Influence of interphase interference on resistive leakage current of MOA

The latent faults of the metal oxide surge arrester (MOA) can be found by on-line resistive leakage current monitoring. However, because of the influence of location and distributing mode of the MOA, the voltage of two other phases affect a single MOA by interphase interference, and this influences...

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Bibliographic Details
Main Authors: Yongqiang Wanq, Fangcheng Lu, Heming Li
Format: Conference Proceeding
Language:English
Subjects:
Aging
Arresters
Computerized monitoring
Interference
Leakage current
Power system protection
Substation protection
Surge protection
Testing
Voltage control
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Summary:The latent faults of the metal oxide surge arrester (MOA) can be found by on-line resistive leakage current monitoring. However, because of the influence of location and distributing mode of the MOA, the voltage of two other phases affect a single MOA by interphase interference, and this influences the monitoring accuracy of the MOA's resistive leakage current. A software analysis method for every phase influential factor is advanced. And we analyze the double CT method to eliminate this influence. Based on the double CT method, a bus-module on-line leakage current monitoring system for the MOA is developed.
DOI:10.1109/ICCEA.2004.1459342