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IEEE Transactions on Electrical Insulation

Issue 3 • Date June 1985

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Displaying Results 1 - 25 of 34
  • Table of contents

    Publication Year: 1985, Page(s): c1
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    Freely Available from IEEE
  • IEEE Electrical Insulation Society

    Publication Year: 1985, Page(s): c2
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  • Secondary Electron Emission from a Charged Dielectric

    Publication Year: 1985, Page(s):485 - 491
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1149 KB)

    Charges on the surface of fluorinated-ethylene-propylene affect its secondary electron emission coefficient. Measurements with impact energies exceeding that energy which causes peak emission have been made in regions where the local electric field produced by the surface charge is normal to the surface and in regions where it is oblique. The surface of the 6-mm wide specimen was charged to either... View full abstract»

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  • Electrification Phenomena on Insulating Materials in an Ion Flow Field

    Publication Year: 1985, Page(s):493 - 498
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2046 KB)

    Many researchiers have investigated electrical environmental problems under HV transmission lines. Electrification of an object is one of the important factors in the case of dc transmission lines. In this research, electrification of the surface of an insulating material (50 cm square and 5 mm thick PMMA plate) by an ion flow was studied. A rod-plane electrode gap was used to supply the ion flow,... View full abstract»

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  • Charge Simulation Modelling of Three-Core Belted Cables

    Publication Year: 1985, Page(s):499 - 503
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (605 KB)

    A charge simulation method is used to represent sheathed, three-core, belted cables having circular conductors. Each conductor is represented by Nc infinite line charges arranged in a circular pattern inside the conductor. The sheath is represented by Ns infinite line charges arranged in a circular pattern, outside the sheath. It is shown that if the total number of representative charges is in th... View full abstract»

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  • The Effect of Doping on the Voltage Holdoff Performance of Alumina Insulators in Vacuum

    Publication Year: 1985, Page(s):505 - 509
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (806 KB)

    Alumina ceramics doped with various combinations of Cr, Mn, and Ti were fabricated into hollow cylindrical insulators, then assembled into vacuum diodes and tested with 25 ¿s voltage pulses. Four doped alumina ceramics with total dopant levels of 2.6 to 4.7% wt and partial Cr plus Ti dopant levels of 1.0 to 2.4% performed very well. They had voltage holdoffs significantly better (25 to 40%) than ... View full abstract»

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  • Improved Potential Grading Methods with Silicon Carbide Paints for High Voltage Coils

    Publication Year: 1985, Page(s):511 - 517
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (891 KB)

    This paper presents surface potentials and the accompanying thermal analysis on, two improved potential grading methods with silicon carbide (SiC) paints for HV generator coils: (1) double-coating of SiC layers along a coil and (2) combination of a conducting intersheath and a SiC paint. Approximate equations describing the thermal behavior for both methods are derived on the assumption of ideal n... View full abstract»

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  • A Probabilistic Insulation Life Model for Combined Thermal-Electrical Srresses

    Publication Year: 1985, Page(s):519 - 522
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The Weibull distribution is widely used in statistical problems related to aging of solid insulating materials subjected to electrical stress. The main object of this paper is to explain the Weibull probability function in such a way that it can be applied to the statistical analysis of the risk of failure for solid insulating materials or structures subjected to single or combined (in particular ... View full abstract»

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  • Life Characteristics of Medium Size Insulated Wire Subjected to Short Time, High Current Faults

    Publication Year: 1985, Page(s):523 - 528
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (653 KB)

    This paper continues the study of damage done to insulated wire by high currents which occur during the brief time necessary for protective devices to clear a bolted short circuit. The damage was measured by the decrease in dielectric strength related to various values of the time integral of the square of the current. This is called I2t. One major advantage of this approach is the definiteness wi... View full abstract»

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  • Reduction of Surface Charge-Induced Electric Field Enhancement and Increase in AC Surface Flashover Voltage

    Publication Year: 1985, Page(s):529 - 536
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2351 KB)

