Re: 'Alternative' isolation transformer
Some confusion over VA and watts going on here.
Magnetizing current is mostly wattless, except for the losses from winding resistance and in the imperfections of the magnetic core- hence 30VA of winding volts * winding current may only be 5 Watts of losses.
However, the first TX will still have to deliver the current involved in the wattless VA of the second TX so yes, the total power available from the second TX will be less to allow for this without overloading the first TX.
With the setup running, check that none of the winding currents in the various transformers exceeds its VA rating when multiplied by the voltage across the winding in question. Nothing will heat up fast enough to damage anything during the "on" time it takes to make the measurements.
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