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4hv.org :: Forums :: High Voltage
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Stepping down 200kv to 1kv

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BigBad
Fri Aug 16 2013, 08:58PM
BigBad Registered Member #2529 Joined: Thu Dec 10 2009, 02:43AM
Location:
Posts: 600
I'd probably use a Tesla coil, they're made for this kind of HV thing, but you'd lose the harmonics.

You could use several Tesla coils, each tuned to different harmonics I suppose.
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Sulaiman
Sat Aug 17 2013, 02:15AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
There is NO WAY that you can produce a 200 kV change in 1 ns ( 2 x 10^14 V/s )
anf then hold it for 1 ms.

200 kV at 1 A squarewave is 100 kW average.

Maybe you need a re-think !
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Andy
Sat Aug 17 2013, 02:47AM
Andy Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
There is NO WAY that you can produce a 200 kV change in 1 ns ( 2 x 10^14 V/s )
anf then hold it for 1 ms.

200 kV at 1 A squarewave is 100 kW average.

Maybe you need a re-think !
100kw isn't much, but besides that the input voltage would be 2000volts square wave.....
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Sulaiman
Sat Aug 17 2013, 05:33AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
Explain the (proposed) setup and we can explain why it will not work,
e.g.
in air, to support 200 kV without sparks/arcs a minimum radius of conductors would be 66mm
just a sphere of 66mm radius would have a capacitance of about 7.3 pF
1,467 A would be required to change the potential of this small sphere by 200 kV in 1 ns
IF you could make a transformer 2 kV : 200 kV = 1 : 100
the primary currnet would be 146,666 Amps !
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Andy
Sat Aug 17 2013, 06:30AM
Andy Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Explain the (proposed) setup and we can explain why it will not work,
e.g.
in air, to support 200 kV without sparks/arcs a minimum radius of conductors would be 66mm
just a sphere of 66mm radius would have a capacitance of about 7.3 pF
1,467 A would be required to change the potential of this small sphere by 200 kV in 1 ns
IF you could make a transformer 2 kV : 200 kV = 1 : 100
the primary currnet would be 146,666 Amps !
Would a transformer wired like the diagram above work to make a square wave. You have 2000volts that can be switched at 1ns-10ns, the current is say 100mA, the transformer steps that upto 200kV and 1mA, would the transformer wired so the voltage from the dc source(200kV, 1A-10A) be anti each other produce a square wave.
The simulation software says yes, but that doesn't say much....
The genny-set is a capacitance genny, not magtnic, that runs 200kV.
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Sulaiman
Sat Aug 17 2013, 07:31AM
Sulaiman Registered Member #162 Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3141
In your simulation put a few pF from the 200 kV terminal to 0v/ground and see what happens.

Fundamental physics; I = C.dV/dT .. dT = C.dV/I

e.g. C=5pF, dV=200kV, I=1mA ... dT= 1ms rise-time....1,000,000 ns
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Andy
Sat Aug 17 2013, 07:05PM
Andy Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
Thanks Sulaiman, the simulation showed more of a sawtooth
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Andy
Mon Aug 19 2013, 06:34AM
Andy Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874
How would you lot design coupled inductors, in the 7kv range. It needs to have low ohms and high inductance. Any far out designs welcome :)


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Andy
Fri Aug 23 2013, 06:23AM
Andy Registered Member #4266 Joined: Fri Dec 16 2011, 03:15AM
Location:
Posts: 874

1377235761 4266 FT1630 Scemtic

This is what I've got so far, a joule theitf type setup, I think the capacitance of the transformer can be lowed if the case is charged up to wire voltages, the scope on the primary of the transformer is square, but adding a cap to ground will phase shift it?.

Any ideas on building the two coupled inductors, I'm thinking 30 turns covering 1.5m with the 4cm*10cm wire melted in a furnace...
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radiotech
Fri Aug 23 2013, 09:48PM
radiotech Registered Member #2463 Joined: Wed Nov 11 2009, 03:49AM
Location:
Posts: 1546
As a thought experiment, consider the sources as the energy to activate
an EMP fixture, i.e. shock-excite a tuned line, terminated in copper sulphate resistors.

Then couple the characteristic of the known EMP signature into tuned circuits
whose characteristic impedance yields the current and voltage you desire.


1377294484 2463 FT156520 East Hanover Emp

1377294484 2463 FT156520 East Hanover 200  Kv Pilse Generator
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