基于励磁涌流对零序差动极性分析的应用  

Application of Zero Sequence Differential Polarity Analysis Based on Excitation Inrush Current

作　　者：李琛 LI Chen(Liaoning Dongke Electric Power Co.,Ltd.,Shenyang,Liaoning 110179,China)

机构地区：[1]辽宁东科电力有限公司,辽宁沈阳110179

出　　处：《东北电力技术》2025年第2期31-33,共3页Northeast Electric Power Technology

摘　　要：单相接地短路是220~500 kV变压器的主要故障形式之一。与相间纵差保护相比,零序差动保护对于变压器内部发生的单相接地故障具有更高的灵敏度,因此如何准确检验零序电流互感器的极性逐渐成为现场技术人员关注的焦点。以某海外项目工程为例,详细分析了通过励磁涌流校验零序差动保护极性的应用过程,对现场判别零序差动保护极性提供一定参考。Single-phase grounding short-circuit is one of the main fault forms of 220~500 kV transformers.Compared with the phase-to-phase differential protection,the zero sequence differential protection has higher sensitivity to the single-phase grounding fault that occurs inside the transformer.Therefore,how to accurately check the polarity of the zero sequence current transformer gradually be-comes the focus of on-site engineers.Taking an overseas project as an example,it analyzes in detail the application process of chec-king the zero sequence differential protection through excitation inrush current,and provides a guiding basis for judging the polarity of zero sequence differential protection on site.

关 键 词：海外工程 励磁涌流 零序差动保护 极性校验 

分 类 号：TM711[电气工程—电力系统及自动化]