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IEEE Transactions on Dielectrics and Electrical Insulation

Issue 5 • Date Oct 1999

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Displaying Results 1 - 21 of 21
  • Outdoor HV composite polymeric insulators

    Publication Year: 1999, Page(s):557 - 585
    Cited by:  Papers (192)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2024 KB)

    HV composite polymeric insulators are being accepted increasingly for use in outdoor installations by the traditionally cautious electric power utilities worldwide. They currently represent ~60 to 70% of newly installed HV insulators in North America. The tremendous growth in the applications of non-ceramic composite insulators is due to their advantages over the traditional ceramic and glass insu... View full abstract»

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  • Survey on the use of non-ceramic composite insulators

    Publication Year: 1999, Page(s):548 - 556
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    This paper summarizes the result of the questionnaire on current status of non-ceramic (composite) insulators in the world conducted by the Non-ceramic (composite) Insulators Technical Committee, Japan. Current use status, reasons for use, maintenance, failure occurrence and research activity of 16 responding utilities are described. About 80% of the responding utilities answered that they would a... View full abstract»

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  • Hydrophobicity loss and recovery of silicone HV insulation

    Publication Year: 1999, Page(s):695 - 702
    Cited by:  Papers (40)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    Most of the silicone materials used for HV outdoor insulation are high-consistency, heat cured polydimethylsiloxane (PDMS) elastomers. The unique properties of PDMS that make it suitable for HV applications are reviewed. The surface of these elastomers can be rendered hydrophilic by exposure to discharges. A time and temperature dependent hydrophobic recovery ensues when exposure ceases. A variety... View full abstract»

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  • Test methods for polymeric insulating materials for outdoor HV insulation

    Publication Year: 1999, Page(s):668 - 675
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    The paper describes an analysis of standardized and non-standardized test methods for polymeric insulating materials, either suitable or applied for, outdoor HV insulation. The analysis particularly considers the increasing use of silicone elastomers for composite insulators. In the first part, test methods covering erosion/tracking performance and hydrolysis phenomena are discussed. These are inc... View full abstract»

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  • Loss and recovery of hydrophobicity, surface energies, diffusion coefficients and activation energy of nylon

    Publication Year: 1999, Page(s):754 - 762
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    The loss of hydrophobicity of nylon 6/6 caused by immersion in saline water for up to 336 h at different conductivities (0.005 to 100 mS/cm) and different temperatures (0 to 98°C) and its subsequent recovery in air (during 4500 h) have been investigated. The hydrophobicity is determined by measuring the static contact angle θ between the tangent to a droplet of distilled water and the ho... View full abstract»

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  • Electrical and environmental aging of silicone rubber used in outdoor insulation

    Publication Year: 1999, Page(s):632 - 650
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1172 KB)

    This is a laboratory study on the aging of SIR and hydrophobicity recovery. UV radiation, corona discharges, acid rain and dry-band arcing are employed as sources of the aging. Chemical and morphological analysis is used to detect the surface chemical and structural changes derived from these stresses. The nature of highly mobile low molecular weight (LMW) chains achieving a quick recovery of the ... View full abstract»

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  • Applications of polymeric outdoor insulation in Japan

    Publication Year: 1999, Page(s):595 - 604
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (832 KB)

    Intensive research and development concerning the application of polymeric outdoor insulations in Japan started about 10 years ago. Research on applying polymeric insulating materials to power systems covers various fields such as insulators and interphase spacers for overhead transmission lines, polymer housing of bushing and surge arresters for substation apparatus, insulators and interphase spa... View full abstract»

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  • Acoustic and optical methods for measuring electric charge distributions in dielectrics

    Publication Year: 1999, Page(s):519 - 547
    Cited by:  Papers (90)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2016 KB)

    Much progress had been made during the last two decades in acoustic and optical methods for measuring charge distributions in dielectrics. A review on this topic is given, which mainly covers the past research activities associated with that at our laboratory. For acoustic methods, we will discuss and compare the pulsed electroacoustic (PEA) and pressure wave propagation (PWP) methods and present ... View full abstract»

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  • Leakage current patterns on contaminated polymeric surfaces

    Publication Year: 1999, Page(s):688 - 694
    Cited by:  Papers (48)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    This paper presents measurements of low-level leakage current (LC) patterns on naturally aged insulators and artificially contaminated material samples as well as insulators. A nonlinear behavior of the LC has been observed. Possible causes for this behavior are discussed and its relations to surface hydrophobicity and electric stress are described. In addition, neural networks are trained to reco... View full abstract»

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  • Leakage currents on non-ceramic insulators and materials

    Publication Year: 1999, Page(s):660 - 667
    Cited by:  Papers (32)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (672 KB)

    This paper presents a review of leakage current (LC) measurements on nonceramic insulators and material samples. It is divided into two parts: First, the field investigations of LC, include a development of LC measuring systems and how the on-line LC measurements correlate to the insulator performance as well as to the atmospheric and pollution parameters. Then, the laboratory investigations, desc... View full abstract»

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  • Leakage current and flashover of field-aged polymeric insulators

    Publication Year: 1999, Page(s):744 - 753
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (756 KB)

