A wavelet-based restricted earth-fault power transformer differential protection

Journal article (2021)

Authors

M. N.O. Aires Universidade Federal do Rio Grande do Norte
R.P. Medeiros Federal Rural University of the Semi-Arid
F.B. Costa Universidade Federal do Rio Grande do Norte
K.M. Silva Universidade de Brasélia
M. Popov Intelligent Electrical Power Grids - EEMCS
Research Group
Intelligent Electrical Power Grids (EEMCS) (TU Delft)
Copyright: © 2021 M. N.O. Aires, R. P. Medeiros, F. B. Costa, K. M. Silva, J. J. Chavez, M. Popov
DOI
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https://doi.org/10.1016/j.epsr.2021.107246
Wavelet transform Power transformer protection Restricted earth fault protection Turn-to-ground faults
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Published Date

2021

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Electrical Sustainable Energy

Research Group

Intelligent Electrical Power Grids

Abstract

This paper proposes a restricted earth fault protection based on the wavelet transform (REFW) for detecting ground faults close to the transformer neutral point (turn-to-ground faults) and supporting the conventional phase differential protection, which presents limitations in this kind of faults. The proposed REFW protection uses only high-frequency components instead of phasor estimation, speeding up the detection of turn-to-ground faults. A performance comparison between the proposed wavelet-based restricted earth-fault differential protection and the respective conventional restricted earth-fault (REF) unit was accomplished considering simulated turn-to-ground faults, involving a few winding turns. The proposed method is more efficient and faster than the conventional one, reaching a success rate of 100%.