Method for determining time when obtaining current measuring value and protection system for power networks

Method for determining time when obtaining current measuring value and protection system for power networks

  • CN 1,489,819 B
  • Filed: 01/29/2002
  • Issued: 05/29/2013
  • Est. Priority Date: 01/31/2001
  • Status: Active Grant
First Claim
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1. be used for to determine by first and the first protection equipment and the second protection equipment (3A of second point laying respectively on the power line (2) away from each other for one kind;

  • the method of the Measuring Time of the current measurement value that 3B) obtains;

    described the first protection equipment and the second protection equipment (3A;

    3B) be the part of synchronous digital hierarchy type communication network;

    the first current measurement value gathers at the first protection equipment (3A);

    this the first protection equipment send to the second protection equipment (3B) Measuring Time comprise the first current measurement value and to obtain this current measurement value to external signal S1;

    the second current measurement value gathers at the second protection equipment;

    this the second protection equipment sends to the first protection equipment and comprises the first and second current measurement values and the inverse signal S2 that obtains the Measuring Time of this current measurement value;

    described the first protection equipment and the second protection equipment (3A;

    3B) by being used for sending at least two bars transmission paths exchange signal to external signal S1 and inverse signal S2;

    the timing that it is characterized in that two measured values utilizes gps signal synchronous; and

    calculated and be stored in to total propagation time tp1+tp2 of external signal and inverse signal and be positioned at described the first protection equipment and the second protection equipment (3A;

    in the memory 3B) (11);

    wherein;

    if lose gps signal;

    the total propagation time that obtains during the total propagation time that then will store and gps signal disappear relatively;

    whether changed by the signal transmission path to external signal S1 and inverse signal S2 process to judge on the synchronous digital hierarchy type communication network;

    when comparative result is identical, can determine not changed by the signal transmission path to external signal S1 and inverse signal S2 process on the synchronous digital hierarchy type communication network and utilize total propagation time of storage to calculate inverse signal with respect to the actual measurement time tB3 to external signal.

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