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Apparatus for and method of attenuating power line carrier communication signals passing between substation distribution lines and transmission lines through substation transformers

  • US 4,602,240 A
  • Filed: 03/22/1984
  • Issued: 07/22/1986
  • Est. Priority Date: 03/22/1984
  • Status: Expired due to Fees
First Claim
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1. The method of reducing crosstalk between three-phase power line carrier transceivers situated at two remote three-phase substation electric power distribution networks that are electrically interconnected through (i) a three-phase transmission line and (ii) substation transformers at opposite ends of the transmission line, where the transceivers are intended to communicate only with other communication devices within a given substation power distribution network, comprising the steps of:

  • capacitively coupling each of the three-phase lines of each distribution network together in a wye connection to form a capacitor bank at a point between the transceiver and the substation transformer at each substation experiencing substantial crosstalk where the capacitive values are such as to substantially block signals at the electric power frequency and provide substantially no blocking effect at the transceiver carrier frequency; and

    connecting the common point of said wye-connected capacitor bank to neutral through a shunt inductance where the inductance is of such a value that there is a high ratio of desired communication signal to crosstalk communication signal, the capacitor bank and shunt inductance at each distribution network at each end of the interconnecting electrical transmission line along with the intermediate reactances connecting the capacitor banks forming a three-phase balanced pi communication frequency attenuation circuit in which the capacitor bank and the associated shunt inductance at each distribution network form a series combination that is in shunt relationship with the main path of the communications signal in the associated distribution network.

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