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Composite organic insulation construction with variable dielectric coefficient-resistance and preparation thereof

A dielectric constant and organic insulation technology, which is applied in the field of composite material insulation structure and its preparation, can solve the problems of poor reliability and unstable material performance, and achieve the effect of improving vacuum withstand voltage performance and surface flashover voltage

Inactive Publication Date: 2012-01-04
XI AN JIAOTONG UNIV
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Problems solved by technology

However, the performance of materials used in modern electrical equipment in China is unstable and their reliability is poor

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  • Composite organic insulation construction with variable dielectric coefficient-resistance and preparation thereof
  • Composite organic insulation construction with variable dielectric coefficient-resistance and preparation thereof

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preparation example Construction

[0020] figure 1 The preparation method of the composite organic insulating structure with variable dielectric constant-resistivity includes the following steps:

[0021] 1) The polyethylene matrix 1 is prepared by conventional organic material technology, and its two ends are smoothed;

[0022] 2) Preparation of composite material wafer 2: according to mass percentage, take 1-90% of semi-conductive material and 10-99% of polyethylene for weighing. The semi-conductive material is a compound material of polyethylene and carbon black specially used for cables. The commercially available semi-conductive material is pyjbj-083, and each composition is mixed in an open rubber mixer for 20-30 Minutes, then cut into small pieces, preheat at 150°C for 10 minutes after filling the mold, keep the temperature and press in a flat vulcanizer for 3 to 5 minutes, the hot pressing pressure is 10Mpa, and finally make a 1mm thick compound After the plate is punched into a disc, the two ends ar...

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Abstract

The invention aims to improve flashover voltage along the surface in vacuum of an insulating medium, and discloses a composite organic insulation structure with variable dielectric constant and resistivity and a preparation method thereof. Trough a hot pressing method, two end surfaces of a polyethylene matrix is connected with a composite layer of semiconductive material and polyethylene in a planar manner. The preparation method comprises the following steps: (1), by adopting a conventional organic material process, the polyethylene matrix is prepared; (2), according to weight percent, 10% to 99% of polyethylene material and 1% to 90% of semiconductive material are proportioned, and after mixing and hot pressing, a composite layer is manufactured; and (3), the semiconductive material-polyethylene composite layer and the polyethylene matrix are respectively buffed and leveled, and then hot-pressed together, thereby forming the semiconductive material-polyethylene plus polyethylene and semeconductive material-polyethylene three-layer insulation structure. Both the resistivity and the dielectric constant of the insulation structure are obviously changed, and the vacuum surface flashover performance can be remarkably improved.

Description

technical field [0001] The invention relates to a composite material insulation structure with variable dielectric constant-resistivity and a preparation method thereof. Background technique [0002] As a special dielectric, vacuum is widely used in electrical equipment and electric vacuum devices due to its excellent dielectric properties, such as vacuum switches, high-intensity X-ray tubes, high-power microwave tubes, high-energy particle accelerators and pulsed power semiconductors switch etc. However, due to the surface flashover phenomenon in vacuum, the surface flashover voltage of the vacuum insulator surface is much lower than the vacuum gap or the bulk breakdown voltage of the insulating material with the same insulation distance, and shows great dispersion. [0003] On the basis of a large number of previous experiments, researchers at home and abroad have basically reached a consensus on the initial stage and the final stage of the surface flashover process. It ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B17/60H01B17/50H01B3/44
Inventor 李盛涛黄奇峰倪凤燕李建英焦兴六
Owner XI AN JIAOTONG UNIV
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