Andrey V. Kryukov, Aleksandr V. Cherepanov, Nguyen Quoc Hieu

Irkutsk State Transport University, Irkutsk National Research Technical University

The purpose of the research presented in this article was to develop digital models for determining the melting modes of ice on the overhead wires of DC railways. The models were implemented in the Fazonord software package, version 5.3.4.9 –2024. The calculation algorithm included the following stages: determination of a series of modes determined by the train schedule, based on an approach using phase coordinates; calculations of the dependences of currents flowing through wires on time; calculation of their heating temperatures over time intervals; calculation of indicators of the process of melting ice-covered grooves; taking into account the evaporation of the water film remaining after the ice sleeve falls off; modeling of heating of wires free from ice, taking into account a possible increase in heat transfer due to drizzle or rain. The initial data necessary for the calculations are described. They include the following groups of parameters: geometric, thermal and electrical. Computer models are presented that take into account the main factors of the processes of heating and removing icing deposits on overhead wires of DC traction networks. The simulated traction power supply system included the following elements: three 110 kV supply power lines; three traction substations; two sections of 3 kV traction network with a length of 20 km. It has been shown that ice is removed from support cables in 17 minutes, and from contact wires in 22 minutes. The heating temperatures of current-carrying parts during melting do not exceed permissible values. The temperatures of the hottest points of traction transformers were determined. It has been shown that melting does not cause unacceptable overheating of transformers. The technique is universal and can be used for traction networks of any design.

deicing, DC railways, power supply systems