A 1000 kVA, 6.6kV, 3-phase, star-connected alternator has a field resistance of 0.50 ohm per phase and an armature resistance of 0.05 ohm per phase. The field current at full load at 0.85 pf lagging is 200A. The stray power loss is 84kW. Calculate the efficiency at full load 0.90 pf lagging.

A 1000 kVA, 6.6kV, 3-phase, star-connected alternator has a field resistance of 0.50 ohm per phase and an armature resistance of 0.05 ohm per phase. The field current at full load at 0.85 pf lagging is 200A. The stray power loss is 84kW. Calculate the efficiency at full load 0.90 pf lagging.

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

Synchronous Generator

In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.

Salient Pole Rotor

Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.

Question

100%

A 1000 kVA, 6.6kV, 3-phase,
star-connected alternator has
a field resistance of 0.50 ohm
per phase and an armature
resistance of 0.05 ohm per
phase. The field current at full
load at 0.85 pf lagging is
200A. The stray power loss is
84KW. Calculate the efficiency
at full load 0.90 pf lagging.
use two decimal places if the
answer is not exact and do not
include the unit anymore.

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