1. Served as a Warden for One Year.(1985)

2. Regularization of Stock Registers of various Labs in Dept.of Elect.Engg. by carrying out Stock Transfers.(1985)

3. Served as Staff-in-Charge of Staff TimeTable in Dept.of Elect.Engg. for 5 years.

4. Served as Staff-in-Charge of University Lab Exam Duty Allocation for 2 years.

5. Served as Staff-in-Charge of Consumable Purchase in Dept.of Elect.Engg. for 1 year.

6. Served as a Member, Committee for preparation of Proposal on Center of Excellence in Energy Studies for Funding from UK.

7. Served as a Member, Committee for preparation of Proposal for World Bank Assistance to RECs.

8. Member, Paper Evaluation Committee, ISTE Annual Convention , Dec 1994 at R.E.C., Calicut.

9. Adjudicator, for selecting "Best Paper Presented", ISTE Annual Convention , Dec 1994 at R.E.C.,Calicut.

10. Member, Academic Council for Self Financing Courses, R.E.C., Calicut.

11. Member, UG Project Coordination Committee in Dept.of Elect.Engg. for 3 years.

12. Member, UG Project Evaluation Committee in Dept.of Elect.Engg. for 3 years.

13. Member, Project Proposal Evaluation Committee, Product Development Cell, Department of Training and Placement, R.E.C., Calicut.

14. Member , Evaluation Committee for evaluating project proposals from Staff Members for funding under FRP Scheme of R.E.C., Calicut.

15. Served as Staff-in-Charge of Staff Strength Fixation Calculation as per Madan Committee Norms for the Dept.of Elect.Engg.

16. Member , Committee for setting up "Center for Testing and Certification" in the Department of Training and Placement at NITC - 1999-2000

17. Staff-in-Charge , Power Electronics Laboratory - 1Yr

18. Assistant Professor in Charge of Computerisation of Library for three years - 2000 - 2003. Nalanda Digital Library and Nalanda DL Web Site at NIT Calicut was developed during this period.

19. Member , Campus Networking Committeee - 3 Years - 2000 - 2003

20. Campus Network Technical Administrator - was responsible for the technical aspects of setting up the BSNL 2MBPS Leased Data Line at NIT Calicut , Designing the Network Structure , Configuring Router , Switches and NAT Routers etc. - 2 Years - 2001-2003.

Electric Circuits and Networks - a text book written by Suresh Kumar K S., Asst. Professor, Department of Electrical Engineering, NIT Calicut
Published by Pearson Education ISBN:9788131713907 Pages: 840 Price: Rs. 399

Reference URL

 

ELECTRIC CIRCUITS & NETWORKS

Suresh Kumar K.S

(Pearson Education, ISBN: 9788131713907, Copyright:2008,Pages:840, Price: Rs. 399)

 

PREFACE

The field of Electrical and Electronic Engineering is vast and diverse. However, two topics hold the key to the entire field. They are 'Circuit Theory' and 'Signals and Systems'. Both these topics provide a solid foundation for later learning, as well as for future professional activities.

This undergraduate textbook deals with one of these two pivotal subjects in detail. In addition, it connects 'Circuit Theory' and 'Signals and Systems', thereby preparing the student-reader for a more detailed study of this important subject either concurrently or subsequently.

The theory of Electric Circuits and Networks, a subject derived from a more basic subject of Electromagnetic Fields, is the cornerstone of Electrical and Electronics Engineering. Undergraduates have to learn this subject well, and assimilate its basic concepts in order to become competent engineers.

Objectives of this Book

Primary Objective :-

To serve as a textbook which will meet students' and instructors' need for a two or three semester course on Electrical Circuits and Networks for undergraduate students of 'Electrical and Electronics Engineering (EE)' and 'Electronics and Communications Engineering (EC)' and allied streams. This textbook introduces, explains and reinforces all the basic concepts of analysis of dynamic circuits in time-domain and frequency-domain.

Secondary Objective :-

To use Circuit Theory as a carrier of the fundamentals of Linear System and Continuous Signal Analysis so that the students of EE and EC streams are well-prepared to take up a detailed study of higher level subjects like analog and digital electronics, pulse electronics, analog and digital communication systems, digital signal processing, control systems, and power electronics at a later stage.

 

Electric Circuits in EE and EC Curricula

The subject of Electric Circuits and Networks is currently covered in two courses in Indian technical universities. The introductory portion is covered as a part of a course offered in the first year of undergraduate program. It is usually called 'Basic Electrical Engineering'. About half of the course time is devoted to Introductory Circuit Theory covering the basic principles, DC circuit analysis, circuit theorems and single frequency sinusoidal steady-state analysis using phasor theory. This course is usually a core course for all disciplines. Therefore, it is limited very much in its content and depth as far as topics in circuit theory are concerned. The course is aimed at giving an overview of Electrical Engineering to undergraduate students of all engineering disciplines.

 Students of disciplines other than EE and EC need to be given a brief exposure to Electrical Machines, Industrial Electronics, Power Systems etc., in the third semester. Many universities include this content in the form of a course called "Electrical Technology" in the third semester for students of other engineering disciplines. This approach makes it necessary to teach them AC steady-state analysis of RLC circuits even before they can be told about transient response in such circuits. The EE students, in fact, need AC phasor analysis only from the fourth or fifth semester since they start on Electric Machines and Power Systems only then. But the first year course on basic Electrical Engineering has to be a common course and hence even EE and EC students learn AC steady-state analysis before transient response. Pedagogically it would have been wiser to introduce the student to RC, RL and RLC circuit transients before taking up AC steady-state.

The second course on Circuits is usually administered in the third semester and is termed "Electric Circuit Theory" for EE students and "Circuits and Networks" or "Network Analysis" for EC students. Few comments on these different course titles and course content are in order.

Traditionally, undergraduate Circuit theory courses for EE stream slant towards a "steady-state" approach to teaching circuit theory. The syllabi of many universities in India contain extensive coverage on single-phase and three-phase circuits with the transients in RC and RL circuits postponed to the last module in the syllabus. The course instructor usually finds himself with insufficient contact hours towards the end of the semester to do full justice to this topic. EE stream often orients Circuits courses to serve as prerequisites for courses on electrical machines and power systems. This led to the EC stream preparing a different syllabus for their third semester circuit theory course-one that was expected to orient the student towards the dynamic behaviour of circuits in time-domain and analysis of dynamic behaviour in the frequency domain. But, in practice the syllabus for this subject is an attempt to crowd too many topics from Network Analysis and Synthesis into what should have been a basic course on Circuits.

Such a difference in orientation between the EE-stream syllabus for Circuit theory and EC-stream syllabus for Circuit theory is neither needed nor desirable. The demarcation line between EE and EC has blurred considerably over the last few years. In fact, students of both disciplines need a strong dose of Linear Systems Analysis or Signals and Systems in the third or fourth semester. Unfortunately Linear Systems Analysis has gone out of the curriculum even in those universities which were wise enough to introduce it earlier. And Signals and Systems has started making its appearance in EC curriculum in many universities. But the EE stream is yet to lose its penchant for AC steady-state in many Indian technical universities.

The subject of Electrical Circuit Theory is as "electronic" as it is "electric". Inductors and capacitors do not get scared and behave differently when they see a transistor. Neither do they reach sinusoidal steady-state without going through a transient state just because they happen to be part of a power system or electrical machine.

Against this background, I state the pedagogical viewpoint I have adopted in writing this textbook.

