变压器油浸绝缘纸老化产生甲醇的途径

Approaches of Methanol Deriving from Aging of Transformer Oil-immersed Insulation Paper

为了研究变压器油浸绝缘纸老化产物甲醇的产生途径,设计不同温度和初始水分含量下的老化实验,采用顶空进样的气相色谱-质谱联用法对老化后的油中甲醇含量进行测量;以绝缘纸聚合度为参量建立老化动力学模型,对纤维素老化及甲醇生成的实验结果进行计算分析,得到结论:甲醇主要来自于纤维素氧解的中间产物,且氧解中间产物进一步反应生成甲醇需要水的协同作用。在此基础上,设计中间产物的老化实验,对该结论提供了一定的证明,为建立基于油中甲醇含量的变压器状态评估体系提供了支撑。

In order to study producing approaches of methanol deriving from aging transformer oil-immersed insulation pa-per, this paper designs aging experiments under conditions of different temperature and initial water content. It adopts gas- chromatography-mass spectrum （GC-MS） method with headspace sampling for measuring methanol content in the oil and performs calculating analysis on experimental results about cellulose pyrolysis and methanol production by building an aging dynamics model which takes degree of polymerization of the insulation paper as parameter. It draws conclusion from results that methanol is mainly derived from intermediate products of oxygen solution of cellulose and further reaction and genera-tion of methanol of those intermediate products need synergistic effect of water. Furthermore, it designs aging experiment on intermediate products which proves the above conclusion and provides support for evaluation system for transformer state based on methanol content in oil.