Three Identical steam-turbine generators G 1 ,G 2 , and G 3 are operating in parallel Each generator is 7.2 KV,25.4 MVA, 60 Hz, 0.77 PF lagging 4 poles, Y- connected with synchronous reactance of 2 Ω and an armature resistance of 0.05 Ω. Each of generators G 1 and G 2 has a characteristic power frequency slope of 5.8 MW/ Hz , and no - load frequency of 62.5 Hz. Generator G 3 has a characteristic power- frequency slope of 6.0 MW/ Hz Find the no-load frequency of generator G 3 for which all generators supply a load of 42.6 MW, at Fsys=60Hz.

Three Identical steam-turbine generators G 1 ,G 2 , and G 3 are operating in parallel Each generator is 7.2 KV,25.4 MVA, 60 Hz, 0.77 PF lagging 4 poles, Y- connected with synchronous reactance of 2 Ω and an armature resistance of 0.05 Ω. Each of generators G 1 and G 2 has a characteristic power frequency slope of 5.8 MW/ Hz , and no - load frequency of 62.5 Hz. Generator G 3 has a characteristic power- frequency slope of 6.0 MW/ Hz Find the no-load frequency of generator G 3 for which all generators supply a load of 42.6 MW, at Fsys=60Hz.

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

Chapter2: Fundamentals

Section: Chapter Questions

Problem 2.16P: A single-phase, 120V(rms),60Hz source supplies power to a series R-L circuit consisting of R=10 and...

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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.

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