IEEE Electrical Insulation Magazine

Issue 3 • May-June 1992

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Displaying Results 1 - 4 of 4
  • Estimation of lifetime expectancies of motors

    Publication Year: 1992, Page(s):5 - 13
    Cited by:  Papers (37)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (792 KB)

    Methods for evaluating lifetime expectations are discussed. Factors that affect the life of bearings and brushes and of wire coil insulation are identified. Thermal life of insulation and methods for accelerated testing are discussed. Examples are included to assist in the calculation of such factors as motor temperature-rise conditions and the benefits to be realized through upgrading the thermal... View full abstract»

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  • Electrical insulation in superconducting power systems

    Publication Year: 1992, Page(s):14 - 20
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (697 KB)

    The use of vacuum, gaseous He, and solid and liquid He as insulators is discussed. Degradation effects for each of these are examined. Practical insulation systems are considered. Factors to consider in their design are identified.<> View full abstract»

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  • Partial discharges. XII. Partial discharge detection in rotating electrical machines

    Publication Year: 1992, Page(s):21 - 32
    Cited by:  Papers (29)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1130 KB)

    For pt.XI see ibid., vol.8, no.2, p.14 et seq. (1992). Partial discharge (PD) phenomena in the windings of rotating machines are examined. PD measurements on rotating machines, both offline and online, are described. Data acquisition and analysis requirements are briefly considered.<> View full abstract»

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  • Cable insulation density profile determined from ultrasonic velocity measurements

    Publication Year: 1992, Page(s):33 - 36
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (382 KB)

    Density results obtained on the same cable sample with a column and from ultrasonic measurements are reported. A calibration curve relating ultrasonic velocity and cable insulation density is given for PE and crosslinked PE (XLPE) cables. The limits and advantages of deducing density profiles of cable insulation using a focused, ultrasound beam rather than the more time-consuming column measuremen... View full abstract»

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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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Edward Cherney

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Robert Fleming