Re: Homebrew HV trannie
----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
Sent: Tuesday, February 15, 2000 6:44 PM
Subject: Homebrew HV trannie
> Original Poster: "Grayson B Dietrich" <electrofire-at-juno-dot-com>
> Hello, All
> as long as the subject is up again, I'll ask this. Would the transformer
> cores from a large (250A) arc welder seem suitable for a rewind as HV
> transformers? I may be able to get my hands on a scrapped unit, with
> three very large such transformers in it. One has the variable core
> shunt, the other two don't have any mena of adjustment. But, there is a
> high/low current setting switch on it, so it may switch one or both of
> them in or out of circuit, I suppose.
> They seem rpime for a rewind, as the only thing holding on the "I"
> section of the E-I core are little strips of metal thinly welded on. A
> few minutes with an angle grinder will take care of it.
> I'm not sure what can wear out on an arc welder, but the people who have
> it tell me that it is unusable. Each core (E-I style) seems to have about
> a 16"^2 cross section. How many kVA could I push one too?
> Grayson Dietrich
I have a 160 amp mig welder that was scrapped because of a bad transformer.
I may consider converting it for TC use if it doesn't seem like a huge deal
of trouble. It has a variable core which I think would be great for varying
the power to the TC. Where can I find info on building a transformer, such
as # of turns and wire guage, etc..
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