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IEEE Transactions on Electrical Insulation

Issue 6 • Date Dec. 1987

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Displaying Results 1 - 25 of 29
  • IEEE Transactions on Dielectrics and Electrical Insulation - Table of contents

    Publication Year: 1987, Page(s): c1
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  • IEEE Dielectrics and Electrical Insulation Society

    Publication Year: 1987, Page(s): c2
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  • The Impact of Pulse Enereization on Electrostatic Precipitation Peformance

    Publication Year: 1987, Page(s):657 - 675
    Cited by:  Papers (6)
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  • Thermodynamics of Water Treeing

    Publication Year: 1987, Page(s):677 - 681
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (635 KB)

    We demonstrate that the electrostatic stress in model structures representative for water trees can never reach the yield stress of polyethylene. We propose a model in which space charge flow across water-polymer interfaces causes electrochemical reactions such as partial oxydation. The morphology of the water tree is determined by microphase phase separation of the partially oxydized material. View full abstract»

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  • On the Return-Voltage Buildup in Insulating Materials

    Publication Year: 1987, Page(s):683 - 690
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1046 KB)

    Charged capacitors which have been temporarily short-circuited display a "return voltage" buildup which may cause severe shocks. This old phenomenon has been reinvestigated on various materials (polyethylene, polyester, Kapton®, etc.) poled by different techniques (HV, corona, plasma, etc.) after different poling times. Return voltage buildup is observed on all insulating (polar and non polar) ma... View full abstract»

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  • Limit-Field Behavior of Various Gas Mixtures Discussed in the Framework of a Boltzmann-Equation Analysis

    Publication Year: 1987, Page(s):691 - 698
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1195 KB)

    Theoretical limit fields for SF6/N2, CC12F2/N2, CC12F2/SF6 and CC12F2/SF6/N2 gas mixtures obtained from a Boltzmann-equation analysis are compared with experimental values measured in a steady-state discharge, and with data from other swarm experiments as well as with breakdown-potential measurements taken from the literature. Good agreement is found between experimental and calculated limit-field... View full abstract»

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  • Chemical Changes Created by High Energy Ions in Polyethylene

    Publication Year: 1987, Page(s):699 - 708
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2344 KB)

    Argon and oxygen ions were accelerated with energies of 50 to 150 keV and rastered across high density polyethylene. The free radicals formed in the ion-implanted polyethylene were studied using an electron spin resonance spectrometer. The free radicals formed were stable in air and even survived solvent separation of the undamaged polymer from the ion damaged polymer. Chemical characterizations i... View full abstract»

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  • Nucleation of Electrical Tress in Polyethylene

    Publication Year: 1987, Page(s):709 - 714
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (796 KB)

    The inception voltage Vi for 1 pC partial discharges has been measured for vacuum molded needle-plane samples of low density polyethylene. The principal parameters studied are needle radius R (3¿R¿100 ¿m), ambient gas (air, N2, Ar, SF6), and frequency of the applied ac Voltage (60 Hz, 1 kHz). Experimental results during this "nucleation phase" indicate that electrons, field-emitted from the nee... View full abstract»

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  • Degradation of Dielectric Properties of Polyethylene by Combined Y-Irradiation and Thermal Stresses

    Publication Year: 1987, Page(s):715 - 720
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (798 KB)

    Degradation of dielectric properties polyethylene under the combined environment of ¿-irradiation and thermal aging has been studied. To exclude the effect of additive agents and to minimize the effect of the process limited by diffusion of oxygen on the degradation, a 25 ¿m thick low-density polyethylene ene film free from additives has been used. Dielecc re relaxation is used as a tool to stud... View full abstract»

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  • Breakdown of Polyethylene Film-Liquid Nitrogen Composite Systems

    Publication Year: 1987, Page(s):721 - 727
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1385 KB)

    This paper reports on the breakdown characteristics of lowdensity polyethylene film-liquid nitrogen composite systems. The breakdown characteristics depend on the number of film layers in the sample, the electric field distribution inside the film, and the front time and polarity of the applied impulse voltage. Three effects are discussed. (1) The effect of field distribution: a strong field at th... View full abstract»

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  • Aging of Polyethylene for Cable Insulation

    Publication Year: 1987, Page(s):729 - 734
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (925 KB)

    Experimental investigations have been carried out on specimens mens of polyethylene sheets and foil. Polyethylene was subjected to different types of aging which produced a variety of internal degenerative effects. Subsequently, various electrical properties of aged and unaged specimens were measured. Associated structural changes in the polyethylene were determined by means of infrared spectropho... View full abstract»

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  • Thermal-Aging Behavior of Bo-Pp Films

    Publication Year: 1987, Page(s):735 - 743
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1283 KB)

    The variation in electrical properties and morphology of biaxially-oriented polypropylene (BO-PP) films with thermal aging is discussed, using two kinds of BO-PP films. It was found that the thermal aging behavior of those two types of films depends on their initial morphology. The thermal aging gives rise to an increase in the degree of cyrstallinity due to crystallization of a part of the amorph... View full abstract»

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  • A Method to Estimate the Lifetime of Solid Electrical Insulation

    Publication Year: 1987, Page(s):745 - 753
    Cited by:  Papers (42)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1233 KB)

    This paper describes a new statistical method of lifetime estimation of a solid electrical insulation using data from an accelerated aging test. The method simultaneously uses the maximum likelihood estimation and the Newton-Raphson methods. The novel aspect of this work is the introduction of a new threshold term in addition to well-known estimation techniques based on the inverse power model com... View full abstract»

