Joe, The short answer is, a Delta system will produce phase to ground voltage that is 1/2 of the phase to phase voltage, Wye system the phase to ground voltage is phase to phase voltage X 1.732. In your question 480 X 1.732 = 277, therefore you have a Wye system. Let's make that 3 phase systems, single phase transformers can be wound in any danged way ya wanna.
Re: Wye or Delta?#6044 12/20/0101:28 PM12/20/0101:28 PM
If the voltage to ground is 1/2 the phase to phase voltage, you would have a 4 wire delta with a high leg. If the delta is ungrounded the phase to ground voltage will float between 0 and the phase to phase voltage. If the delta is a grounded delta, one leg will be 0 volts to ground and the other 2 will have the phase to phase voltage to ground. Don(resqcapt19)
Re: Wye or Delta?#6045 12/20/0107:38 PM12/20/0107:38 PM
The delta connection of the circuits in a three phase system in which the terminal connections are triangular like the greek letter DELTA. The delta connection will stand 1.732 as much current as the Y connection, but will give only .577 as much voltage. 480 X .577 = 276.96 (NOT) 480 X 1.732 = 831.36