基于3次谐波电流监测相控电抗器匝间短路的方法  

Method of Monitoring Inter-turn Short Circuit for Thyristor Controlled Reactor Based on 3rd Harmonic Current

作　　者：贾跟卯 金山樱 骆福权 胡济成 赵启承 JIA Genmao;JIN Shanying;LUO Fuquan;HU Jicheng;ZHAO Qicheng(Tianjin Jingwei Zhengneng Power Equipment Co.,Ltd,Tianjin 300350,China;Nanjing Electric(Group)Intelligent Power Equipment Co.,Ltd.,Nanjing 210046,China;Electric Power research institute of Zhejiang province Electric power Co.,Ltd.,Hangzhou 310014,China)

机构地区：[1]天津经纬正能电气设备有限公司,天津300350 [2]南京电气(集团)智能电力设备有限公司,南京210046 [3]国网浙江省电力有限公司电力科学研究院,杭州310014

出　　处：《电力电容器与无功补偿》2022年第6期38-44,共7页Power Capacitor & Reactive Power Compensation

基　　金：国家电网公司总部科技项目(5500-202119131A-0-0-00)。

摘　　要：近年来大容量相控电抗器频繁出现匝间短路故障,造成了严重的经济损失及火灾事故。由于输出无功功率受晶闸管阀相位角控制,目前还没有匝间短路故障的可靠及灵敏监测方法。本文通过研究一起33 kV 180 Mvar相控电抗器匝间故障,分析角内、角外3次谐波电流以及有功损耗等特性变化,提出了匝间短路动态仿真模型以及3次谐波电流变化的计算方法,并依据匝间短路必然造成电感显著减小的特性,论证监测角内、角外3次谐波电流显著增大;监测5、7次滤波电容器对3次谐波电流严重放大是识别故障、防止起火燃烧并进行可靠保护的方法。In recent years,a large number of thyristor controlled reactor(TCR)has inter-turn short circuit fault frequently and causes a serious economic loss and fire accidents.At present,there is no reliable and sensitivity monitoring method of inter-turn short circuit fault due to the control of output reactive power by phase angle of thyristor valve.In this paper,such characteristic variation as third harmonic current and active loss inside and outside angle is analyzed through the inter-turn fault of 33kV 180 Mvar thyristor controlled reactor,the inter-turn short circuit dynamic model and the calculation method of third harmonic current are proposed.It is proved that the monitored third harmonic current inside and outside increases significantly in accordance with the characteristic that the inter-turn short circuit causes remarkable decrease of inductance.And monitoring the 5th and 7th filter capacitors to seriously amplify the third harmonic current is the method to identify the fault,prevent fire and perform reliable protection.

关 键 词：相控电抗器 匝间短路 3次谐波 3次谐波放大 

分 类 号：TM47[电气工程—电器]