Short description
This book provides an understanding of various power system components and their failure modes as well as the various types of protective relays used to detect and isolate abnormal power system conditions. The author shows readers how to recognize conditions and system configurations where power system protection can be optimized. He also discusses applications and control schemes used to ensure proper protective relay actuation and considers set points for protective relays intended to detect short circuits on distribution lines, transmission lines, transformers, and buses. Additionally, the text examines several schemes used to detect that a circuit breaker has failed to interrupt the flow of a fault current.
Long description
This title lets you improve failure detection and optimize protection. In the ever-evolving field of protective relay technology, an engineer's personal preference and professional judgment are as important to power system protection as the physical relays used to detect and isolate abnormal conditions. With invaluable insights from an experienced expert, Protective Relay Principles focuses on probable power system failure modes and the important characteristics of the protective relays used to detect these postulated failures.This book presents useful new concepts in a way that is easier to understand because they are equally relevant to older, electromechanical and solid-state relays, and newer, more versatile microprocessor-based relays. It introduces the applications, considerations, and setting philosophies used in transmission-line, distribution-line, and substation applications, covering concepts associated with general system operations and fault detection. The topics include relay load limits, cold load pickup, voltage recovery, and arc flash.The author also delves into the philosophies that engineers employ in both urban and rural areas, with a detailed consideration of setpoint function. It presents an analysis of key concepts that are usually just glossed over. This versatile text is ideal for new engineers to use as a tutorial before they open the instruction manuals that accompany multi-function microprocessor-based relays. Guiding readers through the transient loading conditions that can result in relay misoperation, the author elaborates on concepts that are not generally discussed, but can be very helpful in specific applications. Readers will come away with an excellent grasp of important design considerations for working with overcurrent, over- and undervoltage, impedance, distance, and differential type relay functions, either individually or in combination. Also useful for students as a textbook, this book includes practical examples for many applications, and offers guidance for more unusual ones.