ASSESSMENT OF FAULT LOCATOR FUNCTION FOR AREVA RELAY IN THE POWER SYSTEM

Abstract

This paper analyzes the fault location algorithm basing on the fault locator used in the numerical relay Areva P132 and P443, which takes into account the prefault load current and the infeed from the remote end. When the relay does any trip, the distance to fault location is computed by the information from the current, voltage inputs, line impedance and residual compensation factor settings to display on LCD. Besides, the Matlab/ Simulink software allows an analysis of the results of some fault conditions at various fault scenarios (fault resistance and fault type) which frequently occur on transmission line 172 at 110kV Quanngang Substation in Quangtri Province. This allows us to rethink the algorithm of areva. Simulation results with Matlab/ Simulink indicate that the fault location algorithms are correct and accurate with small fault resistance.