A Fault Detection Technique in Transmission Line By using Discrete Wavelet Transform

This paper presents a novel technique of fault detectionin high voltage transmission lines using the wavelet transform during power swing condition. Recently, many fields has been applied successfully the wavelet transform. This technique is the absolute sum value of coefficients in multi resolution signal decomposition is utilised based on the discrete wavelettransform (DWT). To discriminate between fault and non-fault transient caseslikeline switching and capacitor and loads in arc furnace, the concept of time duration, i.e. the presence of transient time period. It is shown that the developed technique is robust for differenttypes of fault, fault-inception angle, fault resistance and fault location. This technique is also tested in 3 machine 9 bus power system with different types of fault.