摘要
绝缘子表面高压电极故障所导致的局部放电是气体绝缘组合电器(gas insulated switchgear,GIS)设备内部较为常见一种放电。为实现GIS设备中绝缘子表面高压电极故障局部放电严重程度的诊断与评估,建立了一套220kV GIS设备局部放电缺陷发展的试验平台,采用逐步升压法对绝缘子表面高压电极故障所导致的局部放电进行了长期试验,观察到了放电起始、发展直到沿面闪络的现象,获得了不同试验阶段的趋势图、散点图、二维柱状图、灰度图、时频分析图等多种统计谱图。研究结果表明:1)可以将GIS设备绝缘子表面高压电极故障导致局部放电的放电严重程度划分为3个级别:轻微放电、中度放电以及危险放电;2)随着局部放电的加剧,放电点沿相位的分布逐渐变宽,并且散点图、柱状图、灰度图以及时频分析图等统计谱图的形貌特征出现相应的变化。利用上述局部放电相位分布特点以及多种统计谱图的形貌特征可以作为GIS设备绝缘子表面高压电极故障导致局部放电严重程度诊断与评估的依据。
We designed a scheme to diagnose and assess the severity levels of the partial discharge （PD） provoked by high-voltage electrode defect on GIS insulator surface. With the application of gradually increased voltage, long-term tests were conducted on a well-established 252 kV GIS experiment platform to observe the entire evolution process of partial discharge from its very initiation till the eventual flashover. Real-time measurement was also undertaken during the tests to capture the trend curve of partial discharge as a result of test time, the scatter plot, histogram, grey-scale map, and the time-frequency map of the partial discharge. The results indicate that, 1 ） partial discharge initiated by high-voltage electrode defect in GIS can be classified into three severity levels, namely, petty discharge, medium discharge, and threatening discharge; 2 ） as partial discharge exacerbates, the phase distribution widens gradually, and corresponding shape changes occur in the scatter plot, histogram, grey-scale map, and the time-frequency map. It is suggested that the features of phase distribution and the corresponding spectra can be used as important criterion in diagnosing and assessing the severity levels of the partial discharge triggered by high-voltage electrode defect on GIS insulator surface.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第7期1719-1727,共9页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724508)~~
