Sample making method used for ageing and breakdown test

A technology for breakdown test and sample preparation, which is applied in the field of material processing and can solve the problems of small breakdown results and air corrosion.

Inactive Publication Date: 2016-08-17
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the aging test, especially in the long-term aging test, the air corrosion is serious at the chamfer of the electrode, and the

Method used

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  • Sample making method used for ageing and breakdown test
  • Sample making method used for ageing and breakdown test

Examples

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Embodiment Construction

[0023] The equipment is a flat vulcanizing machine. In this case, the maximum hydraulic pressure of the flat vulcanizing machine is 15mpa. Other supporting tools include: 2 pieces of pressure-sampling steel plates of the same size (dimensions: length = 20 cm, width = 15 cm, height = 0.5 cm, one side of which is polished to a smooth mirror surface), mold 1 (dimensions: length = 20 cm, width = 15 centimeters, height = 3 centimeters, 6 diameters are evenly distributed to be the through hole of 6.6 centimeters), mold 2 (size: length = 7.8 centimeters, width = 7.8 centimeters, height = 1.5 centimeters, with a height of 2.8 millimeters, diameter 1.5cm convex cap), and alcohol, cotton, mylar.

[0024] Cut the polyester film to the size of the sample steel plate, wipe the 2 steel plates and the 2 cut polyester films with cotton smear alcohol, after the alcohol dries, attach the polyester film to the smooth mirror surface of the steel plate to protect The shape of the intermediate sam...

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Abstract

The invention discloses a sample making method used for ageing and breakdown test. The method comprises the following steps: preparing a polyolefin material through adopting a hot pressing technology, pressing the polyolefin material in a flat vulcanizer to form a sheet or plate-shaped sample; processing the sheet or plate-shaped sample in the flat vulcanizer through using a die with semispherical projections to form a sample with grooves, placing the die in the flat vulcanizer, and synchronously cooling the die with the vulcanizer to room temperature in order to obtain a sample with grooves; and spraying a layer of a conductive metal material surrounding and in the grooves of the sample with grooves. The required shape and dimensions are reached through secondary thermal forming processing of the sheet or plate-shaped sample by deforming the sheet (plate) via the die and a pressure, and matching processes are combined, so application of the target technology is realized, and the test sample made in the invention can effectively eliminate the edge effect and avoid surface flashover in order to obtain accurate breakdown voltage and ageing experiment data.

Description

technical field [0001] The invention belongs to a material processing technology, in particular to a sample preparation method which can be used for aging and breakdown tests. Background technique [0002] When testing the dielectric and mechanical properties of polyolefin materials, it is often necessary to press cylindrical or spherical small particle materials into sheet (plate) samples of a certain thickness. According to its melting characteristics, it is generally prepared by hot pressing method. The specific method is to first select a specific thickness according to the experimental requirements, press the insulating material to a specific thickness through a flat vulcanizing machine at a certain temperature, and then recrystallize it to form a flat plate. sample. [0003] In the aging or breakdown test of materials, since the breakdown field strength of the solid dielectric is much higher than that of the air medium, when the flat solid dielectric is placed in the ...

Claims

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Application Information

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IPC IPC(8): G01N1/28G01R31/20
CPCG01N1/286G01R31/20
Inventor 侯帅傅明利田野惠宝军卓然王亚吴锴
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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