The impedance parameters of transmission wires in the traction network are subjected to current-carrying capacity, environment conditions, which will lead to the change of calculation results. In this paper, firstly, the influence of environment conditions on the resistance, reactance, conductivity and admittance parameters of transmission wire is analyzed; Secondly, the calculation method that considers the variation parameters in the traction network is proposed. In the process of calculation, the conductor resistance is taken as the state variable, and the conductor temperature, conductor resistance and power flow are corrected in the process of iterative inverse solution The results show that the change of transmission wire parameters has considerable influence on the results, and the change of impedance parameters should be considered in the process of power flow calculation in the traction network.
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