TSSP: List Archives

From: Bert Hickman
Date: Wed, 30 May 2001 07:17:00 -0500
Subject: Re: [TSSP] Topics on non-linear effects

Terry,

Please send me your mailing address off list. I've got a number of
references that should prove useful...

-- Bert --
-- 
Bert Hickman
Stoneridge Engineering
Email:    bert.hickman@aquila.net
Web Site: http://www.teslamania.com

"Terrell W. Fritz" wrote:
> 
> Hi Bert,
> 
> I have checked out the Ross Engineering VD120 and the Jennings Model 13200.
>  They seem to be the sort of things that would be good for this.  Probably
> a 1000:1 divider at 200kV peak would be nice.  I assume the new prices are
> enormous especially from Ross.  I think I have worn out my welcome with
> Jennings ;-))
> 
> It is probably not too hard to make an oil filled homemade version.  I have
> the precision Bertan that goes to 50kVDC that could simply arc to ground to
> make the voltage step for calibration.
> 
> http://hot-streamer.com/TeslaCoils/MMCInfo/GeekCaps/HVTest.jpg
> 
> I would be very interested in any design information or tips for such things.
> 
> Cheers,
> 
>         Terry
> 
> At 07:36 AM 5/29/2001 -0500, you wrote:
> >Terry,
> >
> >Ross Electronics and Jennings make similar units, using either compressed
> >gas (advantage: no X-Rays) or vacuum capacitors for the HV cap(s). Do you
> >have any idea of the expected standoff voltage required? I have a couple of
> >Ross units, one rated at 15 kV (off Ebay!) and the other for 60 kV
> >(untested - just picked it up at the Dayton HamFest, looks a bit beat up
> >though).
> >
> >It might be possible to make an air insulated HV capacitor, or use a chain
> >of vacuum caps with grading rings for the HV section. If you want to try
> >"rolling you own", I have some design information that might be useful. As
> >you indicate, the key would be in calibrating the thing. Assuming you could
> >prevent corona leakage, it may be possible to calibrate it by using a
> >precision HV DC supply (say 5 or 10 kV) and then "pulsing" the output to
> >the divider via a HV SPDT vacuum relay, driving the divider input to either
> >the supply voltage or ground.
> >
> >-- Bert --
> >--
> >Bert Hickman
> >Stoneridge Engineering
> >Email:    bert.hickman@aquila.net
> >Web Site: http://www.teslamania.com
> >
> >
> >"Terrell W. Fritz" wrote:
> >>
> >> Hi Paul,
> >>
> >> Capacitive voltage dividers may be the way to go.  Something along the
> >> lines of the $800 Pearson:
> >>
> >> http://www.pearsonelectronics.com/Pages/Capacitive_Voltage_Divider.html
> >>
> >> Unfortunatly, there were none on E-bay... ;-)
> >>
> >> They have the advantage of being calibrated out of the box (5%) and all the
> >> thinking is done.  They have 18pF of load.
> >>
> >> Most places seem to roll their own:
> >> http://www.uni-stuttgart.de/ieh/forschung/einrichtungen/v_general.jpg
> >> http://www.uni-stuttgart.de/ieh/forschung/einrichtungen/v_Teilentl1.jpg
> >>
> >> The problem is by the time you get all the electrostatic shields and
> >> terminals big enough not to arc, the load goes up too high.  However, they
> >> are basic physical devices with few tricks and the outputs can be clamped
> >> heavily and such for protection.  Calibration is not trivial either.  I'll
> >> think on it.
> >>
> >> The plane wave antenna is another possibility but it is a wide area device.
> >>  Perhaps it could be aimed through a tunnel or antenna like array to hit a
> >> small spot...
> >>
> >> I used to repair voltage dividers on 375kV power line equipment (live
> >> ==:-| ) but I don't think those types would be any good at high-frequency.
> >>
> >> Cheers,
> >>
> >>         Terry
> >>
> >> At 11:37 PM 5/28/2001 +0100, you wrote:
> >> >Terry, All,
> >> >
> >> >Some preliminary notes on your CW brush discharge current
> >> >measurements.
> >> >
> >> > http://www.abelian.demon.co.uk/tssp/tfcw260501/
> >> >
> >> >Next step would be to determine what the discharge impedance
> >> >is, and how it varies with the steady state voltage. But an
> >> >essential prerequisite is a means to reliably capture the
> >> >peak topvolts value.
> >> >
> >> >Without this, we can't establish a pattern for brush discharge
> >> >loadings, nor can we confirm ET6.12 predictions of breakout
> >> >voltage.  So now would be a real good time for budding inventors
> >> >out there to get cracking.
> >> >
> >> >Cheers All,
> >> >--
> >> >Paul Nicholson,
> >> >Manchester, UK.
> >> >--
> >


Maintainer Paul Nicholson, paul@abelian.demon.co.uk.