A star connected 3 phase wound field synchronous generator (Xs=4 N) 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)

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
icon
Related questions
Question

G5 =1 I.e angle is 31 degrees

solve Question B

 

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 Q)
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)
(c)
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.
Calculate the maximum theoretical output power for this given
Excitation voltage and grid phase voltage.
(d)
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 Q) 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) (c) 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. Calculate the maximum theoretical output power for this given Excitation voltage and grid phase voltage. (d)
Expert Solution
steps

Step by step

Solved in 2 steps with 2 images

Blurred answer
Knowledge Booster
Capacitor
Learn more about
Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, electrical-engineering and related others by exploring similar questions and additional content below.
Similar questions
  • SEE MORE QUESTIONS
Recommended textbooks for you
Power System Analysis and Design (MindTap Course …
Power System Analysis and Design (MindTap Course …
Electrical Engineering
ISBN:
9781305632134
Author:
J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma
Publisher:
Cengage Learning