교류 발전기 고정자 사고 검출을 위한 최적 마더 웨이브릿의 선정

• Published in: 전기학회 논문지 P권, 57(4) Vol. 57P; no. 4; pp. 377 - 382
• Main Author: 朴哲圓(Chul-Won Park)
• Format: Journal Article
• Language: Korean
• Published: 대한전기학회 2008
• Subjects: 전기공학; CRDR; DFT; Energy; Stator Winding; RMS Error; Generator Protection; ATP; Mother Wavelet; Daubechies
• ISSN: 1229-800X; 2586-7792

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.