DISTANCE RELAY APPLICATION TESTING USING A DIGITAL SIMULATOR

This paper reports on distance relay application testing using simulat ed transient waveforms. Power system modeling and test procedure for u sing modem digital simulators are presented. Extensive study of five c ommercial relays comparing the application for a 345kV transmission li ne is carried out by performing thousands of one-terminal and synchron ized two-terminal transient tests. The approach using digital simulato rs has proved to be an efficient technique. This paper presents a meth odology for evaluating distance relay transient performance based on e xtensive laboratory testing. important issues regarding application te sting, such as CT and CCVT effects and selection of prefault waveform length, are also addressed and investigated in this paper.