The Influence of Pre-conditioning on Space Charge Formation in LDPE

Mogens Henriksen, Joachim T. Holbøll, R.J. Fleming

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    Abstract

    The effect of thermal conditioning, at reduced pressure, on space charge accumulation in planar LDPE samples under DC stress has been investigated. The samples were 1.8 mm thick, including two 0.1 mm thick semicon electrodes, and they were conditioned prior to voltage application by being held at 80oC for 48 hrs in short-circuit at rotary pump pressure. Some were then cooled to 20oC, over a 6 hr period, still under rotary pump pressure and in short circuit, while others were cooled to 20oC in less than 5 minutes, in the laboratory air (still in short circuit). DC fields of 20 kV/mm were then applied at room temperature, and space charge accumulation was monitored as a function of time, using the pulsed-electro-acoustic (PEA) method (Denmark) and the laser-induced-pressure-pulse (LIPP) method (Australia). The space charge density was calibrated from measurements at fields up to 5 kV/mm, where charge injection from the electrodes or field-assisted thermal ionisation of impurities would not be expected.
    Original languageEnglish
    Title of host publicationSpace Charge in Solid Dielectrics
    Place of PublicationLeicester, UK
    PublisherThe Dielectrics Society
    Publication date1998
    Publication statusPublished - 1998
    EventDielectrics Society 28th Meeting - Space Charge in Solid Dielectrics - Canterbury, UK
    Duration: 1 Jan 1997 → …

    Conference

    ConferenceDielectrics Society 28th Meeting - Space Charge in Solid Dielectrics
    CityCanterbury, UK
    Period01/01/1997 → …

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