Method for calculating OPGW optical cable short circuit current heat effect by using improved synthetic method

Method for calculating OPGW optical cable short circuit current heat effect by using improved synthetic method

  • CN 101,697,291 B
  • Filed: 10/19/2009
  • Issued: 04/29/2015
  • Est. Priority Date: 10/19/2009
  • Status: Active Grant
First Claim
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1. the method utilizing improved integration algorithm to calculate OPGW optical cable Short circuit current heating effect, given line construction and physical dimension relation, given current strength or effective value, the structure of given or selected optical cable and relative dimensions, the given short circuit current duration, time and cable size are carried out segment processing respectively, utilize initial condition, start the parameter solving subsequent period, the distribution of electric current on each medium is solved according to skin effect, according to heating effect of current principle, heat is solved by the electric current in this this region of period, and then solve this regional temperature, heat exchange is solved by this temperature, and ask this zone resistance, and and then ask CURRENT DISTRIBUTION again, heat and temperature is asked again by CURRENT DISTRIBUTION, so repeatedly, until complete the calculating of preset time, it is characterized in that specifically comprising the following steps:

  • First suppose;

    in OPGW optical, the temperature of each monofilament is identical with air in the t=0 moment, i.e. T (0)=ambient temperature;

    Input parameter is;

    in OPGW optical, the radius r of each monofilament, material and characterisitic parameter thereof comprise;

    density, conductivity and temperature coefficient, length l, the geometry space D between itself and power line and the current peak I in power line and phase place;

    Output rusults;

    the stable temperature of OPGW optical;

    Concrete steps are;

    The first step;

    ask for coefficient of mutual inductance

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