On-line PD detection and localisation in cross-bonded HV cable systems

Bojie Sheng, Wenjun Zhou, Jianhui Yu, Shaoxin Meng, Chengke Zhou, Donald M. Hepburn

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    Abstract

    This paper addresses the detection and localization of partial discharge (PD) in cross-bonded (CB) high voltage (HV) cables. A great deal has been published in recent years on PD based cable insulation condition monitoring, diagnostics and localisation in medium voltage (MV) and high voltage (HV) cables. The topic of pulse propagation and PD source localization in CB HV cable systems has yet to be significantly investigated. The main challenge to PD monitoring of CB HV cables is as a result of the interconnectedness of the sheaths of the three single phase cables. The cross-bonding of the sheaths makes it difficult to localise which of the three phases a PD signal has emanated from. Co-axial cables are used to connect cable sheaths to cable link boxes, for ease of installation and protection against moisture. A second challenge is, therefore, the coupling effect when a PD pulse propagates in HV cable joints and the co-axial cables, making PD detection and localisation more complex. The paper presents experimental investigations into PD pulse coupling between the cable centre conductor and the sheath and the behavior of PD pulse propagation in CB HV cables. It proposes a model to describe PD pulse propagation in a CB HV cable system to allow monitoring and localization, and also presents the knowledge rules required for PD localization in CB HV cable systems.
    Original languageEnglish
    Pages (from-to)2217-2224
    Number of pages8
    JournalIEEE Transactions on Dielectrics and Electrical Insulation
    Volume21
    Issue number5
    DOIs
    Publication statusPublished - 23 Oct 2014

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    Keywords

    • partial discharge
    • PD localisation
    • cross bonded cable
    • cable
    • on-line insulation condition monitoring
    • coupling effect

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