A Novel Technique for Differential Protection for Resistance Grounded Three Phase Transformer Using Wavelet Packet Transformer

This paper presenting testing of wavelet packet transform based technique for the differential protection of the three-phase transformers. The proposed technique is implemented using a wavelet packet transform tested on two different three-phase transformers with neural resistance grounded. The differential protection of power transformers appears to be more difficult than any type of protection for any other part or element in a power system. Such difficulties arise from the existence of the magnetizing inrush current. The fault is identified using the proposed method.