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Re: Which oils..Capacitor oils
From: Alfred A. Skrocki[SMTP:alfred.skrocki-at-cybernetworking-dot-com]
Sent: Thursday, November 27, 1997 10:42 AM
To: Tesla List
Subject: Re: Which oils..Capacitor oils
On Thursday, November 27, 1997 2:07 AM Bert Hickman
[SMTP:bert.hickman-at-aquila-dot-com] wrote;
> Matt,
>
> Preferably go with either the Shell or Mobil Transformer Oils, since
> they have undergone refining steps which make them better suited for
> high voltage applications. For use a cap oil, an oxidation inhibitor is
> not necessary or desirable - use the uninhibited variety.
I have always found it interesting that the so-called transformer oils all
have poorer dielectric charasteristics than USP mineral oil!
> Now, while the oil companies won't recommend, or guarantee, that their USP
> (or equivalent) grade of mineral oil will work as a dielectric oil, in
> reality, it will. However, it MAY not be as "dry" as transformer oil,
> and thus may not have a high a breakdown voltage.
My experience has been that USP mineral oil always has a higher dielectric
strength than any transformer oils! If your concerned about water in the
mineral oil use a simple procedure that's used all the time in organic
chemistry labs, add some sodium sulfite anhydrous to the mineral oil and
stir it in well then let it set a couple of days so the hydrated sodium
sulfite can settle to the bottom then decant off the clear oil leaving
behind a small amount of oil with the hydrated sodium sulfite.
Sincerely
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Alfred A. Skrocki
Alfred.Skrocki-at-CyberNetworking-dot-com
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