Determine (boldsymbol{Y}_{text {bus }}) in per unit for the circuit in Problem 7.12. Then invert (boldsymbol{Y}_{text {bus

Question:

Determine \(\boldsymbol{Y}_{\text {bus }}\) in per unit for the circuit in Problem 7.12. Then invert \(\boldsymbol{Y}_{\text {bus }}\) to obtain \(\boldsymbol{Z}_{\text {bus }}\).

Problem 7.12

Equipment ratings for the four-bus power system shown in Figure 7.14 are as follows: 

image text in transcribed

A three-phase short circuit occurs at bus 1, where the prefault voltage is \(525 \mathrm{kV}\). Prefault load current is neglected. Draw the positive-sequence reactance diagram in per unit on a \(1000-\mathrm{MVA}, 20-\mathrm{kV}\) base in the zone of generator G3. Determine

(a) the Thévenin reactance in per unit at the fault,

(b) the subtransient fault current in per unit and in kA rms, and

(c) contributions to the fault current from generator Gl and from line 1-2.

image text in transcribed

Step by Step Answer:

Related Book For  book-img-for-question

Power System Analysis And Design

ISBN: 9781305632134

6th Edition

Authors: J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Question Posted: