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Subcommittee IV on Liquid Insulation of ASTM Committee D-9 always has been very active in the development of test methods and the evaluation of test results to be used as criteria of service-ability of new and used oils. In recent years, Subcommittee IV under the chairmanship of E. A. Snyder has sponsored a series of symposia concerning somewhat controversial discussions of the properties and performance of insulating liquids and the significance of various methods of test. Early in 1944, and prior to the first symposium of the current series, an extensive questionnaire was sent out to 92 of the larger utilities to establish just which tests were made by the different companies as criteria of serviceability for transformer oils in service. A comprehensive report on the questionnaire results was printed in ASTM Proceedings, Vol. 45, p. 302 (1945), and later published in the form of a reprint. The first symposium generally relating to the correlation of tests with the performance of insulating liquids was held in October, 1946, in Atlantic City. Four papers were the basis for a discussion of the possible significance of the Steam Emulsion Test, the Interfacial Tension Test, and analysis of Dielectric Strength Test data by statistical methods. Later, two other symposia were held in June, 1947, at Atlantic City, and March, 1949, at Washington, D. C, which included discussions of the merits of Oxidation Inhibitors in Transformer Oils, Power Factor Testing of Insulating Oils, Performance Characteristics of Askarels, Oil Testing and Maintenance Procedures used by one large utility, and the Results of Simulated Service Aging Tests on an Inhibited Oil. The first two symposia were published in ASTM No. 146, May, 1947, pages 90 to 100 and No. 149, December, 1947, pages 58 to 94. Both of these symposia also were printed in separate pamphlet form. The third symposium was printed as Special Technical Publication No. 95.
Schofield, L. B.
Materials Engineer, Commonwealth Edison Co., Chicago, Ill.