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Electrical Insulation, IEEE Transactions on

Issue 2 • Date April 1983

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Displaying Results 1 - 21 of 21
  • Table of contents

    Page(s): c1
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  • IEEE Electrical Insulation Society

    Page(s): c2
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  • Review Performance of HV Transmission Line Insulators in Desert Conditions Part I: Review of Research and Methods Adopted Internationally

    Page(s): 97 - 109
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  • Finite Element Solution of Monopolar Corona Equation

    Page(s): 110 - 119
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    In this paper, the monopolar corona equation is solved using a modified finite element method (FEM) to give the corona current caused by overhea dc transmission lines without using the commonly-used Deutsch's assumption The method is free from empiricism and entails implicitly a decrease of thsurface field intensity of the conductor with the applied voltage in the same manner as observed experimentally. This in itself represents an additional improvement for the analysis of ionized field where the approximation pertinent to the assumption of constant surface field intensity is mitigated. The calculated corona current as well as the current density at the ground plane agreed with those measured experimentally for a laboratory model. View full abstract»

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  • Effects of Electrode Materials on Tree Initiation in Polyethylene under Switching Surge Conditions

    Page(s): 120 - 124
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    This paper presents the results of the effects of electrode materials on tree initiation under switching surge conditions. Four kinds of electrode materials were used. Also, the effects of oxidized Al on the tree initiation was investigated. When a positive switching surge is applied to the needle in a point-to-plane test, little difference is found to exist among the four electrode materials with respect to the stress at the tip of the needle, Emax required to produce a tree. When a negative switching surge is applied, it is found that there are large differences of Emax. The value of Emax increases with the work function of the electrode materials. In addition with negative polarity, Emax increases with the rise time of the impulse wave in a manner which is related to the interaction of work function and space charge effects. It is noted that oxidized Al has a higher Emax than non-oxidized Al. When a positive half cycle wave follows a negative half cycle the value of Emax for the positive pulse is reduced from the value for a unipolar positive pulse by an amount which correlates with the work functio of the electrode. View full abstract»

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  • A Study of Emission Lines from Electrical Trees

    Page(s): 125 - 130
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    A study has been made of the gases appearing in the channels of bush and branch-like electrical trees propagating in low density polyethylene (LDPE) and cross-linked polyethylene (XLPE) subjected to a strong alternating electric field. The emission lines in the spectral range from 300 to 700 nm were observed with a monochromator and a vidicon tube followed by a multichannel analyzer. These lines, characteristic of the gaseous mixture created by the action of discharges on the channel walls, revealed then presence of CO, C02, and H2. The evolution of these lines was followed as a function of time. View full abstract»

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  • A New Flame Retardant 1,2-Polybutadiene Laminate

    Page(s): 131 - 137
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    A flame retardant 1,2-polybutadiene laminate with excellent dielectric properties and high heat resistance has been developed for high density multilayer printed wiring boards. A high molecular weight 1,2-polybutadiene is selected as a base material to provide prepregs with a bnon-tacky property without semi-curing of the resin. A low molecular weight 1,2-polybutadiene is used to control the resin flow property of prepregs. The desirable flame retardation is achieved while maintaining the excellent dielectric and thermal properties of 1,2-polybutadieney using a new halogenated bisphenol methacrylate compound. The 1,2-polybutadiene laminate exhibits a low dielectric constant (¿ = 3.4) and dissipation factor (tan¿=0.004) and a flammability classification of UL94 V-1. Also, it has a solder resistance at 300°C for over 120 s. The 1,2-polybutadiene multilayer printed wiring board shows no occurrence of resin smears and excellent transmission characteristics, and demonstrates high reliability of interconnectionn between plated-through-holes and internal layers against thermal shock. View full abstract»

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  • High Temperature Breakdown Characteristics in Polyethylene Film with Fixed Electrodes

    Page(s): 138 - 142
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    Electrical breakdown was investigated in films of low-density polyethylene by the application of both pulsed waveform and ramped voltages. Stainless-steel ball electrodes and the film to be measured were embedded in a thermoset resin. The breakdown strength FB increased with temperature T, ¿FB/¿T>0, between about 80°C and 100°C by application of impulse voltages. This temperature range corresponds to a region of heat absorption in DSC curves. We believe that the input energy rate from impulse voltage melts the crystalline lamellae and causes an increase of electrical breakdown strength. View full abstract»

