Ungrounded Wye vs. Delta Generation

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So I have seen a couple of systems out there now and some are ungrounded Wye generation and some are Delta generation. What are the pros and cons of each??

I understand that in Delta generation if a winding were to go, the process it was generating to would not fully be hooped.

Both systems would have a zig-zag grounding transformer connected at the bus it is generating to comply with code and for all transient/ safety reasons.
 
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