    Surfactant is painted partially on a cylindrical insulator having a "back-side" (Inner) electrode, to change the distribution of the accumulating surface charge (residual charge) generated by ac partial discharge. The surfactants used are Neogen T®, Catiogen L®, or Tween 20®; the insulating material is polyvinyl-chloride heat shrinkable tube. Ac flashover voltage in air (ACFOV) depends on the s... View full abstract»

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  • The Use of Copper Electrodes for the Comparative Tracking Index Test

    Publication Year: 1985, Page(s):537 - 542
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1912 KB)

    If failure of electrical insulation occurs after a product has been in service for a considerable time, the mechanism involved is usually that of a carbonaceous track which develops between electrodes under conditions of intermittant moisture. A number associated with specific insulations and designed to rank insulations in order of their ability to avoid tracking is known as the comparative track... View full abstract»

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  • Thermal Shocks Due to Repeated Moderate Arcing on Line Insulators

    Publication Year: 1985, Page(s):543 - 548
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1431 KB)

    Thermal shocks on line insulators produced by arcs, which may be intentionally repeated due to reclosing, or randomly caused by arc-backs etc., are investigated. A quantitative analysis of this phenomenon has been developed. The total arc power at the arc-insulation interface required for the analysis has been estimated experimentally for currents up to 850 A. Arc power appears to be proportional ... View full abstract»

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  • Silicone Elastomer Vulcanized by the Hydrosilation Reaction and its Influence on Properties of a Modified Mos Device

    Publication Year: 1985, Page(s):549 - 555
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (935 KB)

    A p-MOS device in which the gate position is incompletely covered by the gate electrode has been used as a test device to estimate influence of silicone elastomer on residual current after gate operation. The elastomer was vulcanized by the hydrosilation reaction. It was found that the residual current could be represented as a function of the hardness and electrical conductivity of the silicone e... View full abstract»

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  • The Effect of the Polymer Coating on Residual Current of Mos Devices

    Publication Year: 1985, Page(s):557 - 560
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (562 KB)

    The influence of polyimides on seniconductor devices has been studied by measuring the residual current in an MOS test device in which the gate position was0 incompletely covered by the gate electrode. Residual currents were found to be a function of the heat-treatment temperature of the coated polyamic acid. At first the residual current decreased with increasing heat-treatment temperature, until... View full abstract»

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  • The Effect of Absorbed Oxygen on Electrical Treeing in Polymers

    Publication Year: 1985, Page(s):561 - 566
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2551 KB)

    This paper describes the effect on electrical treeing of oxygen absorbed in physical spaces such as microvoids or free volume in polyethylene. The ac tree initiation and growth were investigated at room temperature using untreated samples and also samples degassed by a vacuum pump. The tree starting voltage of the degassed samples is much higher than that of untreated samples. The experimental res... View full abstract»

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  • Some Dielectric and Mechanical Properties of Heat Treated Biaxially Drawn Pet Films

    Publication Year: 1985, Page(s):567 - 573
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1975 KB)

    The dc dielectric strength of heat-treated biaxially drawn polyethylene terephthalate (PET) is studied under mechanical stresses. The sample is prepared on films with a draw ratio of 3.3x3.9 obtained by a continuous process. To study the effect of crystallinity on the dielectric strength, the sample that is held to constant size is annealed for durations of 1 and 60 min in a silicone oil bath main... View full abstract»

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  • Interface Traps and Swelling of Polypropylene Films Immersed in Silicone Oils

    Publication Year: 1985, Page(s):575 - 580
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (806 KB)

    Biaxially stretched PP (polypropylene) films immersed in silicone oil showed TSC peaks P1 and P2 due to ions trapped in the oil-PP interface region. Their peak temperatures were lowered by oil-PP interaction such as swelling. The equations governing the swelling of a crystalline polymer were deduced from the analogy of the swelling of a cross-linked polymer. The experimental values of the degree o... View full abstract»

