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Re: Homebrew HV trannie

The ARRL Radio Amateur's Handbook has some information on this (although I
am not sure about the more recent editions).  Another good source is this
book:

Lowden, Eric, Practical transformer design handbook, 2nd ed., Tab Books,
Blue Ridge Summit, 1989, ISBN 0-8306-3212-3
This is a fairly useful book dealing with transformer design at a practical
level without much theoretical detail. If you need to figure out what that
surplus transfomer is, or make/modify one from scratch, this is the book you
need. It takes the theoretical design information and puts it in a practical
context, as well as providing a lot of "rule of thumb" information


-----Original Message-----
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Thursday, February 17, 2000 5:40 AM
Subject: Re: Homebrew HV trannie


>Original Poster: "Jon Lagler" <rockcrawl-at-netzero-dot-net>
>
>
>----- 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
>
>Hi,
> 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..
>
>Thanks,
>Jon
>
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