Wavelet transform based accurate fault location and protection technique for cable circuits

This paper presents a new fault location technique applicable to power cable circuits. The proposed fault locator consists of a transient detection device installed at the busbar to detect the high frequency voltage transient signals. The initial and subsequent reflected travelling waves caused by the fault are recorded. The wavelet transform (WT) is used as a filter bank to decompose the fault signals. The travelling times of fault transients and consequently the location of the fault are calculated using the extracted signals. The simulation studies showed that the wavelet transform is very effective to extract the transient components from the complicated fault signals.