A NEW TECHNIQUE FOR LOCATION OF TRANSMISSION-LINE FAULTS USING SINGLE-TERMINAL VOLTAGE AND CURRENT DATA

This paper presents a new technique for location of transmission line faults using voltage and current measurements from one end of the faulted line. The method differs from past techniques in many respects. The main feature of the new technique is that it considers the influence of the remote-end infeed of the transmission line, the effect of the transmission line capacitance, fault resistance, prefault loading conditions, and the effect of mutual coupling between different phases of the line, and then computes with a microprocessor the distance to the fault point without any approximations. It uses recorded phase voltages and currents at the near end, then the fundamental components of the measured signals are extracted using microprocessor filters. The modal values of the extracted signals are computed then processed to indicate the precise location of the fault.