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Old 18th May 2004, 03:24 PM   #1
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Default Oil in Paper in oil capacitor.

Does anyone know what oil is used in paper in oil capacitors ?
What about the electrode (foil) ............ aluminum ?
Thanks.
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Old 18th May 2004, 03:45 PM   #2
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Dehydrated and non oxidizing oil would be a very secure guess. Most of the oil producers refine a straight cut hydrocarbon-based oil specifically for electrical switchgear that meet this requirement.

Some ancient electronics had either vegetable or animal based insulating oils. Highly unlikely that anyone would be processing anything other than petroleum oils due to economy of scale.

The animal / vegatable oils tend to have a shorter life under adverse conditions than the equivalent petroleum product.

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Old 18th May 2004, 04:41 PM   #3
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Mineral oil, in general. Electrical grade. And I wouldn't be surprised if someone is using Fluorinert.
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Old 19th May 2004, 12:39 AM   #4
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Hi,

Quote:
And I wouldn't be surprised if someone is using Fluorinert.
Yep...
Said one cap to the other: Oil in oil it's not such a bad thing...

ASC, American Shizuki Company uses vegetal oil in their range of PIO caps.
Does anyone have any idea what exactly?

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Old 19th May 2004, 01:54 AM   #5
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I know that waaay back in time the oil from those crobs we see bloom in bright yellow (couldnt find the word in my dictionary) in the spring, you know the yellow fields, were used for caps. The danish word for them is "raps".

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Old 19th May 2004, 02:00 AM   #6
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"Rape" in English (an unfortunate cognomen). I wouldn't be confident about rapeseed oil for the long term.
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Old 19th May 2004, 02:05 AM   #7
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Hi,

Quote:
"Rape" in English (an unfortunate cognomen).
Raapzaad in Flemish...AKA colsaseed?

That's just ordinary kitchen oil, isn't it?

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Old 19th May 2004, 02:08 AM   #8
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Quote:
Originally posted by fdegrove
Hi,




That's just ordinary kitchen oil, isn't it?

Cheers,

I sure hope they refined it a bit before using it for caps, cause as I remember it, it absorbs water....but besides that...yes.


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Old 19th May 2004, 02:27 AM   #9
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Hi,

Quote:
it absorbs water....
Does that matter, provided they filled the caps before it had a chance to absorb moisture?

After all those cans are hermetically sealed, no?

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Old 19th May 2004, 03:32 AM   #10
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I meant that they had to get the water out of the oil prior to pouring it into the cap....once its in the cap and the cap is sealed, the problem should be minimized, but not eliminated.

Hermetical sealing is an ideal theoretical situation that rarely exists in real life. For some reason "near hermetical sealing" is called hermetical, but it sure isnt. Mostly there is plastic involved in the seal, and that cant be hermetical.....but this is naturally nitpicking of the definition.

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