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Electrical Insulation Magazine, IEEE

Issue 4 • Date July-Aug. 2004

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Displaying Results 1 - 25 of 31
  • IEEE Electrical Insulation Magazine - Front cover

    Page(s): 0_1
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  • Electrical Manufacturing Expo 04

    Page(s): 0_2
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  • IEEE Electrical Insulation Magazine Table of contents

    Page(s): 1
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  • IEEE Electrical Insulation Magazine Society Information

    Page(s): 2
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  • Duo-career track - Editorial

    Page(s): 3
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  • From the Editor's desk

    Page(s): 4 - 5
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  • Condition assessment of distribution PILC cables from electrical, chemical, and dielectric measurements

    Page(s): 6 - 12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (702 KB) |  | HTML iconHTML  

    A study was conducted to evaluate some new diagnostic techniques enabling users to effectively manage their paper-insulated, lead-covered (PILC) cable assets. The objective is to present the results obtained with four diagnostic techniques designed for use on in-service cables, but used only to a limited extent on PILC cables. These techniques are LIpATEST leakage current test method, isothermal relaxation current (IRC), return voltage method (RVM), and dielectric spectroscopy. In addition, the AC breakdown strength of the cable was also measured. The differences between the titration measurements and the predictions made by AC breakdown and the non-destructive techniques, such as RVM and dielectric spectroscopy, were noted with specific reference to moisture content in the cables. The different diagnostic techniques used in the study gave a reasonably consistent and coherent evaluation of the insulation condition of several field-aged PILC cables. The moisture content deduced from RVM and dielectric spectroscopy does not agree with Karl-Fischer titration of the same samples. It is suggested that aging induces more detrimental polarization processes in the cable oil, whose impact on electrical properties is still unknown but appears to be much more influential than moisture for the cables tested. The results confirm a previous suggestion that PILC cables kept under load are not significantly affected by water ingress. View full abstract»

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  • The role of inorganic fillers in silicone rubber for outdoor insulation alumina tri-hydrate or silica

    Page(s): 13 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1568 KB) |  | HTML iconHTML  

    A systematic study to understand how alumina tri-hydrate (ATH) and silica fillers improve the erosion resistance of silicone rubber during dry band arcing showed that the thermal conductivity of the resulting composite material is the main criterion governing material erosion. The thermal conductivity of the composite material is dependent on the thermal conductivity, concentration, particle size, and bonding of the filler particles to the silicone matrix. In this context, either filler can be shown to perform better than the other, depending on the formulation, in the ASTM inclined plane tracking and erosion test. Therefore, the industry perception that ATH filler imports better erosion resistance than silica in silicone rubber can be misleading. The release of water of hydration from ATH appears to have a secondary effect that may be more relevant in silicone compositions having a low concentration of a filler. View full abstract»

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  • A rational consideration of space charge

    Page(s): 22 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (304 KB) |  | HTML iconHTML  

    Space charge formation and its increase with field under DC conditions is not a mystical phenomenon. The increase in space charge with applied field is an obvious and inevitable result of the interaction of field-dependent current density with spatially inhomogeneous resistivity. For common polymeric dielectrics, the current density makes a transition from a linear function of field to an exponential function of field at around 10 kV/mm. This causes a similar transition in the sample space charge in the same field region. However, this transition has no obvious connection with aging, and if it does prove to have a connection, the driving force is the rapidly increasing current density and not the space charge, which is a result thereof. As to the issue of the accuracy of space charge measurements, it may be more important to focus on providing a physical mechanism for 1-eV deep traps at an average separation of 3 nm within a polymeric dielectric. This would bring about the ability to engineer important dielectric properties as well as improved understanding of the physical basis of aging and other important phenomena in dielectrics. View full abstract»

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  • Inside EIC

    Page(s): 28 - 30
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  • EME/EIC Volunteers

    Page(s): 31
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  • DEIS News

    Page(s): 32 - 35
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  • Call for Papers for Workshops/Focus Group Discussions During DEIS-Sponsored Conferences in 2005

    Page(s): 36
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  • Industry News

    Page(s): 37 - 38
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  • D&EI Folks - Takeshi Sakakibara

    Page(s): 39
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  • New magnet wire requirements on the horizon - NEMA News

    Page(s): 40
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  • Recent activities of Japan Electric Cable Technology Center - News from Japan

    Page(s): 41 - 42
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  • The third international nanotechnology exhibition & conference was held in Tokyo - News from Japan

    Page(s): 43 - 44
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  • Protection devices and systems for high-voltage applications - Book Review

    Page(s): 45
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  • Introduction to geometrical optics - Book Review

    Page(s): 45
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  • Plastics additives - volume 3 - an industry guide, 3rd Ed. - Book Review

    Page(s): 45 - 46
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  • Annual review of physical chemistry, vol. 53 - Book Review

    Page(s): 46
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  • MEMS and NEMS - systems, devices, and structures

    Page(s): 46
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  • Annual reviews of materials research, vol. 32 - Book Review

    Page(s): 46
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  • Chip scale packaging for modern electronics - Book Review

    Page(s): 47
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Aims & Scope

The EI Magazine is specifically concerned with publishing articles in the development and characterization of the dielectric, chemical, mechanical, and environmental properties of all vacuum, gaseous, liquid, and solid electrical insulation, and with utilization of these materials in circuits and systems under conditions of use.

Full Aims & Scope

Meet Our Editors

Co-Editor-in-Chief
Edward Cherney

Co-Editor-in-Chief
Robert Fleming