Step up Transformer to Step down Transformer

[HamidEle]

We are using a step up transformer feeding power from Generator ( 480V Delta/4160V Wye). At 480V level, a load bank is connected. I wonder if we could use this transformer as a step down transformer( Wye4160V/480V Delta). The power would be from Utility. The generator would be disconnected. The problem is, how will the load bank be connected to Delta System.

 

[edison123]

If the transformer does not have unidirectional on-load tap changer gear, then there should be no problem backfeeding the trafo.

I don't understand your load bank Delta problem. It's already working from a delta connected generator, doesn't it ?

Muthu

http://www.edison.co.in

 

[itsmoked]

Why would you even need a load bank if you ditch the generator?

Keith Cress
kcress -

http://www.flaminsystems.com

 

[oldfieldguy]

I read this twice. You're going to load test the utility?

old field guy

 

[cranky108]

Utilities like for customers to load test them.

 

[HamidEle]

4160V system will be connected to a new generator, which will need to be loaded before the other loads are connected.

 

[zade]

When you use transformer backwards you need to make sure that your tap settings are at normal otherwise your core losses will be high and transformer will run hot based on tap settings.

 

[davidbeach]

Define "backwards". There is no "right" direction through a transformer, therefore there can be no "wrong" or "backward" direction.

 

[cranky108]

I would take backwards to mean the reverse of a stepdown. It's not important in the way the transformer operates, but it is important in calculating the voltage effect of the taps on the transformer.

Both are correct in that there is no backwards, and there is a forwards.