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

doi:10.1109/TPWRD.2014.2370037

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

Research output: Contribution to journal › Article

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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 language	English
Pages (from-to)	1016-1023
Number of pages	8
Journal	IEEE Transactions on Power Delivery
Volume	30
Issue number	2
DOIs	https://doi.org/10.1109/TPWRD.2014.2370037
Publication status	Published - 25 Nov 2014

Keywords

grounding resistance measurement
power frequency interference
transmission tower

Documents and Links

10.1109/TPWRD.2014.2370037

Zhou, W. et al (2015) Power frequency interference and suppression in measurement of power transmission tower grounding resistance
This is the accepted author manuscript of an article published in IEEE Transactions on Power Delivery by IEEE. Available at http://ieeexplore.ieee.org/abstract/document/6966758/?section=abstract Copyright: 2015 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works
Accepted author manuscript, 2.04 MB

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title = "Power frequency interference and suppression in measurement of power transmission tower grounding resistance",

abstract = "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.",

keywords = "grounding resistance measurement, power frequency interference, transmission tower",

author = "Zhou Wenjun and Liu Yushun and Gongxin Li and Guozhi Yan and Shuai Yang and Han Li and Chengke Zhou and Su, {Charles Qi}",

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T1 - Power frequency interference and suppression in measurement of power transmission tower grounding resistance

AU - Wenjun, Zhou

AU - Yushun, Liu

AU - Li, Gongxin

AU - Yan, Guozhi

AU - Yang, Shuai

AU - Li, Han

AU - Zhou, Chengke

AU - Su, Charles Qi

PY - 2014/11/25

Y1 - 2014/11/25

N2 - 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.

AB - 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.

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KW - power frequency interference

KW - transmission tower

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DO - 10.1109/TPWRD.2014.2370037

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