wye delta transformers

[redwine47]

Tell me why I cannot swap a 1000kva wye delta with a 1000kva delta wye (no neutral ground) transformer. Thanks for you help

 

[Marmite]

You'll need to provide more information concerning the application to get a half decent answer. A single line diagram would be useful.
Regards
Marmite

 

[k2panman]

You can if the output of the transformer is radial (no other possible sources to parallel). Marmite is correct, there are other things to consider that should be looked at - a wiring diagram would be very helpful to let others see what you are considering.

K2ofKeyLargo

 

[waross]

You may experience overvoltage switching surges when you energize the wye:delta. Delta:wye is more common. Do you have a wye:delta transformer? What voltages?
Which is existing and which is proposed?

Bill
--------------------
"Why not the best?"
Jimmy Carter

 

[redwine47]

Thanks for trying but no answers; just generalizations. Can someone give a circuit based description why using a delta wye versus a wye delta is different?

 

[waross]

If you want a generalization, then generally delta:wyes are more common for distribution. With lower voltages there may be code issues with grounding.
A few issues:
Current distribution on the primary,
Switching surges,
Power back-feeds when a primary phase is lost,
Common practice and common utilization voltages,
Power transmission or distribution,
The number of primary conductors,
Ground fault scenarios.
A final generalization;
Vague questions such as this are often suspected to be homework and may be red flagged.

Bill
--------------------
"Why not the best?"
Jimmy Carter