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Filtering device for high-voltage power lines used as high-frequency transmission media

  • US 4,136,319 A
  • Filed: 03/23/1977
  • Issued: 01/23/1979
  • Est. Priority Date: 03/26/1976
  • Status: Expired due to Term
First Claim
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1. A filtering device for use at an end of an isolation section in a high-voltage electricity distribution network;

  • the network comprising energy-transporting line sections which extend between sub-stations and which additionally perform the function of transmission media for high-frequency carrier-wave telecommunications between communications sets of adjacent ones of the sub-stations;

    the carrier-waves lying in a frequency range Δ

    F which extends between a lower frequency f and an upper frequency F;

    the isolation section being one of said line sections over which telecommunications take place in n frequency bands lying within said frequency range Δ

    F and none of which n bands are used in any of the other line sections connected to the sub-stations of the said isolation section;

    the filtering device comprising;

    a blocking filter comprising an inductance for connection in series between the end of the isolation section and the sub-station, and a tuning circuit connected in parallel with the inductance and adjusted to block frequencies in the lower part of said frequency range Δ

    F;

    a capacitor with one terminal connected to the isolation section side of said blocking filter;

    a drain coil connected in series between the other terminal of the capacitor and earth; and

    a selective filter assembly connected in parallel with said drain coil and adjusted to stop the said n frequency bands of the isolation section.

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