Fault location and diagnosis in medium voltage shielded power cable

Alistair Reid, Chengke Zhou, Donald Hepburn, Martin D. Judd, Wah Hoon Siew, Philip Withers

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    Abstract

    This paper presents a case study on fault location, characterization and diagnosis in a length of shielded 11 kV medium voltage ethylene-propylene rubber (EPR) power cable. The defect was identified on-site as a low resistance fault occurring between the sheath and the core. A 43 m section was removed for further analysis. The fault resistance was characterized and the location of the defect pinpointed to within a few cm using a combination of time-difference-of-arrival location and infra-red imaging. A combination of X-ray computed tomography, scanning electron microscopy and energy dispersive X-ray spectroscopy were then applied to characterize any abnormalities in the dielectric surrounding the breakdown region.
    Original languageEnglish
    Pages (from-to)10-18
    Number of pages9
    JournalIEEE Transactions on Dielectrics and Electrical Insulation
    Volume20
    Issue number1
    DOIs
    Publication statusPublished - Feb 2012

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    Keywords

    • condition monitoring
    • power system faults
    • dielectric breakdown
    • power cable insulation
    • X-ray imaging

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