Andrey V. Kryukov, Ilya S. Ovechkin

Irkutsk state transport university, Irkutsk national research technical university

The purpose of the research presented in the article was to develop digital models of traction power supply systems that make it possible to adequately determine the modes of single-phase ground faults in 6-10 kV power lines located in areas of increased electromagnetic influences of traction networks. For their implementation, the Fazonord software product, version 5.3.3.0-2024, was used, which makes it possible to determine power transmission line modes for various methods of connecting transformer neutrals to the ground: isolated neutral, as well as grounding through resistors with low and significant resistance. Simulation of single-phase faults was carried out in the Fazonord software package, version 5.3.3.0-2024, for a system including the following elements: three 110 kV power lines, two substations with 40,000 kV·A transformers, a 25 kV traction network with two contact pendants, four rail threads and a 10 kV line mounted on contact network supports on the field side. Traction loads were created by the movement of two trains weighing 3192 tons in an odd direction and the same number of trains weighing 4192 tons in an even direction. The methodology presented in the article and the computer models developed on its basis make it possible to adequately determine the modes of single-phase ground faults in technological power lines of railway transport. The technique is applicable to power lines and traction networks of any design and can be used in practice to determine single-phase fault modes, configure protection devices against these types of damage, create means of their identification and localization, and select the most effective method of neutral grounding.

technological power lines of railway transport, methods of grounding neutrals, single-phase fault modes, computer models