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The article is a publication of scientific and methodical character. The analysis of researches and publications has shown that it is urgent to continuously improve methods of determining the influence of acoustic cavitation on degradation of power oils in order to diagnose further the condition of these oils; develop measures to prevent such degradation or reduce its influence on the quality of power oils during their operation in oil-filled heat-mechanical equipment of a nuclear power plant. The paper deals with the results of improving the method for determining the degradation of energy oils under the influence of acoustic cavitation. The aim of the study is to improve the reliability of the results of determining the effect of acoustic cavitation on the degradation of energy oils. Subjects of research: turbine oils "Azmol TP-22с", "Agrinol TP-22", "TP- 30", "Reolube®OMTI" (based on trixylene phosphates), compressor oil "HF-12-16". The paper improves the schematic diagram of an installation for studying the effect of acoustic cavitation on the degradation of energy oils, which allows performing studies at an ultrasonic emitter power of 20 W with frequencies up to 125 kHz. During the study of the air (or hydrogen) content in turbine oils under the influence of ultrasonic cavitation in the presence of air (or hydrogen) above the surfaces of these turbine oils, it was shown that at a temperature of 20°C, these turbine oils contain air (or hydrogen) in the form of an emulsion with a total content of the corresponding gas (air or hydrogen) of no more than 15 % by volume. In the course of studying the effect of ultrasonic cavitation on the degradation of energy oils, it was found that under the influence of ultrasonic cavitation in energy oils: gases C2H6, C2H4, C2H2, CH4, H2, CO, CO2 are generated and dissolved in them; solid carbon particles are generated; the content of additives "Ionol", "B-15/41", "D-157" decreases. The presence of H2S or SO2 in gas flows over mineral turbine oils and the presence of PH3 in gas flows over fire-resistant synthetic turbine oil under the influence of ultrasonic cavitation on these turbine oils was established. For the studied energy oils in the temperature range of 10-100°C: an increase in temperature or ultrasonic irradiation leads to a decrease in the kinematic viscosity. The results of research can be used for reasonable choice or design: measuring equipment for subsequent determination of the nature of degradation of demulsifying, deactivating, anti-wear and anti-foam additives, combined additives and inhibitors of oxidation and corrosion in power oils under the influence of acoustic cavitation in the bearing units of hydrogencooled turbine generators equipped with turbine oil circulation systems; elements of systems for diagnostics of the state of these power generators; elements of systems for diagnostics of the state of these power oils. [ABSTRACT FROM AUTHOR]