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Earth fault within motor on an IT system

Earth fault within motor on an IT system

Earth fault within motor on an IT system

(OP)
We have an insulated earth (IT system) power system.  This allows one phase to fail to earth and the system will continue to operate (albeit that the insulation is stressed higher).

So if a fault occurs at the terminal box of a motor or on the feeder cable to the motor should continue to operate as normal, right?

What happens if the earth fault occurs part way through the winding in the motor? Would the motor continue to operate as normal?

We have an earth fault on either the motor or the motor feeder cable.  We are not able to prove whether the fault is witin the motor or on the cable at the present due to the installation.  

The motor was stopped when it was reported to be running on lower than expected current (which is when the insulation checks were made and the fault to earth established).  Would the low current be an indication that the fault is in the motor?


 

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