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The paper mills I work at have high resistance grounds. You don't want the paper machines shutting down just because a motor fails. Especially if there is a redundant motor to take its place.
Just some wording in your post that need straitening out, if the motor fails you are shutting down, if one phase faults you will continue to run.
 

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One EE told me the big advantage is limited short circuit current in phase to ground fault. Less explosion factor.
Yes on the first fault the fault current is limited to somewhere (IN MY EXPERIENCE) to less that 12-25 amps. In an Unground system the fault current is "0" amps
 
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