INTEGRATED APPROACH TO THE STUDY OF THE DEPENDENCE OF THE AGING OF THE INSULATION SYSTEM OF THE VAZ215 ELECTRIC MOTOR ON THE BREAKDOWN VOLTAGE AND TEMPERATURE DURING THE SERVICE LIFE

This article discusses the development of a new methodology for assessing the durability of electric motor insulation systems based on a combination of experimental data and numerical methods. The relevance of the study is due to the need to improve the reliability of the insulation systems of the VAZ215-6AMO5 electric motor used to drive the main circulation pumps GTsN-195 for cooling nuclear reactors VVER-1000. During the work, a series of experiments were conducted to study the effect of temperature and breakdown voltage on the service life of the insulation. The analysis of the results showed that the reduction of the operating temperature of the windings slows down the aging of the insulation system, while the increase of the breakdown voltage helps to extend their service life. These findings emphasize the need to control the temperature and electrical parameters to improve the reliability of the insulation systems. For a more accurate assessment of the durability of insulation systems, a complex insulation aging function was integrated using various numerical methods. In particular, the methods of average rectangles, trapezoids, and Simpson were studied. A comparison of these methods revealed their advantages and disadvantages. The Simpson method, confirmed by a posteriori Runge accuracy assessment, turned out to be the most accurate, but its complexity in calculations makes it less convenient compared to the trapezoid method, which is suitable for rapid testing. The rectangle method, on the contrary, demonstrated low accuracy and required a significant reduction in the integration step, which limits its practical application. The study highlights the importance of selecting a suitable integration method depending on the specific conditions of the problem and accuracy requirements. The results obtained open up new prospects for practical application in the field of development and operation of insulation systems. In the future, it is planned to conduct an in-depth study of the influence of various factors on the durability of insulation materials, which will allow creating more accurate models for predicting their service life and optimizing the operating conditions of electric motors in various industries. This can significantly improve the efficiency and safety of electric motors in industry.