What to expect during phase failure?
What to expect during phase failure?
(OP)
I am a bit confused with the notation that a star wound induction motor will suffer no overcurrent during phase failure while the delta connected one will get higher current.
Equations for start or delta loading shows that no change for a star but with delta connected load, faulty condition will have about 86% of the healthy line current with the same phase current and half of it for the faulted branch (two phases connected in series).
Any clue?
Equations for start or delta loading shows that no change for a star but with delta connected load, faulty condition will have about 86% of the healthy line current with the same phase current and half of it for the faulted branch (two phases connected in series).
Any clue?





RE: What to expect during phase failure?
In the event that a plant loses one incoming phase, any motors that are running will try to replace that phase, until their unbalance protection clears them off line.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: What to expect during phase failure?
single phasing in delta connected motor
Muthu
www.edison.co.in
RE: What to expect during phase failure?
If the over-current protection correctly oriented the MOTOR will stop after a TIME