The starting current of induction motors is usually five to ten times full load current when starting them Directly On Line. Motor starting torque varies directly as the square of the applied voltage. If the terminal voltage drop is excessive, the motor may not have enough starting torque to accelerate up to running speed. Moreover the already running motors may stall from excessive voltage drops or undervoltage relay may trip. The analysis can help select the best method of starting, the proper motor design, or the required system design for minimising the impact of motor starting on the entire system.

 

 

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