Wilbert Rey D. Tarnate
Instructor
Explain the necessity of transformers in power
systems
Visualize magnetic circuits
Include ideal transformers in circuit analysis
Interpret Transformer Ratings
2
Consider the following single-phase system:
A load consumes
Lecture 9
Outline
Balanced Three-Phase System
Voltages, Currents, and Power in Three-Phase Systems
Balanced Three-Phase Voltages
Three sinusoidal voltages whose amplitudes are
equal and whose phase angles are displaced by
120o are three-phase balanced.
v
Lecture 2a
1
Outline
Ohms Law
Kirchhoffs Current Law
Kirchhoffs Voltage Law
2
Ohms Law
The voltage across a resistor is
proportional to the current thru
it.
v = R i, where R is constant
R is in volts/amperes or ohms
(symbol: )
Applicable to linear resis
Lecture 8
Outline
Instantaneous Power
Real, Reactive, and Apparent Power
Power factor
Complex Power and the Power Triangle
Power Equations
Consider a voltage source, a current source or a network of
passive elements (R, L and/or C).
Let i(t)=Im cos (t+ I)
EEE 3 Lecture 1
EEE 3 Lecture 1
1.
2.
3.
4.
Identify the standard units for basic electrical
quantities
Differentiate basic electrical concepts
Define circuit elements
Identify different parts of a circuit
System of Units
International System of Units (SI
Lecture 5
Linear Elements
Linear element a passive element with linear
voltage-current equation
2
Linear Dependent Sources
Linear dependent source - the controlling
quantity should be proportional only to the first
power of some voltage or current variabl
Lecture 6
Topics
AC Circuit Analysis
Inductors and Capacitors
Phasor Transformation
Phasor Analysis
Real, Reactive, and Complex Power
Single-Phase and Three-Phase Systems
Prerequisites
Knowledge on:
Circuit Analysis Laws, Theorems and Techniques
Ohms Law
TRANSFORMERS
EEE 3 2nd Sem, AY 2011 - 2012
1
OBJECTIVES
Explain the necessity of transformers in power systems
Derive the behavior of ideal transformers from concepts
in electromagnetism
Include ideal transformers in circuit analysis
Interpret Transfo
EEE 3 Exercises - Week 2
Instructions: Use KCL, KVL, and Ohms Law to answer the problems below. This exercise is
good for 45 minutes and should be answered by groups of 3. Write the complete
solutions on sheets of pad papers and box the final answers.
+
V
Lecture 3
1
Outline
Equivalence
Series and Parallel Connection
Voltage and Current Division
Source Transformation
Delta-Wye Transformation
2
Equivalence
Two electric circuits are said to be equivalent with respect
to a pair of terminals if the voltages ac
Overview
(Concepts and Methods for Circuit Analysis)
System of Units
Charge
Current
Voltage
Energy
Power
Circuits
Networks
Parts of a Circuit
Ohms Law
KCL
KVL
Series Equivalence
Parallel Equivalence
Voltage Division
Current Division
Source Transformation
Practice Set 1 Solution Key
Problem # 1:
A. Nodes: 7; Loops: 7; Meshes: 3
B. Correcting the negative voltages and currents by reversing the voltage polarity
and current directions:
+ 2V
DC Machines and Ba.eries
EEE 3 Lecture 05
2
Objec3ves
Include DC generators and DC motors in circuit analysis
Understand the ratings associated with DC Machines
Find the input, output, and lost power in DC Machi
Nodal Analysis
And Mesh Analysis
EEE 3 Lecture 04
2
Objec3ves
Determine currents and voltages in a circuit using Nodal
Analysis
Determine currents and voltages in a circuit using Mesh
Analysis
3
What shall w
Power In AC Circuits
EEE 3 Lecture 9
Objec3ves
De,ine, differentiate, and calculate the
real,
reactive, and
apparent powers
consumed or generated by circuit elements.
Outline
Power in DC vs Power in
Nodal Analysis
And Mesh Analysis
EEE 3 Lecture 04
2
Objec3ves
Determine currents and voltages in a circuit using Nodal
Analysis
Determine currents and voltages in a circuit using Mesh
Analysis
3
What shall w
1
Principle of Equivalence,
Series And Parallel Connection,
Thevenin Equivalent Circuit
EEE 3 Lecture 03
2
Objectives
State the principle of equivalence
Use equivalence to simplify resistors in series and resistors
in parallel.
Apply current and voltag
AC Circuit Analysis (Part 1)
EEE3 Lecture 7
Objec6ves
De,ine the characteristics of sinusoidal AC voltages.
Identify the properties of sinusoids
Identify leading and lagging sinusoids
Visualize how inductors and cap
EEE 3 WFX/WFY Practice Set 1
Problem # 1:
Figure 1 shows a circuit having known and unknown voltages and currents.
E3
3A
E6
E2
E7
7A
+
20V
E4
E1
X
E5
Y
+
5V
EEE 3 Exercises - Week 1
Q1:
Five equipment are connected to each other through conducting wires as shown in the
figure below.
A. Determine which components are absorbing power and which are delivering
power?
B. Is conservation of power satisfied? Explain