05340nam 2200685Ia 450 991078444760332120200520144314.01-280-62919-397866106291900-08-045598-0(CKB)1000000000350299(EBL)232138(OCoLC)475938669(SSID)ssj0000225908(PQKBManifestationID)11234612(PQKBTitleCode)TC0000225908(PQKBWorkID)10234681(PQKB)10580744(Au-PeEL)EBL232138(CaPaEBR)ebr10138705(CaONFJC)MIL62919(OCoLC)936898211(MiAaPQ)EBC232138(PPN)170247856(EXLCZ)99100000000035029920050728d2004 uy 0engurcn|||||||||txtccrPractical power system protection[electronic resource] /Les Hewitson, Mark Brown, Ben Ramesh4th ed.Oxford ;Burlington, MA Elsevier/Newnes20041 online resource (289 p.)Includes index.0-7506-6397-9 Cover; Front matter; Half Title Page; Other titles in the series; Title Page; Copyright; Contents; Preface; 1. Need for protection; 1.1 Need for protective apparatus; 1.2 Basic requirements of protection; 1.3 Basic components of protection; 1.4 Summary; 2. Faults, types and effects; 2.1 The development of simple distribution systems; 2.2 Fault types and their effects; 3. Simple calculation of short-circuit currents; 3.1 Introduction; 3.2 Revision of basic formulae; 3.3 Calculation of short-circuit MVA; 3.4 Useful formulae; 3.5 Cable information; 3.6 Copper conductors; 4. System earthing4.1 Introduction 4.2 Earthing devices; 4.3 Evaluation of earthing methods; 4.4 Effect of electric shock on human beings; 5. Fuses; 5.1 Historical; 5.2 Rewireable type; 5.3 Cartridge type; 5.4 Operating characteristics; 5.5 British standard 88:1952; 5.7 Application of selection of fuses; 5.9 Special types; 5.10 General; 5.11 Is-limiter; 6. Instrument transformers; 6.1 Purpose; 6.2 Basic theory of operation; 6.3 Voltage transformers; 6.4 Current transformers; 6.5 Application of current transformers; 6.6 Introducing relays; 6.7 Inverse definite minimum time lag (IDMTL) relay; 7. Circuit breakers7.1 Introduction 7.3 Purpose of circuit breakers (switchgear); 7.4 Behavior under fault conditions; 7.5 Arc; 7.6 Types of circuit breakers; 7.7 Comparison of breaker types; 8. Tripping batteries; 8.1 Tripping batteries; 8.2 Construction of battery chargers; 8.3 Maintenance guide; 8.4 Trip circuit supervision; 8.5 Reasons why breakers and contactors fail to trip; 8.6 Capacitor storage trip units; 9. Relays; 9.1 Introduction; 9.2 Principle of the construction and operation of the electromechanical IDMTL relay; 9.3 Factors influencing choice of plug setting9.5 Universal microprocessor overcurrent relay 9.6 Technical features of a modern microprocessor relay; 9.7 Type testing of static relays; 9.8 The future of protection for distribution systems; 9.9 The era of the IED; 9.10 Substation automation; 9.11 Communication capability; 10. Coordination by time grading; 10.1 Protection design parameters on medium- and low-voltage networks; 10.2 Sensitive earth fault protection; 11. Low-voltage networks; 11.1 Introduction; 11.2 Air circuit breakers; 11.3 Moulded case circuit breakers; 11.4 Application and selective coordination11.5 Earth leakage protection 12. Mine underground distribution protection; 12.1 General; 12.2 Earth-leakage protection; 12.3 Pilot wire monitor; 12.4 Earth fault lockout; 12.5 Neutral earthing resistor monitor (NERM); 13. Principles of unit protection; 13.1 Protective relay systems; 13.2 Main or unit protection; 13.3 Back-up protection; 13.4 Methods of obtaining selectivity; 13.5 Differential protection; 13.6 Transformer differential protection; 13.7 Switchgear differential protection; 13.8 Feeder pilot-wire protection; 13.9 Time taken to clear faults13.10 Recommended unit protection systemsPlant operators, electricians, field technicians and engineers will gain a practical understanding of the role and workings of power system protection systems from this work. An understanding of power systems and their optimized management will increase plant efficiency and performance as well as increasing safety levels. This book provides both the underpinning knowledge and basic calculations needed to understand, specify, use and maintain power protection systems, and the practical techniques required on a daily basis.After studying this book you will have an excellent knowledge ofElectric power systemsElectrical engineeringElectric power systems.Electrical engineering.621.3121621.317Hewitson Les1465719Brown Mark1179673Ramesh Ben1465720MiAaPQMiAaPQMiAaPQBOOK9910784447603321Practical power system protection3675908UNINA