Patent ID: 7048875

Claim:
A dielectric fluid for an electrical device, said dielectric fluid comprising: at least 75% of a high oleic acid triglyceride composition comprising fatty acid components of at least 75% oleic acid; 0.1 to 3% antioxidant additives comprising: an alkylated diphenylamine; and one or more antioxidant compounds selected from the group consisting of butylated hydroxy toluene (BHT), butylated hydroxtanisole (BHA), mono-tertiary butyl hydraquinone (TBHQ) and combinations thereof; and wherein said triglyceride composition is further characterized by the properties of; a dielectric strength of at least 35 KV/100 mil gap, a dissipation factor of less than 0.05% at 25° C., acidity of less than 0.03 mg KOH/g, electrical conductivity of less than 1 pS/m at 25° C., a flash point of at least 250° C., and a pour point of at least −15° C.