This paper presents a technique for testing protection relays using advanced simulation tools and lab implementation models for a transmission line. Different Scenario were simulation and implemented on the transmission line in the lab the output voltage and current waves for the two process were filtered using digital filters to remove the transient components. Then fed to the programs describe the function of different protective relays. These evaluate the performance of protective relays for

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... both the signals. Obtained from the lab model and the signals obtained from the simulations. The simulation were performed using Alternative Transients Program (ATP). The programs operate correctly for fault cases obtained by lab model simulator.