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IEEE Transactions on Electrical Insulation

Issue 4 • Aug. 1985

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Displaying Results 1 - 25 of 40
  • Table of contents

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

    Publication Year: 1985, Page(s): c2
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  • 11th Interational Symposium on Discharges and Electrical Insulation in Vacum

    Publication Year: 1985, Page(s):657 - 682
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  • Field Emission and Vacuum Breakdown

    Publication Year: 1985, Page(s):659 - 670
    Cited by:  Papers (50)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4568 KB)

    A survey is given on the development of the surface of field emitters during the process of explosive emission. Solid cathodes have been compared to liquid cathodes. The surfaces have been probed by application of sequences of nanosecond voltage pulses with different polarity (the first pulse serving for excitation of the surface, the following for measuring the emission current). As a result it h... View full abstract»

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  • On Contamination on Electrode Surfaces and Electric Field Limitations

    Publication Year: 1985, Page(s):671 - 681
    Cited by:  Papers (47)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2513 KB)

    Broad area electrodes, especially in technical systems, are contaminated by oxides, adsorbates, and dust in mean thicknesses between 1 and 100 nm depending on surface preparation. These contaminants yield electric field limitations in three respects: (1) adsorbates and dust enhance the field emission of electrons (FE); (2) oxides, adsorbates and dust n enhance the secondary electron emission (SEE)... View full abstract»

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  • Theory of Explosive Electron Emission

    Publication Year: 1985, Page(s):683 - 689
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1726 KB)

    This review represents some aspects of the theory of explosive electron emission. This is a single kind of emission that enables one to obtain electron beams with currents up to 106 and a density of the emission current from the cathode of 1012 A/m2 and more. A classification is suggested that permits to distinguish some specific aspects of such a complicated phenomenon as explosive emission. Quan... View full abstract»

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  • Erratum

    Publication Year: 1985, Page(s): 690
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  • Erratum

    Publication Year: 1985, Page(s): 690
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  • Prebreakdown Conduction in Vacuum Gaps under Switching Impulse Excitations

    Publication Year: 1985, Page(s):691 - 695
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (745 KB)

    The present investigation concerns prebreakdownn conduction in vacuum gaps under slow impulses. Hemispherical, cal, plane, and needle electrodes have been used in a vacuum emvironment of better than 0.1 mPa. The gap spacings were 0.5, 1, and 1.5 mm. The front times ranged from 200 μs to 5 ms. The results indicate that prebreakdown currents were smaller than the highest sensitivity of 10-7 ... View full abstract»

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  • Dielectric and Electrical Insulation Society Technical Committee Members

    Publication Year: 1985, Page(s):696 - 714
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  • The Anode Hot Spot Regime in Vacuum Prebreakdown

    Publication Year: 1985, Page(s):697 - 699
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (378 KB)

    A particular discharge regime seems to be associated with the presence of "hot spots" on the anode surface during vacuum prebreakdown, leading to increased stability. This communication ation is concerned with the description of some features of this regime, local gas desorption, current jumps on Fowler-Nordheim plots at spot ignition. View full abstract»

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  • On the Impulse Electrical Breakdown of Centimeter Vacuum Gaps

    Publication Year: 1985, Page(s):701 - 703
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1281 KB)

    This paper contains information on prebreakdown conduction, discharge radiation in the visible spectral region, and vacuum gap breakdown voltage in pulses of up to 1.5 MV. The experiments were carried out in a technical vacuum using large area electrodes spaced by 60 mm. The mechanisms of the discharge initial stage evolution in large vacuum gaps are discussed. View full abstract»

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  • Conditioning Process of Electropolished Electrodes by Field Emission Current in Vacuum

    Publication Year: 1985, Page(s):705 - 708
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (525 KB)

    Results of an experimental investigation of the electrode conditioning process by field emission current in vacuum are presented. Steel, copper, and aluminum electrodes, electrolytically polished, were used. It was found that the optimum value of the emission current, maintained during the process of conditioning electordes, depends on the kind of metal and on the roughness of the electrode surfac... View full abstract»

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  • RF Sparking Experimetns

    Publication Year: 1985, Page(s):709 - 713
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    Voltage breakdown limits the maximum accelerating and focusing fields and thereby the maximum beam currents in RFQ injector linacs. To determine this crucial design parameter, sparking tests have been done in a special cavity. Spark rate and voltage breakdown were investigated at different electrode geometries and materials. Mean gap fields up to 67 MV/m have been obtained. The influence of pulse ... View full abstract»

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  • Breakdown Voltage of Conditioned 24 kV-Vacuum Tubes as a Function of Ramp Rate

    Publication Year: 1985, Page(s):715 - 720
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2731 KB)

