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IEEE Electrical Insulation Magazine

Issue 6 • Nov.-Dec. 1989

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  • Sulphur hexafluoride-A complex dielectric

    Publication Year: 1989, Page(s):16 - 21
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (649 KB)

    Some of the factors that must be taken into account in designing with SF/sub 6/ are discussed. These factors include the effect of field inhomogeneities on the electrode which reduce the dielectric strength in SF/sub 6/ and the effect of SF/sub 6/ decomposition byproducts on the materials used in SF/sub 6/-insulated systems. Homogeneous and inhomogeneous field breakdown are discussed, and typical ... View full abstract»

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  • Dissolved gas analysis: It can save your transformer

    Publication Year: 1989, Page(s):22 - 27
    Cited by:  Papers (132)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (935 KB)

    The use of dissolved gas analysis (DGA) to monitor the in-service behavior of transformers is discussed. Sampling techniques are briefly considered, and two commercial hydrogen-in-oil detectors are described. The first allows the hydrogen concentration to be measured at intervals of a few hours by a portable gas collector that can be connected to semipermeable tubes. Continuous remote monitoring f... View full abstract»

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  • Zinc oxide varistors

    Publication Year: 1989, Page(s):28 - 30
    Cited by:  Papers (114)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1114 KB)

    An overview is given of zinc oxide varistors, which are made of semiconducting ceramics with highly nonohmic current-voltage characteristics, which originate at the grain boundaries. These varistors are widely utilized to protect electric power lines and electronic components against dangerous voltage surges. This overview covers electrical characteristics, fabrication methods, effects of additive... 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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