O_MidTermI

O_MidTermI - Using 138kV as the base voltage for Bus 2 and...

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
The Ohio State University Department of Electrical and Computer Engineering ECE 740  Autumn 2007  Mid Term - I (Optional) November 20, 2007 Name (print) ____________________________________________                                          Notice:  There are 3 problems on the following pages.   Please read the problems carefully. Draw diagrams wherever necessary and show all the steps.  “No aid is given, received or observed”            Signature_____________  Grade____________ _ 1
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Problem # 1: (40 points) A 6-bus power system is shown below –   Generator G1: 50 MVA, 18kV, X d ”=6% Generator G2: 25 MVA, 20kV, X d ”=8% Synchronous Motor M: 50 MVA, 13.8kV, X d ”=5% Transformer T1: 100 MVA, 20kV/138kV, 10% Transformer T2: 25 MVA, 138kV/18kV, 5% Transformer T3: 50 MVA, 138kV/15 kV, 8%
Background image of page 2
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 4
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Background image of page 6
Background image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Using 138kV as the base voltage for Bus 2 and 100 MVA the base MVA value for the entire system, determine per-unit circuit of the system. 2 3 Problem # 2: (20 points) Consider the three-phase system as shown below. 4 Generator G1: X d =10% Generator G2: X d =4% Synchronous Motor M: X d =5% All line impedances given in above figure are in p.u. Find the Y-bus matrix for a) Power flow study b) Short circuit study. Problem # 3: (40 points) A 2-bus power system is shown below: 5 Generator: G1: X d =20% G2: X d =10% If Bus 1 is accidently short-circuited to ground, find the short-circuit current at bus 1. Assume both generators are at their rated voltages before short circuit occurs. 6 7...
View Full Document

This note was uploaded on 07/17/2008 for the course ECE 740 taught by Professor Keyhani during the Fall '07 term at Ohio State.

Page1 / 7

O_MidTermI - Using 138kV as the base voltage for Bus 2 and...

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online