中文摘要：

YANG Cai-wei 1984- , male, postgraduate, his major research interests are over-voltage protection and grounding technology in power system. E-mail： yangcaiwei9@163.com. SIMA Wen-xia 1965-, female, Ph.D. , professor of The State Key Laboratory of Power Transmission Equipment ＆ System Security and New Technology, Chongqing University. Her major research interests include HV power transmission and transformation technology, external insulation technology and over-voltage in power system. Tel： （023） 65111795-8228; E mail： cqsmwx@cqu. edu. cn YUAN Tao 1976-, male, master, lecturer of The State Key Laboratory of Power Transmission Equipment ＆ System Security and New Technology, Chongqing University. His major research interests are over-voltage protection and grounding technology in power system. E-mail： yuantao_cq@cqu. edu. cn