Abstract：Mixed insulation oil takes into account the advantages of mineral oil and natural ester, which has attracted wide attention from researchers at home and abroad. Taking mineral oil as control group, this paper studied the lightning impulse behaviors and gas production characteristics of a novel three-element mixed insulation oil under severe non-uniform electric field. The gap distance of needle-plate electrode structure was between 5mm and 25mm. The differences in breakdown voltage, discharge propagation velocity and gas production for two kinds of oils were analyzed under positive and negative lightning impulse voltages. The results show that the lightning impulse breakdown voltage of three-element mixed insulation oil is close to that of mineral oil under the positive lightning impulse. However, under the negative lightning impulse, the lightning impulse breakdown voltage of mineral oil is 1.5~3.5 times that of the three-element mixed insulation oil. The discharge propagation velocity of mineral oil is slightly faster than that of the three-element mixed insulation oil under both positive and negative lightning impulse voltages. With the increase of oil gap distance, the lightning impulse breakdown voltage and discharge propagation velocity show upward trend in different growth amplitudes, respectively. After the positive lightning impulse and negative lighting impulse have the same number breakdowns, the dissolved gas concentration in the three-element mixed insulation oil is significantly lower than that of mineral oil. Besides, the H2 and C2H2 can be used as the characteristic gases for the arc discharge analysis of three-element mixed insulation oil.
陈鑫, 郝建, 冯大伟, 杨丽君, 廖瑞金. 三元混合式绝缘油和矿物油的雷电冲击击穿及产气特性对比分析研究[J]. 电工技术学报, 2020, 35(4): 906-918.
Chen Xin, Hao Jian, Feng Dawei, Yang Lijun, Liao Ruijin. Comparative Study on Lightning Impulse Breakdown and Gas Production Characteristics of Three-Element Mixed Insulation Oil and Mineral Oil. Transactions of China Electrotechnical Society, 2020, 35(4): 906-918.
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2020, Vol. 35 
