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Re: Suggestion for current limiting
Subject: Re: Suggestion for current limiting
Date: Mon, 26 May 1997 02:07:30 -0400 (EDT)
From: Jeremy Bair <pwac-at-flinet-dot-com>
To: Tesla List <tesla-at-pupman-dot-com>
On Sun, 25 May 1997, Tesla List wrote:
> 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 dissipate heat very well, so
> it's ideal for current limiting and I haven't had any problems at all
> with
> operation.
>
> The costs was < $10 as I mostly had all the parts lying around the
> house...
>
> Well, there's a cheap solution if you don't have an arc-welder! :-)
>
> My suggestions for the day...
>
> Catchya!
> Rod
Hey Rod,
Sounds real nice, but LONG! It sounds like transportation of a PVC
pipe 1" x 72" would be difficult, especially if you want to take it to
some place in a car.
One Question, since most arc welders allow you regulate the power,
is
there a way to design this type of resistor with some sort of regulation
control? Maybe two small pumps (Maybe the cheap Windshield wiper fluid
pumps that you can get from Auto Magazines for 5-10$) to add both of the
separate waters (Tap and distilled).
Put a pump on one end to control distilled water being entered and a
pump (or a solenoid valve) to control the tap water going in. Stick some
sort of valve on the other end to let the water mixture out. Sounds like
a
cool idea. It actually may work really well, the only problem I see with
it
is that the distilled water may not mix quick enough and may actually
start
to lower the resistance after the pump has been shut off, same with the
tap water. But it would produce a cool smooth effect when showing it off
to people.
Or how about making a bunch off water resistors, like 10 or more, or
however you may need. And measure them out from high resistance to low
resistance, and use something like jumper cables to quickly switch the
resistors, this would probably work the best, especially if you have
them
all sitting in the same area where you can easily just changed the
resistors.
I'm going to stick with my neons for now, but at one time in the
future I think it would be great to get into pigs, but the money I'm
going
to use for the pig will definitely not leave me enough to purchase an
arc
welder :)
Thanks for posting this helpful info!
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