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Electrical Insulation, IEEE Transactions on

Issue 2 • Date June 1974

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Displaying Results 1 - 12 of 12
  • Table of contents

    Publication Year: 1974 , Page(s): c1
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  • IEEE Electrical Insulation Group

    Publication Year: 1974 , Page(s): c2
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  • Electric-Field Distortions at Solid-Liquid Dielectric Interfaces

    Publication Year: 1974 , Page(s): 37 - 42
    Cited by:  Papers (9)
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    The Kerr electrooptic effect is used to study the static electric-field distortions produced by various solid dielectric materials when introduced between parallel plate electrodes in a chlorobiphenyl liquid insulating medium. The results show that for an Aroclor of commercial purity, the field distortions are independent of the electrical properties of the solid. A weak dependence on the liquid impurity levels is shown. The surface current densities are also independent of the spacer materials. It is suggested that the measured surface current density is due to electrohydrodynamic (EHD) circulation of the liquid near the spacer. The resulting field distortions are discussed in the light of EHD motion of the liquid at the solid-liquid interface. View full abstract»

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  • Kerr-effect Studies of an Insulating Liquid under Varied High-Voltage Conditions

    Publication Year: 1974 , Page(s): 43 - 56
    Cited by:  Papers (25)
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    Refined Kerr electrooptical fringe-pattern methods are used to study time and space variations in the electric field between the electrodes of parallel-plate capacitors filled with liquid nitrobenzene. Photographs of fringe-pattern data recorded during application of high direct (both positive and negative) and sinusoidal voltages, ranging in frequency from 40 to 200 Hz, are compiled to enable computation of space-charge distortions of the field in bulk of the liquid during the stress of high-field (up to 85-kV/ cm) operation. The measurements reveal significant differences between the field and charge behavior under short pulse (microsecond) voltage conditions, during prolonged dc operation, after sudden changes in the dc voltage level and polarity, and, for the first time, at various intervals over the course of entire cycles of sinusoidal voltage. The results show that space-charge distortion in the interelectrode field is influenced by the level, frequency, and duration of applied voltage. Discussions of effects believed due to particulate charge carriers, to electrohydrodynamic motion of the liquid, and to the electrode materials are also included. View full abstract»

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  • Electrical Conduction in Medium Viscosity Oil-Paper Films - Part I

    Publication Year: 1974 , Page(s): 57 - 63
    Cited by:  Papers (4)
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    The dielectric response of a pipe-type cable insulating oil film has been examined as a function of film thickness in the temperature range from 25 to 85°C at frequencies down to 10-2 Hz. Oil films, having thicknesses of 1-12 mil, were investigated. With films thicker than 6 mil, the dielectric behavior approached that of the oil in bulk form and the long-range charge-carrier migration process was characterized by activation energies lying between 0.72 and 0.85 eV. Reductions in oil-film thickness gave rise to spacecharge effects, which tended to decrease the apparent activation energy; values between 0.57 and 0.63 eV were found to be typical of a 2.5-mil film. The determined activation energies for dc conduction in the respective oil films showed in general a striking agreement with ac values. The involvement of hydrogen ions in the conduction process was suggested. View full abstract»

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  • Vacuum Insulation for Cryocables and Its Resistance to Discharges

    Publication Year: 1974 , Page(s): 63 - 68
    Cited by:  Papers (3)
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    A test length of a liquid-nitrogen-cooled vacuum-insulated coaxial cable for use in underground power transmission has been studied with respect to its high-voltage insulation properties. The critical element in the cable is the spacer between the conductors, since electrical discharges in the system are easily initiated across this spacer. Previous experiments with voltage sources capable of supplying low currents indicated insignificant discharge damage to the spacer as long as inorganic materials were used. The new results given in this paper show that insulator damage may still be small for discharges with peak current amplitudes up to 40 kA. The discharge current was supplied by an energy storage capacitor bank for a large number of tests with the same spacer. In addition to current measurements, photographic records of the discharges are presented, and an assessment of the damage to the insulator and conductors is given. View full abstract»

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  • Electrical Breakdown in a Cold Cathode Vacuum Diode

    Publication Year: 1974 , Page(s): 68 - 80
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    A 50-ns pulse generator is used to obtain time-correlated current-voltage relationships in the prebreakdown region for a long vacuum gap with cold planar electrodes. Analysis of data indicates several sequential stages occur. These stages include an initial quiet stage of voltage increase without interelectrode current, a microdischarge stage, a field emission stage, a space-charge controlled stage, and a final low-impedance stage where the current becomes sustaining. Electrical breakdown of the gap is considered in terms of a positive ion front moving from the anode. View full abstract»

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  • Contributors

    Publication Year: 1974 , Page(s): 81 - 82
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  • Membership application

    Publication Year: 1974 , Page(s): 82-a
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  • A look to your future IEEE Can help you stay current technically through Groups and Societies

    Publication Year: 1974 , Page(s): 82-b
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  • Editorial policies and criteria

    Publication Year: 1974 , Page(s): 82-c
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  • Information for authors

    Publication Year: 1974 , Page(s): 82d
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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