基于热焓分析的变压器油热解机制及热故障严重程度评估

发布时间：2018-05-23 15:15

本文选题：变压器油 + 热焓分析　；参考：《中国电机工程学报》2014年33期

【摘要】：油中溶解气体总含量及其产气速率被普遍应用于诊断变压器内部故障的严重程度,但这类方法忽视了生成不同气体成分的能量差异。引入热焓分析研究了变压器油的热解机制与热故障严重程度的评估方法。基于热力学理论,对C20H42的热解产气机制进行了模拟,获得了不同气体组分的生成含量与温度的关系;然后依据热焓分析,对可表征反应过程能量变化的特征气体生成能进行了计算,得到各气体生成能的排列顺序为CH4C2H6C3H8C3H6C2H4H2C2H2;由此进一步建立了基于能量加权的油中溶解气体总含量分析法,提出评估变压器热故障严重程度的新判据。实例表明,与传统的油中溶解气体分析相比,基于能量加权的热故障严重程度评估方法具有更加准确、灵敏的应用优势。
[Abstract]:The total dissolved gas content and gas production rate in oil are widely used to diagnose the severity of transformer internal faults, but this method ignores the energy differences of different gas components. Enthalpy analysis was introduced to study the pyrolysis mechanism of transformer oil and the method to evaluate the severity of thermal failure. Based on thermodynamics theory, the mechanism of pyrolysis gas production of C20H42 is simulated, and the relationship between the formation content of different gas components and temperature is obtained, and then according to the analysis of enthalpy, The formation energy of characteristic gas which can characterize the energy change of reaction process is calculated, and the order of formation energy of each gas is Ch _ 4C _ 2H _ 6C _ 3H _ 8C _ 3H _ 3H _ 2H _ 2C _ 2H _ 2H _ 2H _ 2. A new criterion for evaluating the severity of transformer thermal failure is proposed. The example shows that compared with the traditional analysis of dissolved gas in oil, the thermal fault severity assessment method based on energy weighting is more accurate and sensitive in application.
【作者单位】：华北电力大学电气与电子工程学院;山东大学电气工程学院;河北电力科学研究院;
【基金】：北京市自然科学基金项目(31420181) 高等学校学科创新引智计划(“111”计划)(B08013)~~
【分类号】：TM407

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