Patent ID: 6280659
Filing Date: 2001-08-28
Classification: H01B

Abstract:
A method for manufacturing a vegetable seed oil based electrical insulating fluid comprising the steps of:providing a vegetable seed oil or blend of vegetable seed oils containing oleic acid and consisting essentially of a vegetable seed oil or a blend of vegetable seed oils having an iodine number of less than or equal to 86;heating the vegetable seed oil or blend of vegetable seed oils to a temperature of between about 80.degree. C. to about 100.degree. C.;purifying the heated vegetable seed oil or blend of vegetable seed oils to remove substantially all polar contaminants, free fatty acids, and particulate materials therefrom to produce a purified vegetable seed oil, wherein the step of purifying the oil comprises mixing the oil with a blend of activated clay and activated alumina, and thereafter separating the oil from the blend of clay and alumina by passing the oil through a filter;degassifying the purified vegetable seed oil or blend of vegetable seed oils to remove moisture and gases therefrom, said degassifying step reduces the moisture content of said oil to less than or equal to 200 ppm; andstabilizing the vegetable seed oil or blend of vegetable seed oils to inhibit oxidation thereof, wherein the step of stabilizing includes mixing an oxidation inhibitor with said oil.