Fusing Problem 1

[surineman]

I have 24.9/14.4 Kv utility supply from Hydro One to our new water treatment plant.

Our main transformer is 750 KVA delta/wye.
One of the transformer suppliers keeps calling me about fusing problem from utility(wye connection) to primary side of transformer(delta connection).

Any Ideas about this concern?

Regards

 

[weh3]

What is the problem?

Will-I-Am

 

[surineman]

First of All, As I mentioned in question, one supplier is referring to fusing problem.

And secondly, I am wondering if it is better to specify a Wye/Wye Transformer as oppose to Delta/Wye.(for instance what we should do with neutral wire of Hydro connection?)

So far as I remember, I always saw Delta/Wye Transformers in industrial applications I have been involved with, although I confess I am not Power specialist.

Regards

 

[weh3]

Surineman,

You do not say what the fusing problem is.

Wye/wye is not generally recommended, because the utility can see a single-phase fault on your side. Harmonics are also a problem. I would think wye/delta, with impedance-grounded wye (fault current limitation) on your side and delta on the utility side, but the utility has a way of doing things that they will be glad to tell you.

William