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The article describes a method for detecting developing defects in high-power oil-filled transformers, based on the results of analysis of dissolved gases in oil. It has been found that an early diagnostic sign of development of ionization processes of aging and thermal degradation in transformers’ isolation is the appearance of a systematic trend in the time dependencies of hydrocarbon gas content. Though, exceeding the concentrations of gases regulated by boundary values (the traditional criterion) does not always reflect the damage to the insulation, it often being reversible.

Method for Detection of Developing Defects in High-Voltage Power Transformers by Results of the Analysis of Dissolved Oil Gases