超（特）高压串联补偿控制保护系统与线路保护接口方案

超高压串联补偿（以下简称串补）装置在国内应用时间相对较短,在实践中其与线路保护接口策略方面暴露出的一些问题值得改进。结合超（特）高压电网现状,探讨串补自动重投与线路重合闸配合方案。针对某特高压变电站高压电抗器保护和失灵保护不能退出本站串补装置问题,提出断路器操作箱三相跳闸接点启动退出串补方案和线路保护收远传开关量输入信号启动退出串补方案;并针对目前存在的串补热备用时线路单相瞬时故障串补自动重投问题,提出将线路过电压远传功能集成于线路保护装置的构想,引入全新的“线路失灵”保护理念,并提出一种全新的串补型线路保护方案。

Investigations on Interface Program of Series Capacitors's Control & Protection System and Line Protection System in an EHV (UHV) Transmission Engineering

EHV series capacitors have been applied for a relatively short time in the domestic market, it is worthy to investigate problems existed in the interface of its control and protection with transmission line protection, which was exposed by engineerings. So the coordination logic between re-entering of series capacitors and reclosing of transmission lines in a power grid of EHV or UHV is analyzed. To solve the problem that series capacitors can not be quitted by local shunt reactor protection or local trip failure protection, some improved programes are proposed that series capacitors can be quitted both by 3-phase tripping contactors and distant-breakers tripping signals received by transmission line protection. To solve the problem that series capacitors in hot standby may be re-entered unexpectedly by transmission line protection when a single phase earth fault occurs, the idea of integrating overvoltage and distant-breakers tripping protection into transmission line protection is proposed. The idea of transmission line trip-failuer protection, as well as a new series- capacitor based transmission line protection, are put forward firstly.