750kV输电线路系统特性对线路保护的影响

摘要

根据西北电力公司提供的750 kV系统参数,通过中国电科院对宁夏750 kV系统的动模试验,分析750 kV特高压输电线路的电容电流、暂态过程、过渡电阻、空载合闸充电、重负荷及空载、大短路电流对线路保护的影响,为750 kV系统输电线路保护解决这些问题提供了依据,对特高压线路保护装置提供一定的帮助和指导。%Based on 750 kV power system parameters provided by Northwest China Electric Power Corporation and dynamic simulation project offered by Electric Power Research Institute,the paper analyzes the influences of 750kV UHV transmission line on line protection.It includes capacitance current,transient state process,transition resistance,connecting unloaded line to system,heavy load,idle load and heavy short circuit current.Evidences have been provided by the essay for solving these problems.The paper also supplies some assistances and advices to the protectors of EHV transmission line.