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Electrical Insulation, IEEE Transactions on

Issue 5 • Date Oct. 1983

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Displaying Results 1 - 21 of 21
  • Table of contents

    Publication Year: 1983 , Page(s): c1
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  • IEEE Electrical Insulation Society

    Publication Year: 1983 , Page(s): c2
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  • From before the EIC an Interview with Walter Hugger

    Publication Year: 1983 , Page(s): 469 - 476
    Cited by:  Papers (1)
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  • Electric Field and Potential Distributions for Unequal Spheres Using Symmetric and Asymmetric Applied Voltages

    Publication Year: 1983 , Page(s): 477 - 484
    Cited by:  Papers (5)
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    The electrostatic field and the potential distributions between a pair of spherical electrodes having unequal diameters are calculated using the charge simulation method when symmetric (+ V/2 and -V/2) and asymmetric (V and 0) voltages are applied across the gap. The variation of the electric field and the potential along the shortest distance between the spheres are studied over a wide range of sphere diameters (ratio 0. 1 to 50) and a range of gap separation to sphere radius (ratio 0.05 to 100). The present results are compared with those previously determined in a restricted range of diameter ratios, using a finite difference method for solving the Laplace equation. Good agreement is obtained. View full abstract»

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  • The Layered Capacitor Method for Dielectric Bridge Measurements. Data Analysis and Interpretation of Fluoride Doped ICE.

    Publication Year: 1983 , Page(s): 485 - 497
    Cited by:  Papers (1)
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    Dielectric relaxation in ice is due to dipole reorientation and ionic diffusion. Close-coupling complicates the interpretation, especially in samples doped with proton-supplying impurities. We report on a bridge technique using ice samples sandwiched between layers of polytetrafluoroethylene (Teflon®) . An equivalent-circuit model and a nonlinear fitting algorithm have been developed for analysis of the data. A small number of discrete relaxation ranges is assumed, each characterized by a single relaxation time. Linear volume parameters can be derived from these measurements provided that the blocking layer capacitance is small compared to the series, space-charge polarization capacitance. Nonlinear conductance effects were negligible. Next, the data are used to explore the ability of the method to resolve multiple spectra. In principle, the inversion does not yield unique spectral parameters for multiple spectra. Moreover, it was found that the equivalent-circuit model has a built-in source of non-uniqueness which amplifies fitting uncertainties when ice volume parameters are ederived from ¿effective¿ parameters of the layered capacitor. This shortcoming should be capable of improvement by further work. In conclusion, the use of linear blocking layers allowed a semiquantitative interpretation even in cases where strong overlap of relaxation processes was encountered. View full abstract»

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  • Dielectric Surface Discharges: Effectsof Combined Low-Energy and High-Energy Incident Electrons

    Publication Year: 1983 , Page(s): 498 - 503
    Cited by:  Papers (4)  |  Patents (1)
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    In simulation of the exposure of spacecraft insulating materials to the energetic-electron environment of synchronous orbit, a study has been made of the effect on dielectric surface discharges of adding high energy electrons at 5 pA/cm2 to a primary 20 keV, 10 nA/cm2 electron beam, the high-energy broad spectrum particles having been produced by the ß-decay of Strontium-90. Kapton exhibits the most surprising effects, which are significantly increased discharge strength, increased waiting time between discharges, and a decreased number of discharges per specimen before discharge cessation. Mylar exhibits similar but less pronounced effects, while Teflon is relatively unaffected. There is evidence that with Kapton and Mylar the high energy electrons act in some way to delay the instant of discharge ignition so that more charge can be accumulated during chargeup and hence released during arc discharge. View full abstract»

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  • Surface Discharge Effects on Dielectric Properties of Epoxy Resins

    Publication Year: 1983 , Page(s): 504 - 512
    Cited by:  Papers (1)
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    The effects of surface discharges on dielectric properties of filled and unfilled epoxy resins have been studied. By means of parallel-plate electrodes, sheet samples have been aged through direct and indirect exposure to electric discharges at 15 kV ac 50 Hz voltage in static dry air for time intervals up to 300 hours. The samples have been examined with regard to changes in weight and dielectric strength; then permittivity and loss tangent measurements have been performed at several frequencies as functions of temperature. A good agreement between the behavior of dielectric properties and of dilelectric strength has been found for the materials examined, provided the strength is measured on samples from which the damaged surface has been removed by peeling the samples to a depth of about 0.5 mm. View full abstract»

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  • Arc Discharge on Insulation Surfaces a General Approach UP to the Ablation Stage

    Publication Year: 1983 , Page(s): 513 - 519
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    Various kinds of arcing on insulation surfaces are analyzed using a general approach derived from heat transfer theory. Two extreme cases of (1) small current, long-time arcing, and (2) highcurrent, short-time arcing appear to be most important. A simplified equation for estimating the depth of arcing damage is derived. For a one-side open arc the power flow into the insulation body is estimated to be on the order 107 W/m2. View full abstract»

