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  

Comparative Study on Lightning Impulse Breakdown and Gas Production Characteristics of Three-Element Mixed Insulation Oil and Mineral Oil

作　　者：陈鑫 郝建[1] 冯大伟[1] 杨丽君[1] 廖瑞金[1] Chen Xin;Hao Jian;Feng Dawei;Yang Lijun;Liao Ruijin(State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing University,Chongqing 400044,China)

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学)

出　　处：《电工技术学报》2020年第4期906-918,共13页Transactions of China Electrotechnical Society

基　　金：国家电网公司总部科技项目(混合绝缘油变压器关键技术研究);国家自然基金创新研究群体基金(51321063)资助

摘　　要：混合绝缘油由于能统筹兼顾矿物油和植物油的优点而受到国内外研究学者的广泛关注。该文以矿物油为参比,针对一种新型三元混合式绝缘油的雷电冲击击穿及产气特性开展对比研究,分析比较极不均匀电场形式下油隙长度为5~25mm的两种油品分别在正、负极性雷电冲击电压作用下的击穿电压、放电发展速度和产气含量的差异。结果表明:在正极性雷电冲击电压下,三元混合式绝缘油与矿物油的雷电冲击击穿电压相差不大;在负极性雷电冲击电压下,矿物油的雷电冲击电压约是三元式混合绝缘油的1.5~3.5倍;矿物油在正、负极性雷电冲击电压下的放电发展速度均大于三元混合式绝缘油;随着针-板油隙距离的增大,两种油品的击穿电压和放电发展速度均呈现不同幅度的增长;在正、负极性雷电冲击击穿相同次数后,三元式混合绝缘油中溶解的气体含量显著小于矿物油;油中溶解的H2、C2H2是三元混合式绝缘油电弧放电分析的首选特征量。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 5 mm and 25 mm. 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.

关 键 词：三元混合式绝缘油 雷电冲击 极不均匀电场 击穿特性 溶解气体 

分 类 号：TM470.4037[电气工程—电器]