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  • Electrical Breakdown of N20-SF6, N20-CCL2F2 and N2O-CO2 Gas Mixtures

    Publication Year: 1985, Page(s):581 - 585
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (725 KB)

    Using 112 mm diameter, Harrison profile stainless steel polsihed electrodes, uniform field dc breakdown voltages are measured for N2O mixtures with SF6, CCl2F2, and CO2 in the pressure range of 0.02 to 1 MPa and gap lengths up to 20 mm. The results show that the breakdown strength (E8/P) of SF6, CCl2F2 and their mixtures decreases with pressure while it remains practically constant for N2O and N2O... View full abstract»

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  • A Modek for the Production of Initial Electrons by Detachment of SF-6-IONS

    Publication Year: 1985, Page(s):587 - 594
    Cited by:  Papers (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1123 KB)

    Experiments with positive pulses in a sphere-to-plane gap give evidence of the fact that initial electrons are provided by collisional detachment of SF6 ions. The position-dependent density of negative ions prior to a pulse application is calculated numerically for different geometries. The results are then included in a quantitative model for the electron production rate which is based on physica... View full abstract»

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  • Ionization and Attachment Coefficients in Freon-12 and Co2 Gas Mixtures

    Publication Year: 1985, Page(s):595 - 599
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Uniform-field steady-state ionization growth currents are measured in CO2 and CCl2F2 + CO2 mixtures. Effective ionization, ionization and attachment coefficients are reported in the range of 2. lx10-15 ¿ E/N ¿ 5.4x10-15 V cm2. Experimental E/N limits are observed for several CO2 concentrations in the mixture, and also sparking potentials are measured as a function of Nd in the range of l.65x1017... View full abstract»

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  • Positive Corona Processes in Electronegative Gaseous Dielectrics

    Publication Year: 1985, Page(s):601 - 607
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1090 KB)

    Events occurring in a positive point/plane gap Subjected to quasi-step function voltages have been monitored by both terminal and optical measurements. Evidence is presented on the importance of the critical al initiation volume in the vicinity of the anode in determining both the time lag and the luminous extent of the corona. Changes in the corona characteristics are explained on the basis of sp... View full abstract»

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  • Drying Process of Insulating Materials of Transformers

    Publication Year: 1985, Page(s):609 - 618
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1075 KB)

    The insulating systems of transformers must be dried before impregnation with insulating oil. Some works dealing with the drying process of insulating materials have been published, however, practical methods to analyze the drying process have not. In order to develop a practical method, the drying process of transformer boards was investigated, and results obtained in this investigation were appl... View full abstract»

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  • Influence of Mica Tapr Application on Insulation Characteristice of High Voltage Rotating Machinery Coils

    Publication Year: 1985, Page(s):619 - 624
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (863 KB)

    This paper studies the influence of mica tape application methods on the insulation characteristics of HV rotating machinery coils generally. Resin impregnability , electrical failure properties and mechanical properties were tested on specimens prepared by sheets or tapes with different widths. From these test results, it was clarified that these insulation characteristics were influenced signifi... View full abstract»

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  • Impregnation Study of Porous Elements of High-Voltage Components

    Publication Year: 1985, Page(s):625 - 627
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1080 KB)

    The impregnation of HV components is important if not critical for reliable operation. Fine windings, porous insulation such as kraft paper and pressboard, and similar elements need to be impregnated for good thermal conductivity, mechanical strength and, in the case of insulation, to minimize internal discharges. Although widely used, there appears to be little systematic work done to explain the... View full abstract»

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  • Physical Behavior of Paraffinic Oils at Low Temperatures

    Publication Year: 1985, Page(s):629 - 638
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1592 KB)

    This paper presents a study and an analysis of the low-temperature physical properties of a paraffinic oil refined from Canadian feedstock. The study demonstrates that a significant attribute of this oil is the mechanism of wax formation below the cloud point, This wax formation can explain the higher low temperature viscosity of the oil as compared to that of a naphthenic oil, its non-Newtonian b... 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