NDLI: A new algorithm based on the morphological gradient for avoiding mal-operation of transformer differential protection

Content Provider	IEEE Xplore Digital Library
Author	Gu, J. Zheng, T. Huang, S.F.
Copyright Year	2010
Description	Author affiliation: Key Laboratory of Power System Protection and Dynamic Security Monitoring and Control under Ministry of Education, North China Electric Power University, Beijing 102206, China (Gu, J.; Zheng, T.; Huang, S.F.)
Abstract	To avoid the mal-operation of transformer differential protection when external fault occurs with current transformer (CT) saturation, a new algorithm based on the mathematical morphology is put forward in this paper. Unlike the conventional Time Differential Method, the new algorithm only needs detecting the instant of fault occurring, while the instant of differential current appearance is no more needed. A new current waveform is obtained by a symmetrical transformation of initial part of differential current after fault occurrence, and then its characteristic is exacted by morphological gradient. In the case of CT serious saturation, a discrimination of external fault and internal fault can be clearly made by this algorithm. In addition, analysis shows that the new algorithm based on the mathematical morphology could also be applied for the identification of transferring fault (external fault transfers to internal fault). Simulation results of MATLAB validate its feasibility and reliability.
Starting Page	1
Ending Page	7
File Size	391945
Page Count	7
File Format	PDF
ISBN	9781424465491
ISSN	19449925
e-ISBN	9781424465514
e-ISBN	9781424483570
DOI	10.1109/PES.2010.5588158
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-07-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Circuit faults Fault currents Computed tomography Time division multiplexing Current transformers Morphology Transient analysis Transformer differential protection Current Transformer (CT) saturation External fault Mathematical gradient Time differential method Transferring fault
Content Type	Text
Resource Type	Article

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