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Electrical Insulation, IEEE Transactions on

Issue 6 • Date Dec. 1978

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Displaying Results 1 - 18 of 18
  • Table of contents

    Page(s): c1
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  • IEEE Electrical Insulation Society

    Page(s): c2
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  • Mechanical Fatigue Characteristics of High Voltage Generator Insulation

    Page(s): 395 - 402
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    This paper presents the deformation and fracture behavior of stator windings subjected to static and cyclic bending loadings, and the reliability of newly developed insulation systems. The flexural deformation characteristics are revealed on the curved end portion of the stator windings for a 1300 MVA water cooled generator. The fatigue characteristics are examined on the test bars with three different kinds of the developed insulation systems. Comparing those results with calculated thermal strain, it has been confirmed that the insulation systems have sufficient mechanical strength to withstand thermal cycling in service. View full abstract»

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  • Dielectric Properties of Oil-Impregnated all Polypropylene Film, Power Capacitor Insulation System

    Page(s): 403 - 410
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    We have investigated the synthetic oil-impregnated power capacitor insulation system of all polypropylene film dielectrics which is currently used in company products. The results of dielectric measurements in low electric fields can be interpreted by chemical interaction of the polypropylene film with the aromatic synthetic fluid. These investigations' have proved to be quite helpful in the manufacture of power capacitors with superior dielectric properties for service over a wide range of applied voltages. View full abstract»

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  • Corona Onset in a Two-Phase, SF6-TFE Particulate System

    Page(s): 411 - 417
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    A method of computation of corona onset voltage in gas solid dielectric particulate mixtures is presented. Experimental results published in a previous study are correlated with the analytical model. View full abstract»

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  • Tracking and Ignition Phenomena of Polyvinyl Chloride Resin under Wet Polluted Conditions

    Page(s): 418 - 425
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    This paper describes tracking and ignition phenomena of distribution cable and sheet specimens of polyvinyl chloride (PVC) resin on the basis of experimental results obtained by a test method conforming to the IEC tracking test method. Also, the processes of tracking associated with the ignition and combustion of PVC resin are discussed. In the tracking test using two kinds of F-Cables made of PVC resin, depending on the shape of the specimens, F-Cables may be ignited. From the results, it is found that a dry band is apt to form on the specimen and that tracking occurs by an arc across the dry band. The jacket is ignited by the arc under the test condition in which the deteriorated parts are always in contact with the open air. For the sheet specimens made of PVC resin, free carbon deposited by the heat of the scintillations forms a band, and the arc is produced between the carbon band and an electrode when the voltage gradient exceeds 14.2 kV/cm. The arc recurrence frequency is from 3 to 8 s-i just before ignition. The sheet specimens compounded with DOP, TCS, plus other mixtures are apt to produce an arc in comparison with the specimen compounded with only DOP and TCS, and the resistance to tracking and ignition is increased by including paraffin chloride and high melting point paraffin. View full abstract»

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  • Field Behavior near Singular Points in Composite Dielectric Arrangements

    Page(s): 426 - 435
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    At some points on the boundary of two dielectrics, such as at a contact point of the linear boundary with an electrode, the field strength E may change as a function of K.¿m (¿ is the distance from the contact point). The exponent m is negative or positive according to whether the ratio of the two dielectric constants, ¿2/¿1, is greater or less than unity. A negative value of mresults in an infinitely high field strength at the point. In this paper, this field behavior is studied numerically by the charge simulation method and analytically by the variable separation method in both two-dimensional and axially symmetrical arrangements. View full abstract»

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  • Large Capacity Class-H Resin Molded Transformer

    Page(s): 436 - 443
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    The number of dry type transformers for use in buildings and industrial plants has increased in order to meet new safety requirements in Japan which prohibit the use of PCB. Dry type transformers are grouped as conventional dry type Class-H transformers impregnated with silicone varnish, or as resin molded transformers. A new casting resin, which consists of a family of isocyanurate resins, and features good crack and heat resistant properties, has been developed by Hitachi Ltd. Large capacity Class-H resin molded trans-formers are manufactured with this casting resin named MI Resin(R). The salient features of the transformer are its light weight, small size, non-flammability, low noise, and ease of maintenance. View full abstract»

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  • Electrical Performance of Oven-Dried XLPE Cable

    Page(s): 444 - 447
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    Accelerated aging tests conducted on miniature XLPE insulated cable have demonstrated that the oven-drying of steam-cuted XLPE cable insulation at 70°C does not impart any improvement in the initial breakdown voltage or in long-term electrical performance of the insulation over the as-received XLPE samples. Therefore, the oven-drying of steam-cured XLPE cable at 70°C is not considered as an effective method of improving cable quality. View full abstract»

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  • New Electrodes for Partial Discharge Endurance Tests

    Page(s): 448 - 450
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    This communication describes two kinds of electrode systems, newly developed for partial discharge endurance life tests. These methods give much smaller standard deviations than other cavity discharge methods. They are characterized by their open cavity structure in which the gas can remain the same during an experiment. View full abstract»

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  • Author index

    Page(s): 454a - 454c
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  • Subject index

    Page(s): 454c - 454f
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  • An invitation to Membership

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  • Reduce Your Literature-Searching Time by up to 80%

    Page(s): 454h
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  • Editorial policies and criteria

    Page(s): 454-i
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  • Information for authors

    Page(s): 454j
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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