120/208-3Ph to 1Ph Transformer Secondary Voltage

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If I have 120/208v-3Ph and put in a single phase transformer. Does the secondary become 120/240v-1Ph or 120/208v-1Ph?
I'm sure it's the former but it's always good to check.

Thank You

If you want to power 120V to neutral or 208V phase to phase loads without a neutral you do not need a transformer. You can connect a single phase transformer phase to neutral or phase to phase on a 208/120V service and make 240/120V single phase with a neutral. What is it you are trying to accomplish?
 
220525-0953 EDT

designer82:

Think about the question you asked.

What are the characteristics of a single phase transformer?

First, you said it was a single phase transformer.
This would generally mean one primary winding. In turn this one winding might be made up of various series and/or paralleled windings appropriately connected to be the equivalent of one single two terminal winding.

Second, this means one or more secondaries connected in one or more single windings can only produce output phases of 0 or 180 degrees.

Third, what output voltages are produced is based on the turns ratio between the primary, and a particular secondary,

Your question as stated is "Does the secondary become 120/240v-1Ph or 120/208v-1Ph?" It depends upon what the turns ratio is between your primary and secondary of interest. See if you can answer your own question.

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If I have 120/208v-3Ph and put in a single phase transformer. Does the secondary become 120/240v-1Ph or 120/208v-1Ph?
I'm sure it's the former but it's always good to check.

Thank You

You wouldn't really have a 208/120 three phase. You have a primary coil and a secondary coil. In your case this would likely be a 208V primary using one phase of the 3 phase source, to a 120/240v secondary. Or a 120V primary.
 
You can pretty much specify the voltage you desire but I'd venture that 95% of the time it would be a 120/240.
 
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