Patent ID: 8741186

Claim:
A method for forming a dielectric fluid, the dielectric fluid consisting essentially of a high purity vegetable oil, the method comprising: degumming, neutralizing, bleaching and deodorizing a vegetable oil to form a refined, neutralized and filtered vegetable oil; and subjecting the refined, neutralized and filtered vegetable oil to a second bleaching step to form a dielectric high purity vegetable oil, wherein the deodorizing step comprises distilling the vegetable oil with stripping steam to a maximum temperature of 265° C. for a maximum of 20 minutes such that the production of trans fatty acids does not affect the pouring temperature of the vegetable oil, wherein the high purity vegetable oil consists essentially of: from 17.7% to 28.5% by weight of a mono-unsaturated fatty acid; from 49.8% to 57.1% by weight of a di-unsaturated fatty acid; from 5.5% to 9.5% by weight of a tri-unsaturated fatty acid; and from 12.7% to 18.7% by weight of a saturated fatty acid.