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: Fri, 10 Nov 2006 08:13:22 -0800
From: Jim Lux <jimlux@xxxxxxxxxxxxx>
To: High Voltage list <hvlist@xxxxxxxxxx>, hvlist <hvlist@xxxxxxxxxx>
Subject: RE: The Geek Group High Voltage Capacitors, making a HV    switch,
      (fwd)

At 09:24 PM 11/9/2006, High Voltage list wrote:
>Original poster: Steven Roys <sroys@xxxxxxxxxx>
>
>
>
>---------- Forwarded message ----------
>Date: Thu, 9 Nov 2006 17:37:34 -0800
>From: Jim Mora <jmora@xxxxxxxxxxx>
>To: 'High Voltage list' <hvlist@xxxxxxxxxx>
>Subject: RE: The Geek Group High Voltage Capacitors, making a HV   switch,
>       (fwd)
>
>Hello All,
>
>Taken under advisement so far: use virgin UHDP 1.5" solid rod, 4' long to
>throw the charge, open and discharge connections. Opposite charges shall not
>be closer than 4" or more as possible. 1.5" to 2" copper pipe to join the
>center lugs of the capacitors and to provide a return connection. Sleeping
>on method of grounding capacitors together, perhaps 2 2" copper pipes
>flattened a mated with as many as possible attachment screws or 2 2" buss
>bars.

Aluminum bars might be a better choice.  Cheaper, easier to work with, etc.



>SPDT to be mounted on 5" ceramic standoffs attached to 5/8 G10 10X12
>base material. Discharge to be done by a series of 10" long ceramic 1.125"
>diameter Ceramic HV resistors capable of a complete discharge from 40KV.
>Activation via a 4" pneumatic plunger connection to 2" brass dowels.
>Remotely controlled from a 10' * xKJ Tygon tubing.
>
>Many Thanks,
>
>Jim Mora
>
>-----Original Message-----
>From: High Voltage list [mailto:hvlist@xxxxxxxxxx]
>Sent: Thursday, November 09, 2006 1:56 PM
>To: hvlist
>Subject: RE: The Geek Group High Voltage Capacitors, making a HV switch,
>(fwd)
>
>Original poster: Steven Roys <sroys@xxxxxxxxxx>
>
>
>
>---------- Forwarded message ----------
>Date: Wed, 08 Nov 2006 05:53:24 -0800
>From: Jim Lux <jimlux@xxxxxxxxxxxxx>
>To: High Voltage list <hvlist@xxxxxxxxxx>, hvlist <hvlist@xxxxxxxxxx>
>Subject: RE: The Geek Group High Voltage Capacitors, making a HV   switch,
>       (fwd)
>
>At 04:46 AM 11/8/2006, High Voltage list wrote:
> >Original poster: Steven Roys <sroys@xxxxxxxxxx>
> >
> >
> >
> >---------- Forwarded message ----------
> >Date: Wed, 8 Nov 2006 00:44:45 -0800
> >From: Jim Mora <jmora@xxxxxxxxxxx>
> >To: 'High Voltage list' <hvlist@xxxxxxxxxx>
> >Subject: RE: The Geek Group High Voltage Capacitors, making a HV  switch,
> >       (fwd)
> >
> >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.
>
>40 kV/inch is pretty bold.  Breakdown in a uniform field is 70
>kV/inch, and anything with curved components is hardly uniform.  Your
>40 kV/inch has a safety factor of less than 2.
>
>One rule of thumb might be an inch per 10 kV.  Watch the radius of
>curvature for corona losses.  At 20 kV, the *radius* needs to be on
>the order of 1/4"..  1/2" diameter
>
>Air insulated HV stuff tends to be quite bulky.