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Re: Blown Rolled "Hull" Capacitor Discussion


>>From jim.fosse-at-bdt-dot-com Mon Mar 25 01:13 MST 1996
>>Received: from bdt.bdt-dot-com (root-at-bdt-dot-com [140.174.173.10]) by uucp-1.csn-dot-net (8.6.12/8.6.12) with SMTP id VAA21492 for <tesla-at-grendel.objinc-dot-com>; Sun, 24 Mar 1996 21:22:31 -0700
>From: jim.fosse-at-bdt-dot-com (Jim Fosse)
>To: tesla-at-grendel.objinc-dot-com
>Subject: Re: Blown Rolled "Hull" Capacitor Discussion
>Date: Mon, 25 Mar 1996 04:22:09 GMT
>
I said:
>I just blew my second cap:(
>
[snip]
>Nope! a 1/16" hole clean (actually very black, melted the layers 
>together)  through the 3 layers of 0.030" polyethylene. The hole is 
>about 1.25" from the bottom edge of the plastic and about 2' from the 
>inside center of the roll.
>
I just took apart my first blown cap. 1 layer of 0.060" polyethylene.
Identical failure!  Both look as if a sharp point on the edge of one
of the plates punched thru the dielectric. Both holes were 1.5' to 2'
in from the inside of the roll.

I had sanded and smoothed both cap's plates and used my fingers as
roughness gages.

	2 sizzle jim