Finding information on balancing transformers for dual generators

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Sherman
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Does anyone know where I can find information on Balancing Transformers.
A co-worker asked me about them, and I have not had much luck finding information on them. I do know that they are used when you have duel power sources, like two generators. The transformer syncs the frequencys and balances the load. I know that there is a little power loss. ex: (2) 3kW generators are hooked up to a balancing transformer, and you are able to pull 5.5 kW out of them.
 
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You get the best efficiency from a, say 3-phase, transformer when each phase has the same load; both current and reactance.
 
Yes, but from my understanding, this is for use with single phase or three phase. I am mainly looking at the single phase application. Any ideals?