OK, but is it 240v input, and 240v output you want, or what combination..?
If you mean 110v primary:110v secondary transformers - you could connect two transformers with both primaries in series and two secondaries in series, and apply 240v to get a 240v:240V composite transformer, but it's not a good idea on the whole.
If you mean 110v primary:110v secondary transformers - you could connect two transformers with both primaries in series and two secondaries in series, and apply 240v to get a 240v:240V composite transformer, but it's not a good idea on the whole.
Then just connect the two primary -side windings in series. You can leave al teh secondaries uncommitted.
Don't expect this to be very useful. Use a minimum-value mains fuse etc. Assuming good matching, these transformers will be seeing 120VAc each, but it's not guaranteed: if wildly different in VA capacity, the smallermay be exposed to even higher voltages . Even more seriously, if they are wound for 60Hz (US etc) mains, the cores will be under-sized for use in the UK anywhere near rated capacity, and I would expect them likely to hum badly. HTH!
Don't expect this to be very useful. Use a minimum-value mains fuse etc. Assuming good matching, these transformers will be seeing 120VAc each, but it's not guaranteed: if wildly different in VA capacity, the smallermay be exposed to even higher voltages . Even more seriously, if they are wound for 60Hz (US etc) mains, the cores will be under-sized for use in the UK anywhere near rated capacity, and I would expect them likely to hum badly. HTH!
the problem IMO is that having transformers in series they must supply the same power otherwise you will get an inbalance between the transformers and the output voltages will vary.
I suggest you use one with the correct primary or use a 230/110 autotransformer to drive the 110 devices in parallel.
I suggest you use one with the correct primary or use a 230/110 autotransformer to drive the 110 devices in parallel.
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