Influence of Electricity Disconnections on Electric Drives of Industrial Machines and Mechanisms

Abstract

Disconnection of consumers from the power supply leads to losses from disruption of technological processes, long downtime and production of defective products, reducing the service life of electrical equipment and appliances, increasing costs and losses of electricity, emergencies. Currently in Ukraine, power outages reach up to 10 % of the total time of technological processes during the year and more. Power outages cause frequent starts and braking of the motor. At a significant frequency of the induction motor, losses in transients cause its intense heating. The aim of the study was to establish the effect of power outages on the temperature of the drive electric motor of industrial machines and mechanisms. A study of the impact of power outages on energy losses and thermal regime of the electric motor was conducted. The dependences of energy losses and allowable frequency of motor starts on the number of outages are determined. It is established that frequent power outages cause an increase in energy losses, which are directly proportional to the frequency of outages. At the same time the admissible frequency of switching on of the electric motor decreases in proportion to quantity of shutdowns.