hamari acadmi: Power Transformers:Principles and Applications

Power Transformers:Principles and Applications

by John J. Winders, Jr.

Power Transformers: Principles and Applications is a comprehensive compendium of theory and practices for electric power transformers. This book provides a concise but thorough treatment of basic transformer theory, its application to various types of transformer designs and their application in utility and industrial power systems. Its easy to read style and linear organization make it particularly suitable as a tutorial for those who need to learn the material independently, outside of the classroom, or as a text for formal courses. This book also makes a very good practical reference for utility and industrial power engineers.In addition to having concise summaries of all the basics, the text provides an excellent description of the various ancillary equipment and systems, which are often the most difficult to precisely engineer and fit into the system. John Winders has also provided excellent coverage of how to read, interpret, and apply a power transformer’s nameplate data, not always a straightforward or unambiguous task and one where a surprising number of mistakes are made by inexperienced engineers.Chapter 8 will be particularly useful to practicing engineers and power system operators, covering maintenance needs, testing options, and troubleshooting techniques and their use, and discussing reliability of transformers.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. Different types of transformer coil and coil construction are compared, with discussion of the particular advantages and disadvantages of each with respect to the various transformer connections. The reader will also gain insight into some of the economic trade-offs of different transformer design options.
A brief tutorial on symmetrical components is also included. The topic is covered in other reference books but seldom in such a compact and straight-forward way, enabling the reader to immediately apply the technique in practical problems.

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Power Transformers:Principles and Applications