Fault Diagnosis on a 330kV Power System Transmission Line Using S-Transform Technique

Abstract

Due to the frequent and unpredictable occurrence of faults in the power transmission system, the need for a method intelligent enough to detect and diagnose faults becomes imminent to ensure the reliability of power system protection. This paper presents a fault diagnosis approach that uses the S-Transform technique to detect and analyze the fault occurring on the 330kV Ajaokuta to Lokoja 47.39km transmission line using MATLAB/SIMULINK. The S-Transform technique modelled, employs a scalable and moving localizing Gaussian window to identify faults. The voltage and current energy signal, the S-transform waveform, and the discrete voltage and current signal are used to diagnose each fault condition simulated on the line. The results obtained shows that at pre-fault condition, the value of the voltage magnitude was greater than the value of the current magnitude while at various fault conditions, the value of the current magnitude was greater than the value of the voltage magnitude which were all in accordance with conventional circuit theorem.