摘要
提出了一种基于相关分析的变压器励磁涌流识别判据 ,该判据通过改进的最大面积法重组一周波数据窗内的采样信号 ,通过比较其前后半周波波形的相关性来区分励磁涌流和故障电流。仿真和动模试验表明 ,该判据能正确识别各种情况下产生的励磁涌流 ,在变压器带长线发生内部故障、内部故障与励磁涌流并存及CT特性较差的情况下 ,仍能快速正确地启动出口动作 ,具有较好的鲁棒性。该方法算法简单 。
A new scheme based on improved correlation algorithm to distinguish between inrush and internal fault occurred in the transformer is proposed.In this scheme,the post fault current of each phase in one cycle is reorganized as a new measurand. Thereby, fault currents can be distinguished from the inrushes if the improved correlation coefficient between the pre half and the post half cycle of the measurand is larger than the setting value.Test results show that all types of internal faults even accompanied by magnetizing inrush can be correctly identified from the inrush with the proposed algorithm. Besides with high reliability , this scheme has satisfying sensitivity. Furthermore, this algorithm can be easily implemented in the real time process.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2001年第5期56-60,70,共6页
Proceedings of the CSEE
关键词
励磁涌流
改进型波形相关法
鉴别
变压器
差动保护
transformer differential protection
internal fault
inrush
improved waveform correlation algorithm
