Electrical conduit containing hydrorefined oil

Abstract

Abstract An oil impregnated electrical conduit comprises a conductive metal, a cellulosic insulator, and a hydrorefined insulation oil, wherein the hydrorefined oil has a viscosity in the range of 10012,000 SUS at 100* F., contains 10-65 weight percent aromatics (by gel analysis) and less than 10 p.p.m. of basic nitrogen (preferably less than 5 p.p.m. and typically less than 2 p.p.m.). Typically, such an oil can contain more than 10 p.p.m. of total nitrogen (e.g., 15-600 p.p.m.) depending on the viscosity of the oil. Preferably, the hydrorefined oil is naphthenic or aromatic (by VGC classification). A preferred conduit is an oil-filled electrical cable wherein the cellulosic insulator is paper and is wrapped around the conductive metal. A preferred paper is capacitor grade Kraft paper of relatively high density and can be creped or microcreped. The cellulosic insulator can also comprise chemically treated cellulose such as cyanoethylated cellulose or acetylated cellulose.

Inventors

• 👤 Ivor W Mills
• 👤 Glenn R Dimeler
• 👤 John J Melchiore

Bibliographic Details