induction motor
induction motor
(OP)
Hello, If there is unstable line to ground voltage on a delta connected three phase induction motor motor what effect can it have on the motor. Given the line current and the line to line voltages are stable and within specification.
please advise.
please advise.





RE: induction motor
RE: induction motor
Bill
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"Why not the best?"
Jimmy Carter
RE: induction motor
RE: induction motor
If the system is 3-Ph 4 Wire (i.e. Star connected, neutral grounded transformer), the voltage on any phase to ground will rise only in case one of the other two phases develops a low impedance earth leakage due to insulation failure.
In this case, there seems to be one. However, if it is well below the protection settings of the upstream switchgear (Sensitive E/F), there is no reason for immediate worry. But, it would be a good idea to get the IR's for the system rechecked.
Hope the answer is acceptable. Please correct me if I am wrong.
Fahad Shaikh.
RE: induction motor
Any fault capable of noticeably changing the voltage to ground on a grounded system will will be cleared by the protection before the voltage difference is apparent.
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: induction motor
But in this case-4 wires distribution- could be a current unbalance and the neutral current circulation deploys the neutral point- in a remote location
from the grounded transformer neutral.So, nothing is concerning about ,indeed.