Pedagogical Viewpoint Adopted in this Book

• With a few minor changes in emphasis here and there, both EE and EC students need the same Circuit Theory course.
•  Introducing time-domain response of circuits before AC steady-state response is pedagogically superior. However, curricular constraints make it necessary to introduce AC steady-state analysis first and it is done that way in this book.
• Lumped Linear Electrical Circuits is an ideally suited subject to introduce and reinforce Linear System concepts and Signals and Systems concepts in the EE and EC undergraduate courses. This is especially important in view of shortage of course time which makes it difficult to introduce full-fledged courses in these two subjects. This textbook is organised along the flow of Linear Systems Analysis concepts.
•  Circuit Theory is a very important foundation course for EE, EC and allied disciplines. The quality of teaching and intellectual capability of students varies widely in different sectors of technical educational institutions in India. An important foundation course like this one can not be left to variable quality of teaching. Therefore, a textbook on circuit theory has to explain basic concepts thoroughly and repeatedly, with the average undergraduate students in mind-not the brilliant ones who manage to get into ivy-league institutions. Such a textbook will supplement good teaching in the case of students of premier institutions and, more importantly, save the average students from life-long confusion.
•  The pages of a textbook on Circuit Theory are precious due to the reasons described above. Therefore, all extraneous matter should be dispensed with. The first in this category is the so-called historical vignettes aimed at motivating the students. I have avoided them and instead, used the precious pages to explain basic concepts from different points of view.
• The pre-engineering school curriculum in India prepares the students well in mathematics and physics. Engineering students have not yet become impatient enough to demand examples of practical applications of each and every basic concept introduced in subjects like Circuit Theory or Newtonian Mechanics. There is no need to keep on motivating the student by citing synthetic-looking examples of complex electrical and electronic systems when one is writing on basic topics in Circuit Theory. The pages can be used for providing more detailed explanation on basic concepts. The first year or second year undergraduate student is far away from a practical engineering application! I believe that a typical engineering student is willing to cover the distance patiently.
•  Circuit Theory is a foundation course. It is difficult to quote a practical application for each and every concept without spending considerable number of pages to describe the application and set the background. And the pedagogical impact of this wasteful exercise is doubtful. However, those applications that are within the general information level of an undergraduate student should be included. Thus, applications that require long explanations to fit them into the context must be avoided in the interest of saving pages for explanations on Circuit Theory concepts.
•  Circuit Theory is a basic subject. Therefore, all other topics that the students are going to learn in future semesters will be anchored on it. Hence, it should be possible to set pointers to applications in higher topics in a textbook on Circuit Theory. Such pointers can come in the form of worked examples or end-of-chapter problems that take up an idealized version of some practical application. An example would be to use an idealized form of fly-back switched mode converter and to show how the essential working of this converter can be understood from the inductance v-i relationship. In fact, all well-known switched mode power converter circuits can be employed in the chapter which deals with the v-i relation of an inductor. Similarly, switched-capacitor circuits can be introduced in the section dealing with the v-i relation of a capacitor.
•  Circuit Theory can be learnt well without simulation software. Circuit simulation packages are only tools. I am of the opinion that using simulation software becomes a source of distraction in a foundation course. A foundation course is aimed at flexing the student's intellect in order to encourage the growth of analytical capability in him.
•  An argument usually put forth in support of simulation software as an educational aid is that it helps one to study the response of circuits for various parameter sets and visualize the effect of such variations. That is precisely why I oppose it in a foundation course. Ability to visualize such things using his/her head and his/her ability for mental imagery is very much essential in an engineer. Let the student develop that first. He/she can seek the help of simulation software later when he/she is dealing with a complex circuit that goes beyond the limits of mental imagery.

 After all, we do not include a long chapter on waveform generators and another one on oscilloscopes in every Circuit Theory textbook. In fact, some of the modern-day waveform generators and oscilloscopes have so many features, that a chapter on each of them will not really be out of place. Yet, we do not spend pages of a Circuit Theory textbook for that. The same rule governs simulation software too.

 Pedagogical Features

•  Every chapter begins with a statement of chapter objectives and relative emphasis of topics covered in that chapter.
•  Detailed summary covering all the important points made in the chapter is provided at the end of each chapter.
•  Boxed entries and pointer entries located on the wide side margins highlight important concepts and reinforce them. Additional information is provided within these side-box entries wherever relevant.
•  Large number of solved examples illustrating the concepts explained in the text is included. Simple formula-substitution kind of worked examples are avoided. There are about 250 such worked examples in the book.
•   Numerous questions designed to provoke analytical thinking and to reinforce major concepts is included at the end of chapters. These questions may be short numerical problems or qualitative ones. There are about 270 such questions in the book.
•  Ample number of problems is included at the end of every chapter. Section-wise organisation of these problems is avoided intentionally. I expect the student to understand the entire chapter and use all the concepts covered in that chapter (and from earlier chapters) to solve a problem if necessary. After all, no one tells him which concepts are relevant in solving a particular problem in the examination hall or in practical engineering. There will be about 450 such problems in the book. Answers to all the problems are provided at the end of the book. A detailed solution manual is available at www.pearsoned.co.in/kssureshkumar for the course instructors.

 Outline and Organisation of the Book

The book contains 17 chapters organised in 6 parts. The first three parts are intended to be used for "Basic Electrical Engineering" course in the first year of undergraduate program. The remaining three parts are to be used for "Electric Circuit Theory" for EE students and "Circuits and Networks" or "Network Analysis" for EC and allied disciplines. It may not be possible to cover these three parts entirely in one semester. A selection of suitable sections as per the course requirements will be possible.

Part I of the book -named "Basic Concepts" - contains three chapters. The first chapter goes into the physics of two-terminal circuit elements briefly and deals with element relations, circuit variables, and sign convention. It also addresses the concepts of linearity, time-invariance and bilaterality properties of two-terminal elements. This chapter assumes that the reader has been introduced to the basic physics of electromagnetic fields in pre-engineering high school physics. An attempt to explain the important assumptions underlying Circuit Theory from the point of view of electromagnetic fields has been made in this chapter. The treatment is qualitative and not at all intended to be rigorous.

The second chapter covers the two basic laws ? Kirchhoff?s voltage and current laws ? in detail. Emphasis is placed on the applicability of these two laws under various conditions.

The third chapter looks into the v-i relationship of resistor, inductor and capacitor. Series-parallel equivalents are also covered in this chapter. This chapter analyses the v-i relations of inductor and capacitor in great detail. The concept of ?memory? in circuit elements is introduced in this chapter and the electrical circuits are divided into two classes ? memory-less circuits and circuits with memory. Circuits with memory are termed as Dynamic Circuits from that point onwards.

Part II of the book - named "Analysis of Memory-less Circuits" - contains three chapters. Chapter 4 takes up the analysis of memory-less circuits containing independent voltage and current sources, linear resistors and linear memory-less dependent sources using node analysis and mesh analysis methods. An argument based on nodal admittance matrix (or mesh impedance matrix) and its cofactors is used to show that a memory-less circuit comprising memory-less linear two-terminal elements will be a linear system and that it will obey superposition principle.

The discussion then moves into next chapter which systematically develops all important circuit theorems from the properties of a linear system.

The abstraction called a linear dependent source is given a concrete shape in Chapter 6 by introducing the Operational Amplifier (Opamp) as a memory-less circuit element. However, the reader will be given an introduction to feedback and stability i.e., dynamics of Opamps at this stage itself. This chapter is an optional chapter in the syllabus for "Basic Electrical Engineering". It is a self contained one, which may suitably be shifted to some other course in a higher semester.

