(a) Calculate the complex power S consumed by this load.
(b) Is this load inductive or capacitive?
(c) Calculate the power factor of this load?
(d) Calculate the reactive power consumed or supplied by this load. Does the load consume reactive
power from t

Electrical Energy Systems
Homework 2
Due: Friday Feb. 26th
Read 1.4, 1.5, 3.1-3.7
1- (10 points) A transformer rated at 1-kVA and 120/240 V has 500 turns of wire on the 120-V side
and 1000 turns of wire on the 240-V side. Suppose that this transformer is

Electrical Energy Systems
Homework 2
Due: Tuesday Feb. 24th
Read 1.4, 1.5, 3.1-3.7
1- (10 points) A transformer rated at 1-kVA and 120/240 V has 500 turns of wire on the 120-V side
and 1000 turns of wire on the 240-V side. Suppose that this transformer is

VH N C + N SE 13.8 kV/ 3
=
=
VL
NC
12.6 kV/ 3
12.6 N C + 12.6 N SE = 13.8 N C
12.6 N SE = 1.2 N C
N C / N SE = 10.5.
ElectricalTherefore,
Energy Systems
(b) The power advantage of this autotransformer is
Homework 3
S IO
=
N C + N SE
=
N C + 10.5N C
= 11.5

Name: ECSE 2960-Exam ll Duration: 120 minutes
1. A 3phase, Y~connected synchronous generator rated at 10kVA, 230V has a synchronous reactance of
1.2 ohm/phase and an armature resistance of 0.5 ohm/phase. When the generator is at full load with
0.8 laggin

ElectricalEnergySystemsHomework3Due:FridayFeb.25th
1- A single-phase two-winding transformer is rated 20kVA, 480/120V, 60Hz. The
equivalent impedance of the transformer referred to the 120V winding, is
Zeqs=0.0525<78.13o . Using the transformer ratings as

Electrical Energy Systems
Homework 1
Due: Friday Feb. 6th
Read book 1.1, 1.2, 1.8, chapter 2.
1234-
(20 points) problem 1-19
(20 points) problem 2-2
(20 points) problem 2-4
(20 points) problem 2-6

Name
RIN No.
ECSE 2110 Exam 2
April 22, 2013, 7:00-9:00pm
Total: 120 points. 110 points for 5 exam questions, 10 points for the formula sheet.
1.
2.
3.
4.
5.
6.
(10 points) Formula sheet (hand in with the exam).
(25 points)
(30 points)
(20 points)
(20 poi

EES Exam 2 Solutions P5 & P6
5. (20 points) A 60Hz three-phase 220 kV transmission line has a length of 60 miles. The
series impedance is 0.25+ j0.7 /mile, and the shunt admittance is 5 10-6 S/mile. The
transmission line supplies 75MW at 0.75 power factor

Name
RIN No.
.
ECSE 2110 Quiz 1
Total: 100 points.
1. (15 points)
2. (15 points)
3. (20 points)
4. (30 points)
5. (20 points)
I declare that I did not receive any help from other people or the Internet for this piece of
independent work, and I did not ref

Electrical Energy Systems
Homework 3
Due: Tuesday Mar 10th.
Read 3.6, 3.9, 3.10
1- (20 points) A 20-kVA 20-kV/480-V 60-Hz transformer is tested with the following results:
Open-circuit test (measured from secondary side): VOC = 480 V, IOC = 1.56 A, POC =

Electrical Energy Systems
Homework 4
Due: Tuesday Mar. 31th
Read 4.1, 4.3, 4.6, 4.7
Read 5.1, 5.4, 5.5, 5.6, 5.8
1- (20 points) A three-phase 11-kV distribution line is connected to a three-phase12.1-kV
distribution line through a three-phase autotransfor

Electrical Energy Systems
Homework 5
Due: Friday Apr. 10
Read 5.9, 5.10, 5.12, 5.13
1-
(20 points) A 6-pole 60-Hz 440-V 100-kW synchronous generator with a synchronous reactance
of Xs=0.8 is operating at rated real power and rated voltage with a power fac

Electrical Energy Systems
Homework 6
Due: Friday Apr. 24th
Read 9.1-9.8
1- (20 points) Solve problem 5-27 of the book.
Note: 1 hp (horse power) 746 watts
2-
(20 points) A 50 km three-phase, 60 Hz transmission line has a per phase series resistance of 2
a

Electrical Energy Systems
Homework 7
Due: Friday May 1st
Read 9.9, Read Chapman 10.1-10.4
1-
(20 points) A three-phase 60 Hz transmission line is 250 mile long. The voltage at the sending
end is 220 kV. The parameters of the line are R=0.2 ohm/mile, X=0.8

Electrical Energy Systems
Homework 8
Due: Tuesday May 12th
Read Chapman 10.1-10.4, Masters 6.1-6.3,6.5,6.8-6.10
1- (20 points) 10-4 of Chapman book.
2- (20 points) 10-7 of Chapman book.
3- (20 points) 6-3 of Masters book.
Consider the following probabilit

Name
RIN No.
.
ECSE 2110 Quiz 2
Total: 50 points.
1. (10 points)
2. (20 points)
3. (20 points)
I declare that I did not receive any help from other people or the Internet for this piece of
independent work, and I did not refer to other sources except for

10-4. Two 4.16 kV threephase synchronous motors are connected to the same bus. The motor ratings are:
Motor 1: 5,000 hp, 0.8 PF lagging. 95% efciency. R = 3%, X5 = 90%
Motor 2: 3000 hp, 1.0 PF, 95% efciency, R = 3%. X5 = 90%
Calculate the perunit impedanc