Journal
ELECTRIC POWER SYSTEMS RESEARCH
Volume 81, Issue 1, Pages 19-24Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.epsr.2010.07.010
Keywords
Differential protection; Discrete Wavelet Transform (DWT); Median Absolute Deviation (MAD); Transformer internal fault
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This paper proposes a novel methodology for transformer differential protection, based on wave shape recognition of the discriminating criterion extracted of the instantaneous differential currents. Discrete wavelet transform has been applied to the differential currents due to internal fault and inrush currents. The diagnosis criterion is based on median absolute deviation (MAD) of wavelet coefficients over a specified frequency band. The proposed algorithm is examined using various simulated inrush and internal fault current cases on a power transformer that has been modeled using electromagnetic transients program EMTDC software. Results of evaluation study show that, proposed wavelet based differential protection scheme can discriminate internal faults from inrush currents. (C) 2010 Elsevier B.V. All rights reserved.
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