Re: Blown Rolled "Hull" Capacitor Discussion

>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.
>Scott Myers
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!