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220 from 240/480

220 from 240/480

220 from 240/480

(OP)
how do I get 220 from a bank of 240/480 tramsformers?

RE: 220 from 240/480

220 volts is a standard utilization voltage in the USA.  The corresponding delivery voltage is 240 volts.  The difference allows for voltage drop in the LV distribution system.  220 volt equipment will work with a 240 volt supply.
 

RE: 220 from 240/480

Two ways:-
1. Reduce the voltage you are feeding them with.
2. Change the turns ratio.

You will need to give more specifics to get a half decent answer.
Regards
Marmite

RE: 220 from 240/480

check closer. Any equipment rated for 220 Volts may also be rated for 50 Hz.
220 Volts was a standard voltage in North America once but was uprated to 240 Volts about 50 years ago.
Why do you think you need 220 Volts?

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: 220 from 240/480

You need to provide more details.

Whatever is rated for 220V should be fine operating at 240V.

If the transformers are configured as 3-phase then you have 480V/277V.

The other common 3-phase connection is 208V/120V.

240V/120V is the common 1-phase house or small building feed.

We have no idea what power configuration you actually want.

RE: 220 from 240/480

Another configuration is the 240:480 delta. Many 240 Volt transformers will drop to 228 Volts on the minus 5% tap. What is your application? How many KVA do you need? Is this a school question? (trick question?)
Look at an auto-transformer or Variac.
 

Bill
--------------------
"Why not the best?"
Jimmy Carter

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