Re: Capacitor check (fwd)
---------- Forwarded message ----------
Date: Fri, 24 Apr 1998 14:40:15 MYT
From: Sulaiman Abdullah <sulabd-at-hotmail-dot-com>
Subject: Re: Capacitor check (fwd)
Viv, by "dry" do you literally mean dry as in no oil etc. ?
>>I designed the capacitor (PE and Aluminium) to have 1" space to
>>the 'edges' and 2" to the 'ends'.
>>I certainly expect 30 kV peak, and I'd value all your opinions
>>as to whether this is enough allowance, and would you care to
>>'guestimate' what clearance would produce a RELIABLE capacitor
>>for 50 kV peak. Assume I'll clean all parts fairly well and
>>vacuum out most air-bubbles.
> I built my flat-plate capacitor with Polystyrene Sheets 24" * 16".
>I originally had, as you have described, 1" space to the 'edges' and
>2" to the 'ends'. I ran the TC with a 10Kv 50ma xfmer. After a few
>the capacitor broke down by tracking at the ends. I was able to
>the capacitor because I made it dry (no glue).
>An original prototype I made with varnish sticking the Aluminium and
>sheets together had too many bubbles so I scrapped it before even using
>Using new plastic with the protective cover just being removed and
>conditions actually produced the capacitance with about two thirds the
>of plates of the glued variety.
>I now have 2" space on the edges and 4" at the ends. I had obviously
>more plates to achieve original capacitance of 0.015uf as the area was
>No problems since.
>Viv Watts UK.
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