零序互感对距离保护的影响与自适应补偿方法  

Impact of zero sequence mutual inductance on distance protection and its adaptive compensation method

作　　者：张洪喜[1] 徐晓春[1] 谢华[1] 黄涛[1] 徐海洋 ZHANG Hongxi;XU Xiaochun;XIE Hua;HUANG Tao;XU Haiyang(NR Electric Co.,Ltd,Nanjing 211102)

机构地区：[1]南京南瑞继保电气有限公司,南京211102

出　　处：《电气技术》2025年第1期56-63,共8页Electrical Engineering

基　　金：国家电网有限公司科技项目(5100-202255005A-1-1-ZN)。

摘　　要：针对一起同塔双回线发生跨线接地故障时欠范围纵联距离保护拒动事件,本文分析同塔双回线单相接地故障与跨线接地故障的特征,以及零序互感对接地距离保护的影响,得出零序互感带来的附加阻抗是引起接地距离保护范围缩小并导致欠范围纵联距离保护拒动的根本原因。为避免零序互感对同塔双回线接地距离保护范围的影响,须对零序互感进行补偿,因此本文提出一种自适应补偿方法,通过引入邻线零序电流,结合本线零序电流方向和相电流方向,实现对零序互感的自适应补偿。最后,利用实时数字仿真系统对本文所提补偿方法进行评估,仿真结果证明了所提方法的有效性。This article analyzes the characteristics of single phase grounding faults and cross line grounding faults in the same tower double circuit line,as well as the impact of zero sequence mutual inductance on grounding distance protection,in response to the misoperation fault of under range longitudinal distance protection during a cross line grounding fault on the same tower double circuit line.It is concluded that the additional impedance caused by zero sequence mutual inductance is the fundamental reason for the reduction of grounding distance protection range and the refusal of protection.In order to solve the problem,an adaptive zero sequence mutual inductance compensation method is proposed.The new method based on the adjacent zero sequence current injection and local auxiliary judgement can enable the compensation adaptively.The performance of the proposed method is evaluated based on the real time digital simulation system,and results show that this method is valid.

关 键 词：零序互感 跨线故障 距离保护 自适应补偿 5G通信 

分 类 号：TM773[电气工程—电力系统及自动化]