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EBOOK
Author Davies, T.
Title Protection of industrial power systems / T. Davies.
Imprint Oxford ; Burlington, MA. : Newnes, 1996.
Edition Second edition.

Subject Electric power systems -- Protection.
Industrial buildings -- Power supply.
Description 1 online resource (xii, 231 pages) : illustrations
Edition Second edition.
Note Includes index.
Contents Front Cover; Protection of Industrial Power Systems; Copyright Page; Contents; Preface to the second edition; Preface to the first edition; Chapter 1. Simple protection devices; Direct-acting trip; Thermal trip; Time-limit fuses; Thermal overload devices; Oil dashpots; Fuses; Moulded-case circuit-breakers; Chapter 2. Relays; Induction relays; Typical applications; Attracted-armature relays; Typical applications; Moving-coil relays; Thermal relays; Timing relays; Design; Static relays; Chapter 3. Current and voltage transformers for protection; Current transformers; Construction; Design.
BurdenOperation; Open-circuited current transformer; Short-time factor; Accuracy limit factor; Specification of current transformers; Rated secondary current; Secondary winding impedance; Primary windings; Application; Effect of CT magnetising current on relay setting; Residual connection; Quadrature or air-gap current transformers; Summation current transformer; Voltage transformers; Accuracy; Protection; Residual connection; Capacitor voltage transformers; Chapter 4. Fault calculations; Impedance; Fault level; Generators; Cables; Source impedance; Motors; Practical example.
Current distributionEarth faults; Chapter 5. Time-graded overcurrent protection; Settings; Time-multiplier setting; Application; Discrimination with fuses; Typical calculation; Earth-fault protection; Directional protection; Directional relays; Very inverse characteristic; Extremely inverse characteristic; High multiples of setting; Chapter 6. Unit protection; Relays; Application; Protection of a motor; CT knee-point voltage; Overall setting; The residual connection; Busbar protection; Phase and earth-fault schemes; Settings; Current setting; Duplicate-busbar protection.
Mesh-connected substationBiased differential protection; Chapter 7. Transformer protection; Types of fault; Differential protection; Magnetising inrush; Tap-changing; Biased systems; High-speed biased systems; Earth-fault protection; Protection of an earthed-star winding; Protection of the delta winding; Buchholz protection; Overcurrent protection; Instantaneous high-set overcurrent protection; Overload protection; Protection of a typical industrial installation; Restricted earth-fault protection; Balanced earth-fault protection; Overcurrent protection; Standby earth-fault protection.
Chapter 8. Feeder protectionDifferential protection; Factors affecting the design; Practical systems; Teed feeder differential protection; Transformer-feeder protection; Intertripping; Auxiliary equipment; Electronic relays; Impedance protection; Chapter 9. Motor protection; Abnormal conditions; Overload protection; Phase unbalance; Stalling; Insulation failure; Settings; Static relays; Differential protection; Loss of supply; Synchronous motors; Chapter 10. Generator protection; Insulation failure; Earthing by resistor; Earthing by transformer; Stator protection; Earth-fault protection.
Summary The protection which is installed on an industrial power system is likely to be subjected to more difficult conditions than the protection on any other kind of power system. Starting with the many simple devices which are employed and covering the whole area of industrial power system protection, this book aims to help achieve a thorough understanding of the protection necessary. Vital aspects such as the modern cartridge fuse, types of relays, and the role of the current transformer are covered and the widely used inverse definite-minimum time overcurrent relay, the theory of the Merz-Price pr.
Note Print version record.
ISBN 9780080515281 (electronic bk.)
0080515282 (electronic bk.)
OCLC # 174141319
Additional Format Print version: Davies, T. Protection of industrial power systems. 2nd ed. Oxford ; Burlington, MA. : Newnes, 1996 9780750626620 (OCoLC)51390153