Modelling of dry-band discharge events on insulation surfaces

Xin Zhang, Simon M. Rowland

    Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

    Abstract

    Discharges on composite insulator insulation surfaces are one cause of long-term ageing. Consequences of such ageing are further acceleration of damage, and ultimately an increased likelihood of flashover. Normally it is an unacceptable flashover probability that requires maintenance or replacement of aged insulators. In some cases however, the surface discharges can lead to deep erosion which can then lead to of the surface being penetrated. This can result in moisture penetration into the core and internal tracking and permanent insulator failure. For these reasons modelling of discharge activity is important to understanding ageing processes. Here we show that the dynamic behaviour of moisture on the surface of an insulator is critical to its ageing. Circumstances are identified in which very rapid ageing can take place. The thermal properties of arcs are also shown to be non-linear. Experimental evidence from testing in salt fog chambers is presented and used to quantify the description of energy available for the degradation process. Using these experimental results, arc power and energy are analyzed as functions of arcing length. Causes for unusual heating of the polymer substrate, which ultimately damages the insulation material more rapidly than otherwise expected, are also identified. © 2010 IEEE.
    Original languageEnglish
    Title of host publicationConference Record of IEEE International Symposium on Electrical Insulation|Conf Rec IEEE Int Symp Electr Insul
    DOIs
    Publication statusPublished - 2010
    Event2010 IEEE International Symposium on Electrical Insulation, ISEI 2010 - San Diego, CA
    Duration: 1 Jul 2010 → …

    Conference

    Conference2010 IEEE International Symposium on Electrical Insulation, ISEI 2010
    CitySan Diego, CA
    Period1/07/10 → …

    Keywords

    • Arc compression
    • Arc current
    • Arc power
    • Arc voltage
    • Double sinusoidal model
    • Dryband arc
    • Energy radiation
    • Triple cylinder model

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