Protective Relays Testing Intervals. What standard states times?

[AJ2002]

I am looking for the testing intervals for protective relays? Every two years seems to be a rule of thumb but many standards reference the manufacuture's manuals for recommended testing time frame. The manufactures in many cases say testing is not required after the initial setup, calibration and functional tests. I referenced NETA testing spec's for relays that told what to test but not how often. I referenced C37.90 there was no interval stated. I referenced IEEE Yellow it defers to C37. IEEE Buff states period testing required, but does not state when.

Does anyone have a standard to reference? Thank you for your responses.

 

[oldfieldguy]

stevenal--

I understand the NERC thing, but I had a very bad experience with one of my clients a few years back when a microprocessor-based relay died in service. He called us out to replace it with the spare that was on his shelf. It was purchased when he bought the original that had been in service seven years. When we tried to power up the spare to upload settings, it was dead. Power supply was defunct.

People need to use an intelligent approach to the needs of the individual situation instead of seeking out and mindlessly applying somebody else's template.

And regulatory requirements in all cases have the final say.

old field guy

 

[slavag]

Hi.
Im fully agree with Old Field Guy about spare parts.
It's very important point and lot of EE forgot about spare parts. For my pinion we have think about some "hot reserve spare parts"
Best Regards.
Slava