    For the determination of the dielectric strength of different factory-made vacuum interrupter tubes, in the short time range, the breakdown voltage was measured as a function of the voltage ramp rate for various contact distances by applying linear rising impulse voltage with a steepness from 1 kV/ μs up to 3 MV/ μs. Preconditioning of the contacts was performed with a series of im... View full abstract»

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  • The Initiation of Vacuum Breakdown under Alternating Voltage

    Publication Year: 1985, Page(s):721 - 724
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (581 KB)

    The paper presents experimental studies on the properties of vacuum insulating systems at power frequency ac voltage. The author points to differences between two kinds of voltage, dc and ac voltage, influencing then condition of insulation systems. These differences consist, first of all, in mechanical and thermal fatigue caused by ac voltage to the surface electrode layer as a result of periodic... View full abstract»

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  • Secondary Electron Emission Yields of Carbon Coated Copper and Niobium Real Surfaces

    Publication Year: 1985, Page(s):725 - 728
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (488 KB)

    Real copper and niobium surfaces, that is surfaces which have been in contact with the air and cleaning agents, and in consequence are covered with a thin layer of adsorbed molecules, have a total secondary electron yield (SEY) greater than one. To reduce SEY, various carbon coatings, deposited on real surfaces have been studied: thin evaporated graphite films, implanted C+ ions, sprayed carbon an... View full abstract»

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  • A Cyclical Explosive Model of the Cathode Spot

    Publication Year: 1985, Page(s):729 - 734
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1041 KB)

    A fundamental role of microexplosions on the cathode in discharge initiation and development is established on the basis of the author's earlier studies of pulsed vacuum discharges. Upon analyzing some methods of vacuum arc initiation, the conclusion is reached that all of them are based in the end on the occurrence of a microexplosion on the cathode. Self-maintenance of an arc is due to the fact ... View full abstract»

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  • The Effect of Gas on the Development of a Vaccum Arc with a Hollow Anode

    Publication Year: 1985, Page(s):735 - 737
    Cited by:  Papers (10)
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    The paper describes the results of a study of the formation of a low-pressure space arc with an igniting device and a large-size hollow anode. It is shown that the time of arc formation tf is determined by the dimensions of the hollow anode, the type of gas, and the gas pressure. As the pressure is increased from 4x10-3 to 4x10-2 Pa, tf decreases considerably and the effect of the gas type (air, A... View full abstract»

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  • 1986 IEEE International Symposium on Electrical Insulation

    Publication Year: 1985, Page(s): 738
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  • Post-Arc Current After High-Current Interruption in Vacuum

    Publication Year: 1985, Page(s):739 - 744
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (801 KB)

    Detailed measurements of post-arc current in a vacuum were made. This investigation was particularly characterized by conducting post-arc current measurements following high arc currents (36 kA rms maximum). Postarc current increases with main arc current, and shows a sharp increase when the main arc current reaches certain value. The magnitude of post-arc current for each contact material differe... View full abstract»

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  • Research on the Recovery Processes of Vacuum Gaps After 50 Hz Sinusoidal Current Zero

    Publication Year: 1985, Page(s):745 - 749
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (602 KB)

    The paper reports on recovery processes of vacuum gaps after 50 Hz sinusoidal current zero. We used a vacuum interrupter with a copper button electrode, The measured recovery time was 60, 76, 100 μs for currents of 3, 6, and 8 kA, respectively. The theoretical analysis matches the experimental result to a certain extent. The conclusion is that the recovery time depends strongly on the arci... View full abstract»

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  • 1986-1987 Congressional Fellowships a Congressional Internship for Members of IEEE

    Publication Year: 1985, Page(s): 750
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  • The Effect of the Electric Circuit on the Current Transients of the Vacuum Niear the Current Zero

    Publication Year: 1985, Page(s):751 - 754
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1246 KB)

    The results of the detailed quantitative and qualitative analysis of the current transients of the vacuum arc near ac zero are presented. Based on the current oscillograms obtained experimentally during unstable burning of the vacuum arc, we found some characteristic transient forms have been distinguished as well as their close relation to the switched-off circuit parameters. The set of theoretic... View full abstract»

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  • Triggered Vacuum Gaps in a High Power Three-Phase Synthetic Test Circuit

    Publication Year: 1985, Page(s):755 - 758
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1313 KB)

    In a three-phase synthetic test circuit triggered vacuum gaps (TVG's) are applied as fast switches. To discharge the six capacitor banks (50 kV, 12.5 kJ) of the reignition installation in that test circuit, sealed-off TVG's are used with a glass-ceramic surface trigger. To switch on a low oscillating current in each phase of the voltage injection installation, three continuously pumped TVG's are u... 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