A new frame work for quadrilateral distance relay

Abstract

In conventional transmission line protection, a three–zone stepped directional distance scheme is used to provide the primary as well as remote backup protection. The voltage and current phasors are needed by the distance relay for determining the impedance. In this paper, a new frame work is proposed using DSP kit, which acquires real-time signals of the currents, processes them digitally and outputs tripping signal to the circuit breaker. Algorithms of quadrilateraldistance protection function has been implemented first in PC using the Simulink/Matlab and then transferred into DSP Kit. To validate the present work, the performance of developed relay is tested by signals generated by Simulink/MATLAB simulator under different conditions. The obtained simulation results are satisfactory