Gorpinich A. Electrical equipment reliability evaluation at poor power quality

Object of research - electrical networks of industrial enterprises with nonlinear and unbalanced loads. Purpose of research - founding the direct dependence of electrical equipment insulation reliability indices on the voltage distortion and unbalance probabilistic characteristics, random effects of operating factors and physical properties of applied materials. Methods of research. At the solving of dissertational tasks theoretical and experimental methods were used: on the theoretical level - methods of mathematical modeling, reliability theory, probability and mathematical statistics theory, electrical circuit theory; on the experimental level - methods of physical modeling on the test specimens. The mechanism of the electrical equipment creeping failures caused by accelerated insulation aging due to voltage distortion and unbalance is analyzed. Mathematical models to incorporate the voltage distortion and unbalance probabilistic characteristics in the functional reliability evaluation of power transformers, induction motors and cables are developed. The impact of probabilistic characteristics of distorted voltage peak value on electrical equipment reliability is considered and the insulation electrical aging model to take into account the phase angles of individual harmonic voltages is developed. The materials of theoretical and methodical developments were introduced in the educational process of Pryazovskyi State Technical University and in the development practice of JSC "Kievpromelectroproect". Area of use - power industry.