1. A lighting load of 600 kW and a motor load of 707 kW at 0.707 lag are supplied by two alternators running in parallel. One of the machines supplies 900 kW at 0-9 p.f. lagging. Find the load and p.f. of the second [407 kW; 0-7916 lag] machine.

1. A lighting load of 600 kW and a motor load of 707 kW at 0.707 lag are supplied by two alternators running in parallel. One of the machines supplies 900 kW at 0-9 p.f. lagging. Find the load and p.f. of the second [407 kW; 0-7916 lag] machine.

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

1. A lighting load of 600 kW and a motor load of 707 kW at 0.707 lag are supplied by two alternators running
in parallel. One of the machines supplies 900 kW at 0-9 p.f. lagging. Find the load and p.f. of the second
machine.
[407 kW; 0-7916 lag]

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