Computer Relaying for Power Systems

Since publication of the first edition of Computer Relaying for Power Systems in 1988, computer relays have been widely accepted by power engineers throughout the world and in many countries they are now the protective devices of choice.The authors have updated this new edition with the latest developments in technology and applications such as adaptive relaying, wide area measurements, signal processing, new GPS-based measurement techniques and the application of artificial intelligence to digital relays. New material also includes sigma-delta and oversampling A/D converters, self-polarizing and cross-polarizing in transmission lines protection and optical current and voltage transformers.Phadke and Thorp have been working together in power systems engineering for more than 30 years. Their impressive work in the field has been recognized by numerous awards, including the prestigious 2008 Benjamin Franklin Medal in Electrical Engineering for their pioneering contributions to the development and application of microprocessor controllers in electric power systems. Provides the student with an understanding of computer relaying Authored by international authorities in computer relaying Contents include relaying practices, mathematical basis for protective relaying algorithms, transmission line relaying, protection of transformers, machines and buses, hardware organization in integrated systems, system relaying and control, and developments in new relaying principles Features numerous solved examples to explain several of the more complex topics, as well as a problem at the end of each chapter Includes an updated list of references and a greatly expanded subject index.

Arun Phadke is Professor of Electrical Engineering at Virginia Polytechnic Institute and State University, Blacksburg.

James S Thorp is Professor and Department Head at Virginia Polytechnic Institute and State University, Blacksburg.

About the Authors
Preface to the First Edition
Preface to the Second Edition
Glossary of Acronyms
Introduction to computer relaying
Development of computer relaying
Historical background
Expected benefits of computer relaying
Computer relay architecture
Analog to digital converters
Anti-aliasing filters
Substation computer hierarchy
Summary
Problems
References
Relaying practices
Introduction to protection systems
Functions of a protection system
Protection of transmission lines
Transformer, reactor and generator protection
Bus protection
Performance of current and voltage transformers
Summary
Problems
References
Mathematical basis for protective relaying algorithms
Introduction
Fourier series
Other orthogonal expansions
Fourier transforms
Use of fourier transforms
Discrete fourier transform
Introduction to probability and random process
Random processes
Kalman filtering
Summary
Problems
References
Digital filters
Introduction
Discrete time systems
Discrete time systems
Z Transforms
Digital filters
Windows and windowing
Linear phase
Approximation filter synthesis
Wavelets
Elements of artificial intelligence
Conclusion
Problems
References
Transmission line relaying
Introduction
Sources of error
Relaying as parameter estimation
Beyond parameter estimation
Symmetrical component distance relay
Newer analytic techniques
Protection of series compensated lines
Summary
Problems
References
Protection of transformers, machines and buses
Introduction
Power transformer algorithms
Generator protection
Motor protection
Digital bus protection
Summary
Problems
References
Hardware organization in integrated systems
The nature of hardware issues
Computers for relaying
The substation environment
Industry environmental standards
Countermeasures against EMI
Supplementary equipment
Redundancy and backup
Servicing, training and maintenance
Summary
References
System relaying and control
Introduction
Measurement of frequency and phase
Sampling clock synchronization
Application of phasor measurements to state estimation
Phasor measurements in dynamic state estimation
Monitoring
Control applications
Summary
Problems
References
Relaying applications of traveling waves
Introduction
Traveling waves on single-phase lines
Traveling waves on three-phase lines
Directional wave relay
Traveling wave distance relay
Differential relaying with phasors
Traveling wave differential relays
Fault location
Other recent developments
Summary
Problems
References
Wide area measurement applications
Introduction
Adaptive relaying
Examples of adaptive relaying
Wide area measurement systems (WAMS)
WAMS architecture
WAMS based protection concepts
Summary
Problems
References

Representative system data
Transmission lines
Transformers
Generators
Power system
References

Standard sampling rates
References

Conversion between different sampling rates
References

Standard for transient data exchange
References
Index
Table of Contents provided by Publisher. All Rights Reserved.

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Computer Relaying for Power Systems

Summary

Author Biography

Table of Contents

Supplemental Materials