220 kV电压互感器GIS放电引起主变跳闸故障的分析  

Fault Analysis of Main Transformer Trip Caused by GIS Discharge of 220 kV Voltage Transformer

作　　者：陈天英 CHEN Tianying(Electric Power Research Institute of State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang,Hebei 050021,China)

机构地区：[1]国网河北省电力有限公司电力科学研究院,河北石家庄050021

出　　处：《东北电力技术》2021年第4期49-51,62,共4页Northeast Electric Power Technology

摘　　要：介绍一起电压互感器GIS放电引起主变压器(以下简称主变)跳闸故障,根据故障发生时主变三相电压电流变化及保护动作情况,对差动保护范围内设备试验测试推测可能的故障原因,然后通过电压互感器解体检查分析,确定故障原因为一次绕组焊接不当,造成匝间放电,最后针对本次故障提出合理化建议,确保电压互感器安全稳定运行。It introduces a main transformer tripping fault caused by a voltage transformer GIS discharge.According to the main transformer three-phase voltage and current changes and protection action when the fault occurs,the possible causes of the fault are speculated for the equipment test in the differential protection range.Then through the voltage transformer disassembly inspection and analysis to determine the cause of the failure,it is improper welding of the primary winding causing inter-turn discharge.Finally it puts forward reasonable suggestions for this failure to ensure the safe and stable operation of the voltage transformer.

关 键 词：电压互感器 一次绕组 差动保护 变压器 

分 类 号：TM451[电气工程—电器]