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This summary of results on charge measurements made on dielectric surfaces is being written to cover the necessary requirements for an oral presentation, which has already been cleared in the form of a short abstract, at the Conference on Electrical Insulation in Pittsburgh, October 8, 1958.
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The purpose of this paper is to describe some recently developed techniques which have been found useful for dielectric measurements, primarily of liquids and gases.
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Tantalum has been sputtered onto glass microscope slides to form films of tantalum in the thickness range of from 4000 to 10000 Angstrom units. These films, whose surfaces are nearly optically flat, provide a very smooth material, which has had no mechanical or chamical polishing, on which anodically formed tantalum oxide may be investigated.
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In most direct current measurements no distinction is made between conduction current and absorption current. Actually, what is commonly called insulation resistance is calculated on the basis of total current which may be almost wholly absorption current.
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Presents the table of contents/splash page of the proceedings record.
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According to Time magazine, the dreadful summer of 1955 will be remembered for a long time to come in the Eastern United States. Beginning in July, the region was withered by drought and a heat wave, the worst on record, with temperatures in the 90's for a large part of the month. Then Hurricanes Connie and Diane flooded the Northeast, killing more than 250 people and causing property damage well...
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It is well known that electrical insulation may be damaged by corona generated when the system is subjected to extreme voltages. We investigated the effects of corona on conventional, high-pressure polyethylene as a part of our program of basic research on electrical insulation for possible use in high voltage cable.
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Ever since the discovery late in the last century of X-rays, radioactive decay of radium, etc., the effects of ionizing radiation on electrical discharges through air have been studied (1–9). However, these studies reveal very little information concerning the effects of the high-energy radiation of modern cobalt 60 sources, Van de Graaff generators, and nuclear reactors on the air within their radiation...
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Most of this presentation consisted of a motion picture of 21 tree-breakdowns between needle points about 1 mm. apart in strips of the following materials about l/8 inch thick: Three types of polyethylene Unvulcanized natural rubber Transparent polyvinyl chloride Polystyrene Unvulcanized Butyl Rubber Polyurethane The growing trees were photographed by transmitted light, so that the microchannels looked...
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Presents the introductory welcome message from the conference proceedings. May include the conference officers' congratulations to all involved with the conference event and publication of the proceedings record.
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Historically, power factor “tip up” or increase with voltage as a result of internal discharges has been a sort of qualitative indication of internal discharges and of an insulation quality. In European countries, the slope of the rising power factor voltage curve has been used in specifications of high voltage generator insulation. It is the purpose of this paper to emphasize the value of considering...
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Presents the front cover or splash screen of the proceedings record.
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When uniform-field, impulse electric strength measurements were made in different laboratories on liquids having ostensibly the same composition, the resulting values of electric strength often differed by as much as a factor of seven. To resolve this discrepancy, a study of the problem revealed that differences in the following experimental conditions might be responsible for the divergence of results:...
