Synchcheck/synchroscopes and phase rotation
Synchcheck/synchroscopes and phase rotation
(OP)
I was amazed to learn that your average synchcheck relay will not detect the wrong phase rotation on one side (say a generator). Even the phase to phase ones! Also as I understand it the SEL300G does not detect this. How can this be! Surely, at commissioning the wrong rotation is a very real possibility. Can anyone explain why there is this the blind spot in design. I would have theought that it is so easy to check on phase to phase units.






RE: Synchcheck/synchroscopes and phase rotation
RE: Synchcheck/synchroscopes and phase rotation
RE: Synchcheck/synchroscopes and phase rotation
Single phase sync check relay is not intended to be a phase rotation check device or even a phase loss device. As with all designs, their validity depends on intended application and skills of the operators.
Rafiq Bulsara
http://www.srengineersct.com
RE: Synchcheck/synchroscopes and phase rotation
Rafiq Bulsara
http://www.srengineersct.com
RE: Synchcheck/synchroscopes and phase rotation
Do a little research on synchronizing lamps and you will see this is not so.
Or if you prefer vectors, draw two delta or star diagrams to represent the two three phase systems. One diagram may then be rotated to simulate a small frequency difference as is normal during synchronization. You may rotate one diagram so that any phase of one system is in sync with the corresponding phase of the other system, at which time the other two phases will be badly out of sync.
One advantage of using one phase to sync is simplicity of switching. We had 5 generators and one syncroscope. A single pole- five position switch was all that was required to switch the scope' input between the five generators when syncing to the bus.
Bill
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"Why not the best?"
Jimmy Carter
RE: Synchcheck/synchroscopes and phase rotation
RE: Synchcheck/synchroscopes and phase rotation
Bill
--------------------
"Why not the best?"
Jimmy Carter