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Power Transformers

Author: John Winders
Publisher: CRC Press
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Complete with equations, illustrations, and tables, this book covers the basic theory of electric power transformers, its application to transformer designs, and their application in utility and industrial power systems. The author presents the principles of the two-winding transformer and its connection to polyphase systems, the origins of transformer losses, autotransformers, and three-winding transformers and compares different types of transformer coil and coil construction. He describes the effects of short circuits on transformers, the design and maintenance of ancillary equipment, and preventative and predictive maintenance practices for extending transformer life.


Transformers

Author: Bhel
Publisher: Tata McGraw-Hill Education
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This book is the collective effort of eminent experts from Bharat Heavy Electricals Limited (BHEL), a leading transformer manufacturer in India. An editorial committee perused the complete material, to integrate it into a homogenous book and to ensure complete continuity between the chapters. A list of authors and members of the editorial committee is included in the book.


Collection of pamphlets and circulars relating to Pittsburgh transformers

Author: Pittsburgh Transformer Company
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Condition Monitoring and Assessment of Power Transformers Using Computational Intelligence

Author: W.H. Tang
Publisher: Springer Science & Business Media
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In recent years, rapid changes and improvements have been witnessed in the field of transformer condition monitoring and assessment, especially with the advances in computational intelligence techniques. Condition Monitoring and Assessment of Power Transformers Using Computational Intelligence applies a broad range of computational intelligence techniques to deal with practical transformer operation problems. The approaches introduced are presented in a concise and flowing manner, tackling complex transformer modelling problems and uncertainties occurring in transformer fault diagnosis. Condition Monitoring and Assessment of Power Transformers Using Computational Intelligence covers both the fundamental theories and the most up-to-date research in this rapidly changing field. Many examples have been included that use real-world measurements and realistic operating scenarios of power transformers to fully illustrate the use of computational intelligence techniques for a variety of transformer modelling and fault diagnosis problems. Condition Monitoring and Assessment of Power Transformers Using Computational Intelligence is a useful book for professional engineers and postgraduate students. It also provides a firm foundation for advanced undergraduate students in power engineering.


Transformers Induction Machines

Author: M.V.Bakshi U.A.Bakshi
Publisher: Technical Publications
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Basic Concepts : Concept of coupled circuits, Dot convention, Writing network equilibrium equations in coupled circuits (problems on coupled circuits excluded), Principle of transformer action for voltage transformation, Constructional details of shell type and core type single-phase and three-phase transformers, Description of the following types of transformers - power transformer, distribution transformer, Constant voltage transformer, Constant current transformer, Variable frequency transformers, Auto-transformers.Single-phase Transformers : Concept of ideal transformer, Equation for E.M.F. induced in the two windings, Voltage transformation ratio, Ideal transformer on no-load and loaded condition with corresponding phasor diagrams, Concept of M.M.F. balance in the magnetic circuit of an ideal transformer, Current transformation ratio, Concept of referring impedance connected on one side of ideal transformer to the other side, Practical transformer-how it deviates from the ideal transformer, Development of exact equivalent circuit of a practical transformer-visualization of a practical transformer as an ideal transformer combined with imperfections of electric and magnetic circuits, Approximate equivalent circuit of a practical transformer.Phasor diagram of a practical transformer for both no-load and loaded conditions, Losses, Power and all-day efficiency, Regulation, Testing of transformers - O.C. test, S.C. test and predetermination of efficiency and regulation, Sumpner s test, Parallel operation - need, conditions to be satisfied for parallel operation, Load sharing.Three-phase Transformers : All types of three-phase transformer connections including open delta, Choice of connection, Bank of single-phase transformers for three-phase operation, Phase conversion using transformers, Scott connection for three-phase to two-phase conversion, Labelling of three-phase transformer terminals, Phase shift between primary and secondary and vector groups, Conditions for proper operation of three-phase transformers in parallel. Three-winding Transformers : Advantages and disadvantages of three-winding transformers, Equivalent circuit. Basic Concepts of Induction Machines : Concept of rotating magnetic field, Operating principle, Construction, Classification and types - single-phase, three-phase, squirrel-cage, slip-ring, double-cage types.Three-phase Induction Motor : Phasor diagram of induction motor on no-load and loaded conditions, Visualization of a three-phase induction motor as a generalized transformer with a rotating secondary and obtaining its equivalent circuit, Different kinds of power losses in an induction motor, Efficiency, Performance evaluation-output power, Torque, Efficiency, Current and power factor. Torque-slip characteristics covering motoring, Generating and braking regions of operation, Induction generator, No-load and blocked rotor tests, Circle diagram and therefrom performance evaluation of the motor, Cogging and crawling, Equivalent circuit and performance of double-cage and deep-bar motors. Starting and Control of Three-phase Induction Motor : Need for starter, DOL, Y-Delta and auto-transformer starting, Rotor resistance starting, Electronic starters, Speed control - voltage, frequency and rotor resistance variations.Single-phase Induction Motor : Double revolving field theory and principle of operation, Types of single-phase induction motors: split-phase, Capacitor start, Shaded pole motors.


