一起线路单相接地导致变压器间隙零序动作事故的分析  

Analysis of Zero-sequence Action Accident of Transformer Gap Caused by Single-phase Grounding of a Line

作　　者：严文洁 罗皓文 严文帅 易梦玲 柏小丽 YAN Wenjie;LUO Haowen;YAN Wenshuai;YI Mengling;BO Xiaoli(SGCC Jingmen Power Supply Company,Jingmen 448000,China;Wuhan Donghu University,Wuhan 430212,China;SGCC Luzhou Power Supply Company,Luzhou 646000,China)

机构地区：[1]国网湖北省电力公司荆门供电公司,湖北荆门448000 [2]武汉东湖学院,湖北武汉430212 [3]国网四川省电力公司泸州供电公司,四川泸州646000

出　　处：《技术与市场》2019年第10期7-9,共3页Technology and Market

摘　　要：介绍一起线路单相接地故障导致1台变压器高后备间隙零序过流过压动作,跳开主变三侧开关的事故。通过分析现场事件报文记录的时序关系,比对故障发生前后保护装置的运行情况,深入分析了零序电压频率变化对末端110kV系统的影响。针对存在10kV分布式电源的变电站,给出了相应的防范措施。This paper introduces an accident in which the single-phase grounding fault of the line leads to zero-sequence over-current and over-voltage action of one transformer high backup gap and jumps off the main-side three-side switch.By analyzing the timing relationship of the on-site event message records,and comparing the operation of the protection device before and after the fault,the influence of the zero-sequence voltage frequency variation on the end 110 kV system is analyzed in depth.For the substation with 10 kV distributed power supply,corresponding preventive measures are given.

关 键 词：主变保护 间隙零序 零序电压频率 末端110kV系统 

分 类 号：TM407[电气工程—电器]