热故障下天然酯绝缘油中溶解气体分析

Analysis of Dissolved Gases in Natural Ester Insulating Oil Under Thermal Fault

开展了天然酯绝缘油与矿物绝缘油在200~700℃的热故障模拟试验研究,并对产生的溶解气体进行对比分析。结果表明:由于自身的成分组成特性,天然酯绝缘油和矿物绝缘油Ostwald系数存在着一定的差异。在相同的热故障条件下,天然酯绝缘油产气速率与产气量远高于矿物绝缘油,且产生的C_2H_6、CO和CO_2等3种气体含量占气体总含量的90%以上,且主要特征气体和次要特征气体存在着一定差异,现有的适用于矿物绝缘油的故障类型诊断方法并不适用于天然酯绝缘油。

Thermal fault simulation experiments were conducted on natural ester insulating oil and mineral insulating oil at 200-700 ℃, and the dissolved gases generated by them were compared. The results show that the Ostwald coefficient of natural ester insulating oil is different from that of mineral insulating oil because of different component characteristics. Under the same thermal fault, the generation rate and amount of dissolved gases natural ester insulating oil are much higher than that of mineral insulating oil, and the content of C2H6, CO, and CO2 is over 90% of the gases generated in natural ester insulating oil. The major and secondary characteristic gases in the two kinds of insulating oils are different, so that the current diagnosis method of fault types for mineral insulating oil is not feasible to natural ester insulating oil.