A 11 kV, 500 MVA alternator is connected to a slow C.B. through a bus-bar. Determine the three ratings of the C.B, the average RRRV, and the oscillation frequency knowing that it reaches the peak re-striking voltage with 100 µs time.

A 11 kV, 500 MVA alternator is connected to a slow C.B. through a bus-bar. Determine the three ratings of the C.B, the average RRRV, and the oscillation frequency knowing that it reaches the peak re-striking voltage with 100 µs time.

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

Q4 A 11 kV, 500 MVA alternator is connected to a slow C.B. through a bus-bar.
Determine the three ratings of the C.B, the average RRRV, and the oscillation
frequency knowing that it reaches the peak re-striking voltage with 100 µs time.

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