Re: The Geek Group High Voltage Capacitors, making a HV switch, (fwd)

["High Voltage list" <hvlist@xxxxxxxxxx>]

Original poster: Steven Roys <sroys@xxxxxxxxxx>



---------- Forwarded message ----------
Date: Wed, 8 Nov 2006 21:24:12 +0800
From: Peter Terren <pterren@xxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>
Subject: Re: The Geek Group High Voltage Capacitors, making a HV  switch,
      (fwd)

I still prefer string. How long is a piece of string? You work that out 
yourself. Perhaps 10 foot per kJ. Non conductive and as long as you like.
Just my lo-fi solution. Has worked 100% from amy direction.

Peter
http://tesladownunder.com

> ---------- Forwarded message ----------
> Date: Wed, 8 Nov 2006 00:44:45 -0800
> From: Jim Mora <jmora@xxxxxxxxxxx>
> To: 'High Voltage list' <hvlist@xxxxxxxxxx>
> Hi Jim, Bert and et al,
>
> So what is a safe distance BTW components or more directly Buses with
> rounded edges or Hard copper pipe to go out and make a return path for a
> wire blow?. I seem to remember 40KV/in. I have the break down chart
> somewhere but that deals in needle points and spheres.
>
> I have read that Ed Wingate does a similar configuration as this: He uses 
> a
> mongo knife switch. What would be a safe handle length for a charge, open
> (the scary one), and bleed down using a reconstructed knife switch with 
> four
> copper poles tied together on each side of center and moved to a larger 
> arc
> space, (phenolic and G10 base) and I am talking feet for the handle,
> sideways, with baffles. I have 5 100K ceramic 12"x1 1/8" Shallcross 150C-
> one each would maybe be enough. Current limit the PS, bleed down the
> remaining charge or be able to do a full bleed in an emergency situation
> without welding the switch.
>
> The switch would be in the center position (disconnect to the PS EXCEPT to
> the 40+KV caps for fire). This would be mounted sideways, the HV return
> would be behind it. The main discharge is much like Bert's Switch. Two 2"
> brass dowels and a 2" bore 4 inch movement single stage Pneumatic 
> actuator.
>
> I plan to back off of from this event. I have a portable air tank and a 
> hand
> discharge switch that I would operate from several feet away using Tygon
> tubing and the tank by my side. Should wake up a crowd, yes?
>
> The handle to the knife switch raises my hair a bit. What is your
> recommendations. I would rather not automate it as it is for demonstration
> and people can visually see what is being done. What do line man wipe 
> their
> "Jesus" sticks with. Mineral oil, silicone? I was thinking of making a 
> 1.5"
> schedule 40 three to four feet long stick and caping the user end, adding 
> an
> internal baffle on the knife switch handle end. Near the user would be 3
> increasing in size exterior baffles.
>
> Your thoughts Please?
>
> Thanks Jim Mora