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A Selection of an Optimal Mother Wavelet for Stator Fault Detection of AC Generator  

Park, Chul-Won (강릉대학교 전기정보통신공학부)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.57, no.4, 2008 , pp. 377-382 More about this Journal
Abstract
For stator winding protection of AC generator, KCL(Kirchhoff's Current Law) is widely applied. Actually a CRDR(Current Ratio Differential Relay) based on DFT(Discrete Fourier Transform) has been used for protecting generator. It has been pointed out that defects can occur during the process of transforming a time domain signal into a frequency domain one which can lead to loss of time domain information. Wavelets techniques are proposed for the analysis of power system transients. This paper introduces an algorithm to choose a suitable Mother Wave1et for generator stator fault detection. For optimal selection, we analyzed db(Daubechies), sym(Symlets), and coif(Coiflects) of Mother Wavelet. And we compared with performance of the choice algorithm using detail coefficients energy and RMS(root mean square) error. It can be improved the reliability of the conventional DFT based CRDR. The feasibility and effectiveness of the proposed scheme is proved with simulation using collected data obtained from ATP (Alternative Transient Program) package.
Keywords
ATP; CRDR; Daubechies; DFT; Energy; Generator Protection; Mother Wavelet; RMS Error; Stator Winding;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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