A 1200 kVA, 3.3-kV, three-phase, star-connected alternator has an effective resistance that is 1.5 times the dc resistance. The dc resistance is obtained by connecting two terminals to a dc source. The current and voltage are 87.6 A. and 6V, respectively. A field current of 30 A produces a current of 200 A on short-circuit and 1.1 kV on open circuit. a. Calculate the power angle and the total generated complex power when the generator is operating full-load of 1200 kVA at 0.9 pf lagging and at rated terminal voltage. Assume that flux varies as the field current. b. If the altenator is operating at the same excitation voltage as in (a), calculate the maximum kW output of the alternator.

A 1200 kVA, 3.3-kV, three-phase, star-connected alternator has an effective resistance that is 1.5 times the dc resistance. The dc resistance is obtained by connecting two terminals to a dc source. The current and voltage are 87.6 A. and 6V, respectively. A field current of 30 A produces a current of 200 A on short-circuit and 1.1 kV on open circuit. a. Calculate the power angle and the total generated complex power when the generator is operating full-load of 1200 kVA at 0.9 pf lagging and at rated terminal voltage. Assume that flux varies as the field current. b. If the altenator is operating at the same excitation voltage as in (a), calculate the maximum kW output of the alternator.

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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