Wavelet transform in the accurate detection of high impedance arcing faults in high voltage transmission lines

This paper describes a new fault detection technique which involves capturing the current signals generated in a transmission line under high impedance faults (HIFs). Its main thrust lies in the utilisation of the absolute sum value of signal components based on the discrete wavelet transform (DWT). A sophisticated decision logic is also designed for the determination of a trip decision. The results presented relate to a typical 154 kV Korean transmission system, the faulted signals for which are attained using the well known Electromagnetic Transients Program (EMTP) software. The simulation also includes an embodiment of a realistic nonlinear HIF mode