delta vs wye help

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pegggu

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can someone briefly explain/summarize why the secondary on a wye system is 120/208v but a delta system is 120/240v (ignoring high leg and corner leg delta's)?

why is delta not 120/208v as well since it's also a 3 phase system?

and ignoring the high leg and corner leg delta's... delta only has a phase-phase voltage, which would be 240v, correct? there is no phase-neutral voltage if there is no neutral.
 
pegggu said:
can someone briefly explain/summarize why the secondary on a wye system is 120/208v but a delta system is 120/240v (ignoring high leg and corner leg delta's)?
Click to expand...

A delta system (ignoring high leg) would be 240V, not 120/240V. A high leg delta would be 240/120v.

pegggu said:
why is delta not 120/208v as well since it's also a 3 phase system?

and ignoring the high leg and corner leg delta's... delta only has a phase-phase voltage, which would be 240v, correct? there is no phase-neutral voltage if there is no neutral.
Click to expand...

The easiest way to visualize it would be to draw it out. Draw a wye with the length of the phase to neutral connection of 120 units. You will see that the length of the phase to phase connections will equal 208 units.
Next draw a delta with the length of the phase to phase connections equal to 240 units. You can see, as you noted, there is only phase to phase voltage, not phase to neutral. That is why delta is not 208/120V like a wye is.
 
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