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  • Volt-Time Curves for a Coaxial Cylindrical Gap in SF6-N2 Mixtures

    Publication Year: 1987, Page(s):755 - 762
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (991 KB)

    The impulse breakdown voltage-time characteristics of a coaxial cylindrical gap in 10% SF6-90% N2 mixtures are presented. The theoretical models for the determination of the envelopes of the v-t characteristics are examined. A method has been suggested for the determination of the characteristic parameters used in the theoretical models. View full abstract»

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  • Improved Dielectric Strength of SF6 Gas with a Trichlorotrifluoroethane Vapor Additive

    Publication Year: 1987, Page(s):763 - 768
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (818 KB)

    This paper presents a new approach to improvement in the dielectric strength of SF6 gas insulation. Experiments show that the addition of a small amount of trichlorotriflouroethane (R113) vapor cannot only increase the breakdown voltages within the corona stabilization region, but also improve corona onset voltages of SF6 in highly nonuniform field gaps. This additive is found superior to those us... View full abstract»

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  • Contribution on the Specification of an Aging Test for the Insulation of Enclosed, Air-Insulated Switchgear

    Publication Year: 1987, Page(s):769 - 774
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1093 KB)

    Because of high humidity and condensation, layers of moisture are formed on the surface of insulating materials in indoor switchgear installations which, as a result of contamination, are conductive electrolytic boundary layers. When this happens, electrochemical interactions can produce aging of the insulating material surfaces that may even lead to failure of the insulation. Basic investigations... View full abstract»

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  • Positive Corona in Point-Plane Gaps as Influenced by Wind

    Publication Year: 1987, Page(s):775 - 786
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1586 KB)

    In this paper, the effect of wind on positive corona behavior up to breakdown is studied for point-plane gaps when the wind is flowing axially (against or parallel to the direction of ion convection from the point to the plane). The repetition rate of streamer pulses and its randomness as influenced by wind has been determined for different applied voltages. The spatial distribution of the current... View full abstract»

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  • Discharge Inception Voltages Due to Voids in Power Cables

    Publication Year: 1987, Page(s):787 - 793
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (949 KB)

    Expressions are derived for the inception voltage at which discharges occur in gaseous voids entrained within the insulation of single and three-core, screened as well as belted, power cables. The inception voltage Vi depends upon the conductor diameter, the insulation thickness, the dielectric permittivity, the location, shape and length L of the void as well as the pressure P of the gas inside t... View full abstract»

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  • Degradation of Insulating Materials of Transformers

    Publication Year: 1987, Page(s):795 - 800
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (760 KB)

    Insulating papers and pressboards must have high dielectric strength and high tensile strength. However, these materials are gradually degraded due to thermal stress, oxygen, and moisture. Because the tensile strength decreases owing to degradation, the degradation of insulating material may affect the life of transformers. In our laboratory, through accelerated tests using models of oil-impregnat... View full abstract»

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  • Novel Insulator Designs for Superior DC Hold-Off in Bridged Vacuum Gaps

    Publication Year: 1987, Page(s):801 - 810
    Cited by:  Papers (13)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1851 KB)

    The dielectric strength of insulator-bridged vacuum gaps has been investigated under dc stresses. Contrary to many previous investigations, careful study undertaken here reveals that negative-angled conical frustrums withstand high er conditioned withstand voltages than positive frustrums and cylindrical insulators. The superior voltage perform ance of negative-angled conical frustrums over positi... View full abstract»

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  • Relationship between Photo-Emission and Propagation Velocity of Local Discharge on Electrolytic Surfaces

    Publication Year: 1987, Page(s):811 - 817
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (954 KB)

    This paper presents experimental studies of local discharge propagation along an electrolytic surface under the application of impulse voltage. Experiments were performed using a water channel with point/plane electrodes. The resistivity of the electrolyte (aqueous solution of potassium chloride) was varied from 350 to 3000 ¿cm. Local discharges propagate on the electrolytic surface and emit ligh... View full abstract»

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  • Discharge Onset Voltage Prediction for a Gas-Insulated System Via the Figure-of-Merit Concept

    Publication Year: 1987, Page(s):819 - 823
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (697 KB)

    The accuracy of discharge onset prediction via thefigur figure-of-merit concept for a strongly electronegative gas is examined. A coaxial system is employed, for which the inner electrode possesses a surface roughness of Ra=35 ¿m. With SF6 as the insulating medium a reference discharge-onset characteristic is obtained for gas pressures up to 0.8 MPa. From a knowledge of this onset characteristic... View full abstract»

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  • Stastical Variation of DC Corona Pulse Amplitudes in Point-to-Plane Air Gaps

    Publication Year: 1987, Page(s):825 - 829
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (482 KB)

    Using a multichannel analyzer, statistical variations of corona pulse amplitudes are studied for positive and negative dc corona in point-to-plane air gaps. It is shown that,en generally, pulse amplitudes follow a Gaussian type of probability distribution. Exceptions to this be havior are observed near the corona onset level, near the pulse-to-glow transition level, or in less nonuniform field gap... View full abstract»

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  • Meetings

    Publication Year: 1987, Page(s): 830
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  • A New Approach to Measurement of the Figure-of-Merit for Strongly Electronegative Gases and Gas Mixtures

    Publication Year: 1987, Page(s):831 - 834
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (474 KB)

    This communication presents a new approach to measurement of the figure-of-merit for strongly electronegative gases and gas mixtures. Compared with Pedersen's method, which needs very high precision measurements, the present method can be used in most laboratories. The difference between our results and those obtained by Pedersen et al. is not more than 3%, which is acceptable for engineering appl... View full abstract»

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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