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CTC V.6.5

Steady-state and transient current and temperature calculations of stranded bare overhead conductors

Steady state calculations:

By a given maximum conductor temperature, you can calculate the ampacity (maximum current load), on which the conductor can be operated permanently at any steady weather and ambient condition within ranges close to reality. Exceptions: Rain, snow and frost covered conductor

In opposite, by a given maximum steady-state current load and given or measured steady weather and ambient condition you can calculate the temperature of the conductor.

Steady state calculations can be done according to three independent methods:

     1. CIGRE : This method is based on section 1 of the CIGRÉ document 207

              Thermal behaviour of overhead conductors

    published in August 2002 by the International CIGRÉ Working Group 22.12.



    2. WEBS: This method is based on a calculation method according to ALFRED WEBS, published in Decembre 1963 in the german journal Elektrizitätswirtschaft .

    It was developed to determine the maximum steady-state current load of bare stranded overhead conductors by a given maximum conductor temperature.

    Results of this methods are used to determine the ampacity of bare overhad conductors under defined worst-case ambient conditions for the German Standard DIN 48201.



    3. KIRN: T
    his method is based on a calculation method developed at the Institute of efficient use of energy, University of Applied Sciences, Karlsruhe, Germany by Prof. Dipl. Ing. Herbert KIRN in cooperation with the Badenwerk AG.

    It was published in the magazine ETZ in November 1990 and was
    furthermore refined in some diploma theses.

    It was developed to determine the conductor temperature of ACSR conductors within operating overhead lines for span measurement and sag calculations.

     


Transient current and temperature calculations according to CIGRE

    This calculation method is implemented according to Section 2 :
    Mathematical Model for evaluation of conductor temperature in the unsteady state
    of the CIGRÉ document 207

              Thermal behaviour of overhead conductors

    published in August 2002 by the international CIGRÉ Working Group 22.12.
     

    With this method you can calculate the time-dependent change of the conductor temperature, caused by a change of current.

    You can calculate the period for reaching a given conductor temperature. You can also calculate the causal change of current by giving the time step and the final conductor temperature.

    You can also calculate the final conductor temperature caused from the given change of current over a given time period.

    You can calculate and display up to 6 changes in time, temperature or current within one step.

     

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Last updated: 06.08.2018