The total power capacity of two identical single-phase transformers connected in Open-Delta (V-V) configuration is what percentage of a closed delta bank?
A66.7%
B57.7%
C86.6%
D50.0%
Explanation
An open-delta (V-V) bank provides 57.7% (1/sqrt(3)) of the power rating of a full three-transformer closed delta bank.

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