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ISBN: 978-1-119-22685-7
J. C. DAS is an independent consultant at Power System Studies Inc., Snellville, GA. Earlier, he headed the electrical power systems department at Amec Foster Wheeler for the last 30 years. He has varied experience in the utility industry, industrial establishments, hydroelectric generation, and atomic energy. He is responsible for power system studies, including short-circuit, load flow, harmonics, stability, arc-flash hazard, grounding, switching transients, and protective relaying. He conducts courses for continuing education in power systems and has authored or coauthored about 68 technical publications nationally and internationally. He is author of the books:
These books provide extensive converge, running into more than 3000 pages, and are well received in the technical circles. His interests include power system transients, EMTP simulations, harmonics, passive filter designs, power quality, protection, and relaying. He has published more than 200 electrical power system study reports for his clients.
Mr. Das is a life fellow of Institute of Electrical and Electronics Engineers, IEEE (USA); a member of the IEEE Industry Applications and IEEE Power Engineering societies; a fellow of Institution of Engineering Technology (UK); a life fellow of the Institution of Engineers (India); a member of the Federation of European Engineers (France); a member of CIGRE (France); etc. He is a registered Professional Engineer in the States of Georgia and Oklahoma, a Chartered Engineer (C. Eng.) in the United Kingdom, and a European Engineer (Eur. Ing.) in the European Union (EU). He received meritorious award in engineering, IEEE Pulp and Paper Industry in 2005.
He received MSEE degree from Tulsa University, Tulsa, Oklahoma; and BA (advanced mathematics) and BEE degrees from Punjab University, India.
THIS BOOK BY J. C. DAS OFFERS AN IN-DEPTH, practical, yet intellectually appealing treatment of symmetrical components not seen since the late Paul M. Anderson's classic, Analysis of Faulted Power Systems, which was first published in 1995 by the Wiley-IEEE Press in the Power Engineering Series. The present book leverages the author's well over 30 years of experience in power system studies, and continues in his same tradition of attention to details, which should appeal to those professionals who benefitted from his writing style demonstrated in his four earlier books. The subject is taught at the undergraduate and graduate courses in most universities with a power systems option.
The advent of the symmetrical components concept is due to the Westinghouse electrical engineer Charles LeGeyt Fortescue, who was born in 1876 at York Factory in Manitoba, Canada, who became the first electrical engineer to graduate from Queen's University at Kingston in Ontario, Canada, in 1898. In 1918, Fortescue contributed an 88 page, now classic, remarkable paper by the title “Method of Symmetrical Coordinates Applied to the Solution of Polyphase Networks” in the Transactions of the American Institute of Electrical Engineers (AIEE), one of the two predecessors of present day IEEE. This breakthrough is due to Fortesue's investigations of railway electrification problems which began in 1913. Following the paper's publication, the earlier name “Symmetrical Coordinates” was changed to “Symmetrical Components” and the approach gained in popularity ever since it was disclosed as an indispensable method of dealing with unbalanced three-phase operation problems of electric power systems. A thorough understanding of the application of symmetrical components is required for proper design of electric power protection systems.
Chapter 1 uses matrix algebra to demonstrate the non-uniqueness of symmetrical component transformations. Chapter 2 treats sequence impedances, their networks, and their reduction. Chapters 3 and 4 discuss symmetrical component applications in generating models for transmission lines, cables, synchronous generators, and induction motors. Chapter 3 notes that much of the theoretical underpinnings of the area discussed should be reviewed elsewhere. Prior to discussing three-phase models of two-winding three-phase transformers and conductors, Chapter 5 begins by advising the reader to study this chapter along with Chapter 7. Chapter 6 covers unsymmetrical shunt and series faults and also calculations of overvoltages at the fault plane.
M. E. El-Hawary
THIS SHORT BOOK consisting of seven chapters attempts to provide a clear understanding of the theory of the symmetrical component transformation and its applications in power system modeling.
Chapter 1 takes a mathematical approach to document that the symmetrical component eigenvectors are not unique and one can choose arbitrary vectors meeting the constraints, but these will not be very meaningful in the transformation—thus selection of vectors as they are forms a sound base of the transformation. This is followed by Chapter 2, which details the concepts of sequence impedances, their models, formation of sequence impedance networks and their reduction. Chapters 3 and 4 are devoted to symmetrical component applications in generating the models for transmission lines, cables, synchronous generators, and induction motors. Chapters 5 and 7 are meant to be read together and describe three-phase models and phase-coordinate method of solution where the phase-unbalance in the power system cannot be ignored and symmetrical components cannot be applied. Chapter 6 covers unsymmetrical shunt and series faults and also calculations of overvoltages at the fault point (COG). It has a worked out longhand example to illustrate the complexity of calculations even in a simple electrical distribution system. This is followed with the matrix methods of solution which have been adopted for calculations on digital computers. The author is thankful and appreciates all the cooperation and help received from Ms. Mary Hatcher, Wiley-IEEE and her staff in completing this publication. She rendered similar help and cooperation for the publications of author's other two books by IEEE Press (see Author's profile). An author cannot expect anything better than the help and cooperation rendered by Ms. Mary Hatcher.
The authors special thanks go to Dr. M.E. El-Hawary, Professor of Electrical and Computer Engineering, Dalhousie University, Canada for writing the Foreword to this book. He is a renowned authority on Electrical Power System; the author is grateful to him, and believes that this Foreword adds to the value and the marketability of the book.
J. C. Das