The starting current of most AC motors is several times the normal full load current when starting them directly on line at full rated voltage. The starting torque varies directly as the square of the applied voltage. Excessive starting current causes a drop in terminal voltage which may result in the following:
- Failure of motor starting due to low starting torques.
- Unnecessary operation of under voltage relays.
- Stalling of other running motors connected to the network.
- Voltage dips at the power sources and consequent flicker in the lighting system.
Motor starting studies can help in the selection of best methods for motor starting, motor design, and system design thereby minimizing the impact of the motor starting.
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