基于虚拟零序电流的双回线接地距离保护原理  

A novel scheme of ground distance protection for double circuit line based on virtual zero sequence current

作　　者：张洋[1] 王伟 樊占峰 

机构地区：[1]华北水利水电学院,河南郑州450011 [2]许继日立公司,河南许昌461000 [3]许继电气股份有限公司,河南许昌461000

出　　处：《电力系统保护与控制》2011年第21期55-59,共5页Power System Protection and Control

摘　　要：提出了一种采用虚拟零序电流方法,解决平行双回线、同杆并架双回线,一回线上发生接地故障时母线电压受两回线零序电流影响,接地距离继电器测量不正确的问题。该方法不引入相邻线零序电流,不增加交流输入及连线,比引入相邻线零序电流补偿的方法,在不同故障点具有更好的自适应性的优点。数字仿真结果表明:该方法可适用于具有相邻线互感的平行双回线、同杆并架双回线的高压输电线路。In this paper, a new scheme using virtual zero sequence current of non-fault line is presented. This scheme can solve the problem that the ground distance relay can not measure the accurate fault distance. Because busbar voltage is influenced by zero current of neighborhood line when ground fault happened in one line of parallel double circuit line or double circuit line on the same tower. Under the condition of no using neighborhood current and extra AC input and connect line, the paper analyzes that this scheme is more adaptive in different faults than the neighboring zero current compensation scheme. The digital simulation result indicates that the scheme can be correctly used in high voltage transmission lines of parallel double circuit line and double circuit line on the same tower.

关 键 词：虚拟零序电流 平行双回线 同杆并架双回线 互感 

分 类 号：TM773[电气工程—电力系统及自动化]