Protection Relay: SEL351 fault flags
Protection Relay: SEL351 fault flags
(OP)
Hi
Has anyone experienced incorrect flagging on the front of these relays for single phase earth faults, it shows/flags more than one phase for a pure earth fault trip/operation
thanks
Has anyone experienced incorrect flagging on the front of these relays for single phase earth faults, it shows/flags more than one phase for a pure earth fault trip/operation
thanks






RE: Protection Relay: SEL351 fault flags
Often faults can transision from what they start out as, into something else. Or you could have a large negitive sequence flow that fools the relay.
RE: Protection Relay: SEL351 fault flags
RE: Protection Relay: SEL351 fault flags
RE: Protection Relay: SEL351 fault flags
I agree with checking the logic. Just because the relay has label next to the LED doesn't mean it is programmed to match. Also, if you're having issues, I would not hesitate to contact SEL support. They are generally pretty helpful.
RE: Protection Relay: SEL351 fault flags
RE: Protection Relay: SEL351 fault flags
RE: Protection Relay: SEL351 fault flags
I second contact SEL support, my experience with them has generally been excellent.
Regards,
mgtrp
RE: Protection Relay: SEL351 fault flags