Recent Trends in the Condition Monitoring of Transformers
Recent Trends in the Condition Monitoring of Transformers

Author: Sivaji Chakravorti

Publisher: Springer Science & Business Media

Published: 2013-10-21

Total Pages: 289

ISBN-13: 1447155505

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Recent Trends in the Condition Monitoring of Transformers reflects the current interest in replacing traditional techniques used in power transformer condition monitoring with non-invasive measures such as polarization/depolarization current measurement, recovery voltage measurement, frequency domain spectroscopy and frequency response analysis. The book stresses the importance of scrutinizing the condition of transformer insulation which may fail under present day conditions of intensive use with the resulting degradation of dielectric properties causing functional failure of the transformer. The text shows the reader how to overcome the key challenges facing today’s maintenance policies, namely: The selection of appropriate techniques for dealing with each type of failure process accounting for the needs of plant owners, plant users and wider society; and Cost-efficiency and durability of effect. Many of the failure-management methods presented rely on the fact that most failures give warning when they are imminent. These potential failures give rise to identifiable physical conditions and the novel approaches described detect them so that action can be taken to avoid degeneration into full-blown functional failure. This “on-condition” maintenance means that equipment can be left in service as long as a specified set of performance standards continue to be met, avoiding the costly downtime imposed by routine and perhaps unnecessary maintenance but without risking equally expensive failure. Recent Trends in the Condition Monitoring of Transformers will be of considerable interest to both academic researchers in power systems and to engineers working in the power generation and distribution industry showing how new and more efficient methods of fault diagnosis and condition management can increase transformer efficiency and cut costs.

Feedback Systems
Feedback Systems

Author: Karl Johan Åström

Publisher: Princeton University Press

Published: 2021-02-02

Total Pages:

ISBN-13: 069121347X

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The essential introduction to the principles and applications of feedback systems—now fully revised and expanded This textbook covers the mathematics needed to model, analyze, and design feedback systems. Now more user-friendly than ever, this revised and expanded edition of Feedback Systems is a one-volume resource for students and researchers in mathematics and engineering. It has applications across a range of disciplines that utilize feedback in physical, biological, information, and economic systems. Karl Åström and Richard Murray use techniques from physics, computer science, and operations research to introduce control-oriented modeling. They begin with state space tools for analysis and design, including stability of solutions, Lyapunov functions, reachability, state feedback observability, and estimators. The matrix exponential plays a central role in the analysis of linear control systems, allowing a concise development of many of the key concepts for this class of models. Åström and Murray then develop and explain tools in the frequency domain, including transfer functions, Nyquist analysis, PID control, frequency domain design, and robustness. Features a new chapter on design principles and tools, illustrating the types of problems that can be solved using feedback Includes a new chapter on fundamental limits and new material on the Routh-Hurwitz criterion and root locus plots Provides exercises at the end of every chapter Comes with an electronic solutions manual An ideal textbook for undergraduate and graduate students Indispensable for researchers seeking a self-contained resource on control theory

Natural Language Processing with Transformers, Revised Edition
Natural Language Processing with Transformers, Revised Edition

Author: Lewis Tunstall

Publisher: "O'Reilly Media, Inc."

Published: 2022-05-26

Total Pages: 409

ISBN-13: 1098136764

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Since their introduction in 2017, transformers have quickly become the dominant architecture for achieving state-of-the-art results on a variety of natural language processing tasks. If you're a data scientist or coder, this practical book -now revised in full color- shows you how to train and scale these large models using Hugging Face Transformers, a Python-based deep learning library. Transformers have been used to write realistic news stories, improve Google Search queries, and even create chatbots that tell corny jokes. In this guide, authors Lewis Tunstall, Leandro von Werra, and Thomas Wolf, among the creators of Hugging Face Transformers, use a hands-on approach to teach you how transformers work and how to integrate them in your applications. You'll quickly learn a variety of tasks they can help you solve. Build, debug, and optimize transformer models for core NLP tasks, such as text classification, named entity recognition, and question answering Learn how transformers can be used for cross-lingual transfer learning Apply transformers in real-world scenarios where labeled data is scarce Make transformer models efficient for deployment using techniques such as distillation, pruning, and quantization Train transformers from scratch and learn how to scale to multiple GPUs and distributed environments

