ADVANCED METHOD FOR TESTING OF DISTANCE RELAY OPERATING CHARACTERISTIC

This paper describes a test method for distance relays using an advanc ed open-loop digital simulator. Derivation of test signals during pref ault and fault, and test procedure are introduced. It is demonstrated that the method of generating test signals and the procedure of applyi ng them to a relay under test directly affect test results. Prefault v oltage and current are also a very important factor. The decaying de o ffset is considered as well. Test results for five different relays us ing this new method are presented in this paper. The results demonstra te practical benefits of the test method.