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Re: transformer questions
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To: tesla-at-grendel.objinc-dot-com, KLINEDA-at-univscvm.csd.scarolina.edu, QUANTUM-at-univscvm.csd.scarolina.edu, WMEYER-at-scientia.up.ac.za, bhaley-at-shore-dot-net, frerichs-at-zfe.siemens.de, froula-at-cig.mot-dot-com, haba-at-snakemail.hut.fi, jetter-at-ix-dot-netcom-dot-com, scott-at-csustan.csustan.edu
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Subject: Re: transformer questions
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From: Esondrmn-at-aol-dot-com
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Date: Wed, 25 Oct 1995 11:25:37 -0400
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In a message dated 95-10-24 20:53:46 EDT, tesla-at-grendel.objinc-dot-com writes:
>To: tesla
>Subject: transformer questions
>
>Greetings all,
>
>I'm looking for a pole pig now and have some questions that I would like
>to know the answers to.
>
>1) Has/does anyone run a coil without any limiting ballast on the pig?
> In other words, has anyone cut the welder and oven elements entirely
> out of the circuit?
>
>2) Will these transformers blow up if they get shorted without any control?
>
> I already have an arc welder that I am going to use, but I am asking
> because one of the guys that my wife contacted wanted to ask me some
> saftey questions and I figured that I should know as many angles as
> possible. (It's not a surprise, but will be a great birthday gift :-))
>
>Chip
Chip,
I have not run my coil without any limiting ballast in series with the pole
pig. I have a 5kva 14,400 v transformer. I am running it with the welder
wide open and with 6000 watts of oven elements in parallel with the welder -
this is all in series with the input to the powerstat. This achieves a
primary current of between 35 and 40 amps which is approximately 8.2 kva. I
am comfortable there. I have fuses and breakers that would allow me to go up
about another 10 amps. I am concerned that if I fired it up with no ballast
I might get 50 or 60 or more amps in the primary. My 10 guage wire and my
breakers could not handle that. I would like to make a variable inductive
ballast to replace the welder so I could get the primary up to 40 to 45 amps.
The pole pigs are very conversatively rated. I know you can run them at
twice their rated capacity for several minutes and they don't even get warm.
If their outupt somehow gets shorted I am sure it would blow your breakers
or fuses before it harmed the pole pig. It would sure dim the lights in your
house.
Ed Sonderman