After the analysis of memory-less circuits, the book moves on to Part III named "Sinusoidal steady-state in dynamic circuits". This part of the book starts with a detailed look at power and energy in periodic waveforms in Chapter 7. The periodic sinusoid is introduced and the concepts of its amplitude, frequency and phase are made clear. The concept of cycle-average power in the context of periodic waveforms is covered in detail.

Chapter 8 begins with a qualitative description of transient response and forced response taking an RL circuit as an example, and illustrates how the sinusoidal steady-state can be solved by using the complex exponential function. It goes on to expound on phasor theory, transformation of the circuit into phasor domain, solving the circuit in phasor domain, and moving back to time-domain. It also introduces active power, reactive power and power factor and presents the basic ideas of frequency response.

Chapter 9 takes up three-phase balanced and unbalanced circuits and includes symmetrical components too. Unbalanced three-phase circuits and symmetrical components may be optional in "Basic Electrical Engineering" course.

Part IV of the book named "Time-domain analysis of dynamic circuits" contains three chapters. Chapter 10 in this part is one of the key chapters in the book. It takes up a simple RL circuit and uses it as an example system to develop many important linear systems concepts. The complete response of RL circuit to various kinds of inputs like unit impulse, unit step, unit complex exponential, and unit sinusoid is fully delineated from various points of view in this chapter. Further, the need and sufficiency of initial current specification is thoroughly dealt with, and the concepts of time constant, rise and fall times, and bandwidth are clearly explained.

The response of a circuit is viewed as the sum of transient response and forced response on the one hand and as the sum of zero-input response and zero-state response on the other. The role of various response components is clearly spelt out. The application of superposition principle to zero-state component and zero-input component is examined in detail.

Impulse response is shown to be an all-important response of a circuit. The equivalence between impulse excitation and non-zero initial conditions is established in this chapter. The chapter also shows how to derive the zero-state response to other inputs like unit step and unit ramp from impulse response in detail. The tendency of inductance to keep a circuit current smooth is pointed out and illustrated.

The notions of DC steady-state, AC steady-state and periodic steady-state are explained in detail and illustrated through several worked examples. The chapter ends with a general method of solution to single time-constant RL circuits in 'transient response + forced response' format as well as in 'zero-input response + zero-state response' format. This chapter places emphasis on impulse response as the key circuit response, keeping in mind the discussion on convolution integral in a later chapter.

Chapter 11 takes up a similar analysis of RC and RLC circuits. Further, this chapter gradually introduces the concept of sinusoidal steady-state frequency response curves through RC and RLC circuits and sets the background for Fourier series in a later chapter. Specific examples where the excitation is in the form of a sum of harmonically related sinusoids containing three to five terms are used to illustrate the use of frequency response curves and to illustrate linear distortion. The conditions for distortion-free transmission of signals are briefly hinted at in this chapter and taken up for detailed study in a later chapter on Fourier transforms.

Inconvenient circuit problems like shorting a charged capacitor, opening a current carrying inductor, connecting two charged capacitors together, and connecting an uncharged capacitor across a DC supply require inclusion of parasitic elements for correct explanation. Parasitic elements are emphasized at various places in chapters dealing with time-domain analysis.

Chapter 12 extends the differential equation based time-domain analysis to multi-node and multi-mesh circuits containing dependent sources. The issue of stability is brought out through illustrative examples containing dependent sources. The criterion for stability in linear circuits is hinted at and developed fully in later sections.

This chapter generalizes the time-domain approach and introduces the concept of 'signal space'. Every point in the complex signal space is viewed as a possible transient response term of some linear circuit in complex exponential format or as a possible excitation function. The idea that a linear circuit can be represented as a set of points in the signal space is introduced to the reader in this manner. This will be a precursor to pole-zero representation in later chapters.

Impulse response is generalised for an nth order system and circuit stability criterion is translated into absolute summability of impulse response in this chapter. The reader is reminded of the relation between step and ramp responses to impulse response and is prompted to ask the question-can the zero-state response to any arbitrary input be determined from impulse response? The question is answered through the development of expansion of any input signal into a sum of delayed and scaled impulse functions. And convolution integral follows.

Two important results that follow from convolution integral are explained in detail. The first one is the relation between area of impulse response and steady-state value of step response. The second is the frequency response function in terms of impulse response. Once the sinusoidal steady-state frequency response is seen to be completely decided by impulse response, the natural question is raised--can the zero-state response to any arbitrary input be found out using frequency response function? The answer to this question defines what is meant by frequency-domain analysis and makes up Part V of the book.

Part V named "Frequency-domain analysis of dynamic circuits" starts with Chapter 13 that answers the above question for a specific class of inputs -- periodic inputs. This chapter expands a periodic waveform along the imaginary axis in signal space at discrete points. Fourier series in trigonometric and exponential forms are covered in detail in this chapter.

Chapter 14 extends the expansion of input functions along imaginary axis in signal space for aperiodic waveforms through Fourier transforms. It also explains clearly how even periodic waveforms can be brought under Fourier transform theory. The properties of Fourier transforms are explained and illustrated in detail. Significant insight into time-limiting and band-limiting of signals is provided in this chapter. This chapter introduces the notion of a System Function and clearly shows that it is the same as frequency response function. Thereby, it answers the question raised earlier in the affirmative. This chapter introduces the reader to continuous-time signal analysis.

Chapter 15 expands an arbitrary input signal along a line parallel to the vertical axis in a signal plane i.e., in terms of damped sinusoids of different frequencies rather than in terms of undamped sinusoids of different frequencies. This expansion is illustrated graphically in the case of a simple waveshape to convince the reader that an aperiodic signal can indeed be obtained by a large number of exponentially growing sinusoids and that there is nothing special about expansion of a waveshape in terms of undamped sinusoids. This expansion of signals leads to Laplace Transform of the signal. Properties of Laplace Transform, use of Laplace Transform in solving differential equations and circuits, transfer functions, impedance functions, poles, and zeros follow. This chapter also includes a graphical interpretation of frequency response function in the s-plane. Stability criterion is re-visited and Circuit theorems are generalized. This chapter winds up the Part on frequency-domain analysis.

Part VI gives an introduction to Network Analysis and comprises two chapters. Chapter 16 deals with two-port networks and develops various two-port parameter sets. It also deals with passive constant-k and m-derived filter sections for four basic filtering functions. A study of active filters cannot be treated as part of Circuit Theory and is better covered in an analog electronics course. Hence it is not included as text material. However, standard active filter circuits are included in worked examples and problems in earlier chapters dealing with frequency response studies.

Chapter 17 provides an introduction to the study of topological properties of electrical networks. The reader is taken through an introduction to linear graphs, incidence matrix, circuit matrix and cut-set matrix and KCL/KVL equations in terms of topological matrices followed by nodal analysis, loop analysis and node-pair analysis of networks. This chapter and the book end with a brief exposure to Tellegen?s theorem.

Prerequisites for Students

The student-reader is expected to have gone through basic level courses in electromagnetism, complex algebra, differential calculus and integral calculus. These are covered in the pre-engineering school curricula of all boards of senior/higher secondary school education in India.

Material for Further Study

The following books may be used as reference material for gaining further insight into the subject.

