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wye delta transformers

wye delta transformers

wye delta transformers

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

RE: wye delta transformers

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

RE: wye delta transformers

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

RE: wye delta transformers

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

RE: wye delta transformers

(OP)
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?

RE: wye delta transformers

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

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