I am planning to rewind 3 transformers and am looking for some information
regarding core plate insulation. The goal here isn't to save $- I know I could
pay to have them rewound, but rather to learn something by trying it myself.
I understand shellac was used for the insulation of individual plates in
the past- is this still done? Information about this is hard to come by- I
have been searching for months. If shellac is the way to go, what grade? I
assume dewaxed (super-blonde) is best, but I am guessing. Can I get by with
"blonde" (at 4.5% average wax content)? I cannot locate any information on the
"cut" of shellac either.
It was suggested to me to just use AC-43 spray on each plate but, given the
plates are all "used", I have to wonder if that will be create too much
build-up between plates & hence a larger core en toto. Another source
suggested that, after stacking dry, the stack be "shifted" to allow wicking of
varnish between plates. Without a coat of shellac as "insurance" that seems
risky.
Any information, or direction to a reference on plate preparation/assembly
would be appreciated.
Dave N3DB
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