Distribution of Copper Particle in Insulating Oil and Its Influence on Breakdown Strength of Insulating Oil under Combined AC and DC Voltage
Wang Youyuan1, Li Xi1, Li Yuanlong1, Wei Chao2, Lu Yuncai2
1. State Key Laboratory of Power Transmission Equipment & System Safety and New Technology Chongqing University Chongqing 400044 China; 2. Jiangsu Electric Power Company Research Institute Nanjing 211103 China
Abstract：In order to study the motion distribution of solid particles and its influence on breakdown strength of insulating oil under combined AC and DC voltages, the motion distribution of copper microparticles and the breakdown voltage of insulating oil with different particle concentration under AC voltage, DC voltage and the combined AC and DC voltage with the ratio of AC to DC equal to 1 and 1/3 of two different electrode systems are investigated in this paper. The copper particle effect on the breakdown strength of insulating oil is discussed with the motion distribution of particle. The results show that the increase of DC component and particle concentration will promote the formation of copper particle bridge and increase the conduction current significantly. The breakdown voltage of insulating oil with copper particle at combined AC and DC voltage approximately obeys Weibull distribution. The breakdown voltage of insulating oil decreases with the increase of the DC voltage component in combined AC and DC voltage. Meanwhile, the breakdown voltage and the logarithm of particle number approximately satisfy the linear relationship.
王有元, 李熙, 李原龙, 蔚超, 陆云才. 交直流复合电压下铜颗粒在油中的分布及对绝缘油击穿特性的影响[J]. 电工技术学报, 2018, 33(23): 5581-5590.
Wang Youyuan, Li Xi, Li Yuanlong, Wei Chao, Lu Yuncai. Distribution of Copper Particle in Insulating Oil and Its Influence on Breakdown Strength of Insulating Oil under Combined AC and DC Voltage. Transactions of China Electrotechnical Society, 2018, 33(23): 5581-5590.
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2018, Vol. 33 
