STUDYS FOR IDENTIFICATION OF THE INRUSH BASED ON IMPROVED CORRELATION ALGORITHM
LIN Xiang ning 1,2 , LIU Pei 1, YANG Chun ming 2, LIU Shi ming 1,2 (1.Huazhong University of Science and Technology,Wuhan 430074,China; 2.Group of DongFang Electronic Information Technology,Yantai 264001,China)
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.
【CateGory Index】： TM771