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  • Acoustic Emission Distributions and Types of Electrical Trees in Polyester Resin

    Publication Year: 1983 , Page(s): 520 - 527
    Cited by:  Papers (6)
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    Acoustic emission (AE) characteristics have been investigated during electrical tree growth from a needle tip in a plastic insulating material. Alternating voltages (50 Hz) of 16, 20, and 24 kV rms were applied. Various patterns of tree growth, branch-like, bush-like, and filamentary trees, and formation of voids were observed. The amplitude of AE from the branch-like and filamentary trees was relatively small, and the amplitude distribution exhibited a sharp peak at small amplitude. On the other hand, the amplitude of AE from the bush-like tree and at void formation was large, and the amplitude distribution covered a wide range. The number and the amplitude of AE events were studied in relation to the phase of alternating voltage. The largest number of events was observed at the peak of the applied voltage for the branch-like and filamentary trees, and before the voltage peak for the bush-like trees. Most AE signals were detected when the absolute value of the voltage increased for the branch-like, bush-like, and filamentary trees but were detected in all voltage phases when voids formed. During tree activity, the AE amplitude was tended to be largest at the voltage peaks, but during void formation, was largest just after the change of voltage polarity. View full abstract»

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  • Corona Discharge Studies in SF6 with Insulators under Positive Switching Impulses

    Publication Year: 1983 , Page(s): 528 - 535
    Cited by:  Papers (4)
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    Corona discharge currents and corona inception time delays have been measured in SF6 with an insulating support under positive switching impulses. The insulator surface charging is found to have a significant influence on the corona discharge phenomena. Cumulative probability distribution function of the number of corona pulses is found to depend upon the insulator material and gas pressure. Based on the experimental results, the calculated corona inception time delay distribution with an insulator is found to fit into a log-normal distribution. The influence of insulator on electron initiating mechanism is analyzed using Von Laue diagrams for the corona time delay. The effect of gas pressure and the applied voltage on the inception time delay and pulse current with an insulator in the gap is discussed. View full abstract»

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  • Insulation Effects of Hydrogen Gas for Cooling Turbine-Driven Generators

    Publication Year: 1983 , Page(s): 536 - 540
    Cited by:  Papers (1)
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    Endurance against surface discharge of epoxy resin and epoxy resin-impregnated mica composites were examined. Voltage endurance properties of epoxy micaceous insulation with open (ventilated) voids and closed voids were examined. Effects of compressed hydrogen gas on creeping discharge suppression were also examined in a high voltage rotating machine winding. Furthermore, thermogravimetric analysis (TGA) was done on epoxy micaceous insulation and wire enamel in an atmosphere of hydrogen, nitrogen, and air. From these test results, advantageous effects of compressed hydrogen gas for cooling turbine-driven generators were clarified. View full abstract»

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  • Properties of Castor Oil Impregnated All-Polypropylene and Polypropylene-Paper Capacitors

    Publication Year: 1983 , Page(s): 541 - 550
    Cited by:  Papers (3)
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    In view of its non-toxicity, and good dielectric properties, castor oil, a polar liquid dielectric of vegetable origin is suggested as a possible alternative to PCB's for capacitor applications. In this paper the dielectric properties (including partial discharge behavior), of all-polypropylene and paper-polypropylene capacitors with castor oil as impregnant, are reported. The paper also contains results of life studies conducted under accelerated electrical and thermal stresses when they are occurring both individually and combined. The data obtained have been statistically analyzed and approximate life of the system calculated by linear extrapolation. View full abstract»

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  • On the Toxicity of Sparked SF6

    Publication Year: 1983 , Page(s): 551 - 552
    Cited by:  Papers (5)
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  • New Voltage-Endurance Curves for Combined Thermal and Electrical Aging of Coil Insulation

    Publication Year: 1983 , Page(s): 553 - 555
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  • Dyeing Termiinology

    Publication Year: 1983 , Page(s): 556 - 557
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  • Meetings

    Publication Year: 1983 , Page(s): 558
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  • Papers Presented at the 1st International Conference on Conduction and Breakdown in Solid Dielectrics, 4-8 July 1983, Toulouse France

    Publication Year: 1983 , Page(s): 559 - 561
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  • Electrical Insulation History, the Centennial, and Meetings

    Publication Year: 1983 , Page(s): 562
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  • Now is the Best Time to Join our Society.

    Publication Year: 1983 , Page(s): 562-a
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  • IEEE Electrical Insulation Society

    Publication Year: 1983 , Page(s): 562-b
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  • Information for authors

    Publication Year: 1983 , Page(s): 562c
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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