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Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
Steve Conner wrote ...
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.
Important note, but I didn't say where the voltage was...
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
DrZoidberg wrote ...
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.
Probably works. Surely works at low voltages, but I imagine that eventually charges will track from the foil edges to the tube ends and leak by corona from there. An experiment would be interesting to see.
Registered Member #1221
Joined: Wed Jan 09 2008, 06:17PM
Location: Odense, Denmark
Posts: 196
The extension of the power line to Elektrostal, near Moscow in Russia was also designed to handle the full 1150 kV, but currently only operates at 500 kV. Moreover, the experimental transmission line in Beliy Rast, near Dmitrov in Moscow region, was also designed to be operated at 1150 kV, but later was disassembled.
From:
I wonder why they reduced the voltages.
I dont suppose anybody have some information on how exactly they generate these high voltages? I didnt think it would be possiable to insulate a transformer to withstand this but it seems I may have been wrong.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
An even more crazy idea: put what is effectively a really long vacuum diode up the inside of a TC, and use the oscillating E field to accelerate electrons up a long tube to a collecting electrode. A bit like a single stage RF LINAC. See attached quick pic.
Registered Member #2939
Joined: Fri Jun 25 2010, 04:25AM
Location:
Posts: 615
Timing (ie frequency). If a bunch of electrons have arrived at the torus of the TC as the field drops through zero, they will continue on through (they have speed) then be pushed away out the other side as the field from the TC goes negative. What arrives at the top terminal is a series of pulses. This is a well established method used in linear accelerators - they just use more stages.
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how to get 1 megavolt