[1] William H. Hayt, Jr. And Jack E. Kemmerly, Engineering Circuit Analysis, New York: McGraw-Hill, 1962

[2] M. E. Van Valkenburg, Network Analysis, PHI, 1974

[3] K V V Murthy, M S Kamath, Basic Circuit Analysis, Tata McGraw-Hill Publishing Company, 1989

[4] Charles A. Desoer, Ernest S. Kuh, Basic Circuit Theory, New York: McGraw-Hill, 1962

[5] Ernst A. Guillemin, Introductory Circuit Theory, New York: Wiley, 1953

[6] Ernst A. Guillemin, The Mathematics of Circuit Analysis, New York: Wiley, 1949

[7] N. Balbanian, T. A. Bickart, Electric Network Theory, New York: Wiley, 1969

To the Engineering Teacher

This is my first book. I have tried to minimise errors as far as possible. However, there may be a few that escaped my attention. I request you to point out them to me so that I can incorporate suitable corrections in the future impressions of this book.

I would be grateful to you for any suggestion to improve the content or presentation of this book. Please send your suggestions directly to me at sureshks@nitc.ac.in or to the publisher.

Acknowledgements

I thank the National Institute of Technology, Calicut, India for granting me a one-year sabbatical during the academic year 2006-07. A major portion of manuscript for this textbook was prepared during this period.

I gratefully acknowledge the constant encouragement I received from my friends and colleagues from the Department of Electrical Engineering and the Department of Electronics and Communication at the National Institute of Technology Calicut, India. It has been my good fortune to be looked upon by friends and colleagues with great esteem over the last 25 years I have spent at NIT Calicut. Thank you Dr. Paul Joseph K, Dr. G. Abhilash, Dr. Saly George, Dr. Susy Thomas, Dr. Jeevomma Jacob, Dr. S. Ashok, Mr. P. Ananthakrishnan, Dr. Sreeram Kumar R, Dr. Abraham T Mathew, Mr. K. Saseendran, Dr. Nanda Kumar M.P, Dr. T. L. Jose, Dr. K. P. Mohandas, Dr. Mathew Varghese Vaidyan, Dr. P. P. Gervadis, Dr. P. C. Baby, Dr. N. Prabhakaran? I wish I could include all the names...the list will be too long. Thank you all for your support.

I learnt electric circuits and networks as an undergraduate at Indian Institute of Technology Madras, Chennai during the period 1976-?81. The credit for the good things the reader finds in this book goes to my esteemed professors ? Dr. Venkataseshaiah, Dr. V. Bappeswara Rao, Dr. P. Sankaran, Dr. M. Anthony Reddy, Dr. S. S. Yegnanarayanan, Dr. K. Ramar, Dr. G. Sreedhara Rao, Dr. B. Venugopal and Dr. R. Parthasarathy who taught me well. The faults, if any, in this book are mine.

I am indeed fortunate that my wife, Asha D, and my three children -- Gayathri S, Gautham Suresh and Archana Suresh -- allow me considerable personal space that is very much essential for a venture like writing a textbook. I couldn?t have written this book if they had not allowed me to be myself (with all my imperfections) over the past years.

Suresh Kumar K.S

National Institute of Technology Calicut

 

DETAILED TABLE OF CONTENTS

 

PART ONE - Basic Concepts

Chapter 1 : Circuit Variables and Circuit Elements

Introduction

1.1 Electromotive Force, Potential and Voltage

Force between two moving point charges and retardation effect

Electric Potential and Voltage

Electromotive Force and Terminal Voltage of a Steady Source

1.2 A Voltage Source with a Resistance Connected at its Terminals

Steady-state Charge Distribution in the System

Drift Velocity and Current Density

Current Intensity

Conduction and Energy Transfer Process

Two-terminal Resistance Element

A Time-varying Voltage Source with Resistance Across it

1.3 Two-terminal Capacitance

1.4 Two-terminal Inductance

Induced electromotive force and its location in a circuit

Relation between induced electromotive force and current

Farady?s Law and Induced electromotive force

The issue of a unique voltage across a two-terminal element

The Two-terminal Inductance

1.5 Ideal Independent Two-terminal Electrical Sources

Ideal Independent Voltage Source

Ideal Independent Current Source

Ideal short-circuit element and Ideal open-circuit element

1.6 Power and Energy Relations for Two-terminal Elements

Passive Sign Convention

Power and Energy in Two-terminal Elements

1.7 Classification of Two-terminal Elements

Lumped and Distributed Elements

Linear and Nonlinear Elements

Bilateral and Non-bilateral Elements

Passive and Active Elements

Time-Invariant and Time-Variant Elements

1.8 Multi-terminal Circuit Elements

Mutual Inductance Element

Why should M12 be equal to M21 ?

Ideal Dependent Sources

1.9 Summary

1.10 Problems

 

Chapter 2 : Basic Circuit Laws

Introduction

2.1 Kirchhoff's Voltage Law (KVL)

2.2 Kirchhoff's Current Law

2.3 Interconnections of Ideal Sources

2.4 Analysis of a Single-loop Circuit

2.5 Analysis of a Single-Node-Pair Circuit

2.6 Analysis of Multi-loop, Multi-node Circuits

2.7 Summary

2.8 Problems

 

Chapter 3 : Single Element Circuits

Introduction

3.1 The Resistor

Series Connection of Resistors

Parallel Connection of Resistors

3.2 The Inductor

Instantaneous Inductor Current vs. Instantaneous Inductor Voltage

Change in Inductor Current Function vs. Area under Voltage Function

Average Applied Voltage for a Given Change in Inductor Current

Instantaneous Change in Inductor Current

Inductor with Alternating Voltage Across it

Inductor with Exponential and Sinusoidal Voltage Input

Linearity of Inductor

Energy Storage in an Inductor

3.3 Series Connection of Inductors

Series Connection of Inductors with Same Initial Current

Series Connection with Unequal Initial Currents

3.4 Parallel Connection of Inductors

Parallel Connection of Initially Relaxed Inductors

Parallel Connection of Inductors with Initial Energy

3.5 The Capacitor

3.6 Series Connection of Capacitors

Series Connection of Capacitors with Zero Initial Energy

Series Connection of Capacitors with Non-zero Initial Energy

3.7 Parallel Connection of Capacitors

3.8 Summary

3.9 Questions

3.10 Problems

 

PART TWO - Analysis of Memoryless Circuits

Chapter 4 : Nodal Analysis and Mesh Analysis of Memoryless Circuits

Introduction

4.1 The Circuit Analysis Problem

4.2 Nodal Analysis of Circuits Containing Resistors and Independent Current Sources

4.3 Nodal Analysis of Circuits Containing Independent Voltage Sources

4.4 Source Transformation Theorem and its Use in Nodal Analysis

Source Transformation Theorem

Applying Source Transformation in Nodal Analysis of Circuits

4.5 Nodal Analysis of Circuits Containing Dependent Current Sources

4.6 Nodal Analysis of Circuits Containing Dependent Voltage Sources

4.7 Mesh Analysis of Circuits with Resistors and Independent Voltage Sources

Principle of Mesh Analysis

Is Mesh Current Measurable?

