King Fahd University Of Petroleum & Minerals
Department of Electrical Engineering
EE-306 Electromechanical Devices
2015-2016 First Semester (151)
INSTRUCTOR
Shafiul Alam, PhD
researcher and
Lecturer-B
Week#
1
2326Aug.
2
30Aug.
2Sep.
OFFICE
Sections
PHONE

3—2 .
{)1
Assuming no armature 1eaction, what is the speed of the motor at full load? “mat is the speed regulation
of the motor?
SOLUTION At full load, the armature current is
V 240 V
—r=110A — — =109A
250Q
I, =r, —r, =1, —R +R
adj F
The internal generate

U!
(c)
A 230-V. 50 HZ. two-pole syncln‘onous motor draws 40 A from the line at tniity power factor and full
load. Assuming that the motor is 10 ssless. answer the following questions:
(a) What is the output torque of this motor? Express the answer both in

4—2.
(a)
A 13.8-kV. SO-IN-IVA. 0.9-power-factor-lagging. 60-Hz. four-pole Y-connected syncln‘onous generator has
a synchronous reactance of 2.5 D. and an almature resistance of 0.2 Q. At 60 Hz. its friction and windage
losses are 1 MW. and its core losses

2—1.
A IUD-kVA SDOO.-"27T-V distribution transformer has the following resistances and reactances:
RP=5§2 33:0.0059
XP=6§1 X5=0.0069
RC=50kﬂ XM=101<Q
The excitation branch impedances are given refen'ed to the high-voltage side of the transformer.
(it) Fin

A-Z. Figure PA-l shows a three-phase power system with two loads. The A-connected generator is producing
a line voltage of 480 V. and the line impedance is 0.09 +j0.16 Q. Load 1 is Y—connected. with a phase
impedance of 2.5.1368?” ﬂ and load 2 is A-connec

1—5. A ferromagnetic core is shown in Figure P1-2. The depth of the core is 5 cm. The other dimensions of
the core are as shown in the figure. Find the value of the cm'rent that will produce a flux of 0.005 “Tb.
With this current, what is the ﬂux density

Three-Phase
Systems
Professor Mohamed A. El-Sharkawi
Voltage or Current
AC Waveform
One
Cycle
Peak
Maximum
Time
El-Sharkawi@University of Washington
2
ac Waveform
v Vmax sin t
2 f
f is the frequency of the waveform
El-Sharkawi@University of Washington
3

Lecture Notes
ELE A6
Ramadan El-Shatshat
Three Phase circuits
9/12/2006
ELE A6 Three-phase Circuits
1
Three-phase Circuits
9/12/2006
ELE A6 Three-phase Circuits
2
Advantages of Three-phase
Circuits
Smooth flow of power (instantaneous power
is constant).

Main Components of Power
Systems
(c) M. A. El-Sharkawi, University of
Washington
1
(c) M. A. El-Sharkawi, University of
Washington
2
Main Components of PS
Power Plant
Turbine
Generator
Transformers
Transmission Lines
Distribution Lines
Protection and C

Homework 2
EE 306: Electromechanical Devices - Semester 161
Problem 1: (a) A magnetic circuit as shown in Figure 1 has the following dimensions:
Ac = 16 cm2, lc = 40 cm, N = 350 turns
The relative permeability of the core is 50000 and the air gap is 0.1 m

KING FAHD UNIVERSITY OF PETROLEUM & MINERALS
ELECTRICAL ENGINEERING DEPARTMENT
Dr. Ibrahim O. Habiballah
EE-360
Quiz 1
ser#:
I.D.:
Key Solution
Name:
A three-phase substation bus supplies two wye-connected loads that are connected in parallel
through a th

Q1)
A single phase electrical load draws 10 MW at 0.6 power factor lagging.
a. Find the real and reactive power absorbed by the load
b. Draw the power triangle.
c. Determine the kVAR of a capacitor to be connected across the load to raise the power factor

EE 306
Electromechanical
Devices
Module 1(Chapter: Appendix B)
Three-Phase AC Circuits
1
Lecture Contents
Introduction
Generation of Three-Phase AC Voltages
& Currents
Voltages and currents in a 3-phase
system
Power relationships in three-phase
system