应用拉曼光谱分析变压器油中溶解乙酸含量

发布时间：2018-02-05 17:01

本文关键词： 乙酸原位检测拉曼光谱定量分析　出处：《光谱学与光谱分析》2017年09期 　论文类型：期刊论文

【摘要】：乙酸是变压器油纸绝缘老化所生成酸类物质的主要成分;分析变压器油中溶解乙酸含量对准确评估运行变压器的老化状态具有重要意义。拉曼光谱技术是基于拉曼效应的一种分子分析技术,能很好地用于物质的非接触式原位检测。论文开展了变压器油中溶解乙酸含量拉曼光谱检测方法研究:利用Gaussian09W软件分析了乙酸分子的拉曼振动特性,对实测乙酸拉曼谱峰的振动模式进行了指认;基于实验室搭建的激光拉曼光谱液体检测平台,对不同乙酸含量的变压器油样进行了原位检测;选定891cm~(-1)作为变压器油中溶解乙酸分子的拉曼特征峰,基于乙酸891cm~(-1)与变压器油932cm~(-1)特征峰面积比值和最小二乘法建立了乙酸的定量分析方法,检测限可达0.08mg·mL~(-1)。实验结果表明:激光拉曼光谱可应用于油中溶解乙酸含量原位检测并具有良好的检测稳定性和重复性,为变压器油中溶解乙酸含量的快速、无损检测提供了一种新方法。
[Abstract]:Acetic acid is the main component of acid substance produced by insulation aging of transformer oil paper. It is important to analyze dissolved acetic acid content in transformer oil to accurately evaluate the aging state of running transformer. Raman spectroscopy is a molecular analysis technology based on Raman effect. In this paper, Raman spectroscopy of dissolved acetic acid content in transformer oil is studied. The Raman vibration characteristics of acetic acid were analyzed by Gaussian09W software. The vibrational modes of the measured Raman spectra of acetic acid are identified. Based on the laser Raman spectrum liquid detection platform, the transformer oil samples with different acetic acid content were detected in situ. 891cm ~ (-1) was selected as the Raman characteristic peak of dissolved acetic acid molecule in transformer oil. The quantitative analysis method of acetic acid was established based on the ratio of characteristic peak area to 932 cm ~ (-1) of acetic acid (891cm ~ (-1)) and the least square method. The detection limit is 0.08mg 路mL ~ (-1). The experimental results show that laser Raman spectroscopy can be used for in-situ detection of dissolved acetic acid in oil and has good stability and reproducibility. It provides a new method for fast and nondestructive detection of dissolved acetic acid in transformer oil.
【作者单位】：重庆大学输配电装备及系统安全与新技术国家重点实验室;
【基金】：国家自然科学基金项目(61605020) 重庆市基础科学与前沿技术研究专项(CSTC2016jcyjA0427) 中央高校基本科研业务费(106112016DJCR151224)资助
【分类号】：O657.37;TE626.3

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