Re: Heat from pig resistance.
Tesla List wrote:
> >From Esondrmn-at-aol-dot-com Tue Dec 3 22:58:58 1996
> Date: Tue, 3 Dec 1996 14:55:16 -0500
> From: Esondrmn-at-aol-dot-com
> To: tesla-at-pupman-dot-com
> Subject: Re: Heat from pig resistance.
> I forgot to mention that I was using the oven elements in parallel with the
> welder. That is why they aren't too hot at this point, all 20 or 30 amps of
> primary current wasn't flowing through the elements. I plan to try using
> them in series and then they will probably get real hot. At 20 amps primary
> current and 6 elements in parallel for a total of 4 ohms, it would dissipate
> 1,600 watts. At 30 amps primary current it would be 3,600 watts.
> This points out a problem that I had not thought about - which is if the
> resistance is used in series with the inductive ballast, you need much lower
> resistance. I believe Richard Hull said he used .5 ohms. If I am going to
> use 2000 watt oven elements, I would need 50 of these in parallel to get down
> to .5 ohms. I can see why you need to go down to .5 ohms - if you use even 1
> ohm at 30 amps, you are going to drop 30 volts across the resistor and loose
> about 14% of your total input power right there.
> For those who are using series resistance, what are you using?? It can't be
> 50 oven elements.
> Ed Sonderman
I used the resistance in series with my inductance. I use a special high
resistance stainless steel rod element system. A single unit of 4,
1 meter wires is more than adequate, and tappable with bolts. I
haven't used heaters or the like since 1990!
Richard Hull, TCBOR