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System for detecting defective point on power transmission line by utilizing satellite

  • US 5,070,537 A
  • Filed: 11/24/1989
  • Issued: 12/03/1991
  • Est. Priority Date: 03/24/1988
  • Status: Expired due to Term
First Claim
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1. A system for detecting a fault location on a power transmission line, said system comprising a master station, and a subordinate station electrically connected to said master station by a transmission circuit;

  • each of said master and subordinate stations comprising;

    a surge detection circuit for detecting a surge voltage generated as a result of cutting of a power transmission line and producing a surge receiving signal indicative thereof;

    a GPS receiver for receiving a transmission from a GPS satellite to generate predetermined periodic pulses, a reset signal, and GPS correction information based on said transmission;

    a time counter/time base connected to said surge detection circuit and said GPS receiver for resetting a time period each time said reset signal is received from said GPS receiver, for converting said predetermined periodic pulses of said GPS receiver into a binary-coded digital signal representative of a time period since a reset, and for receiving said GPS correction information from said GPS receiver and responsively correcting said binary-coded digital signal to produce a corrected binary-coded digital signal said time counter/time base includingmeans for latching said corrected binary-coded digital signal when said surge receiving signal is produced by said surge detection circuit, to generate a surge receiving time signal; and

    communication means, connected to a corresponding communications means at the other station through said transmission circuit, said communications means in said subordinate station for transmitting said surge receiving time signal generated in said subordinate station therefrom to said master station; and

    said master station further comprising a processor controller connected to said time counter/time base and said communication means for comparing said surge receiving time signal generated in said master station with said surge receiving time signal generated in said subordinate station and transmitted to said master station and for generating a signal representative of a distance to a fault point on said power transmission line based on said comparing.

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