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Generators & Electric Motors General Discussion

Three Phase to Single Phase via Transformer


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  #1  
Old 08-31-2012, 06:08:28 PM
Gunny Gunny is offline
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Default Three Phase to Single Phase via Transformer

Where can one find a 3 phase to single phase transformer?

Can you draw out the connections for one?
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Old 08-31-2012, 06:32:15 PM
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Talking Re: Just bought a 2006 Onan 7.5HDKAL-3E Need some help

Actually in theory one could make, or wind one, but in practice NO ONE does, so it is just Theory. There is NO Practical difference between a Three Phase Genend, and a Three Phase Transformer Secondary. If one had a Three Phase Delta, or Wye, wound Primary Triple Core Transformer, and then wound what would be a 12 Lead Secondary with 2 Coils, on each of the Three Cores, you would have exactly what you are looking for... A Three Phase to Single Phase Transformer with all the same connection diagrams that a 12 Lead Genend can produce. This would include a Parallel Delta, or Double Delta Configuration. The math works out the same, in either case. Just Say'en.....
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Old 09-05-2012, 10:22:35 AM
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Default Re: Three Phase to Single Phase via Transformer

And the upshot of this exercise is that the single phase connected secondary will always have a lower capacity than when it's connected 3 phase.

The best you can do is to balance the load seen by the primary as well as possible which is what all the single phase reconnections accomplish.
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Old 10-14-2012, 10:15:29 AM
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Default Re: Three Phase to Single Phase via Transformer

I'm wondering what the original post is really asking. Is it that he wants to connect a single phase, say 120V load to a 480V 3-phase supply? Or is it that he has a 3-phase generator and wants use a transformer to 'convert' it for use with a single phase load? Is he hoping for a transformer-based circuit that somehow skirts around the 2/3 capacity reduction? Or something else?
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Old 10-14-2012, 12:26:23 PM
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Default Re: Three Phase to Single Phase via Transformer

Jim,

I would guess the question is related to something like this:

http://www.nuteckproducts.com/three-...ansformers.htm


People seem to want a way to pump their 3-phase genset into a transformer and get the single phase 240V "house power" out of it, so the full capacity of the generator can be utilized. Transformer would need to be sized so single phase KVA output equaled that of the generator's capacity. A cost-prohibitive venture in my opinion.


This kind of transformer is not going to be on anyone's shelf in a warehouse I suspect; custom-built to your requirements.

eric
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Old 10-15-2012, 12:16:25 PM
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Default Re: Three Phase to Single Phase via Transformer

OK, well I'm curious about the connections for that "3-phase to single phase" transformer, too...
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