Subject: RE: Suggestion for current limiting
Date: Mon, 26 May 97 05:23:38 UT
From: "William Noble" <William_B_Noble-at-msn-dot-com>
To: "Tesla List" <tesla-at-pupman-dot-com>
good idea, but beware of 2 things:
1. steam production - if you seal the pipe it may well explode
2. I wouldn't be too suprised to see the resistance decrease with time
as ions
are pulled off of the electrical contacts, but it would be an
interesting
experiment. If the resistance did decrease with time, then the circuit
could
"run away" and that could be a problem.
-----Original Message-----
From: Tesla List
Sent: Sunday, May 25, 1997 5:02 PM
To: tesla-at-poodle.pupman-dot-com
Subject: Suggestion for current limiting
Subject: Suggestion for current limiting
Date: Sat, 24 May 1997 17:03:33 +1000 (EST)
From: Rodney Davies <rgd872-at-anu.edu.au>
To: tesla-at-pupman-dot-com
Hi all,
Ever thought of current-limiting that 10KVA pig-pole transformer with
water?
Since water in it's pure (distilled) form is a perfect insulator, since
there are no impurities or free ions to conduct electrons.
I built a resistor out of 1" diam PVC pipe, about 6 feet in length,
plugged at each end with feed-thru conductors, where I filled the pipe
with distilled water, then added tap water to give it conduction.
While adding the tap water, I was continuously measuring the resistance.
Once I reached the required resistance, I plugged it up.
The beauty of this resistor is that it can dissapate heat very well, so
it's ideal for current limiting and I haven't had any problems at all
with
operation.
The costs was < $10 as I mostly had all the parts lying around the
house...
Well, there's a cheap solution if you don't have an arc-welder! :-)
My suggestions for the day...
Catchya!
Rod