4.8 Mesh Analysis of Circuits with Independent Current Sources

4.9 Mesh Analysis of Circuits Containing Dependent Sources

4.10 Summary

4.11 Problems

Chapter 5: Circuit Theorems

Introduction

5.1 Linearity of a Circuit and Superposition Theorem

Linearity of a Circuit

5.2 Star-Delta Transformation Theorem

5.3 Substitution Theorem

5.4 Compensation Theorem

5.5 Thevenin's Theorem and Norton's Theorem

5.6 Determination of Equivalents for Circuits with Dependent Sources

5.7 Reciprocity Theorem

5.8 Maximum Power Transfer Theorem

5.9 Millman's Theorem

5.10 Summary

5.11 Problems

 

Chapter 6 : The Operational Amplifier as a Circuit Element

Introduction

6.1 Ideal Amplifiers and Their Features

Ground in Electronic Amplifiers

6.2 The Role of DC Power Supply in Amplifiers

Linear Amplification in Electronic Amplifiers

Large Signal Operation of Amplifiers

Output Limits in Amplifiers

6.3 The Operational Amplifier

The Practical Operational Amplifier

6.4 Negative Feedback in Operational Amplifier Circuits

6.5 The Principles of 'Virtual Short' and 'Zero Input Current'

6.6 Analysis of Operational Amplifier Circuits Using the IOA Model

The Non-Inverting Amplifier Circuit

The Voltage Follower Circuit

The Inverting Amplifier Circuit

The Inverting Summer

The Non-Inverting Summer Amplifier

The Subtractor Circuit

The Instrumentation Amplifier

Voltage to Current Converters

6.7 Offset Model for an Operational Amplifier

6.8 Effect of Non-ideal Properties of Opamp on Circuit Performance

6.9 Summary

6.10 Questions

6.11 Problems

 

 

PART THREE - Sinusoidal Steady-State in Dynamic Circuits

Chapter 7 : Power and Energy in Periodic Waveforms

Introduction

7.1 Why Sinusoids?

7.2 The Sinusoidal Source Function

Amplitude, Period, Cyclic Frequency, Angular Frequency

Phase of a Sinusoidal Waveform

Phase Difference Between Two Sinusoids

Lag or Lead?

Phase Lag/Lead versus Time Delay/Advance

7.3 Instantaneous Power in Periodic Waveforms

7.4 Average Power in Periodic Waveforms

7.5 Effective Value (RMS Value) of Periodic Waveforms

RMS Value of Sinusoidal Waveforms

7.6 The Power Superposition Principle

RMS Value of a Composite Waveform

7.7 Summary

7.8 Questions

7.9 Problems

 

 

Chapter 8 : The Sinusoidal Steady-State Response

Introduction

8.1 Transient State and Steady-State in Circuits

Governing Differential Equation of Circuits ? Examples

Solution of the Circuit Differential Equation

Complete Response with Sinusoidal Excitation

8.2 The Complex Exponential Forcing Function

Sinusoidal Steady-State Response from Response to ejw t

Steady-State Solution to ejw t and the jw Operator

8.3 Sinusoidal Steady-State Response Using Complex Exponential Input

8.4 The Phasor Concept

Kirchhoff?s Laws in terms of Complex Amplitudes

Element Relations in terms of Complex Amplitudes

The Phasor

8.5 Transforming a Circuit into Phasor Equivalent Circuit

Phasor Impedance, Phasor Admittance and Phasor Equivalent Circuit

8.6 Sinusoidal Steady-State Response from Phasor Equivalent Circuit

Comparison between Memoryless Circuits and Phasor Equivalent Circuits

Nodal Analysis and Mesh Analysis of Phasor Equivalent Circuits ? Examples

8.7 Circuit Theorems in Sinusoidal Steady-State Analysis

Maximum Power Transfer Theorem for Sinusoidal Steady-State Condition

8.8 Phasor Diagrams

8.9 Apparent Power, Active Power, Reactive Power and Power Factor

Active and Reactive Components of Current Phasor

Reactive Power and the Power Triangle

8.10 Complex Power under Sinusoidal Steady-State Condition

8.11 Sinusoidal Steady-State in Circuits with Coupled Coils

Dot Polarity Convention

Maximum Value of Mutual Inductance and Coupling Coefficient

A Two-Winding Transformer ? Equivalent Models

The Perfectly Coupled Transformer and The Ideal Transformer

8.12 Summary

8.13 Questions

8.14 Problems

 

Chapter 9 : Sinusoidal Steady-State in Three-Phase Circuits

Introduction

9.1 Three-Phase System Versus Single-Phase System

9.2 Three-Phase Sources and Three-Phase Power

The Y-connected Source

The D -connected Source

9.3 Analysis of Balanced Three-Phase Circuits

Equivalence between a Y-connected Source and a D -connected Source

Equivalence between a Y-connected Load and a D -connected Load

The Single-Phase Equivalent Circuit for a Balanced Three-Phase Circuit

9.4 Analysis of Unbalanced Three-Phase Circuits

Unbalanced Y-Y Circuit

Circulating Current in Unbalanced Delta-connected Sources

9.5 Symmetrical Components

Three-Phase Circuits with Unbalanced Sources and Balanced Loads

The Zero Sequence Component

Active Power in Sequence Components

Three-Phase Circuits with Balanced Sources and Unbalanced Loads

9.6 Summary

9.7 Questions

9.8 Problems

 

PART FOUR - Time-Domain Analysis of Dynamic Circuits

Chapter 10 : Simple RL Circuits in Time-Domain

Introduction

10.1 The Series RL Circuit

The Series RL Circuit Equations

Need for Initial Condition Specification

Sufficiency of Initial Condition

10.2 Series RL Circuit with Unit Step Input - Qualitative Analysis

From t = 0- to t = 0+

Inductor Current Growth Process

10.3 Series RL Circuit with Unit Step Input ? Power Series Solution

Series RL Circuit Current as a Power Series

10.4 Step Response of RL Circuit by Solving Differential Equation

Interpreting the Input Forcing Functions in Circuit Differential Equations

Solving the Series RL Circuit Equation by Integrating Factor Method

Complementary Function and Particular Integral

10.5 Features of RL Circuit Step Response

Step Response Waveforms in Series RL Circuit

The Time Constant ?t ? of a Series RL Circuit

Rise Time and Fall Time in First Order Circuits

Effect of Non-Zero Initial Condition on Step Response of RL Circuit

Free Response of Series RL Circuit

10.6 Steady-State Response and Forced Response

The DC Steady-State

The Sinusoidal Steady-State

The Periodic Steady-State

10.7 Linearity and Superposition Principle in Dynamic Circuits

10.8 Unit Impulse Response of Series RL Circuit

Unit Impulse Response of RL Circuit with Non-Zero Initial Current

Zero-State Response for Other Inputs from Zero-State Impulse Response

10.9 Series RL Circuit with Exponential Inputs

Zero-State Response for Real Exponential Input

Zero-State Response for Sinusoidal Input

10.10 General Analysis Procedure for Single Time Constant RL Circuits

10.11 Summary

10.12 Questions

10.13 Problems

 

