Chất lượng điện năng_Power Quality by C. Sankaran.

chất lượng điện năng[bkeps.com]Frequency disturbances, transients, grounding, interference…the issues related to power quality are many, and solutions to power quality problems can be complex. However, by combining theory and practice to develop a qualitative analysis of power quality, the issues become relatively straightforward, and one can begin to find solutions to power quality problems confronted in the real world. Power Quality builds the foundation designers, engineers, and technicians need to survive in the current power system environment. It treats power system theory and power quality principles as interdependent entities, and balances these with a wealth of practical examples and data drawn from the author’s 30 years of experience in the design, testing, and trouble-shooting of power systems. It compares different power quality measurement instruments and details ways to correctly interpret power quality data. It also presents alternative solutions to power quality problems and compares them for feasibility and economic viability. Power quality problems can have serious consequences, from loss of productivity to loss of life, but they can be easily prevented. You simply need a good understanding of electrical power quality and its impact on the performance of power systems. By changing the domain of power quality from one of theory to one of practice, this book imparts that understanding and will develop your ability to effectively measure, test, and resolve power quality problems.

The name of this book is
Power Quality,
but the title could very well be
The Power
Quality Do-It-Yourself Book
. When I set out to write this book, I wanted it to be
user friendly, easy to understand, and easy to apply in solving electrical power system
problems that engineers and technicians confront on a daily basis. As an electrical
engineer dealing with power system quality concerns, many of the books I consulted
lacked direct and precise information and required a very thorough search to find
what I needed. Very often, I would spend several hours pondering a case just so the
theory I read and the practical findings would come together and make sense. This
book is the product of my thought processes over many years. I have tried to combine
the theory behind power quality with actual power quality cases which I have been
involved with in order to create a book that I believe will be very useful and demystify
the term
power quality
.
What is power quality? Power quality, as defined in this book, is “a set of electrical
boundaries that allows equipment to function in its intended manner without significant
loss of performance or life expectancy.” Conditions that provide satisfactory
performance at the expense of life expectancy or vice versa are not acceptable.
Why should power quality be a concern to facility designers, operators, and
occupants? When the quality of electrical power supplied to equipment is deficient,
performance degradation results. This is true no matter if the equipment is a computer
in a business environment, an ultrasonic imaging machine in a hospital, or a process
controller in a manufacturing plant. Also, good power quality for one piece of
equipment may be unacceptable for another piece of equipment sitting right next to
it and operating from the same power lines, and two identical pieces of equipment

can react differently to the same power quality due to production or componenttolerances. Some machines even create their own power quality problems. Give such hostile conditions, it is important for an engineer entrusted with the design or
operation of an office building, hospital, or a manufacturing plant to be knowledgeable
about the basics of power quality.
This book is based on 30 years of personal experience in designing, testing, and
troubleshooting electrical power systems and components, the last 9 of which have
been spent exclusively studying and solving power quality problems for a wide
spectrum of power users. This book is not an assemblage of unexplained equations
and statements. The majority of the information contained here is based on my
experiences in the power system and power quality fields. Mathematical expressions
are used where needed because these are essential to explaining power quality and
its effects. Throughout the book, several case examples are provided, the steps used
to solve power quality problems are described in depth, and photographs, illustrations,
and graphs are used to explain the various power quality issues. The examples show
that many power quality problems that have resulted in loss of productivity, loss of equipment, injury to personnel, and in some cases, loss of life could easily have been
avoided. All that is needed to prevent such consequences is a clear understanding of
electrical power quality and its effects on power system performance.
I hope the reader will enjoy reading this book as much as I enjoyed writing it.
Also, I hope the reader will find the book useful, as it is based on the experiences
of an electrical engineer who has walked through the minefields of electrical power
system quality and for the most part survived.

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