一起10kV避雷器击穿与互感器烧毁故障原因分析  

Cause Analysis of a 10 kV Surge Arrester Breakdown and Transformer Burnout Fault

作　　者：庄飞虎 马金财 何龙 王清彬 李勇 吴伟丽 刘俊 ZHUANG Feihu;MA Jincai;HE Long;WANG Qingbin;LI Yong;WU Weili;LIU Jun(State Grid Xinjiang Electric Power Co.,Ltd.,Changji Power Supply Company,Changji 831100,China;Xi'an University of Science&Technology,School of Electrical and Control Engineering,Xi'an 710054,China;Anhui Zhengguang Television Power Technology Co.,Ltd.,Hefei 230088,China)

机构地区：[1]国网新疆电力有限公司昌吉供电公司,新疆昌吉831100 [2]西安科技大学电气与控制工程学院,西安710000 [3]安徽正广电电力技术有限公司,合肥230000

出　　处：《电瓷避雷器》2022年第6期8-14,129,共8页Insulators and Surge Arresters

基　　金：新疆电力公司科技项目(编号:XJKE20191203)。

摘　　要：针对某110kV变电站多次发生10kV侧互感器烧损事故,并伴随避雷器绝缘炸裂,结合其中一次事故现场分析与试验测定数据,初步推测为铁磁谐振故障,为了进一步探明在加装消谐装置情况下仍然烧毁互感器的原因,利用ATP-EMTP软件搭建了仿真模型,分别模拟了单相接地故障、铁磁谐振过电压故障和间歇性弧光接地与铁磁谐振过电压混合故障等情况,并与后台故障录波数据对比,复现了故障过程,最终分析出其中一条出线持续接地造成系统间歇性弧光接地过电压,所产生的过电流又诱发持续的铁磁谐振是造成互感器烧损的主要原因,并给出了相关建议。In view of the fact that the transformer on the 10kV side is burned out many times in a 110kV substation,and the surge arrester insulation is cracked.Based on the field analysis and test data of one of the accidents,it is preliminarily speculated that it is ferromagnetic resonance fault.In order to further explore the reason why the transformer is still burned out under the condition of installing harmonic elimination device,the simulation model is built by using ATP-EMTP software,and the single-phase connection is simulated respectively ground fault,ferromagnetic resonance overvoltage fault and intermittent arc grounding and ferromagnetic resonance overvoltage mixed fault,and compared with background fault recording data,the fault process is reproduced.Finally,it is analyzed that the continuous grounding of one of the outgoing lines causes intermittent arc grounding overvoltage,and the resulting over-current induces continuous ferromagnetic resonance,which is the main cause of transformer burning.The reasons and suggestions are given.

关 键 词：避雷器击穿 弧光接地 过电压 铁磁谐振 

分 类 号：TM862[电气工程—高电压与绝缘技术] TM451