IEEE Electrical Insulation Magazine

Issue 4 • July-Aug. 1988

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Displaying Results 1 - 7 of 7
  • Hybrid outdoor insulators

    Publication Year: 1988, Page(s):11 - 15
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (690 KB)

    Attempts to reduce outdoor insulator problems caused by exposure to wetting, weathering, contamination, and vandalism are examined. Three main approaches are discussed: (1) improving the insulator's shape, both to get longer creepage distance and to improve pollution catch and wetting characteristics; (2) changing the nature of the surface so as to defeat contamination and wetting; and (3) reducin... View full abstract»

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  • Utility URD cable experience

    Publication Year: 1988, Page(s):16 - 23
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (871 KB)

    The large numbers of failures of primary underground residential distribution (URD) cables that utilities are experiencing is addressed. The major problems are defined and discussed and methods are suggested whereby the utility cable engineer could best find solutions. The problems and decisions fall into two general categories: those that concern existing in-service cables, and those that concern... View full abstract»

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  • Converting to water-soluble organic varnishes makes environmental, economic, and processing sense

    Publication Year: 1988, Page(s):24 - 28
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (476 KB)

    Types of water-based varnishes and their properties are described. They include inorganic solutions, inorganic dispersions, organic emulsions, organic dispersions, and organic solutions. The performance of these varnishes is examined. The three major types of organic water-soluble resins used as electrical insulating varnishes, namely alkyds, polyesters, and epoxies, are discussed, and guidelines ... View full abstract»

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  • Corona in high voltage rotating machine windings

    Publication Year: 1988, Page(s):29 - 34
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (549 KB)

    An understanding is provided of the phenomena that take place in the windings of turbine generators, water wheel generators, and large motors. The steps that are normally taken by a manufacturer to alleviate this type of electrical aging are reviewed.<> View full abstract»

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  • Fundamentals-corona: insulation's silent enemy. II

    Publication Year: 1988, Page(s):35 - 37
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (434 KB)

    For pt.I see ibid., vol.4, no.3, p.41 (1988). Various methods of testing for the presence of corona are described. The selection of materials on the basis of their resistance to corona is discussed. The problems of designing for corona-free conditions are examined.<> View full abstract»

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  • Technical reports-a new cable phenomenon

    Publication Year: 1988, Page(s):56 - 58
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (335 KB)

    A hitherto unknown phenomenon was discovered while developing a novel type of medium-voltage cable. In an attempt to increase the operation voltage of plastic-insulated belted-type cables, breakdown tests were performed on cables using sandwich insulation, i.e. a dielectric-air-dielectric composite. It was found that if a nonwoven porous tape was applied to the cores, so that the interstices betwe... View full abstract»

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  • Technical reports-NEMA Lab reports on tests for industrial laminates

    Publication Year: 1988
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (188 KB)

    Reports an unexpected result that was obtained when an energy meter was added to the high-current arc tester described in UL746A. Usually, materials are ranked by the number of arcs it takes to ignite them. However, it has been found that the tendency of materials to ignite other nearby material is a function of the maximum arc energy recorded. The author believes that this quantity should be cons... View full abstract»

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Aims & Scope

The EI Magazine publishes articles written by authors from industry, research institutes and academia. The articles are more practical in content than the papers published in the Transactions.

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Meet Our Editors

Co-Editor-in-Chief
Edward Cherney

Co-Editor-in-Chief
Robert Fleming