12 A three-phase motor draws 9 kVA at a lagging PF of 0.8 from a balanced system with line voltages of 300 V rms at 60 Hz. Three capacitors of what size should be arranged as a parallel A-connected load to produce unity PF operation?

12 A three-phase motor draws 9 kVA at a lagging PF of 0.8 from a balanced system with line voltages of 300 V rms at 60 Hz. Three capacitors of what size should be arranged as a parallel A-connected load to produce unity PF operation?

Delmar's Standard Textbook Of Electricity

7th Edition

ISBN:9781337900348

Author:Stephen L. Herman

Publisher:Stephen L. Herman

Chapter31: Three-phase Alternators

Section: Chapter Questions

Problem 1RQ: What conditions must be met before two alternators can be paralleled together?

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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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12 A three-phase motor draws 9 kVA at a lagging PF of 0.8 from a balanced
system with line voltages of 300 V rms at 60 Hz. Three capacitors of what size
should be arranged as a parallel A-connected load to produce unity PF operation?

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