Chapter 11 : RC and RLC Circuits in Time-Domain

Introduction

11.1 RC Circuit Equations

11.2 Zero-Input Response of RC Circuit

11.3 Zero-State Response of RC Circuits for Various Inputs

Impulse Response of First-Order RC Circuits

Step Response of First-Order RC Circuits

Ramp Response of Series RC Circuit

Series RC Circuit with Real Exponential Input

Zero-State Response of Parallel RC Circuit for Sinusoidal Input

11.4 Periodic Steady-State in a Series RC Circuit

11.5 Sinusoidal Steady-State Frequency Response of First Order RC Circuits

The Use of Frequency Response

Frequency Response and Linear Distortion

Jean Baptiste Joseph Fourier and Frequency Response

First-Order RC Circuits as Averaging Circuits

Capacitor as a Signal Coupling Element

Parallel RC Circuit for Signal Bypassing

11.6 The Series RLC Circuit - Zero-Input Response

Source-free Response of Series RLC Circuit

Case-1 a 1 and a 2 real, negative and distinct

Case-2 a 1 and a 2 real, negative and equal

Case-3 a 1 and a 2 complex and conjugates with negative real parts

The Series LC Circuit ? A Special Case

The Series LC Circuit with Small Damping ? Another Special Case

Standard Formats for Second-Order Circuit Zero-Input Response

11.7 Impulse Response of Series RLC Circuit

11.8 Step Response of Series RLC Circuit

11.9 Standard Time-Domain Specifications for Second-Order Circuits

11.10 Examples on Impulse and Step Response of Series RLC Circuits

11.11 Frequency Response of Series RLC Circuit

Sinusoidal Forced-Response from Differential Equation

Frequency Response from Phasor Equivalent Circuit

Qualitative Discussion on Frequency Response of Series RLC Circuit

A More Detailed Look at the Band-pass Output of Series RLC Circuit

Quality Factor of Inductor and Capacitor

11.12 The Parallel RLC Circuit

Zero-Input Response and Zero-State Response of Parallel RLC Circuit

Sinusoidal Steady-State Frequency Response of Parallel RLC Circuit

11.13 Summary

11.14 Questions

11.15 Problems

 

Chapter 12 : Higher Order Circuits in Time-Domain

Introduction

12.1 Analysis of Multi-mesh and Multi-node Dynamic Circuits

12.2 Generalisations for an nth Order Linear Time-Invariant Circuit

12.3 Time-Domain Convolution Integral

Zero-State Response to Narrow Rectangular Pulse Input

Expansion of an Arbitrary Input Function in Terms of Impulse Functions

The Convolution Integral

Graphical Interpretation of Convolution in Time-Domain

Frequency Response Function from Convolution Integral

A Circuit with Multiple Sources ? Applying Convolution Integral

Zero-Input Response by Convolution Integral

12.4 Summary

12.5 Questions

12.6 Problems

 

 

PART FIVE - Frequency Domain Analysis of Dynamic Circuits

 

Chapter 13 : Dynamic Circuits with Periodic Input - Analysis by Fourier Series

Introduction

13.1 Periodic Waveforms in Circuit Analysis

13.2 The Exponential Fourier Series

13.3 Trigonometric Fourier Series

13.4 Conditions for Existence of Fourier Series

13.5 Waveform Symmetry and Fourier Series Coefficients

13.6 Properties of Fourier Series and Some Examples

13.7 Discrete Magnitude and Phase Spectrum

13.8 Rate of Decay of Harmonic Amplitude

13.9 Analysis of Periodic Steady-State Using Fourier Series

13.10 Normalised Power in a Periodic Waveform and Parseval's Theorem

13.11 Power and Power Factor in AC System with Distorted Waveforms

13.12 Summary

13.13 Questions

13.14 Problems

 

Chapter 14 : Dynamic Circuits with Aperiodic Inputs - Analysis by Fourier Transforms

Introduction

14.1 Aperiodic Waveforms

Finite-duration aperiodic signal as one period of a periodic waveform

14.2 Fourier Transform of an Aperiodic Waveform

Fourier Transform of a Finite-Duration Aperiodic Waveform

Fourier Transform of Infinite-Duration Aperiodic Waveforms

Interpretation of Fourier Transforms

14.3 Convergence of Fourier Transforms

14.4 Some Basic Properties of Fourier Transforms

Linearity of Fourier Transform

Duality in Fourier Transform

Time Reversal Property

Time Shifting Property

14.5 Symmetry Properties of Fourier Transforms

Conjugate Symmetry Property

Fourier Transform of an Even Time-Function

Fourier Transform of an Odd Time-Function

Fourier Transforms of Even Part and Odd Part of a Real Time-Function

v(0) and V(j0)

14.6 Time-Scaling Property and Fourier Transform of Impulse Function

Compressing a Triangular Pulse in Time-Domain with its Area-Content Constant

14.7 Fourier Transforms of Periodic Waveforms

14.8 Fourier Transforms of Some Semi-Infinite Duration Waveforms

Fourier transform of e-a t u(t)

Fourier Transform of Signum Function

Fourier Transform of Unit Step Function

Fourier Transform of Functions of the Form

14.9 Zero-State Response by Frequency-Domain Analysis

Why Should the System Function and Frequency Response Function be the Same?

14.10 The System Function and Signal Distortion

The Signal Transmission Context

Linear Distortion in Signal Transmission Context

Pulse Distortion in First Order Channels

14.11 Parseval's Relation for a Finite-Energy Waveform

14.12 Summary

14.13 Questions

14.14 Problems

 

Chapter 15 : Analysis of Dynamic Circuits by Laplace Transforms

Introduction

15.1 Circuit Response to Complex Exponential Input

15.2 Expansion of a Signal in terms of Complex Exponential Functions

Interpretation of Lapalce Transform

15.3 Laplace Transforms of Some Common Right-Sided Functions

15.4 The s-Domain System Function H(s)

15.5 Poles and Zeros of System Function and Excitation Function

15.6 Method of Partial Fractions for Inverting Laplace Transforms

15.7 Some Theorems on Laplace Transforms

Time-shifting Theorem

Frequency-shifting Theorem

Time-Differentiation Theorem

Time-Integration Theorem

s-Domain-Differentiation Theorem

s-Domain-Integration Theorem

Convolution Theorem

Initial Value Theorem

Final Value Theorem

15.8 Solution of Differential Equations by Using Laplace Transforms

15.9 The s-Domain Equivalent Circuit

s-Domain Equivalents of Circuit Elements

15.10 Total Response of Circuits Using s-Domain Equivalent Circuit

15.11 Network Functions and Pole-Zero Plots

Driving-point Functions and Transfer Functions

The Three Interpretations for a Network Function H(s)

Poles and Zeros of H(s) and Natural Frequencies of the Circuit

Specifying a Network Function

15.12 Impulse Response of Network Functions from Pole-Zero Plots

15.13 Sinusoidal Steady-State Frequency Response from Pole-Zero Plots

Three interpretations for H(jw )

Frequency Response from Pole-Zero Plot

15.14 Analysis of Coupled Coils Using Lapalce Transforms

Input Impedance Function and Transfer Function of a Two-Winding Transformer

Flux Expulsion by a Shorted Coil

Breaking the Primary Current in a Transformer

15.15 Summary

15.16 Problems

 

