摘要
主变空载投运时,由于励磁涌流引起差动保护误动作时有发生。结合一起110 kV主变发生因励磁涌流引起的差动保护误动故障,对励磁涌流的特性、保护误动作的原因、整定计算等方面进行了分析,并就如何躲开励磁涌流的影响进行了探讨。
When no-load main transformers are put in operation, misoperation of differential protection often occurs because of excitation inrush current. This paper analyzes the characteristics of excitation inrush cur- rent, misoperation causes of differential protection, setting calculation etc. based on the misoperation of differential protection for the 110 kV main transformer caused by excitation inrush current, and discusses the countermeasures to eliminate the influence of excitation inrush current.
出处
《浙江电力》
2012年第3期16-18,49,共4页
Zhejiang Electric Power
关键词
主变
差动保护
励磁涌流
二次谐波制动
防误动
main transformer
differential protection
excitation inrush current
secondary harmonic restraint
anti-misoperation
