Decomposed Gases Generated by Partial Discharges at Floating Potential Defects in SF<sub>6</sub> Gas Transformers

MA Chenxi; QIAO Shengya; ZHOU Wenjun; ZHENG Yu; YU Jianhui

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Decomposed Gases Generated by Partial Discharges at Floating Potential Defects in SF₆ Gas Transformers

更新时间：2025-12-08

- Decomposed Gases Generated by Partial Discharges at Floating Potential Defects in SF₆ Gas Transformers
- Vol. 46, Issue 11, Pages: 4052-4060(2020)
- 作者机构：
  
  1. 武汉大学电气与自动化学院
  2. 广东电网有限责任公司广州供电局
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 November 2020，
  
  Published：2020
- 稿件说明：
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MA Chenxi, QIAO Shengya, ZHOU Wenjun, et al. Decomposed Gases Generated by Partial Discharges at Floating Potential Defects in SF₆ Gas Transformers[J]. 2020, 46(11): 4052-4060.
DOI：

MA Chenxi, QIAO Shengya, ZHOU Wenjun, et al. Decomposed Gases Generated by Partial Discharges at Floating Potential Defects in SF₆ Gas Transformers[J]. 2020, 46(11): 4052-4060. DOI：

摘要

为研究气体绝缘变压器中SF

在局部放电下的分解特性

建立了SF

分解试验平台

设计了变压器绕组缩比模型及由金属颗粒堆积引起的悬浮电位缺陷模型

分别在不同外施电压以及含水量下进行放电分解试验。试验结果表明

在340～1 500 p C的低强度局部放电试验中

典型分解产物有SO

、SOF

、CO和CF

其产气速率关系为:SOF

>SO

>CO>CF

。SOF

与SO

体积分数的比值φ（SOF

）/φ（SO

）随时间增长而趋于稳定且放电强度越强

稳定值越小。此外在过量水分的环境下(体积分数为2 143×10

-6

、4 000×10

-6

)

水分会加速局部放电的发展

同时促进SO

的生成。因此可以利用典型分解产物的种类、体积分数变化规律作为判断局部放电强度的特征量。

Abstract

In order to study the decomposition characteristics of SF

under partial discharges in SF

gas insulation transformers

an experimental platform which consists of a transformer winding and the reduced-scale model of floating potential defects was constructed.Partial discharge tests were carried out under different test voltages and moisture levels.The results show that in the low-intensity partial discharge tests of 340～1 500 pC

the typical decomposition products are SO

SOF

CO and CF

among which the formation rate is in

the order SOF

>SO

>CO>CF

.The ratio of the volume fraction of SOF

to that of SO

tends to be stable with time

and the stronger is the discharge intensity

the smaller the stability will be.In the environment of excessive moisture(volume fraction is 2 143×10

-6

and 4 000×10

-6

)

the development of partial discharge is faster which promotes the generation of SO

.Therefore

the type of typical decomposition products and the variation law of volume fraction can be used to assess the strength of partial discharge.

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Related Institution

State Key Laboratory of Electrical Insulation and Power Equipment, Xi’an Jiaotong University

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School of Electrical Engineering, Wuhan University

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Decomposed Gases Generated by Partial Discharges at Floating Potential Defects in SF6 Gas Transformers

DOI：

摘要

Abstract

关键词

Keywords

references

Decomposed Gases Generated by Partial Discharges at Floating Potential Defects in SF₆ Gas Transformers