[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: pole pig ballast
Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Esondrmn-at-aol-dot-com>
In a message dated 1/16/02 7:16:21 AM Pacific Standard Time, tesla-at-pupman-dot-com
> Hey guys,
> I intend to use an arc welder to limit current to my pole pig. However,
> I would like to use a little resistance to "smooth" the power supply
> and make the system more easy to handle. Any advice on what sort of
> numbers I need here? This is especially important as I may series 2
> 11kV pigs and will have heaps of core to energize when the gap fires.
> Greg Peters
I use some large resistors that I bought from a surplus company. From memory,
they are 1.5 ohm 1,000 watt. They are about 3.0" in diameter and about 16"
long. I bought three of them, to use in various combinations, but normally
only use one. When running with a primary current of 30 amps, this resistor is
trying to dissipate 1,350 watts. It gets very hot. I have it mounted in a
steel frame and usually keep a large fan blowing on it. Prior to buying these
resistors, I used several electric stove oven elements in parallel. These were
difficult to mount into a frame and take up a large amount of space. I think
their resistance varies from about 15 ohms to 22 ohms so it takes quite a few
to build a one or two ohm resistor.