双回线GIL感应电流快速释放装置控制策略研究  

Control strategy of inductive current rapid release device for GIL with double-circuit lines

作　　者：王玉龙[1,2] 徐渊 赵青春 谈浩[1,2] 徐海洋 张宇驰[1,2] WANG Yulong;XU Yuan;ZHAO Qingchun;TAN Hao;XU Haiyang;ZHANG Yuchi(NR Electic Co.,Ltd.,Nanjing 211102,China;NR Engineering Technology Co.,Ltd..Nanjing 211102,China;Control Center of State Grid Jiangxi Electric Power Co.,Ltd.,Nanchang 300060 China)

机构地区：[1]南京南瑞继保电气有限公司,江苏南京211102 [2]南京南瑞继保工程技术有限公司,江苏南京211102 [3]国网江西省电力有限公司调控中心,江西南昌330006

出　　处：《电力工程技术》2020年第4期127-133,共7页Electric Power Engineering Technology

基　　金：国家电网有限公司总部科技项目(510020191902-0A)。

摘　　要：双回线气体绝缘输电线路(GIL)管廊段内部接地故障时故障点持续的感应电流可能导致管廊击穿。文中分析了双回线GIL管廊段内部产生感应电流、电压的机理和危害,结合双回线GIL管廊安装大差和小差的保护配置特征,提出通过判别GIL管廊段小差的动作行为、线路两侧运行状态和释放装置位置,实现GIL管廊段内部故障断路器切除后经延时感应电流快速释放装置自动合闸的控制策略,避免人工操作合闸。针对释放装置合闸不成功情况,采集故障线路大差保护的选相动作结果判别出故障相合闸失灵情况,提出合闸失灵告警策略和故障相合闸失灵联跳正常运行线的合闸失灵动作策略。根据所提合闸控制策略和合闸失灵策略开发自动控制装置并进行实时数字仿真(RTDS)试验,试验结果表明在不同工况下该控制系统均能可靠动作,从而尽可能地降低感应电流导致GIL管廊击穿的风险。The continuous induced current at the fault point during the internal ground fault of the double circuit line GIL pipe section may cause the pipe gallery to break down. The mechanism and hazards of induced current and voltage in the GIL section of the double circuit line are analyzed. Combining the protection configuration features of check zone and differential zone in the installation of the double-line GIL,the automatic control closing strategy of GIL induced current quick release device is proposed. The method realizes the automatic closing of delayed high speed grounding switch after the circuit breaker cuts off the internal fault of the GIL pipe gallery by discriminating the operation of the line differential protection at the GIL,the operating state of the line and the GIL and the release device position,thereby avoiding manual operation. Aiming at the unsuccessful closing of the release device,the phase selection action results of the check zone protection of the fault line are collected to determine the faulty closing failure condition. The closing failure warning strategy and the closing failure inter-tripping strategy of the healthy line are proposed to reduce risks of GIL breakdown caused by the induced current. And it means to improve the efficiency of the on-site GIL operation and maintenance. The closing failure alarm strategy and the closing failure action strategy of the normal operating line based on the closing failure fault are proposed. According to the proposed closing control strategy and closing failure strategy,automatic control devices are developed and RTDS test is performed. The test results show that the control system can reliably operate under different conditions,and minimize the risk of the induced current breaking through the pipe gallery.

关 键 词：气体绝缘输电线路(GIL) 感应电流 释放装置 合闸控制 失灵 

分 类 号：TM76[电气工程—电力系统及自动化]