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Re: Halloween night, CP cap {con,de}struction
It's strange about Condenser Products. They have been friendly towards
the amateur coiler, but based on the results that I and others have had,
perhaps they should have done a bit more testing. What is your break rate
that you fire at? Do you use a rotary gap? How much did you pay for
yours? :-)
Chip
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Chip Atkinson
http://www.pupman-dot-com
--- If I can't fix it, I can fix it so it can't be fixed --
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On Mon, 2 Nov 1998, Tesla List wrote:
> Original Poster: "B**2" <bensonbd-at-erols-dot-com>
>
> Hi Chip,
> A well designed RF capacitor should take hot spotting into the design
> consideration. I am beginning to wonder about that company. My capacitors
> are 0.01 uF at 30 kV DC, BD300-103B, made by Plastic Capacitors Inc. I
> ordered these 20 years ago. I asked for polypropylene in oil with extended
> foil construction. The salesman suggested RF induction heater capacitors.
> He said that they run all day for an 8 hour shift at 300 kHz in induction
> heaters. I have never run them above 10 kV. In one run I ran for about
> 1/2 hour making 5 foot streamers until the 1/8 inch tungsten rods in the
> rotary burned down past the firing distance. The capacitors were cold as
> ice water. They are in a metal can with one insulated electrode coming
out.
>
> Barry
>
> -----Original Message-----
> From: Tesla List +ADw-tesla+AEA-pupman-dot-com+AD4-
> To: tesla+AEA-pupman-dot-com +ADw-tesla+AEA-pupman-dot-com+AD4-
> Date: Sunday, November 01, 1998 7:51 PM
> Subject: Re: Halloween night, CP cap +AHs-con,de+AH0-struction
>
>
> Original Poster: Chip Atkinson +ADw-chip+AEA-pupman-dot-com+AD4-
>
> Barry,
>
> The safety gap is set at about 1/2+ACI-, 1/32+ACI-. I had the voltage
turned
> up just to where it wasn't firing at all, probably around 11KV.
>
> Personally I suspect that the problem was due to +ACI-hot spots+ACI-
> developing in
> the caps. Once the cap shorts out, it's all over because there is very
> little room for expansion of the contents.
>
> Chip
>
>
> On Sun, 1 Nov 1998, Tesla List wrote:
>
> +AD4- Original Poster: +ACI-B+ACoAKg-2+ACI-
+ADw-bensonbd+AEA-erols-dot-com+AD4-
> +AD4-
> +AD4- Hi Chip,
> +AD4- Sorry to hear about the demise of your capacitors. Did the
> safety gap
> +AD4- across the capacitors ever fire during any of these runs?
> +AD4-
> +AD4- Barry
> +AD4-
> +AD4- -----Original Message-----
> +AD4- From: Tesla List +ADw-tesla+AEA-pupman-dot-com+AD4-
> +AD4- To: tesla+AEA-pupman-dot-com +ADw-tesla+AEA-pupman-dot-com+AD4-
> +AD4- Date: Sunday, November 01, 1998 1:29 AM
> +AD4- Subject: Halloween night, CP cap +AHs-con,de+AH0-struction
> +ADw-SNIP+AD4-
>
>
>
>