A 13.8 kV, 50-MVA, 0.9 p.f., 60 Hz, four pole, Y-connected synchronous generator has a synchronous reactance of 2.5 ohms, and an armature resistance of 0.2 ohm. At 60 Hz, its friction and windage losses are 1 MW, and its core losses are 1.5 MW. The field circuit has a dc voltage of 120 V, and the maximum field current is 5A. The current of the field circuit is adjustable over the range from 0 to 10 A. The OCC of this generator is shown in the figure. What will the terminal voltage of this generator be if it is connected to a delta- connected with an impedance of 24 cis 25 deg ohms? * Open-circuit characteristic 18 16 14 12 10 3 4 6. 9. 10 Field cument (A) Open-circuit voltage (kV) 20
A 13.8 kV, 50-MVA, 0.9 p.f., 60 Hz, four pole, Y-connected synchronous generator has a synchronous reactance of 2.5 ohms, and an armature resistance of 0.2 ohm. At 60 Hz, its friction and windage losses are 1 MW, and its core losses are 1.5 MW. The field circuit has a dc voltage of 120 V, and the maximum field current is 5A. The current of the field circuit is adjustable over the range from 0 to 10 A. The OCC of this generator is shown in the figure. What will the terminal voltage of this generator be if it is connected to a delta- connected with an impedance of 24 cis 25 deg ohms? * Open-circuit characteristic 18 16 14 12 10 3 4 6. 9. 10 Field cument (A) Open-circuit voltage (kV) 20
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
Chapter12: Power System Controls
Section: Chapter Questions
Problem 12.11P
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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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Synchronous generator
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