided in the middle of the nylon cover, the high-voltage electrode passes through the nylon cover and penetrates into the cup body, and the circular grounding electrode is installed at the bottom of the cup body.

2. High-voltage cable joint insulation material withstand voltage performance test cup, characterized by: The part where the bottom of the nylon cover is joined with the cup body is provided with a groove, and the part where the top of the cup body is joined with the nylon cover is provided with a bulge, wherein the groove and the bulge cooperate to make the nylon cover and the cup body join more tightly.

3. A method for testing the high-voltage cable joint insulation material withstand voltage performance test cup according to any one of claims 1 and 2, characterized in that: The following steps are involved: Step 1: Place the disc-shaped insulating sample on the circular grounding electrode at the bottom of the cup, pour transformer oil into the test cup, and adjust the oil level; Step 2: Place the nylon cover of the test cup on the cup body; Step 3, adjust the position of the high-voltage electrode so that the high-voltage electrode falls on the upper surface of the disc-shaped sample by its own gravity; Step 4: Ground the wire and high voltage lead, and check the test circuit; Step 5: Turn on the power, set the test voltage, and conduct the test.

4. The method for testing the high-voltage cable joint insulation material withstand voltage performance test cup according to claim 3 is characterized in that: The transformer oil in step 1 complies with the provisions of IEC60296-2020.

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