DC Power System Design for Telecommunications

Whitham D. Reeve

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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.

 

Table of Contents

Preface.

1 Introduction.

1.1 Basic Requirements for Telecommunications Power Systems.
1.2 Applications Review.
1.3 Direct Current Power System Elements.
1.4 Power Sources and Loads.
1.5 General Design Considerations.
1.6 Standards, Practices, and Codes.

2 Electricity Review.

2.1 Electromotive Force.
2.2 Current Flow.
2.3 Voltage Sources.
2.4 Resistance.
2.5 Wire and Rigid Busbar Conductors.
2.6 Ohm's Law and Electrical Circuits.
2.7 Electrical Power.
2.8 Current Density.
2.9 Kirchhoff's Current and Voltage Laws.
2.10 Alternating Current References.

3 dc Power System Components.

3.1 Nominal System and Operating Voltages.
3.2 Noise and Transients in dc Power Systems.
3.3 Rectifier Systems.
3.4 Powerboard.
3.5 Monitoring and Control.
3.6 Primary and Secondary Distribution Systems.
3.7 Voltage Conversion References.

4 Telecommunications Batteries.

4.1 Batteries and Cells.
4.2 Battery Voltage and Discharge Curves.
4.3 Temperature Performance.
4.4 Battery Life.
4.5 Charge Acceptance and Thermal Runaway.
4.6 Cell Impedance and Conductance.
4.7 Short-Circuit Currents.
4.8 Cell Gassing and Ventilation References Bibliography.

5 System Design.

Part I Direct Current Power Systems Component Design.
5.1 System Design Considerations.
5.2 Battery System Design.
5.3 Rectifier System Design.
5.4 Powerboard Design.
5.5 Secondary Distribution Design.
5.6 Voltage Conversion Systems Design.
5.7 Other Design Considerations References (Part I).

Part II Direct Current Power Systems Circuit Design.
5.8 Circuit Design.
5.9 Direct Current Power System Bonding and Grounding References (Part II).

6 System Installation and Maintenance.

Part I Direct Current Power System Installation.
6.1 Installation Safety Guidelines.
6.2 Material Compatibility.
6.3 Circuit Wiring.
6.4 Terminal Connector Lugs.
6.5 Fasteners.
6.6 Power Wiring Installation.
6.7 Power Equipment Frames.
6.8 Auxiliary Framing.
6.9 Cable Racks.
6.10 Sleeves, Wall Openings, and Floor Openings.
6.11 Basic Installation Sequence.
6.12 Battery System Installation References (Part I).

Part II System Maintenance.
6.13 Overall Maintenance Requirements.
6.14 Annual System Maintenance Check.
6.15 Rectifier System Maintenance.
6.16 Inverter System Maintenance.

Part III Battery System Maintenance.
6.17 General Requirements.
6.18 Vented Lead–Acid Batteries.
6.19 Valve-Regulated Lead-Acid Batteries.
6.20 Battery Failure Case Studies References (Part III).

Appendix A. Comments on Historic dc Power System Configurations.

Appendix B. Mathcad Worksheet Examples.

Index.