单相接地故障引起PT柜电压互感器问题的分析  

Analysis of Burning of Voltage Transformer in PT Cabinet Caused by Single-phase Grounding Fault

作　　者：李克 LI Ke(XJ Delishier Electric Co.,Ltd.,Henan 461000,China)

机构地区：[1]许继德理施尔电气有限公司,河南461000

出　　处：《集成电路应用》2022年第8期60-62,共3页Application of IC

摘　　要：为研究单相接地故障对PT柜电压互感器的影响,阐述一起运行中的10kV PT柜电压互感器烧毁事故为研究对象,对中性点不接地系统单相接地故障路进行理论推导,得出单相接地故障是PT柜电压互感器烧毁的主要原因,通过PT柜电压互感器烧毁实例,验证了铁磁谐振和冲击电流会使电压互感器烧毁,从而导致电力事故。In order to study the influence of single-phase grounding fault on the voltage transformer of PT cabinet, this article takes a 10 kV PT cabinet voltage transformer burnout accident as the research object, and theoretically derives the single-phase grounding fault circuit of the neutral point ungrounded system. and draw the main reason that single-phase grounding fault causes the voltage transformer of PT cabinet to burn out. The reasons are the occurrence of single-phase grounding fault and the ferromagnetic generated during the disappearing process. and finally through the PT cabinet voltage transformer burnout example, it is verified that the ferromagnetic resonance and the inrush current will cause the voltage transformer to burn out, resulting in an electrical accident.

关 键 词：PT柜 电压互感器 单相接地故障 铁磁谐振 冲击电流 

分 类 号：TM451[电气工程—电器]