An industrial plant uses two 3-phase induction motors rated at 460 V. At full load one draws 232 A at 0.85 pf lagging: the other draws 169 A at 0.82 pf lagging. Find the kVA rating of a synchronous capacitor that can serve to bring the plant power factor to 0.9 lagging.

An industrial plant uses two 3-phase induction motors rated at 460 V. At full load one draws 232 A at 0.85 pf lagging: the other draws 169 A at 0.82 pf lagging. Find the kVA rating of a synchronous capacitor that can serve to bring the plant power factor to 0.9 lagging.

Electric Motor Control

10th Edition

ISBN:9781133702818

Author:Herman

Publisher:Herman

Chapter39: Synchronous Motor Operation

Section: Chapter Questions

Problem 14SQ: Induction motors and welding transformers require magnetizing current, which causes a. lagging power...

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Concept explainers

Synchronous Motor

The synchronous motor is an AC electric type motor where at a steady-state the shaft rotation is synchronized with the supply current variable-frequency. To an integral number of AC cycles, the rotation period is exactly equal. The stator of the motor in the synchronous motor contains multi-phase AC electromagnets due to which a magnetic field is created that rotates in time with the oscillation of the line current. The rotor contains a permanent magnet and the rotor rotates in synchronization with the stator field at the same rate and provides the second synchronized magnetic field which is rotating in nature as a result. When the synchronous motor is supplied with independently excited multi-phase AC electromagnets on both the rotor and the stator, it is termed as a doubly-fed machine. The most widely used AC-type motors are the synchronous AC motor and the induction AC motors.

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