一起电力环网系统中保护配合不当引起保护误动案例分析  

Analysis of a Misoperation Case Caused by Improper Protection Coordination in Power Ring Network System

作　　者：曾伟华 史非 苏建明 ZENG Weihua;SHI Fei;SU Jianming(State Grid Tongling Power Supply Company,Tongling,Anhui 244000,China)

机构地区：[1]国网铜陵供电公司,安徽铜陵244000

出　　处：《东北电力技术》2018年第9期36-38,43,共4页Northeast Electric Power Technology

摘　　要：随着电网的飞速发展,220 kV及以上电力系统基本上都采用电力环网,由于电力环网在系统故障时所呈现出的一些特性,对继电保护有一定的影响,尤其是系统中零负序功率及方向直接影响继电保护的动作行为。在某种条件下,对于高压电力环网系统中220 kV及以上输电线路两侧的纵联保护若配合不当,则极易引起继电保护误动作,给电网带来严重的后果。文中通过一起环网系统中两端保护配合的问题,分析环网系统中区外故障引起线路纵联保护误动的原因。With the rapid development of the power grid and in the power system of 220 thousand volts and above,basically there is a power loop network.when the system fails,some characteristics of the power ring network has a certain influence on the relay protection,especially in system the zero and negative sequence power and direction directly affect the action of relay protection.Under some conditions,if the pilot protection on both sides of the transmission lines above 220 thousand volts and aboveis mismatched,it would be inappropriate for the high voltage power ring network system and would be easy to cause misoperation of relay protection and bring serious consequences to the power grid.Through the cause of maloperation of line pilot protection caused by out of zone fault in a ring network system,this paper analyzes the coordination of ends protection.

关 键 词：电力环网 零负序功率 纵联保护 误动作 

分 类 号：TM711[电气工程—电力系统及自动化]