Relay testers test protective relays to answer one of three questions:
- “Did the relay manufacturer send us a functioning relay?” is answered via an Acceptance Test
- “Will the relay operate correctly in this application as programmed?” is answered with a Commissioning Test
- “Is the relay still functioning correctly?” is answered with a Maintenance Test
We covered the first two questions in previous lessons. The videos in this lesson will show you a variety of maintenance testing techniques to determine if a relay is still functioning correctly.