Adedayo A. Yusuff, Adisa A. Jimoh, and Josiah L. Munda
Decaying DC offset, Stationary wavelet transform, Phasor estimation, Power transmission, Fault diagnosis
This paper presents a novel scheme for removing a decay- ing DC-offset from fault current measurements in a faulted power transmission lines. The technique is based on Stationary Wavelet Transform(SWT). The performance of the scheme on two study cases is investigated; the statistical performance in relation to noise on a hypothetical signal, and a modeled segment of a utility network in South Africa. The result shows that the scheme is robust, and that it can remove any dc-offset even at a noise level of 20 dB. The output of the scheme can be used for fault detection, classification and location.
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