Event under the auspices of the Ministry of Economy of Slovak Republic

The Impact of Power Line Parameters Asymmetry on Short-circuit Currents in the Comparison with the Standard IEC 60909

Marián Ivanič
Department of Electrical Power Engineering, Slovak Universit

Žaneta Eleschová
Department of Electrical Power Engineering, Slovak University of Technology in Bratislava

Jozef Bendík
Department of Electrical Power Engineering, Slovak University of Technology in Bratislava

Matej Cenký
Department of Electrical Power Engineering, Slovak University of Technology in Bratislava


     Last modified: 2017-06-12

Abstract
The paper analyses the differences arising between the values of the initial short-circuit currents on the parameter unsymmetrical and symmetrical power lines by the use of the relative deviations of short-circuit currents. The short-circuit currents on parameter symmetrical lines are solved according to the standard IEC 60909 which uses the symmetrical coordinate method.
The impacts of ground resistivity and chosen towers of the 400 kV power lines are analysed on differences of short-circuit currents.
The major importance is from the view of dimension of equipments. The short-circuit currents can be higher due to parameters asymmetry than the currents calculated according to the standard IEC 60909. In some cases of short-circuit types the differences of short-circuits on parameter asymmetrical power lines in the comparison with the standard IEC 60909 are higher than 10 %.

 

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