480v isolation transformer on 240v service

[Sparky4598]

Hi all, I found a really good deal on a 480v drive isolation transformer but my service is 240v.

My question is since it is just a 1:1 isolation transformer, could it be used on 240v service?

Initially I thought yes, but then I got to thinking the inductance may be different and it would pull too much or too little current to work properly.

I only need a 15kVA transformer for the load I have, but the one I found is a 34kVA so it would be considerably oversized which I have always understood to be fine, but I'm this case I don't know.

Can anyone offer some advice or help me understand this a little better?

Thanks!

 

[waross]

A 34 KVA, 480 Volt isolation transformer used on 240 Volts will be re-rated to 17 KVA.
The rated current is the limit and rated current times applied voltage is the KVA.
The losses are mostly current based so the losses will be about the same.
The same losses on 1/2 the KVA will look like a drop in efficiency percentage.
Fun with numbers.
Compare the cost of the losses to the cost difference of a 240 Volt isolation transformer and you will probably use the transformer that you have.

 

[Sparky4598]

A 34 KVA, 480 Volt isolation transformer used on 240 Volts will be re-rated to 17 KVA.
The rated current is the limit and rated current times applied voltage is the KVA.
The losses are mostly current based so the losses will be about the same.
The same losses on 1/2 the KVA will look like a drop in efficiency percentage.
Fun with numbers.
Compare the cost of the losses to the cost difference of a 240 Volt isolation transformer and you will probably use the transformer that you have.

Oh okay, awesome! So functionally it would work fine and not overheat or draw too much current or anything bad, just would have half the kVA rating? Which would be fine because it's rating is a little over double what my machine requires. Awesome!