Almost 70% of loads used in the world consists of induction motors in various types and forms. Mostly a thyristor is used in rectifiers and variable-speed drives. The thyristor is a power electronics device that is widely used in various electrical appliances due to its lower on-conduction losses, easyavailability, lower switching loss, greater efficiency and cost-benefit. In this paper, the starting of squirrel cage induction motors 1000kW by variable frequency drive in Tabriz pump station has been analysed by the ETAP 19.0.1 software. For this reason, the starting voltage drop should not exceed 15% of the terminal voltage. It will also directly impact the power quality of the power system. This starting current will result in the motors and transformer and voltage drop in users' appliances connected to the electric grid to the extent that it might even cause a shutdown in the grid or not start the motor. The starting current of induction motors is 5 to 7 times greater than the nominal current at the moment of starting until it reaches the nominal torque. These motors are directly fed from the power grid and are exploited afterward. Medium-voltage induction motors are essential electrical machines in the oil, petrochemical, and process industries therefore, the study of induction motors is an integral part of the analysis of power system. In petroleum industrial systems, analysis of power systems should be considered to exploit system reliability and prevent change in process performance during starting in equipment such as induction motors and industrial pumps.
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