开关柜套管屏蔽线安装方法的分析
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摘要
在进行35 kV开关柜投运前的带电检测中,发现某开关柜特高频信号异常,暂态地电压、超声波幅值与背景值比较,超过带电检测规程要求,随后对开关柜进行停电解体检查,发现套管屏蔽线过长,触碰到套管内壁,导致在进行工频交流耐压试验中,击穿空气,造成绝缘放电。最后提出了相应的处理措施。
In the live detection of 35 kV switch cabinet before the commission,the ultra high frequency signal was found abnormally,compared with the background value,the transient ground voltage and ultrasonic amplitude value overran those of the requirements of the live detection regulation. Then the switch cabinet was outage and dismantled to be inspected,the casing screening wire was long enough to touch the inner wall of the bushing and lead to the air breakthrough and result in the insulation discharge during the frequency AC withstand voltage test. Finally the corresponding measures were presented.
In the live detection of 35 kV switch cabinet before the commission,the ultra high frequency signal was found abnormally,compared with the background value,the transient ground voltage and ultrasonic amplitude value overran those of the requirements of the live detection regulation. Then the switch cabinet was outage and dismantled to be inspected,the casing screening wire was long enough to touch the inner wall of the bushing and lead to the air breakthrough and result in the insulation discharge during the frequency AC withstand voltage test. Finally the corresponding measures were presented.
引文
[1]气体绝缘金属封闭开关设备局部放电带电测试技术现场应用导则第2部分:特高频法:Q/GDW 11059. 2-2013[S].北京:国家电网公司,2014.
[2]交流金属封闭开关设备暂态地电压局部放电带电测试技术现场应用导则:Q/GDW 11060-2013[S].北京:国家电网公司,2014.
[3]气体绝缘金属封闭开关设备局部放电带电测试技术现场应用导则第1部分:超声波法:Q/GDW 11059. 1-2013[S].北京:国家电网公司,2014.
[4]电力设备局部放电现场测量导则:DL/T 417-2006[S].北京:中华人民共和国国家发展和改革委员会,2014.
[5]周秀,相中华,李秀广,等.宁夏电网GIS常见故障及典型案例分析[J].宁夏电力,2018(3):35-39.
[6]黄兴泉,刘亚辉,李璐. 2009年河南电网GIS设备典型故障及分析[J].河南电力,2011(1):35-39.
[2]交流金属封闭开关设备暂态地电压局部放电带电测试技术现场应用导则:Q/GDW 11060-2013[S].北京:国家电网公司,2014.
[3]气体绝缘金属封闭开关设备局部放电带电测试技术现场应用导则第1部分:超声波法:Q/GDW 11059. 1-2013[S].北京:国家电网公司,2014.
[4]电力设备局部放电现场测量导则:DL/T 417-2006[S].北京:中华人民共和国国家发展和改革委员会,2014.
[5]周秀,相中华,李秀广,等.宁夏电网GIS常见故障及典型案例分析[J].宁夏电力,2018(3):35-39.
[6]黄兴泉,刘亚辉,李璐. 2009年河南电网GIS设备典型故障及分析[J].河南电力,2011(1):35-39.