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#6041 - 12/20/01 07:28 AM Wye or Delta?  
Joe Carpenter  Offline
Member
Joined: Dec 2001
Posts: 50
USA
A 4 wire 3phase system with 480 volts phase to phase and 277 volts phase to neutral. Is this always a wye system? What are the differences between 480 Wye systems and 480 Delta Systems?

Thanks


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#6042 - 12/20/01 07:44 AM Re: Wye or Delta?  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA


Joe Tedesco, NEC Consultant

#6043 - 12/20/01 08:00 AM Re: Wye or Delta?  
George Corron  Offline
Member
Joined: May 2001
Posts: 717
Lorton, Va USA
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.


#6044 - 12/20/01 01:28 PM Re: Wye or Delta?  
resqcapt19  Offline
Member
Joined: Nov 2000
Posts: 2,148
IL
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)


Don(resqcapt19)

#6045 - 12/20/01 07:38 PM Re: Wye or Delta?  
aphares  Offline
Member
Joined: Dec 2001
Posts: 37
Indiana
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


#6046 - 12/20/01 09:18 PM Re: Wye or Delta?  
George Corron  Offline
Member
Joined: May 2001
Posts: 717
Lorton, Va USA
OOPS 480/1.732 = 277 fat fingered, non-proof reading rascal.


#6047 - 12/21/01 12:55 AM Re: Wye or Delta?  
Scott35  Offline

Broom Pusher and
Member
Joined: Oct 2000
Posts: 2,707
Anaheim, CA. USA
Joe [Joe Carpenter],

Are you looking for Schematics, or technical differences between Deltas and Wyes?

If you would like to view some Schematics, look in either the Technical Reference area or the Electrical Theory area of this forum [ECN]. I'll post hyperlinks later if needed.

I'll add some tech data later on.

Scott SET

P.S. Does anyone manufacture a 480/277 4 wire Tee Transformer???

SET


Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!


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