3- single ph vs 1- 3 ph transformer

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lemonman

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What is the lowdown, if there are 3- 112.5 kva pole mounted transformers, at some undefined primary voltage, for the electric service? What is the total secondary current, if the secondary voltage is 277/480v Y? I'm confused as to how this differs from 1- 112.5 kva 3 phase transformer.
Thanks for the help.
 
Three transformers, each rated 112.5 KVA can supply a _total_ of 337.5 KVA.

The current available at 480V is thus 337500 /480 /1.732 = 406A

-Jon
 
lemonman said:
What is the lowdown, if there are 3- 112.5 kva pole mounted transformers, at some undefined primary voltage, for the electric service? What is the total secondary current, if the secondary voltage is 277/480v Y? I'm confused as to how this differs from 1- 112.5 kva 3 phase transformer.
Thanks for the help.
Click to expand...

Why single transformer is more desirable in residential service is that you would loose only one/third of the customers on a single transformer failure.
 
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