摘要
利用输电线路雷电屏蔽电气几何模型(EGM),通过几起负保护角500kV超高压架空输电线路绕击跳闸的事故实例,分析事故发生原因,说明在山腰、山顶、山脊等地形,负保护角依然不能有效防护雷电绕击,同时得出关于各地形绕击发生条件的一些结论,并探讨了加强山坡地绕击跳闸事故的防护措施.
Using the Electrical-Geometric Model of transmission line lightning shield (EGM), this paper analyzes the cause of some shielding trip cases on EHV 500 kV overhead transmission lines.The analysis points out that negative shielding angles can not prevent lightening shielding failure on mountainside,hilltop and ridges.The paper also comes up with some conclusions about the conditions for shielding failure on various landforms. Lastly, this paper discusses strengthening protection for shielding-trip accidents on hillside.
出处
《泉州师范学院学报》
2014年第2期92-95,共4页
Journal of Quanzhou Normal University
关键词
500
KV
负保护角
绕击模型
击距
500 kV
negative shielding angle
shielding model
striking distance