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Power transmission line monitoring system

  • US 5,181,026 A
  • Filed: 12/19/1990
  • Issued: 01/19/1993
  • Est. Priority Date: 01/12/1990
  • Status: Expired due to Fees
First Claim
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1. A power transmission line monitoring system comprising;

  • current sampling means for sampling current on a power transmission line;

    rectifying means for rectifying the output of said current sampling means;

    power supply means connected to the output of said rectifying means for producing regulated filtered electrical power;

    line voltage sensing means connected to said power transmission line, said line voltage sensing means including a voltage divider comprised of a small resistance connected to said power transmission line in series with a very large resistance connected to earth ground;

    signal processing means for receiving and processing the data output of said line voltage sensing means, signal processing means including data processing and data transmission means for transmitting said data output of said line voltage sensing means across the line to ground voltage gradient to a ground receiving and data processing station located remotely from said power transmission line, said data transmitting means comprising a fiber optic data transmission cable that includes said very large resistance of said voltage divider;

    voltage divider current loss measuring circuit means for measuring current loss across said voltage divider by the continuous measurement and comparison of the current magnitude at the power line end of said line voltage sensing voltage divider with the current magnitude at the earth ground end of said line voltage sensing voltage divider, said comparison data processing performed at said ground receiving and data processing station, said voltage divider power line end current magnitude measured by said line voltage sensing means, and said voltage divider earth ground end current magnitude measured by a voltage divider earth ground end current sensing circuit means, said voltage divider earth ground end current sensing circuit means being part of said ground receiving and data processing station; and

    a common system return connecting said current sampling means, said rectifying means, said power supply means, said line voltage sensing means, and said signal processing means to said power transmission line whereby system circuits are isolated from earth ground by using the power transmission line as a reference and as the common system circuitry return.

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