Published: Jan 1949
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Mineral oil has traditionally occupied a prominent place in the field of liquid insulants. It has been applied with success in numerous types of electrical apparatus covering a wide range of voltage ratings. It has served as a dielectric and coolant liquid in transformers and regulators, as the arc interrupting medium in switches and as the impregnant in electric cables and capacitors. Each of these applications presents its own requirements. About each have been developed laboratory methods of quality control. Running through all of its multitude of electrical applications, however, have been those problems associated with the oxidation of mineral oil. This oxidation in transformer use leads ultimately to sludge precipitation; the formation of which presents both a thermal and dielectric hazard. In cables and capacitors, oxidation of the oil results in increased dielectric loss and the possibility of dielectric failure from purely pyroelectric causes. The introduction of the askarel type of dielectric liquid eliminates these problems of oxidation which are inevitably associated with the use of mineral oil.
Clark, F. M.
Engineer, General Electric Co., SchenectadyN.Y.