A NEW METHOD TO IDENTIFY INRUSH CURRENT BASED ERROR ESTIMATION
ZHANG Xue-song,HE Ben-teng(Zhejiang University, Hangzhou 310027, Zhejiang Province, China)
A novel scheme is proposed, which is based on error estimation for identification of magnetizing inrush and internal fault conditions in transformers. Because the inrush current is a peaked wave with dead angle, we can discriminate the internal fault current from inrush current by comparing the similarity between actual wave and two reference waves under two different frequency conditions in half cycle. Experiment results indicate that this technique is effective under different fault conditions, and the action speed can reach 10~13ms when internal faults happens in transformers.
【CateGory Index】： TM41