High-leg delta - Wikipedia Phasor diagram showing 240 V delta and center-tapped phase (a-c) creating 120 V voltages. Consider the low-voltage side of a 120/240 V high leg delta connected transformer, where the 'b' phase is the 'high' leg. The line-to-line voltage magnitudes are all the same: = = =. Because the winding between the 'a' and 'c' phases is center-tapped, the[PDF] Three Phase Transformers - Dongan 28 Dongan® Electric Manufacturing Company Three Phase - General Purpose Primary Volts 480 Delta, Secondary Volts 240 Delta, 60 hz May be used on a 480Y / 277 Volt Supply *Transformers 15 kVA through 150 kVA are equipped with a 120 volt lighting tap.
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