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Electrical Insulation Magazine, IEEE

Issue 6 • Date Nov.-Dec. 1990

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  • Influence of electrical insulation on design and performance of power equipment

    Page(s): 7 - 10
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (342 KB)  

    The potential impact of research and development on new dielectric materials on high-voltage designs for transformers, capacitors, generators, and SF/sub 6/-insulated equipment is reviewed in the context of limitations imposed by present tests and material properties. The potential technical and economic benefits of new dielectric systems are described and directions indicated for future research and development. The following impacts on power equipment are anticipated: improved reliability, electrical performance and economics of most systems, improved mechanical performance of generators and transformers, improved thermal rating of transformers and cables, and a positive environmental impact for transformers and capacitors.<> View full abstract»

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  • Partial discharge. III. Cavity-induced PD in solid dielectrics

    Page(s): 11 - 16
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    For pt.II see ibid., vol.6, no.5, p.35 et seq. (1990). The question of how to relate the magnitude of the measured, effective, partial discharge (PD) to the size, shape, and position of the cavity within a solid dielectric system is addressed. The causes of cavities are examined, and a brief review of gas breakdown is given. It is then shown that for a range of geometries, such as parallel plate and coaxial, one can develop analytic solutions (i.e. formulas), and that for any system the solution can be found using computer-based methods for calculating the electric field throughout a sample. Scaling rules are derived from the physical model.<> View full abstract»

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  • Technical progress of EMI shielding materials in Japan

    Page(s): 21 - 30
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (872 KB)  

    Increased usage of thermoplastic materials in electronic apparatus has accentuated electromagnetic interference (EMI) problems. Methods for providing shielding by metallizing the thermoplastics using electroconductive paints and electroconductive thermoplastic molding compounds are examined, following a review of the fundamentals of electromagnetic wave shielding. The characteristics of the commonly used paints and compounds, as well as those of some miscellaneous materials, are discussed. The status of EMI shielding materials in Japan is described.<> View full abstract»

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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.

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Co-Editor-in-Chief
Edward Cherney

Co-Editor-in-Chief
Robert Fleming