Топливно-энергетический комплекс
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Sankaran C. Power quality
Preface

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 conces, many of the books I consulted
lacked direct and precise information and required a very thorough search to ?nd
what I needed. Very often, I would spend several hours pondering a case just so the
theory I read and the practical ?ndings 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 de?ned in this book, is a set of electrical
boundaries that allows equipment to function in its intended manner without signif-
icant 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 conce to facility designers, operators, and
occupants? When the quality of electrical power supplied to equipment is de?cient,
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 component
tolerances. Some machines even create their own power quality problems. Given
such hostile conditions, it is important for an engineer entrusted with the design or
operation of an of?ce building, hospital, or a manufacturing plant to be knowledge-
able 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 ?elds. 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.
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