By Heinrich-Karl Podszeck (auth.)
Carrier conversation over energy strains, like service site visitors over postal traces, has a practice of approximately 50 years. It has turn into an essential aspect in electrical procedure operation. Being limited to energy networks, it has a relatively restricted scope. however, nice efforts are being ex to maintain speed with the calls for made pended on technical development of either energy and conversation engineering. As in past versions of this booklet, it truly is endeavored within the fourth version to familiarize the fellow within the box with the basic ideas on which this method and its sensible program are established. The actual and electric features of the gear concerned are de scribed in a common method. For the sake of readability, the writer has kept away from giving a close account or illustrations of certain models, espe cially because the modifications among the gear provided via many of the brands are so small. this is often as a result of use of transistors rather than tubes and to the universally followed plug-in module development procedure. within the load dispatching crops of energy offer networks, tele metering structures are turning an increasing number of to information engineering tools and kit to lighten the duty of community administration. for that reason, at yes issues within the textual content, themes relating distant info processing are handled, emphasis being put on transmission channels working at a significantly better velocity than used to be traditional 10 years ago.
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Extra info for Carrier Communication over Power Lines
The weight of wave traps increases rapidly with inductance and nominal current so that the traps must be mounted on pedestals and can no longer be suspended from wires or cross arms. 2 Wave Traps 37 special insulating supports, which must be rated for the operating voltage, is more expensive than suspension mounting, it is frequently more compatible with the layout of switchyard facilities. In the case of very high short-duration currents, however, suspension mounting is again given preference because it provides for better absorption of the mechanical shocks caused by short circuits, including those in the trap leads.
An unusual application of line equipment has been mentioned in Australian engineering journals . Referring to measurements carried out on a 500 kV experimental installation in the United States of America, suggestions are made to design the line equipment so that it will act both as coupling medium of carrier communication systems and also as a noise reduction circuit. This is to prevent radio interference voltages generated in a station from being radiated from the power lines. Interference above the carrier frequency range (up to 10 MHz) has thereby been reduced by 40%.
Fears that the carrier frequencies might be carried away into other sections of the network are hardly justified in view of the usual 40 cm separation between the conductors of a bundle. The mechanical and the electrical behavior of bundled conductors at power frequencies. 4. Properties of Power Lines in the Carrier Frequency Range 45 both during normal operation and in the event of trouble conditions has been investigated and as far as carrier communication is concerned, measurements have established the fact that these lines meet the expectations derived from theory.