Accurate fault location and protection scheme for power cable using fault generated high frequency voltage transients

Abstract

A new technique for accurate fault location and protection of distribution cable is presented in the paper. A specially designed transient capturing unit is used to extract the fault generated high frequency voltage transient signals from the distribution cable system. The travelling time of the high frequency signal is used to determine the fault position. The scheme is insensitive to fault type, fault resistance, fault inception angle and system source configuration. Studies show that the proposed technique is able to offer a very high accuracy in both fault location and fault detection.