Transformer Protection Using the Wavelet Transform

Authors: OKAN ÖZGÖNENEL, GÜVEN ÖNBİLGİN, ÇAĞRI KOCAMAN

Abstract: This paper introduces a novel approach for power transformer protection algorithm. Power system signals such as current and voltage have traditionally been analysed by the Fast Fourier Transform. This paper aims to prove that the Wavelet Transform is a reliable and computationally efficient tool for distinguishing between the inrush currents and fault currents. The simulated results presented clearly show that the proposed technique for power transformer protection facilitates the accurate discrimination between magnetizing inrush and fault currents in transformer protection.

Keywords: Differential Protection, Power Transformer, Discrete Wavelet Transform (DWT), Fast Fourier Transform (FFT), Discontinuity Analysis

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