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Electrical Insulation Magazine, IEEE

Issue 3 • Date May-June 1993

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  • Performance characteristics of XLPE versus EPR as insulation for high voltage cables

    Publication Year: 1993 , Page(s): 8 - 12
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (391 KB)  

    The physical and electrical properties of crosslinked polyethylene (XLPE) and ethylene propylene rubber (EPR) are compared in the context of their use in transmission class cables. Results indicate that the 138-kV XLPE cable has AC withstand/breakdown strength at least 25% higher than the 150-kV EPR cable. The XLPE cable exhibits about 70% higher impulse strength than the EPR cable. The loss factor of the XLPE cable is at least 20 times lower than that of EPR cable. Thus with XLPE cables, the yearly energy savings can be on the order of 15 MWh/cct. km for a 69-kV system, 52 MWh/cct. km for a 138-kV system and 127 MHh/cct. km for a 230-kV system.<> View full abstract»

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  • Progress of insulation ageing and diagnostics of high voltage rotating machine windings in Japan

    Publication Year: 1993 , Page(s): 13 - 20
    Cited by:  Papers (15)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (728 KB)  

    Recent research into using offline and online diagnostics to study ageing of generator insulation is discussed. Preventive maintenance based on offline diagnostic methods and adequate updating of windings are reviewed. A few examples of online partial discharge measurements and sensor designs of and concepts under development by several manufacturers are presented.<> View full abstract»

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  • Partial discharge. XVI. Ultrasonic sensing of PD within large capacitors

    Publication Year: 1993 , Page(s): 21 - 28
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    For pt.XV see ibid., vol.8, no.6, p.37 et seq. (1993). High-voltage capacitor technology is reviewed, and the characteristics of partial discharges (PDs) in these capacitors, the PD's ultrasonic signatures, and the effects of acoustic attenuation within capacitor windings are discussed. This discussion forms the basis for an analysis of ultrasonic instrument design as related to PD detection in capacitors. The calibration and verification of proper operation required of all PD measuring systems are described. Some data from acoustic PD measurements of field-installed capacitors are presented.<> View full abstract»

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  • Investigation of S/sub 2/F/sub 10/ production and mitigation in compressed SF/sub 6/-insulated power systems

    Publication Year: 1993 , Page(s): 29 - 40
    Cited by:  Papers (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1497 KB)  

    The Cooperative Research and Development Agreement (CRADA), established to study the production and mitigation of S/sub 2/F/sub 10/ (disulfur decafluoride), one of a number of toxic by-products formed in electric discharges in the insulating gas SF/sub 6/, is described. The particular concern about S/sub 2/F/sub 10/ is due to its highly toxic nature, the ceiling limit value being 10 parts per billion (ppb, or 1 part in 10/sup 8/), and the need for development of sensitive detection techniques down to this level. In the presence of an electrical discharge such as an arc, spark, or corona, a portion of the SF/sub 6/ decomposes into lower fluorides of sulphur which can react to form a number of chemically active by-products including SOF/sub 2/ and SO/sub 2/F/sub 2/. During the maintenance or repair of SF/sub 6/-insulated equipment, the handling of these gaseous is a matter of concern. Preliminary arc experiment results, reported health-related incidents caused by SF/sub 6/ by-products, and ongoing studies are discussed.<> 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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Edward Cherney

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Robert Fleming