By Heinrich-Karl Podszeck (auth.)
Carrier communique over energy strains, like service site visitors over postal traces, has a convention of approximately 50 years. It has develop into a necessary point in electrical procedure operation. Being limited to strength networks, it has a relatively restricted scope. however, nice efforts are being ex to maintain velocity with the calls for made pended on technical development of either strength and verbal exchange engineering. As in earlier variations of this e-book, it truly is endeavored within the fourth version to familiarize the guy within the box with the elemental techniques on which this system and its functional software are established. The actual and electric features of the apparatus concerned are de scribed in a normal means. For the sake of readability, the writer has avoided giving an in depth account or illustrations of precise types, espe cially because the transformations among the gear provided by means of some 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 building approach. within the load dispatching vegetation of energy provide networks, tele metering structures are turning an increasing number of to info engineering tools and kit to lighten the duty of community administration. accordingly, at yes issues within the textual content, issues pertaining to distant info processing are handled, emphasis being put on transmission channels working at a significantly better velocity than was once ordinary 10 years ago.
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Extra resources for Carrier Communication over Power Lines
14) is essentially a voltage divider designed as a power capacitor with measuring tap. Magnitude and phase of the measuring voltage at the output terminals of the auxiliary transformer are largely made independent of the load with the 26 3. Communication Circuits in the Power Network aid of a compensating choke coil, which is resonated to the sum of the two partial capacitances. The choke coil must not constitute an excessive shunt (due to its capacitances) for the carrier communication currents and a HF choke coil must be connected ahead of it, if necessary.
Arrangement of wave traps in a station. a) wave trap in the line carrying the operating current; b) Wa vo· trap in the lead to the grounding switch; 1 Wave trap; 2 Coupling· capacitor; 3 Protective device; 4 Coupling filter; 5 Disconnect switch; 6 Grounding switch A wave trap is connected directly to the power line and must therefore have an insulation resistance rated for the power voltage. Above all, it must be rated for the full operating current. In the event of power system faults it should display the same short circuit resistance as the power system, i.
26a-c. Three-way by-pass with additional bandpass filters for certain passband ranges (Phase-to-ground coupling). a) Basic circuitry; b) Transmission problem; 0) Passband ranges of directional filters than two carrier frequencies is a comparatively complicated and laborious job. An arrangement including bandpass filters is inherently suited to allowing a number of carrier frequencies to pass. This wide passband range is actually found desirable unless carrier frequencies have to be sent to or received from only one of the two directions in the station to be by-passed.
Carrier Communication over Power Lines by Heinrich-Karl Podszeck (auth.)