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Protective Relaying Algorithm for Transformer Using Wavelet Transform  

홍동석 (한전 전력연구원)
이종범 (원광대 전기전자 및 정보공학부)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers A / v.52, no.2, 2003 , pp. 134-141 More about this Journal
Abstract
The power transformer is one of the very important electric facilities in power systems. Recently, current differential relay is widely used to protect such power transformer But if inrush occurs in transformer, relay can be tripped by judging like internal fault. Therefore the correct discrimination between internal winding fault, inrush and overexcitation should be performed. This paper presents a new protective relaying algorithm which discriminates inrush, internal faults and overexcitation of transformer modelled using BCTRAN and HYSDAT of EMTP. Discrimination between internal winding fault and inrush is revealed in simulation within 1/2 cycle after fault. Accordingly, it is evaluated that the proposed algorithm has better discrimination characteristics in various cases thin the current relaying for protection of transformer.
Keywords
Power transformer; Current differential relay; Internal fault; Inrush; Overexcitation;
Citations & Related Records
Times Cited By KSCI : 5  (Citation Analysis)
연도 인용수 순위
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