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IEEE Transactions on Electrical Insulation

Issue 2 • Apr 1989

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Displaying Results 1 - 25 of 30
  • Research and development of miniaturized electrets

    Publication Year: 1989, Page(s):255 - 266
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (852 KB)

    A description is given of the realization of small electrets, using techniques generally applied in the fabrication of integrated circuits and microsensors. Attention is paid to the different electret decay mechanisms and their relative contributions to the overall stability of miniaturized electrets. A process is described by which polymer electrets such as Teflon-FEP and PTFE (polytetrafluoroeth... View full abstract»

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  • Tensile and bending piezoelectricity of single-film PVDF monomorphs and bimorphs

    Publication Year: 1989, Page(s):249 - 254
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    Films of 22 μm thick polyvinylidenefluoride (PVDF) are poled with partially penetrating monoenergetic electron beams, resulting in monomorph polarizations (zero polarization over part of the sample thickness and large polarization over the remaining part) or bimorph polarizations (polarization changing its sign within the sample) with corresponding distributions of piezoelectricity. Experimenta... View full abstract»

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  • Prebreakdown currents: Basic interpretation and time-resolved measurements

    Publication Year: 1989, Page(s):297 - 308
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (692 KB)

    The relation between the motion of charges in an electrode gap and the current induced in the external circuit is described on the basis of energy considerations and on the basis of the Ramo-Shockley theory. It is shown that both approaches are applicable, and mutually consistent, not only for gas-filled gaps but, if applied properly, also when the gap is partially filled with a solid dielectric. ... View full abstract»

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  • Ion-ion recombination in electronegative gases

    Publication Year: 1989, Page(s):343 - 348
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    Ion-ion recombination was investigated experimentally in some electronegative gases (SF6, N2O, CClF3, CF4, C3F6, and C3F8 ) in the pressure range from a few pascals up to several hundred kilopascals. Additionally, in SF6, the temperature influence on the recombination at constant number densities was... View full abstract»

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  • Breakdown of polyurethane hard-foam insulation under short-time HV stress

    Publication Year: 1989, Page(s):239 - 248
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (720 KB)

    Breakdown performance of dielectric material with microporous structure is investigated under short-term voltage stress. The material is a self-skinning polyurethane hard foam. Experimental research on impulse voltage strength and partial-discharge behavior in AC run-up tests shows aspects of gas breakdown in the pores. The structure of the material and the form and size of pores are investigated ... View full abstract»

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  • Breakdown phenomena in liquid helium

    Publication Year: 1989, Page(s):155 - 166
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (732 KB)

    Scientific interest in the breakdown in liquid helium comes from its unique physical properties. Engineers also are interested because liquid helium is a fairly good basic insulation agent for superconducting devices. Results obtained by various laboratories are compared and discussed. Special emphasis is given to results from Central Europe, but other work has been considered also. Breakdown can ... View full abstract»

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  • From physics to metaphysics: Johann Wilhelm Ritter

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (80 KB)

    The career and scientific accomplishments of Ritter, who was born in 1776 in Samitz, Silesia, are described. Ritter carried out experiments on galvanism and published his findings as a book. His main result was that galvanism is active also in inorganic nature, and he showed that the Volta series of metals was due to their ability to react with oxygen. Although he could be considered as the father... View full abstract»

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  • Determining local state densities in spatially inhomogeneous samples from steady-state space-charge-limited currents

    Publication Year: 1989, Page(s):223 - 227
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The effect of spatial inhomogeneity of the distribution of local levels on the reliability of the determination of the densities of these states from steady-state space-charge-limited current-voltage characteristics is discussed. Numerical calculations of correction factors show that experimentally determined apparent densities of local states are close to spatially averaged values. In some cases,... View full abstract»

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  • Electrode polarization in polymeric dielectrics

    Publication Year: 1989, Page(s):205 - 214
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (560 KB)

    Electrode polarization in polymeric dielectrics is considered, and a simple model that describes the processes phenomenologically and accounts for the observable manifestations of this type of polarization is suggested. Notwithstanding the fact that certain significant parameters characterizing the model are obtained from a single type of measurement, e.g. the time dependence of the charging curre... View full abstract»

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  • Partial discharges in ellipsoidal and spheroidal voids

    Publication Year: 1989, Page(s):335 - 342
    Cited by:  Papers (139)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    Transients associated with partial discharges in voids can be described in terms of the charges induced on the terminal electrodes of the system. The relationship between the induced charge and the properties which are usually measured is discussed. The method is illustrated by applying it to a spheroidal void located in a simple disk-type spacer View full abstract»

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  • Predischarge development in N2 and SF6 at high gas pressure

    Publication Year: 1989, Page(s):285 - 296
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    The predischarge development in compressed N2 (0.1 to 0.6 MPa) and SF6 (0.1 to 0.24 MPa) has been investigated. The measurements were performed for approximately homogeneous field distribution with positive DC-voltage of up to 200 kV. Highly sensitive framing of the luminous phenomena was done with a gated microchannel image intensifier. An optical delay line allowed recordin... View full abstract»

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  • Dielectric small-signal response by protons in amorphous insulators

    Publication Year: 1989, Page(s):185 - 197
    Cited by:  Papers (45)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (692 KB)

    A model is proposed in which protons fluctuate between neighboring atomic shells either by thermal activation or by a tunneling process. The transition probability of the protons depends on the distance between the adjacent atoms. The characteristic pair distribution function of interatomic distances in the amorphous state is a consequence of locally minimizing the potential energy of the atoms du... View full abstract»

