Min-Soo Kim and Sang-Hee Kang
CT Saturation, Wavelet Transformation, Filter Banks
In this paper, distorted current relaying signals due to the CT saturation are analyzed with WT (Wavelet Transformation). Daubechies 2 is used as the mother wavelet. The output level (detail) of multi-level filter banks and the sampling frequency are also analyzed. The first output level of the multi-level filter banks for the output level (detail) and the 3,840Hz of the sampling frequency are adopted. A series of test results show that the proposed algorithm detects the saturated region accurately under various faults and CT conditions of a C800 CT model.
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