基于不平衡电压的相控电抗器匝间短路故障保护方法  

Unbalanced Voltage Based Protection Method for Inter-turn Short-circuit Fault of Phase-controlled Reactor

作　　者：陈辉 黄鑫[1] 张磊[1] 周启文[1] 李成博[1] CHEN Hui;HUANG Xin;ZHANG Lei;ZHOU Qiwen;LI Chengbo(NR Electric Co.,Ltd.,Nanjing 211102,China)

机构地区：[1]南京南瑞继保电气有限公司,江苏省南京市211102

出　　处：《电力系统自动化》2021年第24期158-164,共7页Automation of Electric Power Systems

摘　　要：相控电抗器在结构上属于干式空心电抗器,工作时其电流会随着相控触发角的变化而变化,其等效阻抗也随之变化。常规干式空心电抗器的匝间短路保护针对恒定阻抗的电抗器设计实现,并不适用于相控电抗器。文中提出一种相控电抗器匝间短路故障保护方法。首先,根据相控电抗器的接线和工作特性,得到两个电抗器之间的不平衡电压;然后,采用滑动数据窗积分的方式计算其不平衡电流;最后,基于差动保护的原理实现了匝间短路故障的判断。所提方法消除了晶闸管触发角对匝间短路故障判据的影响。基于实际工程参数的实时数字仿真结果验证了所提方法的有效性。Phase-controlled reactor belongs to dry-type air-core reactor in structure.During operation,its current will change with phase control trigger angle,and its equivalent impedance also changes.The inter-turn short-circuit protection of the conventional dry-type air-core reactor is designed and implemented for the constant impedance reactor,which is not suitable for phase-controlled reactor.This paper presents an inter-turn short-circuit fault protection method for the phase-controlled reactor.First,according to the wiring and working characteristics of phase-controlled reactors,the unbalanced voltage between the two reactors is obtained.Then,the unbalanced current is calculated by sliding data window integration.Finally,based on the principle of differential protection,the judgment of inter-turn short-circuit fault is realized.The proposed method eliminates the influence of thyristor trigger angle on inter-turn short-circuit fault criterion.Real-time digital simulation results based on actual engineering parameters verify the effectiveness of the proposed method.

关 键 词：相控电抗器 匝间短路保护 不平衡电压 差动保护 触发角 

分 类 号：TM47[电气工程—电器]