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The article discusses the issue of the fire hazard of the dielectric medium of a transformer (transformer oil), in which, over the period of operation, the characteristics, including fire-hazardous properties, change. The purpose of the work is to study the transformer dielectric medium (transformer oil) for flammability. The article presents the results of laboratory tests of new and used transformer oil to determine the parameters of the ignition temperature and flash point. Statistical data on fires related to electrical equipment are analyzed. It has been established that with prolonged and intensive production, the physico-chemical properties of transformer oil deteriorate. The presented studies confirm that transformer oil can transform from a flammable liquid into a more flammable liquid. Studies to determine the flash point and ignition were carried out using laboratory equipment in accordance with GOST 12.1.044-2018. The reason for this critical transformation is being investigated and a more in-depth analysis of samples of new and used transformer oil is carried out using a Crystallux-4000M chromatograph. It has been established that during the period of operation, transformer oil loses its properties, including an increased fire hazard, namely, the ignition temperature and flash point decrease by 19% and 32.2%, respectively. It has been revealed that due to changes in the chemical structure of the oil, its fire safety index is deteriorating. Attention is focused on the urgency of the problem of timely replacement of transformer oil, as it is one of the main sources of fire danger. Ways to solve it are proposed in the form of: more thorough monitoring of the condition and replacement time of transformer oil.