D C Machines and Transformers

Author: U.A.Bakshi
Publisher: Technical Publications
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Machinery Fundamentals Field energy and mechanical force - Forces and torque - Energy conversion via electric field - Principles of electromechanical energy conversion - Single and multiple excited systems - Types of armature winding - Generated voltage.DC Generators Constructional details - principle - EMF equation - Methods of excitation - Self and separately excited generators - Characteristics of series, shunt and compound generators - Armature reaction and commutation - Parallel operation - applications.DC Motors Principle of operation - Back EMF and torque equations - Types of DC Motors - Circuit model - Characteristics - Starting methods - Speed control methods - Separation of no load losses - Applications. Transformers Constructional details - Types of windings - Principle of operation - EMF equation - Transformation ratio - Transformer on no-load - Equivalent circuit - Transformer on load - Regulation - Parallel operation - Auto transformer - saving of copper - Instrument transformers - Three phase transformers - Types of Connections - Scott Connection. Testing of DC Machines and Transformers Losses and efficiency in DC machines and transformers - Condition for maximum efficiency - Testing of DC machines - Brake test, Swinburne s test, Retardation test and Hopkinson s test - Testing of transformers - Polarity test, load test, - Phasing out test - Sumpner s test - Separation of losses - All day efficiency.


Magnetic Circuits and Transformers

Author: U.A.Bakshi
Publisher: Technical Publications
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Electromagnetism Review of electromagnetism, Magnetic field strength, Magnetic force.Magnetic Circuits Magnetomotive force, Reluctance, Laws of magnetic circuits, Determination of ampere-turns for series and parallel magnetic circuits, Magnetic leakage and fringing, Hysteresis and eddy current losses. Electromagnetic Induction Faraday s laws, Lenz s law, Statically and dynamically induced E.M.F., Energy stored in magnetic field. Transformers Introduction, Principle of working, Construction of single phase transformer, E.M.F. equation, Phasor diagram on no load, Leakage reactance, Transformer on load, Equivalent circuit, Voltage regulation, Power and energy efficiency, Open circuit and short circuit tests, Equivalent circuit parameters estimation. Effect of saturation on exciting current, In-rush current phenomenon.Parallel operation of single phase transformer. Autotransformer Principle of operation, Comparison with two winding transformers.Three Phase Transformers Different winding connections, Voltage and current ratios, Comparative features, Effect of connections on exciting current, Parallel operation. Three winding transformer-Equivalent circuit, Off-load and on-load tap changing transformer, Scott connections.


Electronic Tap changer for Distribution Transformers

Author: Jawad Faiz
Publisher: Springer Science & Business Media
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This reference collects all relevant aspects electronic tap-changer and presents them in a comprehensive and orderly manner. It explains logically and systematically the design and optimization of a full electronic tap-changer for distribution transformers. The book provides a fully new insight to all possible structures of power section design and categorizes them comprehensively, including cost factors of the design. In the control section design, the authors review mechanical tap-changer control systems and they present the modeling of a full electronic tap-changer as well as a closed-loop control of the full-electronic tap-changer. The book is written for electrical engineers in industry and academia but should be useful also to postgraduate students of electrical engineering.


Electric Power Transformer Engineering Second Edition

Author: James H. Harlow
Publisher: CRC Press
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Combining select chapters from Grigsby's standard-setting The Electric Power Engineering Handbook with several chapters not found in the original work, Electric Power Transformer Engineering became widely popular for its comprehensive, tutorial-style treatment of the theory, design, analysis, operation, and protection of power transformers. For its second edition, this popular progeny rejoins the handbook as one in a set of five carefully focused volumes. In addition to updates in nearly every chapter, this highly regarded reference brings to the Handbook its original contributions, discussing phase-shifting, rectifier, and constant-voltage transformers as well as power transformer protection and transient-voltage response. It also includes two new sections in the chapter on reactors, covering installation considerations for dry-type air-core reactors as well as line traps and power line carrier communication-, data-, and protective-relaying systems. Major updates appear in the highly active areas of dry-type transformers, instrument transformers, reactors, and load-tap changers. This book offers convenient access to everything from basic theory and concepts to detailed analysis of the individual components of a transformer. Reflecting standards, technologies, and new developments around the world, Electric Power Transformer Engineering, Second Edition provides a thorough and up-to-date guide for power engineers at all levels of expertise. Other volumes in the set include: Electric Power Generation, Transmission, and Distribution Electric Power Substations Engineering, Second Edition Power Systems Power System Stability and Control


Since the Time of the Transformers

Author: Alan D. McMillan
Publisher: UBC Press
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This book examines over 4000 years of culture history of the related Nuu-chah-nulth, Ditidaht, and Makah peoples on western Vancouver Island and the Olympic Peninsula. Using data from the Toquaht Archaeological Project, McMillan challenges current ethnographic interpretations that show little or no change in these peoples' culture. Instead, by combining historical evidence, recent archaeological data, and oral traditions he demonstrates conclusively that there were in fact extensive cultural changes and restructuring in these societies in the century following contact with Europeans.