Power frequency interference and suppression in measurement of power transmission tower grounding resistance

Zhou Wenjun, Liu Yushun, Gongxin Li, Guozhi Yan, Shuai Yang, Han Li, Chengke Zhou, Charles Qi Su

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    Abstract

    Due to the electromagnetic induction between transmission
    lines and the associated grounding wires, power frequency
    current causes flow into the ground network via the metallic tower,
    which may interfere with grounding resistance measurements.
    This paper analyzes the mechanisms of this interference, and
    shows that power frequency interference becomes stronger at
    phase-wire transposition towers. Grounding resistance measurement
    by the variable frequency (VF) method has been proven to be
    effective in dealing with power frequency interference. However,
    the test equipment based on the VF method is always deactivated
    when the external interference voltage exceeds a preset level
    in order to avoid false readings. This paper aims at tackling
    the problem by introducing a reverse phase cancellation (RPC)
    method, which acquires and processes the interference signal
    before generating a cancelling signal with the same amplitude
    and frequency and a phase which is exactly opposite in polarity.
    This paper proves that the RPC method represents an excellent
    improvement over the VF method since it retains the advantages
    of VF and avoids the trip-out of test equipment due to excessive
    interference.
    Original languageEnglish
    Pages (from-to)1016-1023
    Number of pages8
    JournalIEEE Transactions on Power Delivery
    Volume30
    Issue number2
    DOIs
    Publication statusPublished - 25 Nov 2014

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    Keywords

    • grounding resistance measurement
    • power frequency interference
    • transmission tower

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