Abstract
This review describes one of transformer oil degradation mechanisms - an increase in the fraction of aromatic compounds during the operation of oil-filled electric power equipment. The influence of such substances on the properties and characteristics of oils used in the power system of the Russian Federation, and the features relating to the operation of oil filled transformers with an increased fraction of arenes are discussed. The need to monitor the fraction of aromatic compounds in transformer oils is substantiated. The known qualitative and quantitative analysis methods suitable for this purpose (Nastyukov reaction, mass spectroscopy, ultraviolet spectroscopy, infrared spectroscopy, nuclear magnetic resonance, Raman scattering, chromatography, luminescence, and the nomogram method) are listed. The paper gives brief characteristics of the parameters by which the fraction of aromatic groups in transformer oil is determined. The advantages and disadvantages of each method are analyzed with taking into account the features of the systems under study. It is concluded that infrared spectroscopy and 1H and 13C nuclear magnetic resonance are the most promising ones for monitoring the content of aromatic substances in transformer oil, whereas the use of Raman scattering and luminescence methods requires further research and development for being applied in transformer oil analysis procedures.
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