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rtarbell 20th January 2006 02:50 AM

Transformer wiring with different cores
I've found a different thread about a similar topic but the poster answered his own question...

When you have two (identical) secondaries, you can wind them in series for double the voltage, or in parallel for double the current handling (true, right?).

==> What if you have idedntical secondaries but they are wound on different cores? Do the same rules apply? I would think you can still put them in series and the voltages would still add, but I'm not sure anymore about putting them in parallel.

Eva 20th January 2006 04:26 AM

It depends on how the primaries are connected. For series primaries the secondaries may be connected in paralell even when they are not exactly identical, however, for paralell primaries you have to check whether both transformers have exactly the same turn ratios, because there will be parasitistic currents flowing from one transformer to the other otherwise.

AndrewT 20th January 2006 07:32 AM

for parallel primaries I agree with Eva. Take care with paralleling transformers.
Series primaries ????
Series secondaries is OK for transformers that are nominally the same.
But keep in mind the voltage stress if you are using high voltage transformers. Peak voltage to ground and peak voltage to primary must both be below the maximum the transformer can take as a working voltage.

Eva 20th January 2006 07:46 AM

Primaries may be freely connected in series when similar secondaries are connected in paralell, since the secondaries will equalise the primary voltage.

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