Re: Home made transformer
Hi Tim, insulation is one of the bugbears of transformer design, especially if you sell it on it has to meet all sorts of regulations; even if only for your own use.
For some transformers, where the sec winding "floats" it needs good insulation between the low end of the HT winding and the pri & core.
This was a feature of the so called "admiralty pattern" transformers.
For a small dedicated transformer you will have a high t/v figure and lots of turns as well as lots of insulation (grade 2, double insulated wire helps). It will be innefficient, but the actual losses will be low anyway.
If possible the best method may be to use a slightly larger transformer and put your HV winding on last. Plenty of interwinding insulation and possibly about 3mm od "margin tape" to space the HV winding away from the bobbin cheeks.
Good luck, Ed
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