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Line disturbance monitor and recorder system

  • US 5,216,621 A
  • Filed: 02/28/1991
  • Issued: 06/01/1993
  • Est. Priority Date: 02/28/1991
  • Status: Expired due to Term
First Claim
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1. A fault detection system for monitoring at least one operating parameter of an AC power transmission line, comprising:

  • input means connectable to the transmission line for providing at least one analog signal representative of a time varying value of the at least one operating parameter;

    an analog-to-digital (A/D) converter connected to said input means for sampling said at least one analog signal and producing digital sample words representing the signal;

    trigger means connected to receive said digital sample words from said A/D converter for operating on said digital sample words to detect a disturbance in the at least one operating parameter and for generating a trigger signal when a disturbance is detected; and

    storage means for storing said digital sample words received from said A/D converter, said storage means including;

    a plurality of memory zones for storing newly acquired data in storage locations within each memory zone;

    memory pointer means for sequentially addressing said plurality of memory zones in a loop for sequential storage of said digital sample words in said storage locations of the addressed memory zone; and

    control means, connected to said trigger means, for removing at least one of said plurality of memory zones from said loop addressable by said memory pointer means, in response to receipt of said trigger signal;

    wherein said memory pointer means continues to sequentially address the remaining ones of said plurality of memory zones in said loop as new digital sample words are received by said storage means.

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