变压器绝缘油老化产物的紫外可见光谱特性

绝缘油是变压器中的重要组成物质,其品质直接影响着绝缘系统的性能以及变压器的运行安全。绝缘油老化过程将导致其绝缘及散热性能下降,进而引发故障。因此,变压器绝缘油的分析检测是了解变压器工作状态的重要手段,分析结果是变压器检修及更换新油的参考依据。本文利用紫外—可见吸收光谱,对不同工作年份的绝缘油进行了光谱分析,得到了绝缘油老化程度与其紫外光谱特征的关联。进一步对糠醛这一标志性老化产物的紫外光谱进行了深入研究,结合量子化学计算,解析了糠醛紫外—可见光谱特征对应的电子跃迁机制。研究结果证实了紫外—可见光谱用于分析变压器绝缘油老化程度的有效性,相关结果可作为变压器检测的参考依据。

UV-Vis Spectral Characteristics of Aging Products of Transformer Insulating Oils

Insulating oil is an important component of transformers. Its quality directly affects the performance of the insulation system and the operation safety of the transformer. As working years increase, insulating oil interacts with oxygen, water, and other impurities in the environment to form a variety of aging products. This results in a decrease in its insulation and heat dissipation performance, which in turn causes failures. Therefore, analyzing and detecting transformer insulating oil is an important means to understand the working status of transformers. The analysis results are the reference basis for transformer maintenance and replacement of new oil. In this paper, ultraviolet-visible absorption spectrum is used to analyze insulating oil of different working years. The correlation between the aging degree of insulating oil and its ultraviolet spectral characteristics is obtained. The ultraviolet spectrum of furfural, a symbolic aging product, was studied by quantum chemical calculation. The mechanism corresponding to the ultraviolet-visible spectral characteristics of furfural was analyzed. The research results confirm the effectiveness of UV-visible spectroscopy in analyzing the aging degree of transformer insulating oil. The relevant results can be used as a reference for transformer detection.