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The deleterious effects of corona on organic electrical insulation have been known for years, and considerable research and investigational work has been done by manufacturers and users of organic materials to evaluate their stability in applications where operating voltage gradients approach ionizing levels. Work in this field has been largely of an independent nature, each manufacturer and user of insulating materials approaching the problem from his own point of view. The result has been that no common or standard methods of corona detection and evaluation of the corona resistance of insulating materials have appeared in the literature. Recognizing the need for standardizing methods of corona detection and material evaluation the ASTM in 1954 organized Section L on Corona Tests under Subcommittee XII on Electrical Tests, D-9 on Electrical Insulating Materials for this purpose. This section immediately launched a program having the following tentative scope: 1. To devise test methods to determine the presence of voids in dielectrics which may be ionized under high voltage gradients; and 2. To devise test methods to differentiate relatively among electrical insulating materials with regard to their ability to resist the action of corona and its by-products. One of the first steps in starting this program was to organize a symposium on this subject, which was held in November 1955 during the ASTM D-9 meeting in Cincinnati, Ohio. The general purpose of this symposium was to give members of Section L an opportunity to present, in the form of technical papers, their present test methods and results, and to inform those interested in this subject of the complexities involved. The symposium was well attended and considerable informal discussion occurred.
Curdts, E. B.
Temporary Chairman, Section L, Corona Tests, Subcommittee XII, ASTM D-9, James G. Biddle Co., Philadelphia, Pa.