摘要
电网中线路避雷器故障屡有发生,直接影响线路安全运行。对某220 kV同塔双回线路终端塔避雷器进行了测试及解体分析。试验结果表明,避雷器直流1 mA参考电压、密封性能符合标准要求,局部放电测试未发现明显放电信号,解体后避雷器内部未发现异常放电痕迹,判断Ⅰ回线路避雷器爆炸为避雷器个别性内部缺陷造成,Ⅱ回线路故障放电并非避雷器引起。对线路进站避雷器安装于终端塔上的选型进行了讨论,建议相应避雷器应采用短间隙避雷器。
Line arrester failures frequently occur in the power grid,it directly affecting the safe operation of the line.The lightning arrester for the terminal tower of a 220 kV double-circuit line on the same tower was tested and disassembled.The test results show that the 1 mA DC reference voltage and sealing performance of the arrester meet the requirements of the standard.No obvious discharge signal is found in the partial discharge test.No abnormal discharge traces are found inside the arrester after disassembly.It is judged that the explosion of the arrester in the I circuit is caused by individual internal defects,and II circuit fault discharge is not caused by the arrester.The selection of the lightning arrester installed on the terminal tower of the line inbound is studied,and it is suggested that the corresponding arrester should be a short-gap arrester.
作者
王少华
申剑
李特
周象贤
韩睿
WANG Shao-hua;SHEN Jian;LI Te;ZHOU Xiang-xian;HAN Rui(State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China)
出处
《电工电气》
2021年第1期51-53,64,共4页
Electrotechnics Electric
基金
国网浙江省电力有限公司科技项目(5211DS16002P)。
关键词
避雷器
终端塔
密封性
间隙
arrester
terminal tower
tightness
gap
