What can be the probable causes of inter turn short circuit in the overhang stator winding of an lt Induction Motor? The motor under question was 132 kw, 2 pole 415 volts m/c.

 

Responding to Prashant's Apr 10, 11:33pm query:

What is starting method?

Regards,
Phil Corso, PE {Boca Raton, FL, USA}
[[email protected]] ([email protected])

 

There are a couple things that may cause this:
If the power system is a WYE the problem may be caused by a high harmonic content and if the power system is an ungrounded DELTA the cause could be arcing ground faults (spikes). You can get more info at http://www.phaseback.com

I hope this helps.

 

Bad insulation.

Regards

cww

 

Further to my Apr 13, 12:51pm response to Prashant's post...

Bill Moore, PE, of National Coil Company, authored a timely article on a
related subject for the Mar '06 issue of Power Magazines.

Titled "Include Generators and Exciters in Your Outage Inspections" it
contains dramatic colored photo's of failures found in windings.
Although specific to generator and exciters, it clearly illustrates the
effects of winding vibration and insulation migration in rotating
electrical machines.

Contact information is:

[email protected] or 614-488-1151!

Regards,
Phil Corso, PE {Boca Raton, FL, USA}
[[email protected]] ([email protected])