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Stepping down 200kv to 1kv

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Proud Mary

Fri Aug 30 2013, 10:29AM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Golly, I'm not familiar with this kind of apparatus, but best of luck with it all!

Andy

Fri Aug 30 2013, 09:13PM

Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874

Hi Proud Mary

I might have explained it in exotic ways :) , but it just a transformer driven from both sides on dc the other ac.

Thanks it would have taken days to allow the full power through. Adjusted the main inductor to 1H, and the driver to 0.00001H, the main inductor starts at inf ohms,Its not square more sharp peaks, but diodes and caps should fix that.
24Mohm at 25kw after 3.5seconds
450kohms at 29kw after 6.8seconds
405kohms at 29kw after inf seconds,
Out of a max of 59kw its 50% duty cycle.

Why would the ac resistance be 405kohms but it allows 29kw through at 345volts, strange

Redesigned the main inductor, it is now 1m3 square, mumetal core at 50k,k 25cm thick, with the wire being 25*30cm at 2 turns for 1H and 0.0000026ohms , the Al should come to about $2737

If the switching works a 100uf cap at 345volt should discharge in 2.6e-10seconds, with the inductor TC 380228seconds should have 8amps through it, the driver coil(0.0000008H, 3000 in parallel with 1 turn) should have a tc of 0.3seconds, at 2.6e-10 the switch will have a leakage current of 0.11amps, 3kohms to the cap, when the pulse is on the cap will supply 48Mamps through the inductor

Is any of these making sense??? Anyone

Andy

Sat Aug 31 2013, 07:04AM

Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874

I was wondering if someone could make a gerber file of

so I can get it fabricated.

Thanks

Steve Conner

Sat Aug 31 2013, 12:31PM

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

Whoa, let's take a step back here, what in the world is a "capacitor type" generator? Are we talking about an electrostatic machine?

The electrostatic machine might be theoretically more efficient, but by the time you factor in the losses in the extra apparatus you need to convert the output to a usable voltage, an ordinary generator probably wins, as it can be wound to give the voltage you want directly.

Proud Mary

Sat Aug 31 2013, 01:01PM

Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992

Andy, practical engineering design being dependent on constraints such as money, it's often best to proceed in a number of steps, such as:

A. A theoretical model derived from calculation and materials science etc.

B. A proof-of-concept model that shows that the big idea can be made to work on the bench.

C. A small scale pilot plant to investigate the scalability of the proof-of-concept model to a unit of full production size. What works in a little test tube may not work at all if you increase all dimensions and values by a hundred or a thousand.

Good engineering designs are typically subject to hundreds and thousands of revisions before a reliable product emerges at the end, so an enjoyment of tinkering will carry you a long way in this business. :)

Steve Conner

Sat Aug 31 2013, 01:15PM

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

Yes. Also bear in mind that electrostatic machines have imperfections too. An electrodynamic machine has losses caused by non-zero resistance of its copper windings and hysteresis losses in its iron core. Likewise, an electrostatic machine suffers from non-infinite resistance and dielectric losses in the parts that are supposed to be perfect insulators.

If you think you have found some sort of new physics that avoids these limitations, this isn't the forum for you.

Andy

Sat Aug 31 2013, 07:38PM

Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874

Hi Proud Mary
I'm almost at B), just need to get some more stuff cleared up. I'm not telling the whole truth, just don't want to stuff anything up.

Hi Steve Conner
No its not a PMM, but I could show you a drawing I made of one :)

Andy

Sat Aug 31 2013, 11:51PM

Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874

Just a rough drawing, its a pancake transformer with 3 turns for primary and 3 turns for secondary, with the current going the same direction. The other coil the current goes the other direction, coil two and three are switched at 100khz when three rises the second one falls, and vise verse, with three fully raising the voltage across one is max so no current goes through, when two is high one and two are in parallel and fully reach 5rc in 100khz.

1377993115 4266 FT156520 Transfomerswitch

I'm trying to follow this, coil one and three are below, coil one and two are the same but a + instead of a minus

Antonio

Sun Sept 01 2013, 02:41AM

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

Something is strange. Inductors with inductances in Henrys have usually hundreds or thousands of turns, and it's almost impossible to operate them at 100 kHz frequency due to leakage inductances (k<1) and stray capacitances. You can't use transformers as switches for DC currents. The average voltage on the resistive load at steady state depends only on the DC voltage. The transformers just add another waveform to it, taking the required power from the AC source.

Andy

Sun Sept 01 2013, 02:47AM

Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874

Hi Antonio
Yeah it is strange, the main inductor coil is the specs below

permeability 1.2566370614E-006
Number of turns 4
Area m/3 4
length 0.05
K 50000
Henrys 80.4247719296

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