Autotransformer starters, sometimes called starting compensators, are sometimes used with larger polyphase induction motors. What function do they perform?
• Polyphase induction motor starting current vs. running current • Effect of reduced voltage on starting torque • How an autotransformer changes voltage applied to a load
• When a large induction motor is started "across the line" at full voltage, what happens to the inrush (starting) current and how can that affect the ship’s electrical system? • If you lower the applied voltage during starting, what happens to the motor’s starting torque and current draw compared to normal running conditions? • Does an autotransformer starter need to permanently regulate voltage, or is its main role just during the brief starting interval?
• Identify which choice talks about starting period only, not continuous running • Look for the option that focuses on changing the magnitude of voltage applied to the motor, not providing backup or emergency power • Recall that starting compensators are primarily used to limit line current when starting large motors—ask which option best supports that purpose
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