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Five years ago, the author presented to this Conference a paper entitled “A New Approach to the Analysis of Insulating Liquids”. In addition to presenting theories concerning the behavior of insulating oils, this paper described the Doble Oxidation Test which furnishes information during an accelerated life test that is indicative of the oil quality and its probable service performance by determining...
The intent of this paper is to point out the need for a careful analysis of some of the theories concerned with the life characteristics of liquid insulation of petroleum origin. Data pertaining directly to one type of liquid commonly known as transformer oil are used but the basic principles involved are not necessarily restricted to transformer oils.
The importance of several problems has been emphasized by advances recently made in the thinking and operating techniques concerned with the maintenance of insulating liquids such as transformer oil. These advances are the direct result of a program of directed research conducted by a large group of power systems cooperating through a clearing-house laboratory and the are based upon the new concept...
In industrial high frequency dielectric heating, heating cycles involving rates of temperature increase up to three hundred or four hundred degrees (F) per minute are common. It is important to know the values of the dielectric properties of the substance heated over the whole range of the heating cycle. Conventional methods of measurement, such as ASTM shunted susceptance, are not available as they...
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