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  • Semiconductor-based electret sensors for sound and pressure

    Publication Year: 1989, Page(s):267 - 276
    Cited by:  Papers (10)  |  Patents (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (704 KB)

    The theory and experimental results for integrated electret-based silicon sensors for the detection of sound and pressure are presented. A silicon electret microphone for use in hearing-aids is described. It has an experimentally determined sensitivity of 19 mV/Pa in the frequency range of 50 Hz to 10 kHz. The realization of a pressure sensor for application in catheter-tip blood-pressure measurem... View full abstract»

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  • The mechanism of leader breakdown in electronegative gases

    Publication Year: 1989, Page(s):309 - 324
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1040 KB)

    A survey is given of the present state of understanding of leader breakdown of electronegative gases in nonuniform field gaps and under fast-rising voltage waveforms. The basic physical processes involved are the formation of a pulsed streamer corona, the transformation of one of the streamers into a leader step, the temporal development of the leader channel, and the stepped propagation of the le... View full abstract»

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  • Charge migration in irradiated polyethylene

    Publication Year: 1989, Page(s):349 - 351
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    Results are presented on the transient electrical conductivity observed in ultrahigh-molecular-weight polyethylene irradiated with nanosecond pulses of 3 MeV electrons. The data were obtained by measuring the microwave absorption with microwaves in the 26.5 to 38 GHz range, using the time-resolved microwave conductivity technique. Charge migration is observed with an average lifetime of approximat... View full abstract»

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  • Implications from the influence of electrohydrodynamic motion on breakdown with respect to the discharge mechanism in dielectric liquids

    Publication Year: 1989, Page(s):169 - 174
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    Electrical discharge measurements with constant voltage pulses in a thin dielectric liquid layer between plane-parallel electrodes provide information about the dielectric strength as a statistical distribution of the time lags to breakdown. Under a large variety of circumstances, the time-lag distributions are composed of two main parts, termed the fast and the normal components. The nature of th... View full abstract»

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  • Surface discharges on contaminated epoxy insulators

    Publication Year: 1989, Page(s):229 - 237
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    Moisture layers with low layer conductivity are characterized by low power dissipation, e.g. 50 mW for the epoxy resin model post insulator under investigation. Under those conditions, no temperature-related dry zones appear, but micro partial discharges (PDs) cannot be excluded. The appearance of these discharges depends on the voltage stress, the surface properties, and the relevant climatic con... View full abstract»

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  • Dielectric phenomena in semicrystalline polymers

    Publication Year: 1989, Page(s):215 - 222
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    For the application of polymers in insulation systems it is essential to understand the dielectric phenomena leading to distinct electrical properties such as conductivity, permittivity, or electrical strength. It is generally accepted that space-charge formation plays an important role in these complex interactions, causing distortion of the electric field determined by the electrode configuratio... View full abstract»

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  • Macroscopic friction and dielectric relaxation

    Publication Year: 1989, Page(s):199 - 203
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (292 KB)

    Dielectric relaxation is known to depend on whether the process is controlled by field strength or by charge density. The aim of this study is to give mechanical meaning to the constant field (or transversal) relaxation time τ and the constant charge (i.e. constant displacement or longitudinal) relaxation time θ. First, it is demonstrated that the formal difference between field and char... View full abstract»

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  • Electrical aging tests on epoxy insulators in GIS

    Publication Year: 1989, Page(s):277 - 283
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    Due to the relatively small insulator dimensions in gas-insulated switchgear (GIS), the electrical stressing is high by comparison to that of insulators for conventional switchgear. Aging tests on a large number of full-sized insulators in several vessels in an outdoor test station have been carried out to determine the stress limits. The tests, with voltages of several hundred kilovolts, last for... View full abstract»

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  • An experimental method to determine the electrostatic field enhancement factor of a practical conductor surface

    Publication Year: 1989, Page(s):325 - 333
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (544 KB)

    A method of determining the field enhancement factor of a practical conductor is presented. The method is developed from a modified theory of discharge onset in a gaseous medium. This modification incorporates the influence of conductor surface roughness. Onset data from an experimental study that utilized electrodes of varying surface roughness are examined, and the results obtained using the pro... View full abstract»

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  • Agoston Budo

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (72 KB)

    The career and scientific accomplishments of Budo are summarized. The influence of Debye on Budo is noted. A successful teacher, Budo also is well known for his textbooks View full abstract»

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  • Electrostatic properties of aged transformer oil

    Publication Year: 1989, Page(s):175 - 178
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (228 KB)

    The results of an investigation of the changes induced in transformer oil under the influence of thermal aging are presented. The investigations were carried out on various types of oil in order to study their electrostatic properties as a function of the aging process. A measurement system with a rotating disk developed by the author was used. It was discovered that the aging process causes quant... View full abstract»

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  • High voltages for particle acceleration from thunderstorms: A. Brasch and F. Lange

    Publication Year: 1989
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (64 KB)

    An early experiment of two German physicists, A. Brasch and F. Lange (1930), who conceived the idea of harnessing the huge potential differences between charged clouds of thunderstorms and the earth, is briefly described. Voltage pulses of 8 to 15 MV amplitude were observed. Difficulties existed in bringing this potential down to the earth surface, and no discharge tube for the acceleration of par... View full abstract»

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  • Georg Christoph Lichtenberg

    Publication Year: 1989, Page(s):203 - 204
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB)

    The career and scientific contributions of Lichtenberg are described. Lichtenberg played an important role in the development of physics, chemistry, and poetry in Germany in the eighteenth century. He conducted many experiments to clarify the nature of electricity 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