It took me ages to find a suitable transformer that didn't cost several limbs, and while my load at the moment is well within it's rating, I'm curious as to what power rating I can assume for this setup. It's not too important because the total load I have planned on 240V is only 160W, so at 120(ish)V is going to be under 100W anyway, and at 60(ish) V will be less.
It's a standard open frame isolating transformer, 115V pri, 60-0-60V sec (Hammond 186F120), which I've wired as an autotransformer to get (roughly) 1/2 and 1/4 voltage to dim some lights.
The transformer is rated 102VA as an isolating transformer, but I'm not quite sure about what load it will support in this configuration. My assumption is that on the 1/2 connection, it'll support (approx) 200W - with 100W passed through the pri to the load, and the same 100W transformed via the secondary into the load to give (approx) 200W total.
But what's the calculation for the 1/4 tapping ?
It's a standard open frame isolating transformer, 115V pri, 60-0-60V sec (Hammond 186F120), which I've wired as an autotransformer to get (roughly) 1/2 and 1/4 voltage to dim some lights.
The transformer is rated 102VA as an isolating transformer, but I'm not quite sure about what load it will support in this configuration. My assumption is that on the 1/2 connection, it'll support (approx) 200W - with 100W passed through the pri to the load, and the same 100W transformed via the secondary into the load to give (approx) 200W total.
But what's the calculation for the 1/4 tapping ?