By Heinrich-Karl Podszeck (auth.)
Carrier conversation over strength traces, like provider site visitors over postal strains, has a practice of approximately 50 years. It has develop into an essential point in electrical method operation. Being limited to strength 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 communique engineering. As in earlier variations of this publication, it really is endeavored within the fourth version to familiarize the guy within the box with the basic innovations on which this system and its sensible program are dependent. The actual and electric features of the gear concerned are de scribed in a basic manner. For the sake of readability, the writer has kept away from giving an in depth account or illustrations of distinct types, espe cially because the alterations among the apparatus provided through a number of the brands are so small. this can be a result of use of transistors rather than tubes and to the universally followed plug-in module development strategy. within the load dispatching vegetation of strength offer networks, tele metering platforms are turning progressively more to facts engineering tools and kit to lighten the duty of community administration. hence, at convinced issues within the textual content, subject matters pertaining to distant facts processing are taken care of, emphasis being put on transmission channels working at a significantly better pace than used to be traditional 10 years ago.
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Extra info for Carrier Communication over Power Lines
12), a distinction is made between "two-phase coupling", formerly adopted to improve reliability of transmission in the event of a breakage of one of the coupled conductors, "phase-to-phase coupling", using again two conductors of a three-phase system, and "inter-system coupling", where one conductor each of two three-phase systems suspended from a common tower is used. A connection may also be made between a single phase of a power line and ground. This method is called "phase-to-ground coupling".
Thus, the inherent capacitance of the coil is about 10 % of the tuning capacitance and must therefore be taken into account when resonating the traps. A low-inductance choke coil of the type required for resonant traps is invariably designed as a single-layer cylindrical coil. This simple and inexpensive design is retained also for larger inductances as far as this is compatible with dimensions and material requirements. For higher inductances, a disc-shaped coil turned out to be a more favorable solution.
With phase-to-phase coupling, the major portion of the energy transmitted will be found between the coupled conductors. It is propagated between these conductors in the form of an electromagnetic wave. The portion between the conductors and ground is comparatively small. If complete balance is achieved, the third conductor will not carry any carrier current. Even in the usual, less accurately balanced arrangements, the third conductor, like the ground wire, takes little part in message communication.
Carrier Communication over Power Lines by Heinrich-Karl Podszeck (auth.)