Issues and Opportunities for Testing Numerical Relays

This paper reviews the use of modem Relay Test Sets, Real-Time Playback Simulators and Real-Time Digi- tal Simulators for testing numerical relays. The issues con- cerning the generation of data for testing relays are exam- ined. Types of tests that can be performed on numerical relays are also reviewed. A procedure for identifying criti- cal tests is discussed. A procedure for testing relays by using recorded data i.s described as well. The paper demonstrates that there is a need for the relay manufacturers to provide facilities in their relays for testing them by using the clata acquired by numerical devices in- stalled in the system