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Registered Member #1062
Joined: Tue Oct 16 2007, 02:01AM
Location:
Posts: 1529
how thick? The easiest way and best way to make sure is to put a sample on a small piece for awhile, and possiably heat the oil to see if thats a problem.
It would be better to use a alu case, it would also help with the heat.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
There is such a wide range of oil and chemical resistance amongst resins that you would be best to consult the manufacturer's data sheets before making a decision.
See for example:
Investigation into the effect of transformer oil on polymers
FROST N. E. ; MCGRATH P. B. ; BURNS C. W. ;
Clarkson univ., ECE dep., Potsdam NY 13699, ETATS-UNIS
Abstract Several thermoplastics and an epoxy were exposed to a variety of conditions to determine the effect of chemical environment on the materials. Weight gain measurements of the samples were made after exposure to low humidity, ambient air, 90°C air, ambient transformer oil, and 90°C transformer oil. Two materials that performed well in these tests were polyetherimide (Ultem) and amine cured bisphenol-A epoxy. It was found that Noryl, a thermoplastic combination of high impact polystyrene and polyphenyleneoxide, was unsuitable for use in transformer oil, as it suffered substantial physical degradation. Polystyrene and high impact polystyrene (rubber modified polystyrene) performed poorly in both ambient and 90° transformer oil tests, with the rubber modified material exhibiting a much greater weight gain. Both high and low density polyethylene also showed large weight gains in hot transformer oil.
IEEE transactions on power delivery ISSN 0885-8977 CODEN ITPDE5
IEEE/Power Engineering Society PES. Summer meeting, Portland OR , ETATS-UNIS (23/07/1995) 1996, vol. 11, no1, pp. 331-334
Registered Member #1721
Joined: Sat Sept 27 2008, 08:44PM
Location:
Posts: 136
Hello:
Just FYI I can into several HV research sites, and one commercial one in Pakistan who sell VM power supplies up to 1,000,000 V at .5ma.
They package them in large commercial epoxy-fiberglass pipe, under oil. I know this pipe from past experience. So oil should be OK as long as you use epoxy resin, but a few phone calls to the manufacturers of this type of pipe may pay off in the form of cheap remnants etc, also a double ended bolt flange section would make a sweet container for a big oil, or SF6, filled HV power supply.
I have noticed recently that nobody wants to mess with SF6 gas, I plan to buy a 20# tank for my VM next year, maybe if there is enough interest we could split up a bigger tank as a group? SF6 is realy cool stuff 2-3 times the dielectric strength of air at normal pressure. Also to save gas 92% cheap CO2 with 8% SF6 is almost 2 times air.
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fiberglass for HV transformer case ?
