This book is based on notes for the
Transformer Applications Course offered by the Center for Power System Study at
Lehigh University. The key word in both the title of that course and the title
of this book is applications.
The material presented in the following chapters was obtained from various sources:
textbooks, industry standards, and established utility practices and procedures.
Several things set this book apart from
other transformer reference books. First, this book emphasizes the importance
of magnetic properties and how the choice of a core design can affect the
transformer’s electrical properties, especially during faults and unbalanced operations.
Many reference books overlook this critical aspect of transformer applications.
Next, this book discusses special types of
transformer connections, such as the zigzag, Scott, and tee connections, as
well as the more common wye and delta types. The Scott and tee connections, which transform
three-phase voltages into two-phase voltages, are seldom covered in modern
transformer reference books even though two-phase systems still exist today.
Tap changing under load and variable phase shifting transformers are covered.
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This book is intended primarily for
readers having an electrical engineering background although training as an
electrical engineer is not necessary, and others will also benefit from the
conclusions that can be drawn from the practical examples. Mastery of the
principles presented in this book will provide a sound working knowledge of how
to specify, operate, and maintain power transformers in a utility or plant
environment.
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Contents of this BOOK are:
Basic Transformer Theory
Two-Winding Transformer
Connections
Transformer Impedance and
Losses
Autotransformers and
Three-Winding Transformers
Short Circuits, Inrush
Currents, and Other Phenomena
Ancillary Equipment
Reading and Applying Nameplate
Information
Maintenance, Testing,
Troubleshooting, and Reliability
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