Ship's power is generated as 3-phase and is ungrounded. On a delta-wound transformer with 120 VAC line-to-line secondary, what is the voltmeter reading from line to ground:

Question

Ship's power is generated as 3-phase and is ungrounded.  On a delta-wound transformer with 120 VAC line-to-line secondary, what is the voltmeter reading from line to ground:

Accepted Answer

Any of the above

Answer

Approx 67 volts for a normal balanced system with no faults

Answer

0 VAC for a system with that phase faulted to ground

Answer

120 VAC when another phase is faulted to ground

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