Ieee Std C37 17 2012 Revision Of Ansi C37 17 1997

IEEE Std C37.17-2012 (Revision of ANSI C37.17-1997 )

IEEE Standard for Trip Systems for Low-voltage (1000 V and Below) AC and General Purpose (1500 V and Below) DC Power Circuit Breakers

Abstract: Requirements for direct acting current and voltage protective functions of direct-acting overcurrent electromechanical trip devices, direct-acting overcurrent electronic trip systems, reverse-current trip systems for dc circuit breakers, and undervoltage trip devices that are integral with low-voltage ac (1000 V and below) and general purpose low-voltage dc (1500 and below) power circuit breakers covered by IEEE Std C37.13, IEEE Std C37.14, and IEEE Std C37.16 are included in this standard. Additional information, communication and/or additional internal or external protective functions or devices are not covered (but also not restricted) by this standard. Keywords: Direct-acting trip, ground fault, I2t, IEEE C37.17, i-squared-t, instantaneous, longtime, low-voltage power circuit breaker, power system protection, short-time, time-overcurrent, trip unit.

Arc Flash Hazard Analysis and Mitigation

Up-to-date analysis methodologies and practical mitigation for a major electrical safety concern Arc Flash Hazard Analysis and Mitigation is the first book to focus specifically on arc flash hazards and provide the latest methodologies for its analysis as well as practical mitigation techniques. Consisting of sixteen chapters, this fully up-to-date handbook covers all aspects of arc flash hazard calculations and mitigation. It addresses the calculations of short circuits, protective relaying, and varied electrical systems configurations in electrical power systems. It also examines protection systems, including differential relays, arc flash sensing relays, protective relaying coordination, current transformer operation and saturation, and applications to major electrical equipment from the arc flash point of view. Current technologies and strategies for arc flash mitigation are explored. Using the methodology, analysis, and preventive measures discussed in the book, the arc flash hazard incident energy can be reduced to 8 cal/cm2 or less for the new and existing electrical distribution systems. This powerful resource: Features the most up-to-date arc flash analysis methodologies Presents arc flash hazard calculations in dc systems Supplies practical examples and case studies Provides end-of-chapter reviews and questions Includes a Foreword written by Lanny Floyd, a world-renowned leader in electrical safety who is DuPont's Principal Consultant on Electrical Safety and Technology Arc Flash Hazard Analysis and Mitigation is a must-have guide for electrical engineers engaged in design, operation, and maintenance, consulting engineers, facility managers, and safety professionals.