Fault location using the high frequency travelling waves measured at a single location on a transmission line

The paper describes how the high frequency travelling waves caused by a fault on a transmission line can be observed in the secondary of a conventional protection current transformer. Information extracted from the secondary currents, measured at one location, is used to determine the phases involved in the fault and its location. The validity of the proposed single ended fault location technique is assessed by comparing the fault location decision obtained when analysing the current signals captured by a high frequency disturbance recorder with the actual location of the fault. The actual location was determined using information from a double-ended GPS synchronised travelling wave fault locator and, if available, information from a maintenance crew