高电压技术2012，Vol.38Issue(4)：863-870,8.
耦合地线架设位置及根数对500/220kV同塔4回线路防雷特性影响
Influence of Mounting Location and Number of Coupling Ground Wires on Characteristic of Lightning Protection for 500/220kV Quadruple-circuit Transmission Line on Same Tower
摘要
Abstract
Mounting coupling ground wire is an effective lightning protection measure to reduce trip-out rate of back flashover,however,various mounting positions of coupling ground wire have different impacts on the lightning protection characteristics of transmission lines,especially the multi-circuit lines.We compared their protecting effect of setting single or two grounding wires in the middle of cross-arms at different heights,and analyzed the effects of mounting coupling ground wire on the center of different cross-arm aimed at 500/220 kV quadruple-circuit transmission lines.Moreover,in order to explore the mechanism of coupling grounding wires improving the protection characteristics in transmission lines,we compared and discussed the shunt coefficients of tower,ground wire and coupling ground wire and the coupling coefficient in the condition of various mounting positions.The results indicate that the effect of protecting conductor wire is better when the coupling ground wire is closer to the conductor.The shunt coefficient of single coupling ground wire can reach 2%~7%,and the shunt coefficient of double coupling ground wires can reach 5%~14%.Mounting coupling grounding wires can effectively increase the coupling coefficient.关键词
耦合地线/反击耐雷水平/分流系数/耦合系数/同塔4回线路/混压Key words
coupling ground wire/lightning withstand level/shunt coefficient/coupling coefficient/quadruple-circuit transmission line on the same tower/mixed voltage class分类
信息技术与安全科学引用本文复制引用
王希,李振,彭向阳,李志峰,何金良..耦合地线架设位置及根数对500/220kV同塔4回线路防雷特性影响[J].高电压技术,2012,38(4):863-870,8.基金项目
国家自然科学基金 （）
国家重点基础研究发展计划（973计划） （）
