A 3-phase, 2000 kVA, 11 kV, 1800 rpm synchronous generator has a resistance of synchronous reactance of 15 ohms per phase. (a) The field current is adjusted to obtain the rated terminal voltage at open circuit. i. Determine the excitation voltage Ef . ii. If a short circuit is applied across the machine terminals, find the stator current. (b) The synchronous machine is next connected to an infinite bus. The generator is made to deliver the rated current at 0.8 power factor lagging. i. Determine the excitation voltage Ef . ii. Determine the maximum power the synchronous machine can deliver for the excitation current of part (b). Neglect Ra.

A 3-phase, 2000 kVA, 11 kV, 1800 rpm synchronous generator has a resistance of synchronous reactance of 15 ohms per phase. (a) The field current is adjusted to obtain the rated terminal voltage at open circuit. i. Determine the excitation voltage Ef . ii. If a short circuit is applied across the machine terminals, find the stator current. (b) The synchronous machine is next connected to an infinite bus. The generator is made to deliver the rated current at 0.8 power factor lagging. i. Determine the excitation voltage Ef . ii. Determine the maximum power the synchronous machine can deliver for the excitation current of part (b). Neglect Ra.

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 11.1P

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