High-pressure wall bushing of three-element structure

Abstract

The invention relates to a high-pressure wall bushing of a three-element structure. A grounding side attachment system is arranged on the grounding side of the wall bushing, and an electrode side attachment system is arranged on the electrode side of the wall bushing. The grounding side attachment system is composed of an insulation part and a conductive part which are in close contact. The electrode side attachment system is made of an insulation material. The conductive part of the grounding side attachment system is in contact with the grounding side, and the insulation part is in contact with the conductive part. The insulation material of the electrode side attachment system is in contact with the electrode side. According to the grounding side attachment system, the electric field intensity near a flange is reduced, the corona starting voltage is improved, the diameter and the thickness of an umbrella skirt near to the flange are increased, equivalently, the surface capacitance is reduced, and the flashover voltage is improved. The movement locus of discharge charges can be guided, diffusion of the discharge charges can be blocked, the discharge path of flashover is lengthened, and the dry flashover voltage is improved; pollution flashover is restrained, and the wet flashover voltage is improved; the three-element structure is also suitable for all other types of wall bushings.

Description

technical field [0001] The invention relates to a high-voltage wall-piercing bushing, in particular to a high-voltage wall-piercing bushing with a three-element structure. Background technique [0002] Bushings are lead insulation for introducing current-carrying conductors into metal boxes in electrical equipment or when busbars are passed through walls. The invention relates to a porcelain bushing, the insulating body of which is a porcelain part. [0003] The existing 10kV high voltage bushing 1 structure see Figure 5 , There is a ground electrode 4 and a conductive electrode 3. The surface voltage distribution of the bushing is very uneven, and the electric field is very concentrated at the edge of the ground electrode flange, and it is easy to start corona and flashover discharge from here, so the dry flashover voltage is not high. In the case of overvoltage, especially in the case of lightning overvoltage, its discharge voltage is low, which affects its lightning pr...

AI Technical Summary

Problems solved by technology

However, anti-fouling flashover coatings generally need to be constructed on site, and there are problems such as difficult quality assurance, high material and labor consumption, and high price, so it can only be used as a temporary and remedial measure

[0008] It is very difficult for insulators with traditional structures to increase the lightning impulse voltage and wet flashover voltage of the wall-piercing bushing after leaving the factory.

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