Heinrich-Karl Podszeck (auth.)'s Carrier Communication over Power Lines PDF

By Heinrich-Karl Podszeck (auth.)

ISBN-10: 3662244217

ISBN-13: 9783662244210

ISBN-10: 3662265613

ISBN-13: 9783662265611

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The VDEW (Association of German Power Companies), for instance, recommends for Germany a certain grading as to rated currents and associated short circuit resistances (Fig. 16). Thermal limit currenb refers to the maximum rms value of the current stated in ka, whose thermal effect the wave trap will withstand for a period of one second, following a continuous loading with rated current under standardized temperature conditions. The dynamic limit current is the maximum value of the first current amplitude in ka, whose mechanical effects the wave trap must be designed to withstand [51].

The requirement for by-pass circuits excluding the possibility of an electric shock hazard are met if each capacitor is grounded through a sufficiently large inductance. In one of the earliest types of by-pass circuits (Fig. 25a) this precautionary measure had not yet been taken Fig. 25a- d. Dg. a) By-pass with tuning coil between capacitors; b) By-pass With metallically s eparated arms and coupled telephone station; c) By-pass resonated to two carrier frequencies; d) By-pass with bandpass filters tor a broad frequency band This shortcoming was eliminated later when both arms of the by-pass were inductively coupled (Fig.

This is the reason why a separating point cannot be bridged simply by providing a capacitor. The requirement for by-pass circuits excluding the possibility of an electric shock hazard are met if each capacitor is grounded through a sufficiently large inductance. In one of the earliest types of by-pass circuits (Fig. 25a) this precautionary measure had not yet been taken Fig. 25a- d. Dg. a) By-pass with tuning coil between capacitors; b) By-pass With metallically s eparated arms and coupled telephone station; c) By-pass resonated to two carrier frequencies; d) By-pass with bandpass filters tor a broad frequency band This shortcoming was eliminated later when both arms of the by-pass were inductively coupled (Fig.

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Carrier Communication over Power Lines by Heinrich-Karl Podszeck (auth.)


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