PART SIX - Introduction to Network Analysis

Chapter 16 : Two-Port Networks and Passive Filters

Introduction

16.1 Describing Equations and Parameter Sets for Two-Port Networks

Short-Circuit Admittance Parameters for a Two-Port Network

Open-Circuit Impedance Parameters for a Two-Port Network

Hybrid Parameters and Inverse-Hybrid Parameters for a Two-Port Network

16.2 Equivalent Circuits for a Two-Port Network

16.3 Transmission Parameters (ABCD Parameters) of a Two-Port Network

16.4 Interrelationships Between Various Parameter Sets

16.5 Interconnections of Two-Port Networks

16.6 Reciprocity and Symmetry in Two-Port Networks

16.7 Standard Symmetric T and P Equivalents

16.8 Image Parameter Description of a Reciprocal Two-Port Network

Image Parameters for a Symmetric Reciprocal Two-Port Network

Image Parameters in terms of Open-Circuit and Short-Circuit Impedances

16.9 Zo and g of Symmetric T and Networks Under Sinusoidal Steady-State

Attenuation Constant and Phase Constant

16.10 Constant-k Low-pass Filter

Ideal Low-pass Filter Versus Constant-k Low-pass Filter

Prototype Low-pass Filter Design

16.11 m-Derived Low-pass Filter Sections for Improved Attenuation

16.12 m-Derived Half-Sections for Filter Termination

m-Derived Half Sections for Input Termination

Half-P Termination Sections for P -Section Filters

16.13 Constant-k and m-Derived High-Pass Filters

Design Equations for Prototype High-Pass Filter

m-Derived Sections for Infinite Attenuation

Termination Sections for High-Pass Filter

16.14 Constant-k Band-Pass Filter

Design Equations of Prototype Band-Pass Filter

16.15 Constant-k Band-Stop Filter

16.16 Resistive Attenuators

Attenuation provided by a Symmetric Resistive Attenuator

The Symmetrical T-Section Attenuator

The Symmetrical P -Section Attenuator

The Symmetrical Lattice-Section Attenuator

The Symmetrical Bridged T-Section Attenuator

Asymmetrical T-Section and P -Section Attenuators

16.17 Summary

16.18 Questions

16.19 Problems

Chapter 17 : Introduction to Network Topology

Introduction

17.1 Linear Oriented Graphs

Connected Graph, Subgraphs and Some Special Subgraphs

17.2 The Incidence Matrix of a Linear Oriented Graph

Path Matrix and its relation to Incidence Matrix

17.3 Kirchhoff's Laws in Incidence Matrix Formulation

KCL Equations from A matrix

KVL Equations and the A matrix

17.4 Nodal Analysis of Networks

The principle of v-shift

Nodal Analysis of Networks Containing Ideal Dependent Sources

17.5 The Circuit Matrix of a Linear Oriented Graph

The Fundamental Circuit Matrix Bf

Relation between All Incidence Matrix Aa and All Circuit Matrix Ba

17.6 Kirchhoff's Laws in Fundamental Circuit Matrix Formulation

Kirchhoff?s Voltage Law and the Bf Matrix

Kirchhoff?s Current Law and the Bf Matrix

17.7 Loop Analysis of Electrical Networks

The principle of i-shift

Loop Analysis of Networks Containing Ideal Dependent Sources

Planar Graphs and Mesh Analysis

Duality

17.8 The Cut-set Matrix of a Linear Oriented Graph

Cut-sets

The All cut-set matrix Qa

Orthogonality relation between Cut-set matrix and Circuit matrix

The Fundamental Cut-set Matrix Qf

Relation between Qf , A and Bf

17.9 Kirchhoff's Laws in Fundamental Cut-set Formulation

Kirchhoff?s Current Law and the Qf Matrix

Kirchhoff?s Voltage Law and the Qf Matrix

17.10 Node-Pair Analysis of Networks

Node-pair Analysis of Networks Containing Ideal Dependent Sources

17.11 Analysis Using Generalized Branch Model

Node Analysis

Loop Analysis

Node-pair Analysis

17.12 Tellegen's Theorem

17.13 Summary

17.14 Problems

Answers to Problems

Index

1. "Introduction to Computer and Utility Packages" for Engineers from K.S.E.B, Calicut at Calicut from 1-7-1991 to 11-8-1991.

2. A Four Module (60 hrs) Training Course in Electrical Engineering at M/s GRASIM , Mavoor.

Module I -- "Electric motor Selection , Control and Maintenance"
12-18 Dec 1991

Module II -- "Plant Power Distribution Engineering I"
24-28 Feb 1992

Module III -- "Plant Power Distribution Engineering II"
6-10 July 1992

Module IV -- "Testing , Commissioning and Protection"
22-28 Sep 1992

3. REC-CII Short Term Course on 'Electrical Energy Auditing and Conservation' offered to Engine

1. MODERNISATION OF UG LABS -- 1984-88

Handled procurement of various equipment for Electrical Machines Lab, Electrical Measurements Lab and Control Systems Lab in the Department of Electrical Engineering. Responsibilities included drawing up requirements and specifications , inviting quotations/tenders, technical evaluation of the bids received, testing and certifying the equipment received etc.
The equipment involved were various kinds of Electrical Measuring Instruments, Rheostats, Loading Rheostats, Electrical Machines, Electronic Equipment , Oscilloscope etc.

2. POWER ELECTRONICS LAB UNDER NETWORK SCHEME 1984-89

Handled the procurement of various Electronic Instruments , Electronic Components , Power Components like Thyristors, Diodes and Heat Sinks ,Electrical Machines etc. for Power Electronics Lab.

3. POWER SYSTEM PROTECTION LAB UNDER NETWORK SCHEME -- 1985-1990

Carried out the procurement of various Electronic Equipment, AC Network Analyzer , DC Network Analyzer etc. for this Lab.

4. ELECTRICAL MAINTENANCE UNIT.

Was actively involved in tendering, evaluating the bids and commissioning of the 250 kVA DG Set for the Campus Standby Supply along with Dr.Gervadis, Professor, Dept.of Elect.Engg.

5. ENERGY AUDIT CELL.

R.E.C.,Calicut had sanctioned Rs.20 Lakhs for setting up an Energy Laboratory in the Dept. Of Elect. Engg under Special Equipment Fund in Center of Excellence Scheme. The aim of this Lab is to promote the already existing Energy Audit activities and to generate Energy Related Consultancy.
I am in-charge of this Laboratory. The equipment in this Cell include Single Phase Energy Analyzers, Three Phase Energy Analyzers, Three Phase Harmonic Analyzer, Digital Clamp-on Audit Meters, Lux Meters, Portable Handheld Oscilloscope, Hall Effect Current probes, EDA Software , Power Distribution System Analysis Software, Power System Harmonic Analysis Software ,Power System Data Logger etc.

6. DEPARTMENTAL PG COMPUTER CENTER

A Windows LAN with about 20 nodes for the exclusive use of PG Students in the Department with Matlab , Orcad , Microsim PSpice , Power System Software etc.The Center also runs a Intranet Web Site for the Students of the Department.

7. CENTER FOR TESTING AND CETIFICATION

Was a member in the committee responsible for setting up this Center under Department of Training and Placement. Was involved in equipment selection , procurement and testing.

Power Electronics -

Active Power Factor Correction

Uninterruptible Power Supplies

Active Harmonic Filtering

Static Var Compensation

Power Quality Conditioners

FACTS Devices

DSP in Power Electronics

a) Consultancy Work Carried out Under Energy Audit Cell.

Energy Audit Cell in the Dept. of Elect. Engg.,NITC,constituted in 1993 was recognised as an Accredited Energy Auditor (AEA) to Govt. Of Kerala in Nov 1993. I was actively involved in the formation of Energy Audit Cell and I have been acting as the Convener of Energy Audit Cell since its formation in 1993.

As Convener of Energy Audit Cell , I developed a system of evaluating the audit work content of an Industrial Plant from a set of preliminary data supplied by the firm. A set of rules were framed to arrive at Audit Fee based on the work content estimated thereby.

Also, it was Conveners responsibility to arrive at guidelines for audit procedures , discussion formats, remuneration distribution etc.

I was actively involved in 28 of these Audit assignments and functioned as Coordinator of the Audit Team for all these.

