High-pressure wall bushing of three-element structure

Abstract

The invention relates to a high-voltage wall-piercing bushing with a three-element structure. A grounding-side attachment system is arranged on the grounding side of the wall-piercing bushing, and an electrode-side attachment system is arranged on the electrode side. The attachment system on the ground side is composed of an insulating part and a conductive part, and the insulating part is in close contact with the conductive part; the attachment system on the electrode side is made of insulating materials. The conductive part of the ground side attachment system is in contact with the ground side, and the insulating part is in contact with the conductive part. The insulating material of the electrode side attachment system is in contact with the electrode side. The attachment system on the ground side weakens the electric field strength near the flange, increases the corona inception voltage, and increases the diameter and thickness of the shed near the flange, which is equivalent to reducing the surface capacitance and increasing the flashover voltage; It can guide the movement trajectory of discharge charges, block the diffusion of discharge charges, prolong the discharge path of flashover, and increase the dry flashover voltage; inhibit pollution flashover and increase wet flashover voltage; the invention is also applicable to all other types of through-wall casing.

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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