Electrician Red Seal · Question
Which type of motor starter is typically used when it is necessary to reduce the inrush current of a large three-phase induction motor at startup, and the load can tolerate a reduced starting torque?
A Wye-delta (star-delta) starter is specifically designed to reduce the starting current of a three-phase induction motor by connecting the motor windings in a
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Question: Which type of motor starter is typically used when it is necessary to reduce the inrush current of a large three-phase induction motor at startup, and the load can tolerate a reduced starting torque?
Answer options:
- Direct-on-line (DOL) starter
- Across-the-line starter ✅ Wye-delta (star-delta) starter
- Reversing starter
Correct answer: Wye-delta (star-delta) starter
Explanation: A Wye-delta (star-delta) starter is specifically designed to reduce the starting current of a three-phase induction motor by connecting the motor windings in a Wye (star) configuration during startup, then switching to a Delta configuration for normal running. This reduces the applied voltage to the windings during startup, thereby reducing the inrush current, but also reduces the starting torque. DOL and across-the-line are the same and provide full voltage and high inrush, while a reversing starter changes direction.
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