Protection and Switchgear is designed as a textbook for undergraduate students of electrical and electronics engineering. The book aims at introducing students to the various abnormal operating conditions in power systems, system protection schemes and the phenomenon of current interruption.
With the help of detailed relay and circuit diagrams, the book describes the protection principles of each element of the power system network, including relay design and settings. It also covers digital/ numerical relaying schemes, theories of the circuit breaking phenomenon and the construction and working of switchgears.

New to the Second Edition
• Three new chapters —Chapter 18- Smart Grid Technologies and Applications, Chapter 19 - Symmetrical and Unsymmetrical Faults in Power Systems and Chapter 20 - Basic Concept and Application of Controlled Switching.
• New sections on topics such as: numerical relays, static differential and static distance relays, types of digital filters, time grading and current grading of overcurrent relays, earthing transformer, comparison between impedance, reactance and mho relay, grid integration of renewable energy sources (res), selection of circuit breakers, phasor measurement unit, etc.
• Discussion on various technical challenges due to integration of renewable energy sources with the existing grid.
• As many as 120 Additional Multiple Choice Questions along with answers introduced as a separate section at the end of the book.
• MATLAB codes for LINKNET structure and primary back-up relay pairs.

Online Resources
The following resources are available to support the faculty using this text:
For Faculty
Solutions Manual and Lecture PPTs

Table of Contents
1. Protective Relaying Fundamentals
2. Current-based Relaying Scheme
3. Distance Relaying Scheme for Transmission Line
4. Carrier Aided Distance Scheme for Transmission Lines
5. Generator Protection
6. Transformer Protection
7. Protection of Induction Motor
8. Busbar Protection
9. Current and Potential Transformers for Relaying Schemes
10. Protection Against Transients and Surges
11. Auto-reclosing and Synchronizing
12. System Response to Severe Upsets
13. Theory of Arc Interruption in Circuit Breaker
14. Types of Circuit Breakers and their Testing
15. Testing, Commissioning and Maintenance of Relays
16. Recent Developments in Protective Relays
17. PSCAD and Its Application in Power System
18. Smart Grid Technologies and Applications
19. Symmetrical and Unsymmetrical Faults in Power Systems
20. Basic Concept and Application of Controlled Switching

Appendix A—Codes of Protective Devices Used in Control Circuits
Appendix B—Manuals/Data Sheets of Various Types of Relays
Appendix C—System/Line Parameters—Overcurrent Relay Coordination
Appendix D—System/Line Parameters—Simulation of Transmission Line
Bibliography
Additional Multiple Choice Questions
Index
About the Authors.