Title :
A new method to identify inrush current based on error estimation
Author :
He, Benteng ; Zhang, Xuesong ; Bo, Zhiqian Q.
Author_Institution :
Electr. Eng. Coll., Zhejiang Univ., Hangzhou, China
fDate :
7/1/2006 12:00:00 AM
Abstract :
This paper presents a novel scheme based on error estimation for identification of magnetizing inrush and internal fault conditions in transformers. Because the inrush current is a peaked wave with a dead angle, we can discriminate internal fault current from inrush current by comparing the similarity between the actual wave and two reference waves under two different frequency conditions per half cycle. Experimental results indicate that this technique is effective under different fault conditions, and an operating time of 10-13 ms can be achieved for internal faults in transformers.
Keywords :
fault diagnosis; power transformer protection; 10 to 13 ms; error estimation; inrush current identification; internal fault current identification; magnetizing inrush current identification; transformer; Error analysis; Fault currents; Frequency; Helium; Power system harmonics; Power system protection; Power system relaying; Saturation magnetization; Surge protection; Transformers; Current differential protection; error estimation; inrush current; peaked wave; transformer;
Journal_Title :
Power Delivery, IEEE Transactions on
DOI :
10.1109/TPWRD.2005.861337