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Inrush currents in power transformers are non-sinusoidal, high magnitude currents generated due to flux saturation in the core during energization. This paper describes a decision method for discrimination between internal faults and inrush currents in power transformers using the wavelet transform based feature extraction technique. It is shown that the features extracted by the wavelet transform...
This article introduces wavelet analysis theory to identify inrush and internal fault correctly. The wavelet transform has the characteristic of multi-scale analysis and good time and frequency domain localization, fits to extract sudden-change signals in transient processes, and detects irregularity of signals very well. This article analyzes the mechanism of transformer generating excitation inrush,...
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