Q2 (a) Indicate any changes in a stand alone synchronous generators performance or operating limits for the following changes to the generator design or operation: (i) A reduction in the synchronous reactance. (ii) An increase in generator speed. (iii) An increase in the rotor current. (iv) An increase in the number of turns in the stator windings. A star connected 3 phase wound field synchronous generator (Xs=4 2) operates with a 15 kV Excitation voltage at a load angle of 3GS° and is connected to a 11 kV (phase voltage) grid. Using a combination of calculation and scaled phasor diagram determine the resultant line current (A), power factor and total output power (W). Draw the resultant phasor diagram to scale including the resultant line current. (b) The load power is now halved with the Excitation voltage kept constant. Using the phasor diagram drawn in Q2(b) graphically determine the new line current, power factor and load angle. (c) Calculate the maximum theoretical output power for this given Excitation voltage and grid phase voltage. (d)
Q2 (a) Indicate any changes in a stand alone synchronous generators performance or operating limits for the following changes to the generator design or operation: (i) A reduction in the synchronous reactance. (ii) An increase in generator speed. (iii) An increase in the rotor current. (iv) An increase in the number of turns in the stator windings. A star connected 3 phase wound field synchronous generator (Xs=4 2) operates with a 15 kV Excitation voltage at a load angle of 3GS° and is connected to a 11 kV (phase voltage) grid. Using a combination of calculation and scaled phasor diagram determine the resultant line current (A), power factor and total output power (W). Draw the resultant phasor diagram to scale including the resultant line current. (b) The load power is now halved with the Excitation voltage kept constant. Using the phasor diagram drawn in Q2(b) graphically determine the new line current, power factor and load angle. (c) Calculate the maximum theoretical output power for this given Excitation voltage and grid phase voltage. (d)
Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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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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Transcribed Image Text:Q2 (a)
Indicate any changes in a stand alone synchronous generators performance
or operating limits for the following changes to the generator design or
operation:
(i)
A reduction in the synchronous reactance.
(ii)
An increase in generator speed.
(iii)
An increase in the rotor current.
(iv)
An increase in the number of turns in the stator windings.
A star connected 3 phase wound field synchronous generator (Xs=4 2)
operates with a 15 kV Excitation voltage at a load angle of 3G5° and is
connected to a 11 kV (phase voltage) grid. Using a combination of
calculation and scaled phasor diagram determine the resultant line
current (A), power factor and total output power (W). Draw the resultant
phasor diagram to scale including the resultant line current.
(b)
The load power is now halved with the Excitation voltage kept constant.
Using the phasor diagram drawn in Q2(b) graphically determine the new
line current, power factor and load angle.
(c)
Calculate the maximum theoretical output power for this given
Excitation voltage and grid phase voltage.
(d)
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