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Re: LDPE oil tolerance?
Subject: Re: LDPE oil tolerance?
Date: Fri, 30 May 1997 22:02:20 -0700
From: Bert Hickman <bert.hickman-at-aquila-dot-com>
Organization: Stoneridge Engineering
To: Tesla List <tesla-at-pupman-dot-com>
References: 1
Tesla List wrote:
>
> Subject: LDPE oil tolerance?
> Date: Wed, 28 May 1997 07:27:50 -0400
> From: Steve Falco <sfalco-at-worldnet.att-dot-net>
> To: tesla-at-pupman-dot-com
>
> I recently repaired a dead neon by the usual freeze and chip techniques
> mentioned on this list. The short was between the side of one secondary
> winding and the steel core. I removed the mica/paper insulation, which
> was charred, and decided to embalm the unit in oil to provide new
> insulation.
>
> I placed the unit in a Rubbermaid container which is made of
> polypropylene (PP) with an LDPE cover. I then filled it with mineral
> oil. After a week or two, the PP was fine, but the LDPE cover had
> warped and swelled badly. I wound up discarding it.
>
> I guess I am concluding that PP is more oil-tolerant than LDPE, yet we
> prefer LDPE for oil-filled capacitors for its dielectric properties.
>
> My first question is: Any comments on long-term effects of oil on LDPE
> in capacitors?
>
> My second question is: Assuming I have my heart set on oil-filling my
> transformers, what would be a suitable container? (I'd also like to
> build a bigger capacitor, and was thinking of the Rubbermaid trash
> pails, but now I am afraid they will not hold up to the oil.)
>
> I suppose a metal box is a possibility, but that would be hard to
> fabricate. Anyone tried a plastic picnic cooler? Not sure what they
> are made of...
>
> Steve Falco
> Morris Plains, NJ
> sfalco-at-worldnet.att-dot-net
Hmm... Where'd you get the oil?? The Shell Diala-AX that I use CAME in a
5 gallon LDPE pail from my oil vendor!!
-- Bert --