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how to get 1 megavolt

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Dr. Dark Current

Fri Jul 27 2012, 02:47PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

I think the easiest besides a marx generator is the voltage multiplier under oil.
Then:
-an SGTC in single pulse mode with a large HV cap
-mains frequency transformer under oil
-tap the 400 kilovolt transmission line and put a voltage doubler on it

-in Soviet Russia, you tap the 1 megavolt line directly.
-collect atmospheric charge with a very high tower. During a thunderstorm, you get a bonus voltage.
-electrostatic generator machines (Van de Graaf, Wimshurst) scaled up

AuroraFlame

Fri Jul 27 2012, 02:51PM

Registered Member #5566 Joined: Tue Jul 03 2012, 10:55AM
Location:
Posts: 12

You can buy stun guns that say they produce over 1 million volts but Im sure that is bull!

GluD

Fri Jul 27 2012, 03:10PM

Registered Member #1221 Joined: Wed Jan 09 2008, 06:17PM
Location: Odense, Denmark
Posts: 196

I think you have to give up any ideas of tesla coils and transformers at this high voltage.

Considering the writer of this thread ask for 1 million volts DC, and ask if it can be done without Marx generators I find it rather suprising that half the replies regards exactly that, Marx Generators.

If I really needed 1 mega volt DC I would probably source it from a Van de Graaff or another electrostatic device. Probably insulated with sulfurhexaflouride to reduce the size and corona losses.

Wouldn't that be considerably cheaper than say a Cockcroftâ€“Walton multiplier?
Surely the diodes and capacitors for such a large device must be worth a fortune.

As have allready been said I dont think a Marx is relevant and I dont see how a Tesla Coil or a regular transformer should ever be able to do this.
So what else is left than electrostatics and the CW multiplier? I think that is the real question here.

Steve Conner

Fri Jul 27 2012, 03:16PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

No, in Soviet Russia, 1 megavolt line directly tap you!

On a related note, it is certainly easier to generate high voltage under oil, but depending on the experiment you want to do, you may have to bring it out into air. At that point the insulation requirements are almost as bad as if the whole generator were air insulated. You would need an oil-to-air bushing almost as big as a 1MV air-insulated multiplier stack.

Microwatt

Fri Jul 27 2012, 05:59PM

Registered Member #3282 Joined: Wed Oct 06 2010, 05:01PM
Location:
Posts: 224

can you build a 1 mv VDG for less than 500 dollars?

Antonio

Fri Jul 27 2012, 08:36PM

Registered Member #834 Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644

1 MV is not so difficult to generate. A Van de Graaff generator of moderate size can reach this value, even operating in plain air, but the terminal must have somewhat more then 33 cm of radius and be far from anything else by several times this value.
750 kV transmission lines are currently in use, and reach more than 1 MV of peak voltage (1061 kV):

Note the four conductors to reduce corona and the long insulators.
And 1 MV AC experimental lines have been built too:

Dr. Dark Current

Fri Jul 27 2012, 08:47PM

Registered Member #152 Joined: Sun Feb 12 2006, 03:36PM
Location: Czech Rep.
Posts: 3384

Antonio:

Steve Conner

Fri Jul 27 2012, 08:53PM

Registered Member #30 Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706

Sorry to spoil the fun, but the voltages for AC transmission lines are quoted between lines. The voltage between any line and ground is smaller by a factor of sqrt(3). So a 750kV line has 613kV peak to ground, not 1061, making insulation a good deal easier.

DrZoidberg

Fri Jul 27 2012, 09:41PM

Registered Member #350 Joined: Mon Mar 27 2006, 05:14PM
Location:
Posts: 106

Two VDGs, one with +500 kV and one with -500kV is probably the simplest solution.
The most expensive part of those VDGs would be the spheres. Except if you use two steel mixing bowls connected together. But then you have to somehow remove the rim.
I wonder of you really need a sphere at the top of a VDG. Can't you just use a plastic pipe and wrap aluminum foil around it? Would there be too much corona? Let's say the plastic pipe is 1 meter long and has a diameter of 40cm. Then you take a piece of aluminum foil, 1/2 meter wide and wrap it around the pipe. You'd still have 1/4 meter of insulating plastic on each side of the foil wrapped section. The foil would spray charge onto the plastic and the charged plastic should then prevent charge from concentrating at the rim of the foil.

Thomas W

Fri Jul 27 2012, 10:23PM

Registered Member #3324 Joined: Sun Oct 17 2010, 06:57PM
Location:
Posts: 1276

Sulaiman wrote ...

How about 111,111 9V batteries in series?

i think someone seriously needs to get a sponsorship from a battary company and see how many 12, 24v or whatever batterys they can stack and see how high voltage they can go!

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