New Fault Location Scheme for a Two- Terminal Transmission Line Using Synchronized Phasor Measurements

Abstract

This paper describes a new iterative method to locate fault on a single transmission line. The method uses synchronized voltage and current measurements from both terminals. Using positive sequence components of the pre-fault and fault waveforms, positive sequence source impedances are estimated. Using these source impedances and the line data, positive sequence bus impedance matrix (Zbus) is formed. Using the properties of Zbus, an iterative algorithm is proposed to locate the fault. This algorithm is applied to the data obtained from the EMTP simulation of two transmission lines. The simulation results show that though the method gives fairly accurate results for both medium and long transmission lines, its performance is better for medium and short lines