750kV同塔双回输电线路雷击塔顶感应电压的数值计算  

Calculation of Lightning Induced Voltage on 750 kV Double CircuitTransmission Lines on the Same Tower when Lightning Strikes Tower Top

作　　者：高媛[1] 郭洁[1] 雷娟[1] 郭志涛[1] 

机构地区：[1]西安交通大学,西安710049

出　　处：《电瓷避雷器》2007年第3期29-32,共4页Insulators and Surge Arresters

基　　金：国家自然科学基金(No.50577051)

摘　　要：架空输电线路的雷击感应电压计算是电力线路绝缘设计、采取防雷保护措施的基础计算。对雷击750kV同塔双回输电线路塔顶产生感应电压的暂态过程进行了分析,采用电磁场数值分析方法,建立了回击电流模型和线路耦合模型,精确地计算了感应电压值。计算结果表明,感应电压随时间变化非常快,所以在计算雷击塔顶的耐雷水平时,如果把感应电压以一个恒定值的方式计入,必然会产生一定的误差,应该考虑感应电压的暂态过程。Lightning induced voltage on overhead transmission lines is related to the basic calculation of insulation design and lightning protection measure. The author presents analytical expressions for transient process of lightning-induced voltages when lightning strikes the tower top of 750 kV double circuit transmission lines on the same tower. The procedure makes use of a lightning return-stroke model for the calculation of the lightning electromagnetic field and a coupling model already presented in the literature based on the transmission line theory for field-to-overhead line coupling calculations. The result of calculations shows that variation of lightning induced voltage with time is very fast. There is a consequential error if we still regard lightning induced voltage as invariable to calculating of lightning withstand level. So the transient process of lightning induced voltage should be taken into account.

关 键 词：750KV输电线路 感应电压计算 回击模型 耦合模型 

分 类 号：TM863[电气工程—高电压与绝缘技术]