Digital Simulator Applications in Protective Relay Testing

This document discusses applications of digital simulators in protective relay testing with an emphasis on end-user evaluation and testing of relays in laboratory facilities. A background on digital simulators and transient testing together with a description of a twoterminal simulator test setup are given first. Description of a transmission network model and its use for generation of transient tests is given next. Methodologies for testing transmission line and bus differential relays are presented. Finally, examples of results obtained using digital simulator and transient testing are given at the end.