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soojoychat
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Join Date: Jun 2010
Posts: 4

Electrical - Cage Motor

11/05/2010 7:44 AM

One phase of a 90hp,550V,3ph,1470rpm,sq cage motor is showing '0' IR value b2in Ph-Earth.Why only one ph got burnt?
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Anonymous Poster
#1

Re: eletical

11/05/2010 8:02 AM

hi,

maybe because the voltage on that phase was not same as the other 2 phases by some reason, and that phase winding was pulling higher amps!

must be there is circuit brekaer for this motor, is it the right size to protect your motor?
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PWSlack
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#2

Re: Electrical - Cage Motor

11/08/2010 9:36 AM

It might be that in connecting itself phase to earth to produce the fault it has become diconnected from the other two phase connections internally.

The motor needs rewinding or replacing.

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