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Electrical Insulation, IEEE Transactions on

Issue 4 • Date Dec. 1972

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Displaying Results 1 - 16 of 16
  • Table of contents

    Page(s): c1
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  • IEEE Electrical Insulation Group

    Page(s): c2
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  • Editorial

    Page(s): 161
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  • A Study of the Electrical Insulation Characteristics of Oil-Impregnated Polypropylene Paper

    Page(s): 162 - 169
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    The properties of polypropylene paper have been examined for possible use as an insulating material for power transmission cables carrying electric stresses excess of 500 kV. Typical physical and mechanical properties of dry and impregnated non-woven polypropylene are described. The effect of the composition of the impregnant on these properties was also investigated. Analyses of the results indicate that polypropylene webs could become a promising replacement for Kraft paper in cable insulation. View full abstract»

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  • Continuous Recording of Outdoor Insulator Surface Conductance

    Page(s): 169 - 175
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    Surface conductance of outdoor insulators exposed to pollution and moisture from rain or fog is related to two aspects of insulator application: 1) possibility of insulator flashover and 2) duration and severity of surface arc discharges. This paper will discuss some of the experience with monitoring the surface conductance of porcelain and synthetic insulation under voltage stress and exposed to outdoor weathering in various locations in the U. S. Simple flat surfaces mounted at a 30° angle from the horizontal and some shed-type insulators have been followed in this study. Recordings have been made over periods of several years, comparing results with low and high voltage stress. Results of these outdoor tests are also compared with results of tests of similar surfaces in a synthetic salt-fog chamber. View full abstract»

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  • Experimental Observation of Surface Charging of High-Voltage Insulators for Vacuum Apparatus

    Page(s): 176 - 179
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    The surface of cylindrical insulators placed in high vacuum becomes positively charged when subjected to a high-voltage stress parallel to the dielectric surface. A study is made of the variation of the surface charge density as a function of the voltage applied to insulators made of alumina ceramic, nylon, Teflon® and Plexiglas®. Direct and pulsed voltages were used in the experiments. View full abstract»

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  • The Flashover Voltage of Polymethylmethacrylate in Vacuum under Direct, Alternating, and Surge Voltages of Various Front Durations

    Page(s): 180 - 185
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    This paper presents results on flashover voltages across insulation surfaces and on the rate of surface deterioration in a vacuum of 10-5 torr under direct, alternating, and surge voltages of front duration in the range from 1-600 ¿s. The insulation material used was polymethylmethacrylate (PMMA) of cylindrical shape fitted between uniform field electrodes. The measurements were carried out on insulator specimens 25 mm in diameter and 5, 10, and 20 mm in length. View full abstract»

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  • The Effect of Oxidation on the Dielectric Properties of an Insulating Oil

    Page(s): 185 - 195
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    The dielectric constant and loss, as well as the resistivity of a cable insulating oil, have been measured as a function of temperature and frequency before and after successive oxidations. The dielectric loss, and its distribution of relaxation times changes slightly with the degree of oxidation, but the resistivity decreases by more than an order of magnitude. However, the activation energy for conduction remains unchanged. A previously unreported result is that the frequency of the maximum of the dielectric loss decreases with the degree of oxidation. A tentative semiquantitative molecular model to account for the activation energy for conduction is presented. View full abstract»

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  • Determination of the Permittivity and Loss Factor of Mixtures of Liquid Dielectrics

    Page(s): 195 - 199
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    A review of the available formulas for predicting the complex permittivity of mixtures of dielectrics has revealed some of their limitations. The authors pro-ose altemative formulas, which are straightforward and less time consuming. Measured values of e' and e", obtained from experiments conducted on mixtures of transformer oil, cottonseed oil, and castor oil in differcnt volumetric proportions, are in close agreement with their predicted values. View full abstract»

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  • Abstracts of Electrical Insulation in Japan

    Page(s): 200 - 206
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  • Contributors

    Page(s): 207 - 208
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  • Author index

    Page(s): 208a - 208b
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  • Subject index

    Page(s): 208b - 208c
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  • Membership application

    Page(s): 208-d
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  • Editorial policies and criteria

    Page(s): 208-e
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  • Information for authors

    Page(s): 208f
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Aims & Scope

This Transactions ceased production in 1993. The current retitled publication is  IEEE Transactions on Dielectrics and Electrical Insulation.

Full Aims & Scope