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Shielding electrode for corona prevention of gas bushing and preparation process thereof

A technology of shielding electrodes and gas sleeves, which is applied to devices, circuits, and electrical components coated with liquid on the surface, which can solve problems such as electrical aging, reduce electric field strength, reduce process difficulty, and improve electrical performance.

Active Publication Date: 2019-05-31
JIANGSU SHENMA ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the electric field distribution inside the gas sleeve can be optimized by changing the electrode structure, the surface of the metal shielding electrode actually produced is not smooth, and small burrs on the surface will cause electric field distortion
Spraying insulating varnish on the surface can solve the problem of surface burrs, but the insulating varnish coating sprayed, under normal operating conditions, is subject to a large field strength for a long time, and is prone to electrical aging

Method used

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  • Shielding electrode for corona prevention of gas bushing and preparation process thereof
  • Shielding electrode for corona prevention of gas bushing and preparation process thereof

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Experimental program
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Effect test

Embodiment 1

[0034] The traditional shielding electrode without surface treatment has limited processing accuracy, and there are tiny burrs on the surface, resulting in local electric field distortion. When the electric field is high, the insulating gas here will be broken down first and discharge. Spraying insulating varnish on the surface can solve the problem of surface burrs, but the insulating varnish coating after spraying is prone to electrical aging when it withstands a large field strength for a long time under normal operating conditions. Therefore, this embodiment provides a shielding electrode for gas sleeve anti-corona, such as figure 1 As shown, the shielding electrode 10 is arranged at the bottom of the gas sleeve 20, and the conductive rod 30 is fixed on the upper flange 50 and penetrates inside the gas sleeve 20. The shielding electrode 10 is surrounded by the bottom end of the conductive rod 30 and fixed On the lower flange 60, a layer of semi-conductive layer 40 is spray...

Embodiment 2

[0039] Embodiment 2 is the preferred embodiment of embodiment 1

[0040] This embodiment provides a shielding electrode for anti-corona of the gas sleeve, the shielding electrode 10 is arranged inside the gas sleeve 20, the gas sleeve 20 is provided with a conductive rod 30, and the surface of the shielding electrode 10 is provided with a semi-conductive layer 40.

[0041] In some embodiments, the shielding electrode 10 is made of aluminum alloy.

[0042] Preferably, the surface resistivity of the semiconducting layer 40 is 10 3 Ω~10 5 Ω.

[0043] Of course, according to different gas insulating sleeves and shielding electrodes of different materials or structures, the preference of the surface resistivity of the semiconductive layer should also be adjusted accordingly.

[0044] The beneficial effects obtained by the shielding electrodes provided above are basically consistent with those of the above embodiments, and will not be described here one by one.

Embodiment 3

[0046]In this embodiment, on the basis of the above-mentioned embodiments, a preparation process of the shielding electrode used for the gas bushing to prevent corona is proposed, and the preparation process is used to obtain the shielding electrode used for the gas bushing to prevent corona. The preparation process adopts the electrostatic powder spraying method. The working principle of the electrostatic powder spraying method is: the paint sprayed by the electrostatic powder spray gun makes the powder particles negatively charged while the paint is dispersed, and the charged powder particles are affected by air flow (or centrifugal force and other effects) force) and electrostatic attraction, it is applied to the grounded object, and then heated, melted and solidified to form a film.

[0047] The specific spraying process is as follows:

[0048] Firstly, pre-treatment of electrostatic spraying is required, including degreasing, rust removing, phosphating and passivation; th...

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Abstract

The invention discloses a shielding electrode for corona prevention of a gas bushing. The shielding electrode is disposed inside the gas bushing. The shielding electrode is fixedly disposed on a lowerflange around a conductive rod. The surface of the shielding electrode is provided with a semi-conductive layer. The surface resistivity of the semi-conductive layer is 103 [omega] to 1011 [omega]. The invention further provides a preparation process for obtaining the shielding electrode for corona prevention of the gas bushing, specifically including the following steps of S1: preprocessing: de-oiling, de-scaling, phosphating, and passivating the shielding electrode successively; S2: spraying: spraying the surface of the shielding electrode with a powder coating by an electrostatic sprayingmethod; S3: solidifying: solidifying the sprayed the shielding electrode at a high temperature and then cooling the shielding electrode. The shielding electrode ensures a solidified smooth surface byelectrostatic spraying of the semi-conductive molding powder. Due to the conductive property, the problem is solved that a conventional sprayed insulating paint is liable to electrical aging, and theelectrical performance of the gas bushing can be obviously improved, and the process is difficult and low in cost.

Description

technical field [0001] The invention relates to the field of anti-corona shielding electrodes for gas bushings, in particular to a shielding electrode for gas bushing anti-corona and a preparation process thereof. Background technique [0002] The main function of installing the shielding electrode inside the gas bushing is to shield the sharp corners of the metal flange at the bottom of the bushing to prevent discharge at the tip of the inner wall of the flange. At present, the shielding electrode of the gas sleeve is mostly made of aluminum alloy. The structure and size of the shielding electrode are usually optimized and designed through electric field simulation calculations, so as to increase the partial discharge inception voltage of the gas sleeve. For the surface treatment of the shielding electrode, insulating varnish can also be sprayed to improve the voltage resistance of the product. Although the electric field distribution inside the gas sleeve can be optimize...

Claims

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Application Information

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IPC IPC(8): H01T1/02H01T1/24H01T21/00B05D3/00B05D3/02B05D3/10B05D5/12B05D7/14
Inventor 马斌孟广泽庄奥运刘俊黄从鹏
Owner JIANGSU SHENMA ELECTRIC CO LTD
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