Study on Fault Decomposition Properties and Fault Diagnostic Criterion of Fluorocarbon Gas—a Substitute Gas for SF6
Li Kang1, Guo Runrui1,2, Zhang Guoqiang1
1. Institute of Electrical Engineering Chinese Academy of Sciences Beijing 100190 China; 2. University of Chinese Academy of Sciences Beijing 100190 China
Abstract：Fluorocarbon gas c-C4F8 is one of the potential substitution candidates for SF6 because of its low global warming potential (GWP) and high dielectric performance. Gas insulated switchgears using c-C4F8 gas mixture will be a new type of environment-friendly device. The decomposition gas analysis method is an important way for fault diagnosis by measuring the decomposition gases generated by electrical fault, which has an irreplaceable role in some situation. However, different criteria are needed for different insulation gases. In this paper, the gas decomposition properties of fluorocarbon were studied by the simulating experiments of four kinds of faults. Accordingly, a fault diagnostic criterion was proposed. The experiment results show the main decomposition gases are C2F4, C3F6 under overheating fault, and the ratio of C2F4/C3F6 is different in different overheating temperature zones. Different form the overheating fault, the main decomposition gases under discharges are CF4, C2F6, C2F4, C3F8 and C3F6. Meanwhile, the ratios of C2F4/CF4, C2F4/C2F6 and C3F6/C3F8 are quite different for partial discharge, spark discharge and arc discharge. Therefore, a dynamic three-ratio method was proposed to identify three types of discharge faults by ratio variation tendency, which provides a way for monitoring faults of c-C4F8 insulation equipment.
李康, 郭润睿, 张国强. 一种SF6替代气体—氟碳气体的故障分解气体产生规律及基于分解物气体的故障判据研究[J]. 电工技术学报, 2019, 34(12): 2649-2656.
Li Kang, Guo Runrui, Zhang Guoqiang. Study on Fault Decomposition Properties and Fault Diagnostic Criterion of Fluorocarbon Gas—a Substitute Gas for SF6. Transactions of China Electrotechnical Society, 2019, 34(12): 2649-2656.
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2019, Vol. 34 
