Carrier Communication over Power Lines (2° Éd., Softcover reprint of the original 2nd ed. 1972)

Carrier communication over power lines, like carrier traffic over postal lines, has a tradition of about 50 years. It has become a vital element in electric system operation. Being restricted to power networks, it has a comparatively limited scope. Nevertheless, great efforts are being ex­ to keep pace with the demands made pended on technical advancement of both power and communication engineering. As in previous editions of this book, it is endeavored in the fourth edition to familiarize the man in the field with the fundamental concepts on which this technique and its practical application are based. The physical and electrical characteristics of the equipment involved are de­ scribed in a general way. For the sake of clarity, the author has refrained from giving a detailed account or illustrations of special versions, espe­ cially as the differences between the equipment supplied by the various manufacturers are so small. This is due to the use of transistors instead of tubes and to the universally adopted plug-in module construction technique. In the load dispatching plants of power supply networks, tele­ metering systems are turning more and more to data engineering methods and equipment to lighten the task of network management. Consequently, at certain points in the text, topics concerning remote data processing are treated, emphasis being placed on transmission channels operating at a considerably higher speed than was usual 10 years ago.

1. Private Communication Networks for Electric System Operation.- 2. Communication Problems in Electric System Operation.- 3. Communication Circuits in the Power Network.- 3.1 Coupling Circuits.- 3.2 Wave Traps.- 3.3 By-Pass-Circuits.- 3 4 Line Coupling in the Light of New Developments.- 4. Properties of Power Lines in the Carrier Frequency Range.- 4.1 Characteristic Impedance of Overhead Power Lines.- 4.2 Attenuation of Overhead Power Lines.- 4.3 Coupling Loss.- 4.4 Impedance Presented by a Power Network Station.- 4.5 Shunting Loss of a Power Network Station.- 4.6 Transit Loss of a Power Network Station.- 4.7 Characteristic Impedance and Attenuation of Power Cables.- 4.8 Attenuation of a Complete Transmission Section.- 4.9 Noise Level.- 5. Characteristics of Power Line Carrier Channels.- 5.1 Transmission Systems.- 5.2 Bandwidth and Frequency Assignment.- 5.3 Transmitter Power and Range.- 5.4 Radiation.- 6. Carrier Communication Networks.- 6.1 Frequency Allocation Scheme.- 6.2 Telephone Networks.- 6.3 Telemetering and Remote Control Networks.- 6.4 Transition to Communication Feeder Lines.- 6.5 Carrier Current Relaying for Network Protection.- 6.6 Portable Carrier Telephone Terminals for Line Crews.- 7. Carrier Communication Terminals.- 7.1 Single-Purpose Equipment.- a) Telephone Terminals.- b) Carrier Terminals for Telemetering and Remote Control.- c) Carrier Terminals for Network Protection and Direct Breaker Tripping.- 7.2 Multi-Purpose Carrier Terminals for Simultaneous Transmission.- 7.3 Multi-Purpose Carrier Terminals for Alternate Transmission.- 7.4 Multi-Channel Carrier Terminals.- 7.5 Survey of Equipment Models.- 7.6 Power Supply.- 8. Measuring Methods and Measuring Equipment.- 8.1 Measuring Methods.- a) Magnitude of Impedance.- b) Real and Imaginary Components.- 8.2 Measurements on a De-Energized Power Line without Line Equipment.- a) Characteristic Impedance.- b) Attenuation.- 8.3 Measurements on an Energized Line.- a) Impedance and Attenuation.- b) Noise Level.- 9. Appendix.- 9.1 Effect of Spur Lines on Carrier Communication Circuits.- 9.2 Effect of Wave Traps.- 9.3 Iron-Coated Power Conductors for Network Decoupling.- 9.4 Network Decoupling by Four-Pole Circuits.- 9.5 Attenuation and Level.- 9.6 Amplitude Modulation in Connection with Double-Sideband and SingleSideband Transmission, Frequency Modulation.- 9.7 Send Power and Transmission Range of Carrier Terminals with the Different Transmission Methods.- a) Transmitter Power.- b) Noise Level and Signal-to-Noise Ratio.- c) Gain Factor of Transmission Method.- d) Practical Application.- 9.8 Table of the 4-Digit Mantissae of Briggs’ Logarithms 100–999.- Bilbliography.