A d.c. A shunt generator delivers a load current of 80 A at 400 V. Its armature and field resistances are 0.20 and 100 respectively. Stray losses are 1500 watts. So find (1) mechanical (2) electrical and (3) commercial efficiency.

A d.c. A shunt generator delivers a load current of 80 A at 400 V. Its armature and field resistances are 0.20 and 100 respectively. Stray losses are 1500 watts. So find (1) mechanical (2) electrical and (3) commercial efficiency.

Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter6: Power Flows

Section: Chapter Questions

Problem 6.45P

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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

A d.c. A shunt generator delivers a load current of 80 A at 400 V. Its armature and field
resistances are 0.20 and 100 respectively. Stray losses are 1500 watts. So find (1)
mechanical (2) electrical and (3) commercial efficiency.

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