Re: Homebrew HV trannie

To: tesla-at-pupman-dot-com
Subject: Re: Homebrew HV trannie
From: "Jon Lagler" <rockcrawl-at-netzero-dot-net> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)
Date: Wed, 16 Feb 2000 20:18:28 -0700
Approved: twftesla-at-uswest-dot-net
Delivered-To: fixup-tesla-at-pupman-dot-com-at-fixme

Hi, me again,
 Now you've got me thinking about the non-working welder I have sitting
here. From what I've gathered from previous posts, the size of the window in
the core will be the problem. It will be tough to get enough wraps on the
secondary without "running into" the core.
 I think it would be OK to reuse the original primary windings (if still
good). The welder I have is rated for 230v/30A on the primary. This makes
for a  6.9kvA trany (minus losses) right? Power in = power out (again, minus
losses). It looks like mine has two separate coils on the same core with
various secondaries wound on top of the primaries. If I remove the
secondaries and rewind them for say 15kv, I should get about 460mA. I found
a site with some good transformer info. Nothing about high voltages, but
still lots of great info.
<http://members.tripod-dot-com/~schematics/xform/xformer1.htm>

Jon
----- Original Message -----
From: Tesla List <tesla-at-pupman-dot-com>
To: <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?
>
> Thanks,
>
> Grayson Dietrich
> http://www.electrophile.8m-dot-com
>
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