Li, Gongxin

Li, Han

Su, Charles Qi

Wenjun, Zhou

Yan, Guozhi

Yang, Shuai

Yushun, Liu

Zhou, Chengke

English

Due to the electromagnetic induction between transmissionlines and the associated grounding wires, power frequencycurrent 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, andshows that power frequency interference becomes stronger atphase-wire transposition towers. Grounding resistance measurementby the variable frequency (VF) method has been proven to beeffective in dealing with power frequency interference. However,the test equipment based on the VF method is always deactivatedwhen the external interference voltage exceeds a preset levelin order to avoid false readings. This paper aims at tacklingthe problem by introducing a reverse phase cancellation (RPC)method, which acquires and processes the interference signalbefore generating a cancelling signal with the same amplitudeand frequency and a phase which is exactly opposite in polarity.This paper proves that the RPC method represents an excellentimprovement over the VF method since it retains the advantagesof VF and avoids the trip-out of test equipment due to excessiveinterference

ResearchOnline@GCU

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

https://researchonline.gcu.ac.uk/files/6078380/IEEE_April_2015_ground_resistance_measurement_and_power_frequency_interference.pdf

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

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ResearchOnline@GCU