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  • Interaction Mechanism between Conductor and Ground Insulation of Stator Windings

    Page(s): 143 - 151
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    In order to get fundamental knowledge in clarifying thermal stress induced in stator windings, the interaction mechanism between the conductor and ground insulation of stator windings under axial load were examined theoretically and experimentally. The stress analysis was carried out with the aid of an equivalent model in which the stator windings were regarded as a composite structure consisting of the conductor and ground insulation bonded to each other by the adhesive. A series of tests were carried out on six different kinds of test bars. The strain distribution on the insulation surface was measured by strain gauges under axial load. The electrical characteristics such as tan and breakdown voltage characteristics were also measured under axial load. The relationship between variations in the electrical characteristics and the occurrence of mechanical damages is discussed. The failure mechanism of the stator windings under axial load is also revealed. View full abstract»

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  • Decomposition Products of Silicone Liquid Due to Electric Discharge

    Page(s): 152 - 157
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    Silicone liquid can be used at relatively high temperatures, for instance as an impregnant in transformers for use in trains, because it has high thermal stability and low flammability. This paper describes decompositions of silicone liquid due to electrical discharges, such as arc discharge and partial discharge. It was found that hydrogen, carbon monoxide and cyclic dimethyl siloxane (D4) are produced due to electrical discharge as in the case of thermaln degradation. However, only one kind of dimethyl siloxane (D4) was found, whereas D3, D4, D5, and D6 were found in thermal degradation [2]. Moreover, the ratio of the gaseous products to cyclic dimethyl siloxane compounds for partial discharge is much smaller than the same ratio for arc discharge. In both cases the ratio is much larger than the ratio found for thermal degradation [2]. View full abstract»

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  • An International Research Project to Determine New Dimensioning Crules for Creepage Distances

    Page(s): 158 - 162
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    The paper reports on a research project with the goal of ascertaining the effects of environmental pollution on insulating materials, to simulate these effects in the laboratory, to determine the insulating properties of synthetic materials commonly used in electrical engineering and thus to provide creepage distances for the design of products in the 0 to 1000 V range. As the first phase of this project, test boards with a total of over 24000 test positions are being subjected to various environmental conditions in locations throughout Germany and in two locations in the United States. Surface tracking and interelectrode resistance will be monitored periodically throughout the aging period; the dust, which settles on the test units, will be analyzed at the conclusion of the tests. Comparative tests in an artificial industrial atmosphere are intended to simulate the field trials at an accelerated pace. View full abstract»

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  • Communication Numerical Computation of Potential Distribution along a Transmission Line Insulator Chain

    Page(s): 167 - 170
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    A combination of the integral equation method and the charge simulation technique has been used to compute the potential distribution along a HV transmission line insulator chain taking into account the influence of tower, crossarm, conductor, and ground. It is shown that the environmental influence is marked at the line end unit. The relative influence of crossarm and conductor on the potential distribution is discussed. It is shown that the crossarm has a greater influence on the potential distribution than the line conductors. View full abstract»

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  • Computer Programs for Calculating the Arrhenius Linear Regression Line and Related Statistics

    Page(s): 172 - 184
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    This paper presents computer programs for performing the statistical calculations in connection with accelerated life testing of electrical insulation. The equations for these calculations are given essentially in IEEE Standard 101. Not only is the equation for the linear regression line calculated but also the confidence limits for this line. The program is written in BASIC language in a form suitable for use with no or only slight modification on a variety of small computers such as the APPLE, TRS-80, PET and others. It is suitable for use by persons having no programming training and little experience with using a computer. The program prints out values on the regression line and its confidence bounds for five or more temperatures of interest and also statistical parameters for further comparison with other similar data. Two other programs are included for evaluating average and regression line differences. View full abstract»

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  • Standards and Algorithms

    Page(s): 185 - 187
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  • Meetings

    Page(s): 188
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  • Now is the Best Time to Join Our Society

    Page(s): 189-a
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  • IEEE Electrical Insulation Society

    Page(s): 189-b
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  • Information for authors

    Page(s): 189c
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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