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IEEE Transactions on Electrical Insulation

Issue 1 • Date Feb. 1977

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Displaying Results 1 - 19 of 19
  • Table of contents

    Publication Year: 1977, Page(s): c1
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    Freely Available from IEEE
  • IEEE Electrical Insulation Group

    Publication Year: 1977, Page(s): c2
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  • Editorial

    Publication Year: 1977, Page(s): 1
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  • Treeing in Solid Extruded Electrical Insulation

    Publication Year: 1977, Page(s):2 - 18
    Cited by:  Papers (118)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5877 KB)

    A survey of the literature on the subject of treeing in solid dielectrics is presented. The purpose is to provide an introduction to the subject, some background for the current research work, and a list of references to some of the more rigorous treatments which in most cases have a narrower scope. The trees which grow in insulating materials can be considered in three classifications; electrical... View full abstract»

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  • DC Treeing Breakdown Associated with Space Charge Formation in Polyethylene

    Publication Year: 1977, Page(s):19 - 25
    Cited by:  Papers (69)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1981 KB)

    It is well known that space charge accumulation has a great influence on both the short-time and long-time breakdown strengths of plastic insulation systems operating under direct voltages. In this paper, dc treeing phenomena initiated from the tip of a needle electrode inserted into a polyethylene specimen have been investigated under various conions. The characteristics of four kinds of trees, d... View full abstract»

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  • Tree Initiation in Polyethylene by Application of DC and Impulse Voltage

    Publication Year: 1977, Page(s):26 - 30
    Cited by:  Papers (30)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1434 KB)

    The results of tree-initiation tests using impulse voltages show that the time required for the build-up of space charge at 25C is 30¿s~80¿s. The results of prestressing tests with DC and superimposing impulse voltages show that the space charges are homo-charges. An investigation of tree-initiation in polyethylene was carried out using dc and impulse voltages, the latter having a wave-front dur... View full abstract»

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  • On the Mechanism of Tree Initiation

    Publication Year: 1977, Page(s):31 - 34
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1585 KB)

    Although the dc-tree-initiation voltage at a needle electrode in a plastic is very high, a tree can be formed by grounding the needle after charging it with a much lower dc voltage than the tree-initiation voltage. The tree formed by grounding will be called "a grounding tree". Since the formation of a tree under ac voltages is considered to be due to the repetition of charging and discharing, som... View full abstract»

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  • Initiation of Internal Discharged in a Liquid-Nitrogen-Filled Cavity

    Publication Year: 1977, Page(s):35 - 39
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (691 KB)

    Discharge initiation phenomena in a liquid-nitrogen-filled cavity were investigated using "ac impulse" i.e., the initial rise of a 50 Hz voltage wareform. It was found that the discharge magnitude in the beginning half cycle of the voltage was either greater, equal, or smaller than that observed in the next half cycle. This phenomenon is discussed in terms of discharge processes and the quantity o... View full abstract»

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  • Treeing of Polyethylene at 77K

    Publication Year: 1977, Page(s):40 - 45
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1927 KB)

    Ac tree starting voltage of low density polyethylene has been found to be higher at liquid nitrogen temperature (42kV) than that at room temperature (7kV) and it is almost equal to the positive impulse tree starting voltage. This improvement may be due to either the partial-discharge free contact of the interface between the needle electrode and the polyethylene and for the moderation of the inten... View full abstract»

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  • AC Dielectric Performance of Helium Impregnated Multi-Layer Plastic Film Insulation

    Publication Year: 1977, Page(s):46 - 50
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (854 KB)

    Several types of thin polymer film insulation are being evaluated for possible use in superconducting underground transmission cables. Measurements are reported on the partial discharge inception voltages of threelayer disc samples of 102-¿m polyethylene and 61-¿m polycarbonate for temperatures and pressures of the helium impregnant ranging from 5.0 K and 0.3 MPa to 11.5 K and 1.5 MPa. Butt gaps... View full abstract»

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  • Measurement of AC Insulation Losses at Cryogenic Temperatures

    Publication Year: 1977, Page(s):51 - 54
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (555 KB)