    In this paper results from leakage current (LC) measurements under steam fog and voltage withstand tests under rain conditions obtained on various field aged polymeric insulators are reported. Included in this work are several silicone rubber (SIR) and ethylene propylene diene monomer (EPDM) rubber insulators of ac and dc design that have been energized at suitably high ac and dc voltages under co... View full abstract»

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  • Formation and characterization of dry bands in clean fog on polluted insulators

    Publication Year: 1999, Page(s):724 - 731
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    The formation and development of dry bands can best be studied by modifying the standard test procedures. When such controlled behavior is allied with synchronized optical and electrical recordings, then characterization of the pre-formative leakage current, the transient phenomena associated with partial arcs across dry bands, the location of partial arcs and the voltage drop across dry bands can... View full abstract»

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  • Review of aging and recovery of silicone rubber insulation for outdoor use

    Publication Year: 1999, Page(s):620 - 631
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (908 KB)

    This paper surveys the properties which give silicone rubber its distinctive and highly desirable performance characteristics for use as outdoor insulation. The methods of assessing these properties are discussed and this is followed by a detailed survey of what is known of aging and recovery mechanisms. Corona is identified as the principle electrical aging agent and evidence is presented for irr... View full abstract»

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  • Development of composite insulators in China

    Publication Year: 1999, Page(s):586 - 594
    Cited by:  Papers (68)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (676 KB)

    The development of composite insulators in China dates back to the early 1970's. In the 1990's they have become widely used in China. At present, up to 600000 composite insulators are operating on 35 to 500 kV ac overhead transmission lines. They are to be introduced into the ±500 kV HVDC transmission schemes. In China all composite insulators in service are silicone rubber and are operatin... View full abstract»

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  • Hydrophobicity changes in silicone rubbers

    Publication Year: 1999, Page(s):703 - 717
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1096 KB)

    Water repellency, high surface resistivity, vandalism resistance, low density and good processability have made silicone rubbers based on polydimethylsiloxane (PDMS) very attractive materials in housings for outdoor insulation. Their ability to recover hydrophobicity after oxidation or contamination is of paramount importance and this is the topic of this review. A critical evaluation of the chemi... View full abstract»

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  • Utilization of fog chambers for non-ceramic outdoor insulator evaluation

    Publication Year: 1999, Page(s):676 - 687
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (944 KB)

    Non-ceramic (polymer, composite) insulators consist of a fiberglass core rod, weathershed housing, and metal end fittings. The housings generally are manufactured from polymeric materials. In service, the weathershed materials may be subject to degradation or aging due to harsh environmental conditions. One of the most commonly used laboratory tests to evaluate the performance of the weathershed m... View full abstract»

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  • Interfacial phenomena in composite high voltage insulation

    Publication Year: 1999, Page(s):651 - 659
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    This paper deals with two different types of composite insulating materials for HV outdoor insulation technology. For outdoor applications fiberglass reinforced polymer (FRP) is used mainly in transmission line insulators (composite long rods), and as power apparatus housings (composite hollow core insulators). During the last decade mineral filled polymer (MFP) was found to be very suitable for o... View full abstract»

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  • RTV silicone rubber coatings for outdoor insulators

    Publication Year: 1999, Page(s):605 - 611
    Cited by:  Papers (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    The paper presents a review of room temperature vulcanized (RTV) silicone rubber high voltage insulator coatings (HVIC). These coatings are designed to replace greasing and water washing of insulators. Present day coatings are the result of nearly thirty years of development and use. In all but a very few dirty environments, these coatings have lasted ten or more years without maintenance and wher... View full abstract»

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  • Test methods and results for recent outdoor insulation in Japan

    Publication Year: 1999, Page(s):732 - 743
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (664 KB)

    This paper describes new test methods and some typical test results for a recently developed external insulation in Japan. The paper starts with the introduction of the results of the tests that were conducted specially on the external insulation for 1100 kV/10 GW ac transmission line and ±500 kV/2.8 GW dc overhead line section, recently constructed in Japan using heavy duty insulators and ... View full abstract»

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  • Flashover mechanism of non-ceramic insulators

    Publication Year: 1999, Page(s):718 - 723
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    The contamination performance of non-ceramic (NC) insulators is better than porcelain insulators. The paper describes the pollution collection mechanism and concludes that silicone rubber insulators collect more pollution than porcelain insulators. Long term exposure of silicone rubber insulators produces a thin layer of pollution, which is a mixture of dust, salt and silicone oil. Fog or morning ... View full abstract»

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  • Monitoring the condition of insulator shed materials in overhead distribution networks

    Publication Year: 1999, Page(s):612 - 619
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (608 KB)

    Methods of sampling and analyzing the surface material of sheds of composite insulators are reviewed. It is shown that scanning electron microscopy gives useful information from slivers cut from the insulator surfaces, and emission Fourier transform infrared (FTIR) spectroscopy enables derivation of indicators of material oxidation to be developed from surface swabbing with solvents. FTIR absorpti... View full abstract»

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Aims & Scope

IEEE Transactions on Dielectrics and Electrical Insulation contains topics that are concerned with dielectric phenomena and measurements, with development and characterization of gaseous, vacuum, liquid and solid electrical insulating materials and systems; and with utilization of these materials in circuits and systems under condition of use. 

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Editor-in-Chief
Reuben Hackam