Showing posts with label electrics. Show all posts
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1:45 AM

Electric Power Substations Engineering


This book covers all aspects of substations, from the initial concept to design, automation, operation, and physical and cyber security. Written by members of the Institute of Electrical and Electronic Engineers (IEEE) Power Engineering Society (PES) Substations Committee, each section provides a tutorial and includes references for further reading and study. The authors use photographs and graphics to help the reader understand the material. Exploring the most recent technological developments



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1:43 AM

Electric Power Transformer Engineering





Covering the fundamental theory of electric power transformers, this book provides the background required to understand the basic operation of electromagnetic induction as applied to transformers. The book is divided into three fundamental groupings: one stand-alone chapter is devoted to Theory and Principles, nine chapters individually treat major transformer types, and fourteen chapters cover many ancillary topics associated with power transformers. Throughout the book, tables, charts, photographs, and equations describe the operation and performance of power transformers and facilitate the reader's understanding of the technical materia


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1:38 AM

Electric Machinery

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The exciting new sixth edition of Electric Machinery has been extensively updated while retaining the emphasis on fundamental principles and physical understanding that has been the outstanding feature of this classic book.
This book covers fundamental concepts in detail as well as advanced topics for readers who wish to cover the material in more depth.
Several new chapters have been added, including a chapter on power electronics, as well as one on speed and torque control of dc and ac motors. This edition has also been expanded !"
with additional examples and practice problems. The use of MATLAB has been introduced to the new edition, both in examples within the **** as well as in the chapter problems!"




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1:35 AM

Electrical Measurement, Signal Processing, and Displays


The CRC Principles and Applications in Engineering series is a library of convenient, economical references sharply focused on particular engineering topics and subspecialties. Each volume in the series comprises chapters carefully selected from CRC's bestselling handbooks, logically organized for optimum convenience, and thoughtfully priced to fit every budget.
Electrical Measurement, Signal Processing, and Displays describes the use of instruments and techniques for practical measurement of electromagnetic variables, signal processing equipment and parameters, and various types of displays, from cathode ray tubes to LED devices. For this volume, chapters relevant to these topics were culled from the bestselling Measurement, Instrumentation, and Sensors Handbook and revised by their original authors to bring them thoroughly up to date.
This is a concise, well-illustrated, and highly practical reference. It sets forth the principles, formulas, and equations engineers and scientists need for solving the instrumentation and measurement questions they encounter in practice, particularly when problems arise in areas outside their own specialties.
*Chapters logically organized by measurement problem and contributed by an international panel of experts
*Information presented on three levels: basic exposition for newcomers to the field; a detailed discussion and mathematical treatment; and advanced applications, evaluations, and directions for future study
*A full set of references in each chapter




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1:33 AM

Electrical Power Systems Quality





Electrical Power Systems Quality is an invaluable tool to everyone working in the field, from utility engineers to industrial plan technicians to power quality consultants. This Second Edition has been expanded and updated to reflect the increasing sensitivity of microelectronic devices and the ever-growing stress placed upon the power grid. This much-needed resource discusses every essential aspect of basic power quality and methods used to protect electronic systems and on understanding the causes of power quality problems and learning how to prevent them.



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5:53 AM
Schaum's Outline of Basic Electrical Engineering
by Jimmie J. Cathey


Schaum's Outline of Basic Electrical Engineering Summary

Schaum's Outline of Basic Electrical Engineering by Jimmie J. Cathey

This book covers the basic areas of study in the basic, core electrical engineering course. Solved examples and problems enhance the reader's comprehension of the material. It serves as a self-study review for professional engineering exams.


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3:34 AM

Electrical Power Equipment Maintenance and Testing

(Power Engineering) 2nd Edition



The second edition of a bestseller, this definitive text covers all aspects of testing and maintenance of the equipment found in electrical power systems serving industrial, commercial, utility substations, and generating plants. It addresses practical aspects of routing testing and maintenance and presents both the methodologies and engineering basics needed to carry out these tasks. It is an essential reference for engineers and technicians responsible for the operation, maintenance, and testing of power system equipment. Comprehensive coverage includes dielectric theory, dissolved gas analysis, cable fault locating, ground resistance measurements, and power factor, dissipation factor, DC, breaker, and relay testing methods

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3:24 AM

Power System Analysis and Design 

006 Edition, Kindle Edition



Today's readers learn the basic concepts of power systems as they master the tools necessary to apply these skills to real world situations with POWER SYSTEM ANALYSIS AND DESIGN, 6E. This new edition highlights physical concepts while also giving necessary attention to mathematical techniques. The authors develop both theory and modeling from simple beginnings so readers are prepared to readily extend these principles to new and complex situations. Software tools and the latest content throughout this edition aid readers with design issues while reflecting the most recent trends in the field.



12:55 AM

Electric Current and Theory of Electricity

What is Electric Current?

The electric current flows in the circuit if potential difference exist. The potential difference is the pressure that cause flow of charge.The flow of charge lead to flow of electric current in the circuit.

The electric current flows from the higher potential towards the lower potential. If the two points in the circuit is at the same potential, the flow of electric charge is zero hence the current is zero.The magnitude of the current depends on the rate of flow of charge from one point to another point in a given circuit.

The conducting material has large number of free electrons that can be moved from one atom to another atom under application of potential energy.

Unit of Current

The conducting material has large number of free electrons that can be moved from one atom to another atom under application of potential energy.The flow of electric current in a circuit cause by flow of electrons or charge.

The higher the rate of flow of charge, the higher the current. Let q charge flow in t time,

The current in the circuit

I= q/t

In differential form,

I= dq/dt

Electric current is the ratio of charge transferred in a given period of the time. If one coulomb of charge is transferred in one second from one point to another in the circuit is called the one unit current. The unit of electric current is coulomb per second.This is also known as ampere after the name of physicist Andrew Marie Ampere. The SI unit of  electric current is Ampere.

 How current flows in a circuit?

In metal, free electrons are available which moves randomly.When the metal is connected to a supply source,the source electron repels the electrons of the metal towards the higher potential of the supply source and all the electrons are drifted  to the positive point of the supply source which is at the higher potential.. The flow of electron cause current to flow in the circuit.

 The flow of the electric current was previously thought was because of positive charge. Now it has proved that flow of the electric current is caused by drifting of electrons from the lower to higher potential point.The flow of current caused by external field is also known as a drift current.

 The direction of the flow of electric current is opposite of the direction of flow of electrons.The current flows from the higher to lower potential point is known as conventional direction of current.

 Types of current

 Direct current  


When the current flows in one direction is called the unidirectional or direct current(DC).

 Alternating current  



When the current flows in positive and negative direction alternatively in a cycle is called alternating or AC current.


 Heating Effect of Current

When the current flows in a circuit having resistance, the heat is dissipated in the resistance. The heat produced in the circuit can be expressed as;



Where,

 I = Current in ampere
R = Resistance in Ohms
t   = Time in Seconds
This is known as Joule's Law of heating.

 Magnetic Effect of Current

 Magnetic field is set up around the current carrying conductor. The direction of the magnetic field can be found with the right Hand rule. 

 Image result for direction of magnetic field

 If a current carrying conductor is placed in a magnetic field the conductor experience a force.The magnitude of the force depends on the magnitude of the current through the conductor and on the  strength of  the magnetic field.The Direction of the force can be found by Fleming's Left Hand Rule.

 Image result for force experience by current carrying conductor

 The magnitude of the force can be expressed as;

 F= BILSinθ

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