    The design of superconducting high voltage transmission lines requires engineering data which, until recently, have been largely unavailable. The selection of a suitable dielectric for a tape-insulated ac cryogenic cable, for example, requires the knowledge of insulation dissipation fagtors at high voltage, which are typically 20 x 10 or smaller. We present here dissipation factor measurements mad... View full abstract»

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  • Ageing of Insulatiog Materials and Equipment Insulation in Service and in Tests

    Publication Year: 1977, Page(s):55 - 60
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2000 KB)

    After a discussion of the concepts of ageing of insulations and of the endurance of insulating materials, the importance of verifying the relevance of ageing to insulation failure in equipment is pointed out. Information regarding frequency distributions of service stresses and of the stress dependence of insulation strength is also required. After a discussion of ageing versus changes of property... View full abstract»

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  • Thermal Ageing of Cellulose Paper Insulation

    Publication Year: 1977, Page(s):61 - 66
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (939 KB)

    Results are presented of investigations into the thermal ageing behavior of cellulose paper insulation in which tests have been carried out between 100C and 160C on well-dried samples of cellulose paper contained in sealed glass vessels in an atmosphere of initially dry nitrogen gas. The degree of ageing has been assessed by measuring the time rate of decrease of several physical and physico-chemi... View full abstract»

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  • Application of the Equalized Ageing Process Method on Thermal Endurance Testing of Polyhydantoin Film

    Publication Year: 1977, Page(s):67 - 74
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (878 KB)

    Thermal endurance test results on polyhydantoin film are presented, performed both in the conventional atmospheric conditions and in the conditions fulfilling the requirements for the equalized ageing process. The basic principle of the Equalized Ageing Process method (EAP) for thermal endurance testing of solid electrical insulating materials is to make the ageing process at the test temperature ... View full abstract»

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  • On the use of Polyethylene Insulation in the Manufacture of Submarine Cables

    Publication Year: 1977, Page(s):75 - 79
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (735 KB)

    In the manufacturing process of a submarine coaxial cable, a multitrough water cooling system is used to avoid formation of voids and to strengthen the gripping force between the insulation polyethylene and the metallic center conductor. In submarine coaxial cable systems, the standards for dielectric properties of the insulation, polyethylene, are very strict. The adverse effect of small amounts ... View full abstract»

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  • A 25 Factorial Experiment Investigating the Effects of Operating Conditions on Cable Insulation Life

    Publication Year: 1977, Page(s):80 - 85
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2514 KB)

    The method and interim results of a three-year laboratory investigation are reported on the effects of five in-service environmental factors. These factors include 1) presence or absence of water, 2) ambient air temperature, 4) presence or absence of daily voltage impulses, and 5) presence or absence of currend loading. A 5 kV UniShield R cable was used in the experiment. Through an analysis of va... View full abstract»

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  • On the Behavior of Liquid/Solid Insulations at Very Low Frequency

    Publication Year: 1977, Page(s):86 - 89
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (662 KB)

    The apparent increase of the capacitance of solid/liquid insulations measured at very low frequency under low voltage (~l v), is mainly produced by the appearance of polarization layers (ions are impeded at the interfaces) provided that adequate conditions are fulfilled for the densities and mobilities of ions, and for the frequency and amplitude of the applied voltage. Thus, the insulation behave... View full abstract»

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  • Influence of the Fines on the Dielectric and Tensile Breakdown of Oil-Impregnated Paper

    Publication Year: 1977, Page(s):90 - 96
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4913 KB)

    The ideal composition of fibers for insulating paper has been clarified by investigating the influence of the shape of fines on dielectric and tensile breakdown of oil-impregnated Kraft paper for oil filled (OF) cable at 105N/M oil. Furthermore, the pulp refining methods for producing such insulating paper have been investigated. View full abstract»

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  • Correction

    Publication Year: 1977, Page(s): 96
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Aims & Scope

This Transactions ceased production in 1993. The current retitled publication is  IEEE Transactions on Dielectrics and Electrical Insulation.

Full Aims & Scope