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Re: Blown Rolled "Hull" Capacitor Discussion


>Hello all interested in the blown "Hull" capacitors.
>
>After getting a few answers back on my previous "survey" of those that have
>blown these caps, a trend is evident.
> [snips]
>As I suspected, a vacuum was never pulled on those that have responded that
>have blown the caps.  If you are going to all the trouble to make them and
>have spent the money also, you should go to the trouble of using a vacuum
>pump to remove all of the entrained air from the oil and the air that is
>trapped between the plates. 

For those of you that don't have a vacuum pump, go find a water asperator.
It's commonly used to help remove water from a water bed. It will pull a
vacuum down to about 13 torr (memory working here).

>The second thing is the choice of oil.  Guys, transformer oil is only $25
>per 5 gallon pail.  It is readily available.  The 2 most important features
>of this oil (for our purposes) are its viscosity and its water content level.
>
It took me months to find it:) Just look in the phone book under OIL! find a
name brand oil distributor: Shell, Chevron, Citgo, Union 76.... (US brands,
tho some are international) call them up and ask for transformer oil. After
all this looking if found it 2 (that's right two) blocks from my house. They
only had 1 pallet full of 5 gallon pails, in a 1/2 block square wherehouse!
It was $21.95, I had checked the discount pharmacy, about $240 for the 2
gallons I needed!

[snip]

>Good luck,
>Scott Myers
>
>
                        jim