Electrical Power Equipment Maintenance and Testing
Electrical Power Equipment Maintenance and Testing

Author: Paul Gill

Publisher: CRC Press

Published: 2016-12-19

Total Pages: 1001

ISBN-13: 1420017551

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The second edition of a bestseller, this definitive text covers all aspects of testing and maintenance of the equipment found in electrical power systems serving industrial, commercial, utility substations, and generating plants. It addresses practical aspects of routing testing and maintenance and presents both the methodologies and engineering basics needed to carry out these tasks. It is an essential reference for engineers and technicians responsible for the operation, maintenance, and testing of power system equipment. Comprehensive coverage includes dielectric theory, dissolved gas analysis, cable fault locating, ground resistance measurements, and power factor, dissipation factor, DC, breaker, and relay testing methods.

Power Quality in Power Systems and Electrical Machines
Power Quality in Power Systems and Electrical Machines

Author: Ewald F. Fuchs

Publisher: Academic Press

Published: 2015-07-14

Total Pages: 1138

ISBN-13: 0128009888

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The second edition of this must-have reference covers power quality issues in four parts, including new discussions related to renewable energy systems. The first part of the book provides background on causes, effects, standards, and measurements of power quality and harmonics. Once the basics are established the authors move on to harmonic modeling of power systems, including components and apparatus (electric machines). The final part of the book is devoted to power quality mitigation approaches and devices, and the fourth part extends the analysis to power quality solutions for renewable energy systems. Throughout the book worked examples and exercises provide practical applications, and tables, charts, and graphs offer useful data for the modeling and analysis of power quality issues. - Provides theoretical and practical insight into power quality problems of electric machines and systems - 134 practical application (example) problems with solutions - 125 problems at the end of chapters dealing with practical applications - 924 references, mostly journal articles and conference papers, as well as national and international standards and guidelines

Analyzing the Relationship Between Innovation, Value Creation, and Entrepreneurship
Analyzing the Relationship Between Innovation, Value Creation, and Entrepreneurship

Author: Galindo-Martín, Miguel-Ángel

Publisher: IGI Global

Published: 2019-12-13

Total Pages: 374

ISBN-13: 1799811719

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Innovation stimulates and facilitates entrepreneurship because the highest levels of entrepreneurship are to be found in societies with the highest value creation and digital dividends. The higher levels of consumption, employment, and cost reduction generated by the implementation of digital technologies motivates entrepreneurs to expand their activity and promotes the emergence of new entrepreneurs. Positive outcomes can be generated by the implementation of innovation leaders to higher competition and new markets, incentivizing entrepreneurs to introduce new innovations to react to these higher levels of competition, which are accompanied by their corresponding value creation. Analyzing the Relationship Between Innovation, Value Creation, and Entrepreneurship is a pivotal reference source that analyzes the theoretical and empirical aspects of innovation as a factor that enhances value creation and the role of entrepreneurship. While highlighting topics such as data management, social enterprise, and digital marketing, this publication explores enhanced economic growth and the methods of higher levels of consumption in society. This book is ideally designed for corporate managers, business executives, academicians, students, and researchers seeking current research on interrelationships between financial variables, strategies to apply them at the micro- and macro-level, and a consideration of the fiscal effects once implemented.

Power Transformers
Power Transformers

Author: John Winders

Publisher: CRC Press

Published: 2002-04-12

Total Pages: 298

ISBN-13: 0824744438

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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.

Recent Advances in Multidisciplinary Applied Physics
Recent Advances in Multidisciplinary Applied Physics

Author: Antonio Mendez-Vilas

Publisher: Elsevier

Published: 2005-09-28

Total Pages: 999

ISBN-13: 008048056X

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The 1st International Meeting on Applied Physics (APHYS-2003) succeeded in creating a new international forum for applied physics in Europe, with specific interest in the application of techniques, training, and culture of physics to research areas usually associated with other scientific and engineering disciplines.This book contains a selection of peer-reviewed papers presented at APHYS-2003, held in Badajoz (Spain), from 15th to 18th October 2003, which included the following Plenary Lectures:* Nanobiotechnology - Interactions of Cells with Nanofeatured Surfaces and with Nanoparticles* Radiation Protection of Nuclear Workers - Ethical Issues* Chaotic Data Encryption for Optical Communications