A 2300 V, 400 HP, 50 Hz, eight-pole, 0.85 Leading PF, Y-connected synchronous motor is having a negligible armature resistance, and a synchronous reactance of 10 Q. This motor is operating at EA = 2041 Volts, and & = -25°. If the flux is increased by 15 % while the power is kept constant, find the new armature current and the new power factor of the motor.

A 2300 V, 400 HP, 50 Hz, eight-pole, 0.85 Leading PF, Y-connected synchronous motor is having a negligible armature resistance, and a synchronous reactance of 10 Q. This motor is operating at EA = 2041 Volts, and & = -25°. If the flux is increased by 15 % while the power is kept constant, find the new armature current and the new power factor of the motor.

Introductory Circuit Analysis (13th Edition)

13th Edition

ISBN:9780133923605

Author:Robert L. Boylestad

Publisher:Robert L. Boylestad

Chapter1: Introduction

Section: Chapter Questions

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Concept explainers

Motor Load, Torque, and Power Quality Requirement

An electric motor is a gadget that changes electrical energy into mechanical energy over to follow up on a mechanical burden. The weight set on the motor because of this mechanical movement is known as motor load. Appropriately matching the motor burden to the engine is vital to forestall harm to the engine or wasteful and unnecessary expensive activity. Engines perform such undertakings as moving a thing starting with one spot then onto the next, cutting it, changing its shape, etc. The motors might be evaluated as far as a few variables including power yield, voltage, current, and temperature. Harm to an engine might happen when it is worked under over the top engine load contrasted with its appraised limit.

Question

A 2300 V, 400 HP, 50 Hz, eight-pole, 0.85 Leading PF, Y-connected synchronous motor is having a negligible armature resistance, and a
synchronous reactance of 10 0.
This motor is operating at EA = 2041 Volts, and & = -25°.
If the flux is increased by 15 % while the power is kept constant, find the new armature current and the new power factor of the motor.
Select one:
O a. lA = 121.4 Amp, and PF = 0.71 Lagging
O b. None
O c. lA = 121.4 Amp, and PF = 0.71 Leading
O d. la = 94.21 Amp, and PF = 0.79 Leading
O e. lA = 94.21 Amp, and PF = 0.79 Lagging
Clear my choice

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