某110kV智能变电站一次主变跳闸动作分析

Analysis of Main Transformer Tripping in a 110 kV Intelligent Substation

文章介绍了主变差动保护异常跳闸现象。对可能影响主变差动保护动作跳闸条件进行了梳理,结合微机主变差动保护躲励磁涌流的常用措施,找出了该主变差动保护A套动作跳闸及B套保护闭锁不动作的原因。结合现场检查处理情况针对本次主变两套差动保护跳闸不一致的原因提出了整改的措施,避免类似故障再次发生。

This paper introduces the abnormal tripping of the differential protection of main transformer and discusses the tripping conditions that may affect the differential protection of main transformer.Considering the common measures of the differential protection of main transformer to avoid the inrush current of excitation,the paper finds out the reason why the A set of differential protection trips but the B set of differential protection does not.Based on the on-site inspection and treatment,it puts forward corrective measures against inconsistent tripping to prevent similar faults from happening again.