Re: Blown Rolled "Hull" Capacitor Discussion
Subject: Re: Blown Rolled "Hull" Capacitor Discussion
From: jim.fosse-at-bdt-dot-com (jim fosse)
Date: Wed, 28 Feb 96 22:04 PST
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>After listening to this discussion, one thing has crossed my mind.
>Has everyone that has blown these caps used a vacuum pump to remove
>ALL air from between the plates and in the oil? Also, is everyone
>using transformer oil? I have heard talk of cleanliness, which is
>indeed important. But the two point I bring up are also critical.
>For those that have blown the rolled "Hull" capacitors recently, I
>would like to take a survey to see if the above 2 details were
>I have not built a rolled capacitor, only vertical stacked plate.
>I also had problems until I used tranformer oil and used a vacuum
>pump to remove all air.
I've used a vacuum pump to pull the air out, but before it stoped
outgassing, my top cover cracked. It was 1/8" plexiglass. I started out with
motor oil and then rinsed the cap twice with transformer oil, filled with
transformer oil and pulled a vacuum.
However, I'm only running 7.5KV at the moment while I'm waiting for my 30
mill polyethylene to arrive. When I've got my new cap built, I'll try my
single-layer of 60 mill polyethylene cap at 15KV and see if it blows!