11kV motor: Unequal winding resistanmce
11kV motor: Unequal winding resistanmce
(OP)
We have a motor which tripped on protection operation.
The winding resistance of motor when measured indicates R&Y phases - 99 m.Ohm and W-phase - 198m.Ohm.
The Insulation Resistance values are OK.
Any expert opinion what could have caused the resistance in two windings to be half that of the other winding.
The motor is yet to be opened.
Thanks in anticipation.
The winding resistance of motor when measured indicates R&Y phases - 99 m.Ohm and W-phase - 198m.Ohm.
The Insulation Resistance values are OK.
Any expert opinion what could have caused the resistance in two windings to be half that of the other winding.
The motor is yet to be opened.
Thanks in anticipation.





RE: 11kV motor: Unequal winding resistanmce
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 11kV motor: Unequal winding resistanmce
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *
RE: 11kV motor: Unequal winding resistanmce
I will post again when the motor is opened / more info is available.
Thanks.
RE: 11kV motor: Unequal winding resistanmce
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *
RE: 11kV motor: Unequal winding resistanmce
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 11kV motor: Unequal winding resistanmce
It will be 1:2 if we are measuring individual phase resistances.
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *
RE: 11kV motor: Unequal winding resistanmce
Bill
--------------------
"Why not the best?"
Jimmy Carter
RE: 11kV motor: Unequal winding resistanmce
in the subject motor case, all the six leads from the windings are available. In fact, the Star formation is done externally in the cable box.
RE: 11kV motor: Unequal winding resistanmce
In that case, my first post would apply.
Please post your findings here after you open the motor.
* Women are like the police. They can have all the evidence in the world and yet they still want a confession - Chris Rock *