A wavelet-based differential transformer protection

Transformer inrush currents wcrc traditionally evaluatcd by means of Fouricr analysis. Such approach arfects the design of transformer differential rclays canccrning thcir immunity to inrush currents. This piper presenls a wavelel-based method, which seems to providc a reliablc and compulationally eCCicicnt tool Air distinguishing bclwecn inlcrnal faults and inrush currents.