Hello, I am an Engineering Analyst working in the Power Generation industry. I work with various utilities in helping them improve the reliability of their plant. Recently I've been working on a project relating to Protective Relays. My question is, what has been your experience in Preventive Maintenance on Protective Relays? EPRI recommends testing/inspection of relays on a 4 to 8 year frequency depending on criticality and service. What do you find from your experience that the industry should be doing as far as maintaining Protective Relays?