Silent Sentinels: Protective Relays for A-C and D-C Systems is a comprehensive guide to understanding the importance and functionality of protective relays in electrical systems. Written by the Westinghouse Electric and Manufacturing Company, this book provides a detailed look at how protective relays serve as crucial components in ensuring safety and preventing disasters in both alternating current (A-C) and direct current (D-C) systems.

The book covers a wide range of topics, from the basic principles of protective relays to practical applications and troubleshooting techniques. It explains how protective relays work to detect abnormal electrical conditions, such as overcurrent, voltage fluctuations, or insulation breakdown, and initiate protective actions to prevent damage to equipment or personnel.

The authors do an excellent job of breaking down complex technical concepts into easy-to-understand language, making this book accessible to readers with varying levels of expertise in the field of electrical engineering. Additionally, the detailed diagrams, illustrations, and examples provided throughout the book reinforce key concepts and help readers grasp the material more effectively.

Overall, Silent Sentinels: Protective Relays for A-C and D-C Systems is a valuable resource for engineers, technicians, and students looking to deepen their understanding of protective relays and enhance their knowledge in electrical system protection. Highly recommended for anyone working in the field of electrical engineering.

Book Description:
Possibly the first book concerning the protective relays and schemes used in the generation, transmission, and distribution of electric power. While the technology has changed over the last century, incredibly much of the fundamental theory remains the same. - Summary by Rick Jay