DC power system design for telecommunications

Whitham D. Reeve047168161X, 9780471681618, 9780470045022

Straightforward, systematic approach for designing reliable dc power systems for telecommunications Here is a must-have resource for anyone responsible for designing, installing, and maintaining telecommunications systems. The text explains how to design direct current (dc) power systems that operate at nominal voltages of 24 and 48 volts dc, use lead-acid batteries, and are installed in public network telecommunications systems and other exclusive-use environments. Rather than train readers to design systems by rote, the author gives readers the skills and knowledge to perform systematic analyses to make the best choices based on several economic, operational, electrical, and physical considerations. Written in a straightforward style that avoids unnecessary jargon and complex mathematics, the text covers all the essentials of dc power systems for telecommunications: * Detailed descriptions of the seven major system components: Rectifier/charger System, Battery System, Charge Bus, Discharge Bus, Primary Distribution System, Secondary Distribution System, and Voltage Conversion System * Detailed descriptions include design equations, reference tables, block diagrams, and schematics * Design procedures to help readers select the most appropriate power system elements, such as buses, wiring, overcurrent protection, rectifiers, and batteries * Application of the American National Standards Institute’s telecommunications industry standards and other relevant standards, practices, and codes * Strategies for dealing with voltage drop in distribution and battery circuits as well as guidance for sizing circuit wiring to meet voltage drop and current rating requirements * In-depth discussions that focus on the types of lead-acid batteries used in telecommunications and their applications Throughout the text, examples demonstrate how theory is applied to real-world telecommunications systems. Some 330 illustrations and more than 100 tables are also provided to help readers visualize and better understand complex systems. Design and application examples and accompanying solutions help readers understand the design process and use their new skills. In summary, engineers and technicians in the telecommunications industry will find all the resources they need to design reliable dc power systems.

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Table of contents :
DC POWER SYSTEM DESIGN FOR TELECOMMUNICATIONS……Page 3
CONTENTS……Page 7
Preface……Page 11
1.2 Applications Review……Page 13
1.3 Direct Current Power System Elements……Page 17
1.4 Power Sources and Loads……Page 24
1.5 General Design Considerations……Page 30
1.6 Standards, Practices, and Codes……Page 36
2.2 Current Flow……Page 43
2.3 Voltage Sources……Page 44
2.4 Resistance……Page 45
2.5 Wire and Rigid Busbar Conductors……Page 51
2.6 Ohm’s Law and Electrical Circuits……Page 56
2.7 Electrical Power……Page 61
2.8 Current Density……Page 64
2.9 Kirchhoff’s Current and Voltage Laws……Page 67
2.10 Alternating Current……Page 78
References……Page 95
3.1 Nominal System and Operating Voltages……Page 97
3.2 Noise and Transients in dc Power Systems……Page 98
3.3 Rectifier Systems……Page 103
3.4 Powerboard……Page 121
3.5 Monitoring and Control……Page 129
3.6 Primary and Secondary Distribution Systems……Page 134
3.7 Voltage Conversion……Page 147
References……Page 160
4.1 Batteries and Cells……Page 163
4.2 Battery Voltage and Discharge Curves……Page 177
4.3 Temperature Performance……Page 186
4.4 Battery Life……Page 188
4.5 Charge Acceptance and Thermal Runaway……Page 191
4.6 Cell Impedance and Conductance……Page 195
4.7 Short-Circuit Currents……Page 196
References……Page 199
Bibliography……Page 200
5.1 System Design Considerations……Page 201
5.2 Battery System Design……Page 219
5.3 Rectifier System Design……Page 235
5.4 Powerboard Design……Page 245
5.6 Voltage Conversion Systems Design……Page 255
5.7 Other Design Considerations……Page 261
References (Part I)……Page 274
5.8 Circuit Design……Page 275
5.9 Direct Current Power System Bonding and Grounding……Page 379
References (Part II)……Page 390
6.1 Installation Safety Guidelines……Page 393
6.3 Circuit Wiring……Page 394
6.4 Terminal Connector Lugs……Page 397
6.5 Fasteners……Page 403
6.6 Power Wiring Installation……Page 409
6.7 Power Equipment Frames……Page 423
6.8 Auxiliary Framing……Page 424
6.9 Cable Racks……Page 427
6.10 Sleeves, Wall Openings, and Floor Openings……Page 429
6.11 Basic Installation Sequence……Page 430
6.12 Battery System Installation……Page 431
References (Part I)……Page 437
6.13 Overall Maintenance Requirements……Page 438
6.14 Annual System Maintenance Check……Page 440
6.15 Rectifier System Maintenance……Page 441
6.16 Inverter System Maintenance……Page 444
6.17 General Requirements……Page 445
6.18 Vented Lead–Acid Batteries……Page 461
6.19 Valve-Regulated Lead–Acid Batteries……Page 481
6.20 Battery Failure Case Studies……Page 488
References (Part III)……Page 493
Appendix A Comments on Historic dc Power System Configurations……Page 499
Appendix B Mathcad Worksheet Examples……Page 503
Index……Page 507