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From: D from BC on 14 Mar 2010 14:01
In article <MyNameForward-F1A584.13064814032010(a)mail.eternal-
september.org>, MyNameForward(a)ReplaceWithMyVices.Com.invalid says...
>
> In article <MPG.2605e3e6e5d856be989707(a)209.197.12.12>,
> D from BC <myrealaddress(a)comic.com> wrote:
>
> > iic resistivity of pure water is 18.2Mohm cm^2/cm at 25C
>
> Ultrapure water is a great insulator. It's also "not found in the wild"
> and takes constant deionization filtration to maintain in an ultrapure
> state. If you go putting copper in it, it won't be staying ultrapure.
> One of our pulse machines did use it (with stainless steel inner and
> outer conductors) as the insulator for a coaxial line about 5 feet in
> diameter (outer - inner was about 18 inches as I recall.) Transformer
> oil was used for most applications requiring high-voltage and access to
> parts - presumably the water gave a better capacitance for the
> transmission line in that case (I worked on them, I didn't design them).
>
> From the practical point of view, the string of carbon (or wire-wound)
> power resistors (or multiple strings in parallel if need be for power
> handling) is simpler to implement, has no leaking fluid potential, and
> is often cheaper. Strings of 2-watt resistors inside a vinyl tube (no
> doubt not helping with power handling, but making them safer as far as
> inadvertent shorting) were a common way to get a high-voltage resistor
> without breaking out the big bucks (research budgets are not generally
> lavish) for all-in-one piece high voltage resistors. Better cooling can
> be had by wiring them into perfboard instead.

Since I make my own boards, I might order 50 2k 1/4W chip resistors.
0.05 cents each * 50 = $2.50
I could solder paste and solder (one shot) on a hot plate.
Or...
Use I could use throughhole R and perf board.


From: John Larkin on 14 Mar 2010 14:13
On Sat, 13 Mar 2010 17:24:15 -0800, Archimedes' Lever
<OneBigLever(a)InfiniteSeries.Org> wrote:

>On Sun, 14 Mar 2010 10:36:15 +1100, Grant <omg(a)grrr.id.au> wrote:
>
>>I dunno, 2kV + open water still sounds like Bang! to me ;)
>
>
> Would not do anything with pure water.

This is Sandia's Z-pinch fusion machine. All the final HV stuff is in
a big swimming pool, insulated by pure water.

http://zpinch.sandia.gov/Z/Images/z.jpg

http://www.sandia.gov/media/images/jpg/Z02.jpg

"When the accelerator fires, powerful electrical pulses are delivered
by 36 transmission cables protected by insulation techniques developed
over the last 30 years. Highly synchronized laser-triggered switches
allow the stored energy to be discharged simultaneously through the 36
cables, each as big around as a horse and 30 feet long, arranged like
spokes of a wheel and insulated by water. The enormous electrical
pulse of 50 trillion watts strikes a complex target about the size of
a spool of thread."

John

From: D from BC on 14 Mar 2010 14:32
In article <4B9D215D.E71EB920(a)earthlink.net>, mike.terrell(a)earthlink.net
says...
>
> Ecnerwal wrote:
> >
> > In article <MPG.2605e3e6e5d856be989707(a)209.197.12.12>,
> > D from BC <myrealaddress(a)comic.com> wrote:
> >
> > > iic resistivity of pure water is 18.2Mohm cm^2/cm at 25C
> >
> > Ultrapure water is a great insulator. It's also "not found in the wild"
> > and takes constant deionization filtration to maintain in an ultrapure
> > state. If you go putting copper in it, it won't be staying ultrapure.
>
>
> The RCA TTU-25 series transmitters had over 7 KV across the water in
> the cooling system. the was a monitor to constantly test the purity. I
> believe the trip point was 100 MOhm per cubic centimeter where it would
> shut down the transmitter. It's been almost 20 years since I've seen
> one of them.

Neato... Perhaps I can call it 'wetware' :P

From: Archimedes' Lever on 14 Mar 2010 14:53
On Sun, 14 Mar 2010 11:13:58 -0700, John Larkin
<jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote:

>This is Sandia's Z-pinch


That was my desktop wallpaper 8 years ago, idiot.
From: D from BC on 14 Mar 2010 14:59
In article <2j9qp5lmcc34ql8r7q3gulefivsrhlrui4(a)4ax.com>,
jjlarkin(a)highNOTlandTHIStechnologyPART.com says...
>
> On Sat, 13 Mar 2010 17:24:15 -0800, Archimedes' Lever
> <OneBigLever(a)InfiniteSeries.Org> wrote:
>
> >On Sun, 14 Mar 2010 10:36:15 +1100, Grant <omg(a)grrr.id.au> wrote:
> >
> >>I dunno, 2kV + open water still sounds like Bang! to me ;)
> >
> >
> > Would not do anything with pure water.
>
> This is Sandia's Z-pinch fusion machine. All the final HV stuff is in
> a big swimming pool, insulated by pure water.
>
> http://zpinch.sandia.gov/Z/Images/z.jpg
>
> http://www.sandia.gov/media/images/jpg/Z02.jpg
>
> "When the accelerator fires, powerful electrical pulses are delivered
> by 36 transmission cables protected by insulation techniques developed
> over the last 30 years. Highly synchronized laser-triggered switches
> allow the stored energy to be discharged simultaneously through the 36
> cables, each as big around as a horse and 30 feet long, arranged like
> spokes of a wheel and insulated by water. The enormous electrical
> pulse of 50 trillion watts strikes a complex target about the size of
> a spool of thread."
>
> John

Cool.. :)
Looks like something out of a sci-fi movie..

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