Electrical insulating oil

Details Electrical insulating oil Electrical insulating oil

C - Chemistry, Metallurgy

10

G

31/102

C10G 35/04 (2006.01) C10M 101/02 (2006.01) H01B 3/22 (2006.01)

Patent

CA 1063793

ABSTRACT OF THE DISCLOSURE An electrical insulating oil having both high positive and high negative direct current breakdown voltage values, which can be obtained by catalytically reforming a petroleum naphtha or similar feedstock comprises a highly aromatic oil which boils in the range between about 400° and about 700°F., contains less than about 1.0 weight percent of polar compounds, and includes less than about 2.5 weight percent of aromatic compounds having four or more condensed aromatic rings per molecule. This aromatic oil may be blended with up to about 75 volume percent, based on the total blend, of a low aromatic petroleum fraction which has been hydrogen treated, solvent extracted or acid treated to reduce its aromatics content to a level less than about 20% by weight. The product oil has surprisingly high breakdown strength values for both positive and negative impulse waves, low or negative gas emission values and better free-convection heat transfer properties than oils available in the past.

245868

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