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RE: T&R pole pigs..
Stephan:
This should not be a problem. The resistor in my ballast system is more to
smooth
out any peaks in the current draw (perhaps, I'll try running without it
after
I calibrate the welder).
It is a true power resistor, not a heating element. Rated at 1KW, the most
it will have to dissapate is about 360W, above that my fuses will blow.
Michael Baumann
Coiler, Homebrewer, Nerd. mycroft-at-access1-dot-net
> -----Original Message-----
> From: Tesla List [mailto:tesla-at-pupman-dot-com]
> Sent: Thursday, November 12, 1998 3:29 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: T&R pole pigs..
>
>
> Original Poster: Steve Rodway <Legion-at-bigfoot-dot-com>
>
> Tesla List wrote:
>
> > BTW: someone on the list tell me if I am wrong, but think
> > I have figured out how to inexpensivly measure my current
> > draw. I thought about current transformers, etc.. then
> > as I was figuring out the wiring for the ballast + the series
> > resitor (0.4ohm -at- 1KW, used, $15.00) I realized that I could
> > get both average and peak current draw via voltmeters.
> >
> > Average: Connect 0-15VAC meter aross resistor. Voltage follows
> > at 0.4*current draw.. so at my planned max of 30A, I see 12V.
>
> Be careful with this, the resistance of your ballast may not be a
> constant,
> if it is composed of heating elements, then there will be a positive
> temperature
> co-efficient, and it may also not be a pure resistance
>
> --
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