防雷防冰灾架空地线系统方案研究  

Research on the Scheme of Overhead Ground Wire Lightning Protection and Melting-ice System

作　　者：孔晓峰 方玉群 赵俊杰 陈杰涛 江道灼[2] KONG Xiaofeng;FANG Yuqun;ZHAO Junjie;CHEN Jietao;JIANG Daozhuo(Jinhua Power Supply Company of State Grid Zhejiang Electric Power Company,Zhejiang Jinhua 321000,China;College of Electrical Engineering,Zhejiang University,Hangzhou 310027,China;Hangzhou Power Supply Company of State Grid Zhejiang Electric Power Company,Hangzhou 310009,China)

机构地区：[1]国网浙江省电力公司金华供电公司,浙江金华321000 [2]浙江大学电气工程学院,杭州310027 [3]国网浙江省电力公司杭州供电公司,杭州310009

出　　处：《高压电器》2021年第7期154-161,共8页High Voltage Apparatus

摘　　要：针对架空地线防雷机理与通流融冰时的"脱地"绝缘要求,提出一种新型的防雷防冰灾架空地线系统方案,该系统由具有4层(或3层)结构的新型架空地线及其辅助接地设备构成,既可解决架空地线在冬季覆冰时的"脱地"通流加热融冰问题,又能改善其防雷性能。以某220 kV架空线路为例,对其分别采用传统架空地线与新型防雷防冰灾架空地线系统,在ATP-EMTP上进行建模仿真对比研究防雷效果,结果表明:新型防雷防冰灾架空地线系统能够明显降低地线上的直击(或感应)雷过电压上升率及幅值,从而有效提高架空地线的防雷效果。此外,基于传统架空地线最小融冰电流研究结果,根据"导线外表面积相同时所需的最小融冰热容量一样"的原则,推导并给出了新型架空地线最小融冰电流计算方法。According to the lightning protection mechanism and the requirement of"off-ground"insulation of overhead ground wire,a new scheme of overhead grounding wire lightning protection and melting-ice system is proposed.The system consists of a new type of overhead ground wire with four(or three)layers and its auxiliary grounding equipment.And it can not only solve the problem of"off-ground"current heating of the overhead ground wire during ice coating in winter,but also improve its lightning protection performance.Taking a 220 kV overhead line as an example,the traditional overhead ground wire and the new lightning protection and melting-ice overhead ground wire system are used respectively.The two schemes are modeled on ATP-EMTP to compare their lightning protection effects.The simulation results show that the new lightning protection and melting-ice overhead ground wire system can significantly decrease the direct attack(or induction)lightning overvoltage rise rate and amplitude on the ground line,thus effectively improving the lightning protection effect of the overhead ground wire.In addition,based on the research results of the minimum ice-melting current of the traditional overhead ground wire,according to the principle of"the same minimum ice-melting heat capacity required when the outer surface area of the wire is the same",the calculation method of the minimum ice-melting current of the new overhead ground wire is derived.

关 键 词：架空地线 热力融冰 防雷仿真 ATP-EMTP 

分 类 号：TM752[电气工程—电力系统及自动化]