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Electrical Insulation, IEEE Transactions on

Issue 1 • Date Feb. 1981

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  • Table of contents

    Publication Year: 1981 , Page(s): c1
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  • IEEE Electrical Insulation Society

    Publication Year: 1981 , Page(s): c2
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  • Theory of Equalization of Thermal Ageing Processes of Electrical Insulating Materialsin Thermal Endurance Tests I: Review of Theoretical Basis of Test Methods and Chemical and Physical Aspects of Ageing

    Publication Year: 1981 , Page(s): 1 - 6
    Cited by:  Papers (18)
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  • Theory of Equalization of Thermal Ageing Processes of Electrical Insulating Materials in Thermal Endurance Tests II: The Theory with Practical Approximations and Application Principles

    Publication Year: 1981 , Page(s): 7 - 17
    Cited by:  Papers (5)
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    An exact formulation is given of the theory of equalized ageing processes (EAP). It is shown in a very general form that the true thermal ageing process of a material proceeding at service conditions can be accurately reproduced only if all the relevant chemical and physical ageing reactions can be equally accelerated. For practical thermal endurance testing, suitable approximations are presented. Various ways in which behavior may deviate from the EAP principles are described and discussed. The practical EAP test method is divided in two parts: Firstly, reaction rate measurements where rates of all important ageing reactions are measured as a function of temperature and appropriate gas concentrations. Secondly, physicai ageing tests where deterioration of important properties like elongation and flexural strength are measured as a function of time, choosing gas concentrations in ageing test chambers such that all the important ageing reactions are identically accelerated. Results of such tests can be readily converted to describe the ageing behavior of the material at a lower temperature. View full abstract»

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  • Theory of Equalization of Thermal Ageing Processes of Electrical Insulating Materials in Thermal Endurance Teste III. Tests Results on an Enamelled Wire, a Polyester Glass Laminate and an Epoxy Casting Resin

    Publication Year: 1981 , Page(s): 18 - 30
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    Comparative test results are presented on polyesterimide coated copper wires, a polyester glass mat laminate and a heterocyclic epoxy resin. Tests have been performed according to the application principles of the EAP theory, described in Paper II of this series. Results of tests show that the ageing behavior of these materials is well predictable on the basis of EAP tests, and in every case better than the prediction based on conventional test results, whenever a reliable comparison could be made. With the exception of one insignificant deviation, all the materials behaved according to the EAP principles developed in the theoretical Paper II of this series. The results described here and those published earlier can be taken as the proof of reliability of the EAP method for the thermal endurance testing of electrical insulating materials. View full abstract»

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  • Dynamic Deformation and Strength of Stator end Windings During Sudden Short Circuits

    Publication Year: 1981 , Page(s): 31 - 39
    Cited by:  Papers (3)
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    A strain measurement technique was developed in order to reduce the disturbance caused by the electromagnetic field. Using this technique, a series of short circuit tests were carried out on a 21000 kVA two-pole turbine generator. The strain and displacement induced on the stator end windings were measured under various short circuit voltages. The mechanical strength of stator windings against a sudden short circuit is discussed in relation to the variations in tan6 and breakdown voltage characteristics, and is also discussed in comparison with the measured strains induced on the stator end windings and the ultimate strains obtained by the tensile and bending tests on test bars. View full abstract»

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  • Some Characteristics of Dielectric Materials at Cryogenic Temperatures for HVDC Systems

    Publication Year: 1981 , Page(s): 40 - 51
    Cited by:  Papers (3)
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    This dielectric study was performed as part of the dc Superconducting Power Transmission Line Program. During a screening test program, the dc breakdown strength of 12 dielectric materials, in sheet form, was determined at 12 K under 1.38 MPa of helium pressure, the operating conditions of the cable design. Tests were also made with four of these materials impregnated with mineral oil. Further dc breakdown tests were performed on five of these dielectric materials at various temperatures (12 to 298 K) and pressures (0.69 and 1.38 MPa) of helium. Two sets of experiments were performed on cellulose paper impregnated with distilled water at 83 K and 1.38 MPa of helium pressure. Five dielectric materials were then selected for tests as cable samples with dc and impulse voltages at 12 K and 1.38 MPa of helium. Data are presented on these tests, as well as on those of the electrical conductivity of four dielectric materials at cryogenic temperatures, and of the surface flashover strength of an epoxy bushing at 12 K and 298 K under 0.69 MPa and 1.38 MPa of helium pressures. The characteristics of the dielectric behavior at cryogenic temperatures are discussed. Impregnation of cellulose and copaco papers and PP/C with mineral oil improved their dc withstand strengths significantly, even at cryogenic temperatures. The dc breakdown field (uniform field con figuration) of cellulose and copaco papers (with and without oil impregnation) and PP/C varied as the exponential of the inverse of temperature. View full abstract»

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  • Electrical Breakdown Due to Discharges in Different Types of Insulation

    Publication Year: 1981 , Page(s): 52 - 58
    Cited by:  Papers (5)
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    By comparing the propagation of electrical trees in polyethylene with the evolution of artificial air-filled cavities in epoxy, it is possible to envisage the dielectric breakdown as a treeing process. Experiments were carried out on epoxy resin specimens with voids of 0.250 mm thick and 3 mm in diameter. The propagation of electrical trees was studied in low density polyethylene in which a needle was inserted, a metallic plane in close contact with the polymer being the grounded electrode. For a cavity, the delocalization of discharges was observed by recording the corresponding pulses against time and was confirmed by optical observations. On the other hand, the study of the partial discharge characteristics of electrical trees has shown the existence of several distinct phases. They give a good idea of the nature and the localization of trees. To take into account the decentralization of the discharges, the classic equivalent circuit of a cavity has been modified. The model explains the behavior of the discharge number but does not take into account the permanent change in the dimensions and the electrical characteristics of the medium, particularly in the case of treeing. View full abstract»

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  • A Theory of Non-Steady State Moisture Absorption by Annular Polymeric Dielectrics

    Publication Year: 1981 , Page(s): 59
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  • Meetings

    Publication Year: 1981 , Page(s): 60
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  • How 600 Libraries in 38 Countries Help Keep Their Readers Abreast of Electrotechnology.

    Publication Year: 1981 , Page(s): 60-a
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  • IEEE Eletrial Insulation Society

    Publication Year: 1981 , Page(s): 60-b
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  • IEEE copyright form

    Publication Year: 1981 , Page(s): 60-c - 60-d
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  • IEEE Electrical Insulation Society

    Publication Year: 1981 , Page(s): 60-e
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  • Information for authors

    Publication Year: 1981 , Page(s): 60f
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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