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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

Chapter7: Symmetrical Faults

Section: Chapter Questions

Problem 7.3MCQ: The amplitude of the sinusoidal symmetrical ac component of the three-phase short-circuit current of...

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A generating station for a power system consists of five 122 MVA 15-kV 0.85-PF-lagging synchronous generators with identical speed droop characteristics operating in parallel. The governors on the generators’ prime movers are adjusted to produce a 2.5-Hz drop from no load to full load. four of these generators are each supplying a steady 72 MW at a frequency of 60 Hz, while the fifth generator (called the swing generator) handles all incremental load changes on the system while maintaining the system's frequency at 60 Hz. At a given instant, the total system loads are 500 MW at a frequency of 60 Hz. Compute the no-load frequencies of each of the system’s generators? If the system load rises to 600 MW and the generator’s governor set points do not change, compute the new system frequency be? To what frequency must the no-load frequency of the swing generator be adjusted in order to restore the system frequency to 60 Hz? If the system is operating at the conditions described in part (c), what would happen if the swing generator were tripped off the line (disconnected from the power line)?

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