35 kV不接地系统开关柜内故障TA饱和波形分析  

Analysis of Fault TA Saturation Waveforms in the Switchgear of 35 kV Ungrounded System

作　　者：张全元 庄进明 亢歆童 ZHANG Quanyuan;ZHUANG Jinming;KANG Xintong(Ultra-high Voltage Company,Hubei Electric Power Co.,Ltd.,Hubei Wuhan 430050,China;Companies,Jiangsu Nantong 226000,China;Wuhan University of Technology,Hubei Wuhan 430070,China)

机构地区：[1]湖北电力有限公司超高压公司,湖北武汉430050 [2]江山化工集团有限公司,江苏南通226000 [3]武汉理工大学,湖北武汉430070

出　　处：《农村电气化》2024年第3期83-85,91,共4页Rural Electrification

摘　　要：电流互感器饱和引起的区内故障拒动、区外故障误动在电网运行中是存在的,发生此类故障对电网和用户的影响比较严重,特别是66 kV及以下电压等级电流互感器,由于制造、成本等原因,TA饱和现象比110 kV以上电压等级普遍。本案例是一110 kV用户35 kV开关柜故障两组35 kV电流互感器先后饱和造成区内故障拒动,区外故障误动,使工厂停产,直到恢复正常供电。Current transformer saturation caused by in-area fault rejection,out-of-area fault misoperation in the operation of the power grid is present,the occurrence of such faults on the grid and the impact on users is also relatively serious,especially 66 kV and below the voltage level current transformer.Due to manufacturing,cost and other reasons,TA saturation phenomenon is more common than 110 kV and above voltage levels.This case are in-zone fault rejection and out-of-zone fault false operation caused by a 110 kV user with 35 kV switchgear fault and two sets of 35 kV current transformers saturated in succession,so that half of the plant shut down until the restoration of normal power supply.

关 键 词：电流互感器 饱和 差动保护 过流保护 拒动 

分 类 号：TM452[电气工程—电器]