Question

An open-delta three-phase transformer system has one transformer center-tapped to provide a neutral for single-phase voltages. If the voltage from line to center tap is 277 V, what is the high-leg voltage?

Answer 1

Answer:

 The  high-leg voltage is $V_h= 497.76V$

Explanation:

A diagram showing the arrangement of this three phase transformer is shown on the first uploaded image

The high - leg terminal is in the diagram is from $Z_1 - n$

Generally the high-leg terminal is 1.732 times of the the voltage from line to center tap which is given as 277 V

    The high -voltage can be computed as follows  

          $V_h = 1.732 *277$

               $V_h= 497.76V$