Fault Location in MV Unearthed Distribution Network Using the Undamped Frequency of the Transient Signal

摘要

This paper present a method to locate a fault location for single phase to earth fault in medium voltage (MV) unearthed network using undamped frequency of the transient signal. During the earth fault, a transient component in the fault signal provides valuable information for fault location purposes. The fault distance is formulated using the lumped parameter model. In this paper, the properties of Hilbert transformation are used to estimate the damping attenuation of transient signal. The networks considered are assumed to be radially operated and modelled using ATPDraw program. Furthermore, the accuracy of technique was tested on parameters such as a fault distance, fault resistance and the voltage inception angle. Some sources of error affecting the method accuracy, are explained. Finally, the possible correction technique is explained to compensate the computation error.