浅析异常工况对距离保护的影响  

作　　者：张志峰[1] 桂勇华 张福兴 

机构地区：[1]华自科技股份有限公司,湖南长沙410205

出　　处：《科技风》2021年第23期196-198,共3页

摘　　要：距离保护是110kV及以下等级输电线路继电保护的重要组成部分,在当前复杂的电力网络环境下,对促进电网的安全稳定运行起到了重要的作用。文章通过对线路距离保护在异常工况下的运行状态分析,简述了距离保护的阻抗继电器的工作原理,介绍了PT断线、CT断线、系统振荡以及高阻接地等工况下,保护装置的距离保护可能出现的拒动及误动情况以及成因。同时,结合工程实践经验,针对性提出了一些应用中的处理措施。通过分析,探讨线路距离保护装置实际运行中可能出现故障的分析方法和思路。Distance protection is an important part of relay protection for 110kV transmission lines.In the current complex power network environment,it plays an important role in promoting the safe and stable operation of power grid.Based on the analysis of the operation state of the line distance protection under abnormal conditions,this paper briefly describes the working principle of the impedance relay of the distance protection,and introduces the possible refusal and misoperation of the distance protection of the protection device under the conditions of PT break,CTbreak,system oscillation and high resistance grounding,as well as the causes.At the same time,combined with practical engineering experience,some treatment measures in application are put forward.Through the analysis,this paper discusses the analysis methods and ideas of possible faults in the actual operation of line distance protection device.

关 键 词：距离保护 PT断线 CT断线 系统振荡 

分 类 号：TM7[电气工程—电力系统及自动化]