Lecture 3
AC Machines Synchronous Generators
EE3PI4 Power Devices and Systems, Chapter 4 (5)
Prof. C. H. Chen
AC Machines
Traditional ac machines fall into one of two
categories: synchronous and induction.
In synchronous machines, rotor-winding currents
The two coils on this core are wound so that their magnetomotive forces are additive, so the total
magnetomotive force on this core is
FTOT N1i1 N 2i2 600 t 0.5 A 200 t 1.00 A 500 A t
Therefore, the magnetizing intensity H is
H
F 500 A t
192 A t/m
2.60 m
Chapter 2: Transformers
2-1.
A 100-kVA 8000/277-V distribution transformer has the following resistances and reactances:
RP 5
RS 0.005
XP 6
X S 0.006
RC 50 k
X M 10 k
The excitation branch impedances are given referred to the high-voltage side of the
Power Devices and Systems - ELEC ENG 3PI4
Department of Electrical and Computer Engineering
McMaster University, Hamilton, Canada
Day Class Dec 1 l, 2006
Duration: 3 hours Dr. B. Szabados
FINAL EXAMINATION
THIS EXAMINATION PAPER INCLUDES 2 PAGES AND 4 Q
EE3PI4 1st MidTerm Examination (2 Pages)
Date & Time: 6:30pm~9:00pm, Monday, February 10, 2014
Note: Q1 to Q4 are all mandatory.
1. (36 Points) Fig. 1 shows a 60 Hz, threephase power system with two loads. The
source is a threephase, con
Lecture 1
Fundamentals of Energy and Power System
EE3PI4 Lecture 1
1
Gravitational Force (F, N)
Any two masses will have attraction (gravity force F) between
them
m1m2
F k 2 m2 g
r
m1
r
m2
(if m 2 is on earth)
F = force attracting two masses, newtons (N)
EE 3PI4 1st MidTerm Exam, 2012 2013, Term 2 (1 Page)
Date & Time: 11:30am~12:20pm, Thursday, February 13, 2013.
Note: Q1 & Q2 are mandatory, and Q3 is a bonus question.
1. (20%) To safely operate a synchronous generator, it should be operated under rat
EE3PI4 2nd MidTerm Examination (2 Pages)
Date & Time: 6:30pm~9:00pm, Friday, March 22, 2013.
Note: Q1 to Q4 are all mandatory. The full score is 60 points
Q.1: (15 Points) A single-phase power system is shown in the Figure 1 below. The power
source fee
Lecture 5
Induction Motors
EE3PI4 Power Devices and Systems, Chapter 6 (7)
Prof. C. H. Chen
The Structure of Three-Phase Motor
The Structure of Three-Phase Motor
1.) The three-phase motor has two main parts - a stationary stator and a
revolving rotor.
EE
Lecture 6
DC Motors
EE3PI4 Power Devices and Systems, Chapter 8 (9)
Prof. C. H. Chen
Operation Principle of DC Motors
IF
IA
The switch between the brushes
and commutators every 180
spatial angle keeps the armature
current IA always flowing into the
bar a
Lecture 2
Three Phase AC Circuits
EE3PI4 Lecture 2
1
Principle Behind - Electromagnetism
Lorentz Force on a Conductor:
1.)When a current-carrying conductor is placed in a magnetic field, it is subject
to a force called electromagnetic (or Lorentz) force
EE3PI4 2nd MidTerm Examination (2 Pages)
Date & Time: 6:30pm~9:00pm, Tuesday, March 17, 2015.
1. (25 Points) Fig. 1 shows a power system consist of a threephase 460V, 60 Hz generator
(ACB sequence) supplying a load through a transmission