On-line partial discharge testing of in-service rotating machines in ex hazardous environments by employment of central monitoring solutions

Lee Renforth, Steven Goodfellow, Marc Foxall, David Clark, Roger Shuttleworth

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

    Abstract

    Carrying out the on-line partial discharge (OLPD) testing of in-service high voltage (HV) rotating machines can be an effective technique to understand any insulation degradation mechanisms that may be present within the stator windings. Interpretation of OLPD measurements performed on rotating machines can be difficult due to the presence of noise and interference from variable speed drives (VSD's) and/or motor exciter systems. The new PD measurement and monitoring techniques outlined in this paper are carried out at the switchgear-end of the machine's feeder cable, at distances of up to 2km from the machine under test. It has been shown that this remote monitoring technique eliminates much of this high-frequency interference which can be seen at the machines' terminal box. This is due to the effect of the high voltage power cable between the switchgear and the machine, with the cable acting as a low-pass filter, stripping out higher frequency signals whilst retaining lower frequencies. Also, most importantly for operators with motors located within Ex hazardous gas zones such as in the oil & gas industry, the remote monitoring technique allows these motors to be monitored without the need to enter the Ex zone to install sensors or monitors. The authors present case studies from two oil & gas companies showing how the technique has been used for monitoring PD of in-service motors located in Ex zones. © 2012 IEEE.
    Original languageEnglish
    Title of host publicationConference Record of IEEE International Symposium on Electrical Insulation|Conf Rec IEEE Int Symp Electr Insul
    PublisherIEEE
    Pages565-570
    Number of pages5
    ISBN (Print)9781467304887
    DOIs
    Publication statusPublished - 2012
    Event2012 19th IEEE International Symposium on Electrical Insulation, ISEI 2012 - San Juan, PR
    Duration: 1 Jul 2012 → …

    Conference

    Conference2012 19th IEEE International Symposium on Electrical Insulation, ISEI 2012
    CitySan Juan, PR
    Period1/07/12 → …

    Keywords

    • Ex Motor
    • Hazardous Gas Zone
    • On-Line PD Testing
    • Rotating Machine
    • Wideband

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