Given a 2MVA 480V (delta)/12470V (wye-grounded) generator step-up transformer that will be interconnected to the utility. How to determine the size (rating & quantity) of PT's & CT's in the primary for 27, 59, 81O/U and 67N protective relaying? Is there any literature for this? Also, what is the best method of grounding (primary transformer neutral)for this set-up?
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