Answered: A 10-kw 250-volt compound (long-shunt)…

Engineering

Electrical Engineering

A 10-kw 250-volt compound (long-shunt) generator has a no-load

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

Chapter11: Transient Stability

Section: Chapter Questions

Problem 11.8P

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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 10-kw 250-volt compound (long-shunt) generator has a no-load
voltage of 230. The shunt field has 800 turns per pole and the seriesfield 8.5 turns per pole. The shunt- and series-field resistances are 80 ohms and 0.07 ohm,
respectively. To make the generator flat-compound, it will have a noload voltage of 230 and a full-load voltage of 230; the series field must
produce 225 amp-turns. Calculate the total number of ampere-turns
provided by each pole at no load and full load.

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