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.
作者
陈天英
CHEN Tianying(Electric Power Research Institute of State Grid Hebei Electric Power Co.,Ltd.,Shijiazhuang,Hebei 050021,China)
出处
《东北电力技术》
2021年第4期49-51,62,共4页
Northeast Electric Power Technology
关键词
电压互感器
一次绕组
差动保护
变压器
voltage transformer
primary winding
differential protection
transformer
