Re: Problems with current limiting system
It looks as if you shorted it.
A similar test was conducted by a memeber on the list with a variac.
Even though it wasn't a straight rod, the properties of the iron are similar
While putting 120 on a 120v variac, it drew a very small current to energize
the core (I forget the exact value). By putting 240v on the variac, if
the voltage would have doubled the current correctly, the variac would still
been able to survive under it's current rating. However, the variac core
and drew more than the double current rating it had. I believe this problem
might be occuring for you as well.
From: Tesla List <tesla-at-pupman-dot-com>
To: tesla-at-pupman-dot-com <tesla-at-pupman-dot-com>
Date: Saturday, July 24, 1999 3:14 PM
Subject: Problems with current limiting system
>Original Poster: "Coiler" <mycroft-at-access1-dot-net>
>Well, I just got a nasty surprise, and am looking for input from
>someone that is more familiar with this than I.
>I wound an iron core coil, hoping to use it as a limiter for my pig.
>about 10lbs of iron wire form a straight core. I wound about 400 turns
>of 10AWG wire on this. Measuring current with my 110V variac
>I found that I got 10A at 130V. So I figured I would get around 25A
>at 240. Boy was I wrong.
>Wired in series with my pig, shorted pig output. Meter shows 83A being
>and considering how the wires were jumping, I'd belive it.
>Is it possible I saturated the iron, even though it is a straight rod?
>Coiler, Homebrewer, Nerd. mycroft-at-access1-dot-net