零序电流差动保护误动原因分析及改进措施

Erroneous Behavior of Zero Sequence Current Differential Protection——Analysis and Remedy

介绍了嵩屿电厂CD 4型变压器零序电流差动保护装置,分析其在一次区外故障误动的原因,说明零差保护装置整定、调试存在的问题,并提出实际应用中的改进措施。

The paper presents an introduction to CD4 type transformer zero sequence current differential protective devices, analyzes its erroneous reaction during an outregional failure accident, therewith explaining problems that may occur during setting and adjusting the protective installation, simutaneously describing improvements adopted by the power plant.