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Registered Member #30
Joined: Fri Feb 03 2006, 10:52AM
Location: Glasgow, Scotland
Posts: 6706
The big advantage of vegetable oil is: if your transformer blows up, you can cook stuff in it!
Proud Mary raises some good points about the purity of food-grade oils. If it's good enough to eat on your salad, maybe it is good enough to insulate.
Patrick, wouldn't your college help you do a bit of research into oils as part of your project? Then you could write a paper and publish it here. Yellow olive oil vs. Cooper Envirotemp and so on.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Steve McConner wrote ...
Patrick, wouldn't your college help you do a bit of research into oils as part of your project? Then you could write a paper and publish it here. Yellow olive oil vs. Cooper Envirotemp and so on.
That would be great! This is very new and still emerging technology about which a great deal more has yet to be discovered before the global switch over to vegetable oil dielectric coolants. Arnie would give your project his personal stamp of approval (to the head) and overnight you'd become a geek celebrity living it up on cocktails of olive oil and purple drank.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
im just going to settle for envirotemp3 or canola oil , olive is too expensive. im trying to aquire 5 gallons. im only concerned with co$t, and dielectric strength.
Registered Member #15
Joined: Thu Feb 02 2006, 01:11PM
Location:
Posts: 3068
One thing you need to keep in mind is the dielectric of the oils. If you choose an oil with a high dielectric (castor oil for example has one of the highest dielectric constants of various oils), your parasitics can become very large. For a 60Hz transformer, this may not be an issue, but with a more specialized high frequency transformer, it could become an issue.
Just something else to consider when choosing your dielectric.
Registered Member #2431
Joined: Tue Oct 13 2009, 09:47PM
Location: Chico, CA. USA
Posts: 5639
yeah it will be at 50kHz so 1.7-3.3 for a dielectric constant is what i expect, so what ever my dry winding capacitences are, they will more than triple once vacuum-oil drawn. i will use Envirotemp FR3 fliud, the soy bean one is super good for dielectric strength, 57kv/mm, and 0.0005 for Dissipation factor. also, my max field intensity is designed to be 17kv/mm.
so,
Envirotemp = 57kv/mm breakdown, 3.2 dielectric C, 0.0005 for DF. Canola oil = 45kv/mm breakdown, 3.0 dielectric C, 0.0065 for DF. PVC plastic = 29kv/mm breakdown, 2.9 dielectric C, 0.1000 for DF. <- (DF, yikes!) mineral oil = 40kv/mm breakdown, 2.2 dielectric C, 0.0005 for DF.
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About Bio-Oils for HFHV Transformers.
