摘要
介绍了一起变电站主变差动保护误动作原因的分析与处理过程。厂家和电力公司技术人员在变电站对差动保护设备进行了详细检查,并结合保护动作数据,对跳闸事故进行了缜密分析,发现引起主变保护误动作的原因如下:(1)电流相序为负相序;(2)高压侧电缆绝缘有问题;(3)回路极性接反。然后采取了针对性的措施,排除了缺陷和隐患,保证了该地区电网的稳定运行。
This paper introduces the analysis and fault finding of a differential relay false tripping of the main transformer in a substation. Technicians checked differential relay of substation, analyzed wave recording data, and finally found some defects and hidden trouble which affected the safe operation of the power system. Namely, current phase sequence was reverse sequence, cables insulation of high side was in trouble, and current polarity was wrong. It also takes some measures to eliminate the defects in the operation, which can ensure the safe and stable operation of power system.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第5期127-131,共5页
Power System Protection and Control
关键词
差动保护
不平衡电流
负序系统
differential relay
unbalanced current
negative sequence system
