Quote:
Originally Posted by Bookman
Most three phase transformers are connected Delta/Star in which the primary Voltage is the phase Voltage and in this case will be 415 Volts. That is, each transformer winding will provide its nominal output if 415Volts is applied to the primary.
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Referring to just "phase voltage" can be a bit ambiguous. For clarity, a delta input with 415Vac refers to the phase-to-phase voltage, and it is that voltage across each primary winding on each core leg (limb).