What is the primary purpose of line reactors in VFD-powered systems?

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Multiple Choice

What is the primary purpose of line reactors in VFD-powered systems?

Explanation:
Line reactors are series inductors placed in the supply line to a VFD. Their primary function is to damp the current pulses caused by the drive’s input rectifier, which reduces the harmonic content that feeds back onto the electrical system. By adding impedance, they limit high‑frequency currents and smooth the current waveform, improving power quality and reducing EMI and voltage spikes. This is why the main purpose is to lessen harmonics. They don’t directly increase motor speed or overall efficiency, and while they can help with inrush and transient suppression, reducing continuous current isn’t their main goal.

Line reactors are series inductors placed in the supply line to a VFD. Their primary function is to damp the current pulses caused by the drive’s input rectifier, which reduces the harmonic content that feeds back onto the electrical system. By adding impedance, they limit high‑frequency currents and smooth the current waveform, improving power quality and reducing EMI and voltage spikes. This is why the main purpose is to lessen harmonics. They don’t directly increase motor speed or overall efficiency, and while they can help with inrush and transient suppression, reducing continuous current isn’t their main goal.

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