That's the big issue, the noise if you will.
This came up for me when using large step-up step-dn transformers on large scale PV projects, several 'other' engineers wanted to use a y/d-d/y configuration and it took forever to get across to them that there was no (easy/cheap) way to open a fault that way so they proposed a y/d-y/y configuration, which would work (noise was not an issue), but the additional cost and lead time was not worth it.
We standardized on a y/d-y/d configuration, but still wound up with one installation with a y/d-d/y configuration where we corner grounded the delta on the utility side of the run.
I still remember the jw and foreman calling me asking repeatedly, "this is going to work when I throw the switch right?" and the total surprise in their voice when they called back to say "damned if it doesn't work!".
Interestingly enough I discovered that a LOT of utilities use Wye/Wye transformers within their own distribution networks.
