66kV所用变绝缘击穿事故分析与防范措施  

Analysis and precautionary measure of a 66kV Substation Transformer Insulation Breakdown

作　　者：王翼[1] 刘志同[2] 赵强[1] 宋沅林 胡煜天 WANG Yi LIU Zhi-tong ZHAO Qiang SONG Yuan-lin HU Yu-tian(State Grid Fushun Power Supply company,Fushun 113008 State Grid Shenyang Power Supply company, Shenyang 110100, Liaoning Province)

机构地区：[1]国网抚顺供电公司,辽宁抚顺113008 [2]国网沈阳供电公司,辽宁沈阳110100

出　　处：《沈阳工程学院学报（自然科学版）》2016年第4期345-348,361,共5页Journal of Shenyang Institute of Engineering:Natural Science

摘　　要：对一起66 kV所用变压器(以下简称所用变)绝缘击穿事故进行分析,当雷电波沿线路到达处于断开的开关时,雷电波将发生2倍的全反射,使雷电过电压升高2倍,使开关或与开关邻近的设备对地击穿放电。该所用变安装在避雷器与所用变之间,所用变将承受2倍避雷器残压的作用,结合实际经验提出了采用避雷器进行"零"距离保护的防范措施。It is known that double total reflection will occur and the lightning over-voltage increase by 2 times when the lightning wave reaches to the disconnect switch along the line. In the 66 kV station transformer insulation breakdown accident,the transformer was installed between an arrester and a switch,and 2 times arrester residual voltage was put on the transformer led to the transformer breakdown when a lightning strike happened.In this paper,the arrester Zero distance protection was proposed as an effective precautionary measure based on the practical experience.

关 键 词：变压器 绝缘 波反射 避雷器 

分 类 号：TM862[电气工程—高电压与绝缘技术]