Novel wavelet approach to current differential pilot relay protection |
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Authors: | Chi-Kong Wong Chi-Wai Lam Kuok-Cheong Lei Chu-San Lei Ying-Duo Han |
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Affiliation: | Fac. of Sci. & Technol., Univ. of Macau, Taipa, Macau; |
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Abstract: | This paper describes a novel technique for current differential pilot relay protection (CDPR) by using wavelet analysis. Power system CAD (PSCAD) is used to generate current signals at both ends of a transmission line in a typical system with fault at various locations. In this paper, discriminating between internal fault and external fault/change, identifying of faulted phase, and classifying fault type are achieved by using wavelet analysis. The simulation results show that this approach provides a high operating sensitivity for internal fault and remains stable for external fault/change. |
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