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Electrical Insulation Magazine, IEEE

Issue 5 • Date Sept.-Oct. 1990

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Displaying Results 1 - 5 of 5
  • Solderable wire enamel

    Publication Year: 1990 , Page(s): 8 - 12
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (598 KB)  

    The history of polyurethane coatings in the fine magnet wire industry is documented, focusing on applications. The chemistry of polyurethane is examined, and developments in polyurethane wire technology are reviewed. Suggestions for improving solderability, thermal life, and solubility of the polymer are offered.<> View full abstract»

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  • Stressing insulation in motor repair testing

    Publication Year: 1990 , Page(s): 13 - 19
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (403 KB)  

    The practices of a number of repair shops are reviewed with a view to establishing an index of acceptable workmanship. Also discussed are the effects on the insulation of stresses induced by these operations. Stator insulation tests, stator winding tests, and AC test results are discussed. It is found that factors contributing to the stressing of motor insulation include overly rapid drying and consequent outgassing of moisture, arcing that may occur during AC ground tests, and high starting voltages.<> View full abstract»

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  • Water treeing-a personal saga

    Publication Year: 1990 , Page(s): 20 - 26
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (817 KB)  

    The author outlines work at his laboratory to show one approach to the difficult problem of describing the processes that cause the growth of water trees in cable insulation. Two investigations are described in more detail because they show some of the complications of the topic and the results presented are new. One study involves the development of a short test for resistance to water treeing. In the other, the discharge performance of cables during a breakdown test, is investigated.<> View full abstract»

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  • Breakdown of transformer oil

    Publication Year: 1990 , Page(s): 27 - 34
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (696 KB)  

    Some of the factors affecting the dielectric strength of transformer oil are investigated. These factors include the stabilization phenomenon, oil and electrode pretreatment, the effect of oil velocity, the effect of a capacitance parallel to the test cell, and the effects of electrode area and gap spacing. The experimental apparatus and procedure are described, and the results are presented for each of the above factors. Suggestions for future research are offered.<> View full abstract»

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  • Partial discharge. II. Detection sensitivity

    Publication Year: 1990 , Page(s): 35 - 42
    Cited by:  Papers (28)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1177 KB)  

    For pt.I see ibid., vol.6, no.4, p.33-9 (1990). Options for detecting and characterizing the signal generated by a partial discharge (PD) within a test piece or test configuration are examined. Important parameters considered include minimum detectable signal (PD sensitivity), circuit time constants that limit PD waveform characterization (where this may be desirable), and general applicability of the detection scheme. In general, it is found that detection schemes that are most sensitive tend to be somewhat application specific, whereas detection schemes that are of general applicability tend to sacrifice some sensitivity.<> 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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Meet Our Editors

Co-Editor-in-Chief
Edward Cherney

Co-Editor-in-Chief
Robert Fleming