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4hv.org :: Forums :: High Voltage
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grounding for a marx generator

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PanosB_GR
Mon Nov 10 2008, 05:38PM
PanosB_GR Registered Member #1680 Joined: Fri Sept 05 2008, 04:19PM
Location: Greece
Posts: 43
To Harry:

What I was referring to in the first place, was a way to get the 50kV out of the charging unit, since i do not have the original cable that came with it. I assume that I can use rg-218 cable (has adequate insulation tihckness), in order to charge the bottom of the marx bank.
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Proud Mary
Tue Nov 11 2008, 12:14PM
Proud Mary Registered Member #543 Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
PanosB_GR wrote ...

To Harry:

What I was referring to in the first place, was a way to get the 50kV out of the charging unit, since i do not have the original cable that came with it. I assume that I can use rg-218 cable (has adequate insulation tihckness), in order to charge the bottom of the marx bank.


I am sorry to have misunderstood you, Panos.

I do not know the specifications of your coaxial cable , but if it has a withstanding voltage of at least 75kV it should be suitable for use at 50kV continuous operation (I am a cautious man!) though I see no need to use coaxial cable at all in this application.

May I make a suggestion here? With all but small Marx generators there is a risk of a big 'kickback' into the power supply when the Marx fires, which could easily destroy it.

One solution to this is to disconnect the power supply the moment before firing. Vacuum switches/relays are excellent if you can find one that is not too expensive, but otherwise you can build a fast sprung-loaded electro-mechanical switch to do the same job.

With this approach, you have to 'trigger' the Marx, rather than waiting for it to fire in its own time, but it is much more reliable, and safeguards the power supply. Very high voltages can sometimes appear in places we do not expect or want them! cheesey
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