Electrical insulating oil

Details Electrical insulating oil Electrical insulating oil

1975-03-03

1979-10-09

Levine, Herbert

Mineral oils: processes and products

Products and compositions

208 89, C10G 3900, H01B 322

Patent

active

041705432

ABSTRACT:
An electrical insulating oil having both high positive and high negative direct current breakdown voltage values is prepared by catalytically reforming a petroleum naphtha or similar feedstock and then fractionating or otherwise treating the reformed material to produce a highly aromatic oil which boils in the range between about 400.degree. and about 700.degree. 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 aromatic oil or blend may be hydrogen treated or contacted with an adsorbent to improve further its stability and other properties. Oxidation inhibitors, pour point depressants and other additives may be added if desired. 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.

REFERENCES:
patent: 2921011 (1960-01-01), Ordelt et al.
patent: 3006841 (1961-10-01), Haensel
patent: 3714021 (1973-01-01), Takahashi et al.
patent: 3839188 (1974-10-01), Mills et al.

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