DocumentCode :
1195841
Title :
A Morphological Scheme for Inrush Identification in Transformer Protection
Author :
Lu, Z. ; Tang, W.H. ; Ji, T.Y. ; Wu, Q.H.
Author_Institution :
Dept. of Electr. Eng. & Electron., Univ. of Liverpool, Liverpool
Volume :
24
Issue :
2
fYear :
2009
fDate :
4/1/2009 12:00:00 AM
Firstpage :
560
Lastpage :
568
Abstract :
This paper presents a novel morphological scheme for the identification of transformer magnetizing inrush. The scheme decomposes a current signal into multiresolution levels based on synthesis and analysis operators of mathematical morphology. It is able to discriminate between inrush and internal fault currents even in the case of an inrush with a low second harmonic component and an internal fault current with a high second harmonic component. Simulation studies have been undertaken to evaluate the scheme based on a three-phase high-voltage power transformer operating under different conditions, which is simulated with an alternative transients program. The testing results show that the proposed scheme is able to identify inrush currents reliably and provides an alternative solution for transformer differential protection.
Keywords :
fault currents; mathematical morphology; transformer protection; alternative transients program; inrush identification; inrush magnetization; internal fault current; low second harmonic component; mathematical morphology; three-phase high-voltage power transformer; transformer differential protection; Circuit faults; Current measurement; Fault currents; Power system harmonics; Power system protection; Power system relaying; Power system reliability; Power transformers; Protective relaying; Surge protection; Inrush current; morphological decomposition scheme (MDS); power transformer;
fLanguage :
English
Journal_Title :
Power Delivery, IEEE Transactions on
Publisher :
ieee
ISSN :
0885-8977
Type :
jour
DOI :
10.1109/TPWRD.2008.2002982
Filename :
4802006
Link To Document :
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