Discriminating Among Inrush Current, External Fault and Internal Winding Fault using Coefficient of DWT

Chaiyan Jettanasen, Jittiphong Klomjit, Apichart Yodkhuang, Atthapol Ngaopitakkul, and Chaichan Pothisarn


External fault, Internal fault, Transformer, Discrete Wavelet Transforms


This paper proposes a technique for discriminating among inrush current, external fault and internal winding fault of three-phase two-winding transformer which variations of coefficients of high frequency component obtained from DWT of differential current are analyzed. The maximum coefficient details of DWT are performed as comparison indicator. Various cases based on Thailand electricity transmission and distribution systems are studied to verify the validity of the proposed algorithm. Results show that the proposed technique has good accuracy in the considered system.

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