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RE: Can I connect the output of 2 identical transformer to get double power?

Posted by jea48 (A) on May 4, 2015 at 07:45:03

In Reply to: Can I connect the output of 2 identical transformer to get double power? posted by akltam on May 4, 2015 at 06:21:13:

Yes, but you will need to make sure 100% they are in phase with one another. IF out of phase they will buck one another like two Bull Moose!

*****You must observe polarity markings on the two transformers being paralleled.******

Just to be on the safe side wire the two primary windings of the two transformers in parallel, observing polarity markings.

Next connect one secondary lead of one transformer to one secondary lead of the other transformer observing polarity markings. Leave the other leads of the two transformer's secondary windings open. Do not tie, connect, them together.

Energize the primary of the two paralleled transformers.

Next check for voltage between the two unconnected secondary leads of the two transformers.

IF the two transformers are wired in phase with one another you should measure zero or near zero volts. Near zero volts, like maybe just a few volts.

IF you measure twice the nominal secondary voltage of each transformer then the two transformers are not in phase with one another. They are wired out of phase.
Example, if the secondary output voltage of each transformer is 120Vac nominal and you measure 240Vac nominal, the two transformers are not wired in phase with one another.

• http://www.facilitiesnet.com/whitepapers/pdfs/schneiderelect   (Open in New Window)

Edits: 05/04/15

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