In the assignment, I focused on studying the use of battery accumulators at key points in electric
traction. To begin with, I gave an overview of the current situation and the development of
railway electrification in Slovenia. I paid attention to a detailed description of the operation of
electric power stations (ENP) and driving networks (VO), which are key to ensuring the smooth
operation of the electric traction system.
In the following, I explored existing grounding methods and highlighted the challenges
associated with touch voltage that can threaten the safe operation of the system and the safety
of users. I performed a potential analysis on the return line and looked at how protective devices
can help to control these problems. In the measurements I got on behalf of Slovenian railways
at the Otoče railway station, I found that the current infrastructure is not strong enough to
effectively handle the growing traffic loads, which causes an increase in the potential on the
return conductor. This suggests that the existing system may not be able to meet increased
energy needs in the future.
I touched on the calculation of the energy consumption of the train on the Kranj - Žirovnica
line section, where the batteries would be installed. By calculating the energy consumption and
the slope of the track in the Otoče area, I gave a conclusion of the reasons for the operation of
protective devices during normal operation.
As a solution to these problems, I proposed the introduction of lithium-iron-phosphate (LFP)
batteries as an additional electrical power station (ENP). These batteries could significantly
contribute to the stabilization of the voltage in the network, as they enable the storage of energy
obtained during the regenerative braking of trains and its release in times of increased energy
needs. With the help of calculations, I determined the appropriate capacity of the batteries so
that they could effectively serve as an additional power source. Calculations showed that the
introduction of a battery system could reduce the touch voltage and improve the overall
performance of the power system.
In the end, I concluded that the integration of batteries into the electric traction network would
represent a long-term and effective solution for improving the reliability and safety of the
railway system. They could handle the increase in traffic today and in the future.
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