The list of firms where I have been involved in conducting Energy Audit (Data Collection, Measurements , Analysis, Report Preparation etc.) is given below.

1.M/s The Pharmaceutical Corporation , Trissur.
2.M/s Thirumbadi Rubber Company,Calicut.
3.M/s L.I.C of India ,Calicut.(in 1993).
4.M/s Apsara Theatres,Calicut.
5.M/s Malabar Crumb rubber Factory,Calicut.
6.M/s Valluvanad Hospital,Ottapalam.
7.M/s CWRDM,Calicut.
8.M/s Pullangode Rubber Company,Kalikavu.
9.M/s The Cooperative Sugar Mills,Chittur,Palghat.
10.M/s Kamala International,Kannoor.
11.M/s Sri Chamundeswari Sugars Ltd.,Calicut.
12.M/s Hindustan Lever Ltd.,Calicut.
13.M/sCalicut University Campus,Calicut.
14.M/s Califer Polymers Ltd.,Calicut.
15.M/s Sijmak Oils Ltd.,Calicut.
16.M/s Soubagyam Food Industries,Calicut.
17.M/s Nirmala Hospital, Calicut.
18.M/s Cherupara Bricks&Metals Ltd.,Calicut.
19.M/s L.I.C of India,Calicut(in 1997).
20.M/s Indian Oil Corporation,Calicut.
21. M/s Hotel Regency,Calicut
22. M/s Seventh Day Adventist Hospital,Ottapalam.
23. M/s Miracle Rubber Company,Perinthalmanna.
24. M/s Miracle Elastomer (India) Ltd.,Perinthalmanna.
25. M/s The Pharmaceutical Corporation,Thissur.( in 1998)
26. M/s St.Vincent Industries,Calicut
27. M/s CEDT, Chathamangalam , Calicut
28. M/s Pullangode Rubber Produce&Company, Kalikave (in 2002)

 

b) Other Consultancy Assignments Carried Out.

(i) Fractional Horse Power Motor Reengineering Project for M/s INDAL,Kalamassery in 1995.

(ii) Motor Loading Studies for M/s Hindustan Lever Ltd.,Calicut in 1996.

(iii) Diagnostic Testing of 125 kVA DG Set for M/s P.V.S. Hospital, Calicut in 1997.

(iv) Power Quality Testing of Electronic Chokes for IRTC , Palghat in 1999

(v) Power System Harmonic Studies at two Telephone Exchanges at Calicut for BSNL, India - 2000

(vi) Battery AH Testing for M/s Radiant Batteries , Calicut - 2000

(vii) Scrutiny of Electrical Distribution System Design at IIM Kozhikode - 2000

(viii) Testing of Voltage Stabilisers for M/s Kidson Electronics, Calicut - 2001

(ix) Power System Harmonic Study at M/s Rohini Plasto Works , Calicut in 2002

c) Retainer Consultancy Work.

V Guard Industries , Cochin - 1996-99

d) UPS Testing

Acceptance and Type Testing of Single Phase and Three Phase UPS Units from Various Manufacturers. 1997-2003

15 B.Tech Projects for Electrical and Electronics Branch and 3 B.Tech Projects for Electronics and Communication Branch -

1. Steady State Analysis and Modelling of Untransposed Transmission Lines - 1985

2. Software Development for Stability Studies on Single Machine-Infinite Bus System - 1986

3. Software Development for Prediction of Subsynchronous Resonance in a Synchronous Machine Systems - 1988

4. Pole Assignment by State Feedback - 1989

5. Multimachine Transient Stability Analysis by Extended Equal Area Criterion - 1990

6. Computer Aided Analysis of Switched Capacitor Filters - 1990

7. Computer Aided Analysis of Active RC Filters - 1990

8. The development of an interactive software for Distribution System Simulation and Analysis - 1992

9. Software Development for Linear Antenna Analysis - 1992

10. Energy Conservation in Room Airconditioning Units - 1994

11. Design and Development of a low cost load analyser - 1995

12. Current Minimizing Controller for Energy Conservation in an Underloaded Induction Motor - 1995

13. Design, Simulation and Implementation of a Multi-State Battery Charger - 1999

14. Design and Simulation of a 500VA , 230V , Single-Phase Power Quality Conditioner with and without Battery Backup - 1999

15. Design , Development and Testing of an Off-Line 48V,10A Lead Acid Battery Charger - 1999

16. Design and Testing of a Single Phase Boost Type Active PFC AC/DC Converter - 2001

17. Comparative Evaluation of High Frequency Isolated DC-AC Converter Topologies. - 2001

18. Simulation of Waveform Control Strategies in a Single Phase DC/AC Converter - 2003

19. Library Catalogue Search - Short Project - 2003

20. Microprocessor Based Resistance and Capacitance Measurement - Short Project - 2003

(1) THEORY COURSES

(a) Pulse and Digital Electronics (EE221T)

(b) Power Systems - II (EE380T)

(c) Electronics - II (EEU204)

(d) Analog and Digital Comunication (EE412T)

(e) Electric Circuit Theory (EE210T)

(f) Dynamics of Electrical Machines (EE6303D)

(g) Switched Mode and Resonant Converters (EE6308D)

(h) FACTS and Custom Power (EE6204D)

(2) LABORATARY COURSES

(a) Basic Electrical Engineering Laboratory.

(b) Electrical Measurements Laboratory.

(c) Electrical Machines Laboratory I.

(d) Electrical Machines Laboratory II.

(e) Electronics Laboratory II.

MHRD TAPTEC Project - "DSP Applications in Power Electronics" - Sept 2001 - Dec 2003 - Project Nearing Completion - Amount Sanctioned - Rs. 9 Lakhs

Guided 17 M.Tech Projects , 15 for M.Tech(Power Electronics) students and 2 for M.Tech (Energetics) students.

(i) Analysis and Design of an Electronically Variable Capacitor for Phase Conversion Applications. 1993

(ii) Automatic Power Supply Test System. 1994

(iii) One Cycle Control of DC-DC and DC-AC Converters. 1996

(iv) Design and Implementation of Closed Loop Reactive Power Compensation using PWM-VSI Based Static Var Compensator. 1995

(v) Cryo-Cooler Power Controller. 1995

(vi) Design and Implementation of a Single Phase Static Var Compensator using Current Regulated PWM Inverter. 1996

(vii) Load Forecasting Using Discrete Kalman Filter. 1993

(viii) An Analog Frequency Deviation Measurement System. 1996

(ix) Design and Testing of a 48VDC-230VAC,1kVA Single Phase Sinusoidal Inverter with Voltage Control. 1997

(x) Switched Mode Full Bridge Power Amplifier with One Cycle Control. 1997

(xi) High Frequency Synchronous Link Based DC/DC Converters - 1999

(xii) Design and Simulation of Single Phase Boost PWM Rectifier with Sinusoidal Input Current. 1999

(xiii) Comparative Evaluation of Control Strategies for Three Phase Active Power Filters Using MATLAB Simulink - 2001

(xiv) Design and Testing of a Single Phase Boost Type Active PFC AC/DC Converter. 2001

(xv) Performance Evaluation of a one-cycle controlled two-cell boost power factor corrected AC-DC Converter using Orcad 9.2. 2002

(xvi) Control of a Unified Power Flow Controller - A Simulation Study using MATLAB/Simulink. 2002

(xvii) Single-Phase Active Filtering Using Neutral Point Clamped AC/DC Converter. 2003