2. Two exactly similar turbo alternators are rated 20 MW each. They are operated in parallel. The characteristics are such that the frequency of one alternator from 60 Hz on no-load to 58 Hz on full load, and that of second alternator from 60 Hz at no-load to 58.5 Hz on full load. Determine the MW load on each alternator when they share a load of 28 MW. Also, determine the operating frequency. Answer: 12 MW, 16 MW, 58.8 Hz

2. Two exactly similar turbo alternators are rated 20 MW each. They are operated in parallel. The characteristics are such that the frequency of one alternator from 60 Hz on no-load to 58 Hz on full load, and that of second alternator from 60 Hz at no-load to 58.5 Hz on full load. Determine the MW load on each alternator when they share a load of 28 MW. Also, determine the operating frequency. Answer: 12 MW, 16 MW, 58.8 Hz

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 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

2. Clear and complete solution.

2. Two exactly similar turbo alternators are rated 20 MW each. They are operated in parallel. The
characteristics are such that the frequency of one alternator from 60 Hz on no-load to 58 Hz on full load,
and that of second alternator from 60 Hz at no-load to 58.5 Hz on full load. Determine the MW load on
each alternator when they share a load of 28 MW. Also, determine the operating frequency.
Answer: 12 MW, 16 MW, 58.8 Hz

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