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IEEE Transactions on Dielectrics and Electrical Insulation

Issue 5 • Oct 1997

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Displaying Results 1 - 12 of 12
  • Performance characteristics of dielectrics in the presence of space charge

    Publication Year: 1997, Page(s):544 - 557
    Cited by:  Papers (38)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1428 KB)

    The short and long-term dielectric behavior of a number of representative electrical insulating systems is compared in the presence of space charge. Dielectric materials, used both in the communications and power application areas, are considered. In this overview, particular attention is given to thin inorganic films, organic solid-liquid and solid polymer systems as regards to the manner in whic... View full abstract»

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  • Nanoscopic aspects of electronic aging in dielectrics

    Publication Year: 1997, Page(s):507 - 543
    Cited by:  Papers (76)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4164 KB)

    This paper presents nanoscopic aspects of electronic aging in dielectrics, as the result of the interaction of excess non-thermalized carriers with the media. Hot electrons are hypothesized as the major source of non-thermal carriers and shown to be a decisive factor in electrical breakdown. The interaction of hot electrons with atomic and molecular solids forming dielectric films is investigated ... View full abstract»

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  • Review of space charge measurements in dielectrics

    Publication Year: 1997, Page(s):644 - 656
    Cited by:  Papers (88)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1396 KB)

    In the last two decades, a significant effort has been directed to understand the internal charge distributions in dielectrics. This has resulted in the development of a number of methods which give detailed information about space charge distributions. This review presents the evolution of several experimental approaches for the determination of spatial charge and field distributions in dielectri... View full abstract»

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  • Charge distribution and transport in polymers

    Publication Year: 1997, Page(s):614 - 628
    Cited by:  Papers (87)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1572 KB)

    Experimental work on charge distributions and charge transport in polymer films is reviewed. For studying the charge distributions in the thickness dimension, thermal or acoustic techniques are used with resolutions down to ~1 μm. The polymer samples usually are charged with corona, electron beam or thermal methods. Observation of the change of charge and polarization distributions with time al... View full abstract»

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  • The role of trapped space charges in the electrical aging of insulating materials

    Publication Year: 1997, Page(s):496 - 506
    Cited by:  Papers (217)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1108 KB)

    An investigation of the effect of trapped space charges on the aging of polymeric insulating materials subjected to thermo-electrical stress is reported in this paper. Possible scenarios of degradation mechanisms, thermally activated, but accelerated by the presence of space charges, are examined. The model which derives from this approach has some interesting features: it is characterized by elec... View full abstract»

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  • Space charge characterization for the 21th century

    Publication Year: 1997, Page(s):558 - 584
    Cited by:  Papers (50)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4612 KB)

    Various methods of characterizing insulating materials by their ability to take up charge, retain it, and release it, are reviewed critically in search of measurable quantities that could be used to predict material behavior under stress up to failure conditions. Space charge characterization data on different types of materials from polymers to inorganic single crystals and ceramics are surveyed.... View full abstract»

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  • Dielectric surface flashover in vacuum. Experimental design issues

    Publication Year: 1997, Page(s):657 - 662
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (652 KB)

    In order to determine the influence of intrinsic material properties of dielectric materials on high field surface flashover characteristics in vacuum, it is important that we minimize or eliminate the influence of the experimental test structure on the high field processes. In this paper we shall examine the flashover characteristics of polycrystalline alumina insulators, using a lateral test str... View full abstract»

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  • Dielectric phenomenon of living matter

    Publication Year: 1997, Page(s):629 - 643
    Cited by:  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1592 KB)

    Surges of current in the polarization and depolarization curves for living tissue refer to trapped charges on domain boundaries within the cytoplasm or on cell membranes. An electric field is shown to provoke an elastic deformation of living cells with a relaxation nature. The diagram of a cell with domains of neutral-normal and polarized-excited states is described. An electromechanical model wit... View full abstract»

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  • Optical emission due to space charge effects in electrically stressed polymers

    Publication Year: 1997, Page(s):585 - 603
    Cited by:  Papers (81)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2248 KB)

    Electrical wear-out and dielectric breakdown of insulating polymers involve dissipation to the lattice of the energy of mobile or trapped space charges. Optical emissions are proof of such energy releases and can be used to define the onset of electrical aging and to investigate the dissipation mechanisms. They also could provide a basis for monitoring the degradation rate. The situation considere... View full abstract»

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  • Electronic and defect processes in oxides. The polaron in action

    Publication Year: 1997, Page(s):604 - 613
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1080 KB)

    The basic processes involving space charge are charge localization (including trapping) and charge transport. These processes may be associated with energy localization. At the molecular scale, energy localization is an initiator of electrical breakdown and aging phenomena. At the mesoscopic scale, energy localization generates the damage observed macroscopically and is associated with discharge. ... View full abstract»

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  • Charge buildup in lossy dielectrics with induced inhomogeneities

    Publication Year: 1997, Page(s):477 - 486
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (948 KB)

    In addition to their normal inhomogeneities, insulation may also become inhomogeneous under stress, for instance if their temperature is not uniform. Then, a charge density builds up wherever material properties such as conductivity and permittivity are not uniform. This is the case of HVDC cables, in which the core is heated by the Joule effect, while the sheath remains at near ambient temperatur... View full abstract»

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  • A molecular model to evaluate the impact of aging on space charges in polymer dielectrics

    Publication Year: 1997, Page(s):487 - 495
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    The understanding of space charge effects depends largely on how concurrent phenomena, such as thermal and electrical aging are understood. A model describing thermal and environmental aging of dielectric polymers is discussed. The model essentially is based on the rate theory associated with the name of Eyring. One basic feature of the model is that the proper energy term is a free energy of acti... View full abstract»

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Aims & Scope

IEEE Transactions on Dielectrics and Electrical Insulation contains topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use. 

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Reuben Hackam