Classification of faults in a hybrid transmission line system with overhead and underground cables

This paper shows how to classify faults on a hybrid transmission line. The coefficients of discrete wavelet transform were used to evaluate current signals (DWT). To decompose high frequency components from fault signals, Daubechies4 (db4) is used as the mother wavelet. ATP/EMTP is utilized to mimic fault signals from current signals in this study. In the instance of single circuit single conductor with overhead and underground, a hybrid system between overhead line and subterranean cable of 115 kV from Provincial Electricity Authority (PEA-Thailand) was utilized as a simulated case study. The location of the fault, the kind of fault, and the angle of the fault has all been considered. Using MATLAB software, DWT is then applied to phase current and zero sequence signals in order to produce a coefficient in scale 1 for further analysis. This value is mostly utilized in the development of fault classification algorithms. The research's findings are satisfactory.