One of the main criticisms when it comes to the topic of electricity is certainly infrastructure. But if the desire to expand electric mobility to as many people as possible, it will not be only the cars that are involved. In fact, mainly in northern Europe, in countries like Germany, a slice of public transport is embracing the cause of electricity. In some German cities, state subsidies have been made for the purchase of electrified buses. Therefore, infrastructure suitable for new needs is also needed.
In the cities of Leipzig and Nuremberg Two pilot projects are underway, led, from a technological point of view, by the Siemens Group which has studied two different solutions, but functional to the public transport of the two cities. They can be considered more traditionalist than other types of projects, which feature electric buses and the way of charging. In fact, work is underway in Poland on the possibility of directly replacing the battery pack to the vehicle intended for public transport, with one already charged.
As for the two German cities instead, the project developed by Siemens envisages the installation of particular columns, capable of guaranteeing high charging power. These columns will be placed in the night bus depots. In this way, a system has been designed that allows you to connect to the electricity grid, bypassing a whole series of potential critical issues, making energy flows more efficient. Construction work has already started and the system is expected to start operating in 2021. Among other things, Siemens will have to install medium voltage switchboards and transformers for connection to the grid and low voltage switchboards to distribute electricity within the deposits at individual charging stations.
There are 21 UC 100 100 kW columns in Leipzig and 5 450 kW UC 600 columns. So up to 21 buses can be connected. The singular thing that to access the charging infrastructure, the buses will be equipped with a special pantograph which, in contact with electrical cables, will recharge the batteries. In Nuremberg, on the other hand, there will be 20 UC 200 charging stations with 150 kW power. Each column will allow simultaneous charging of two buses. Solar panels will “support” the system.
June 24, 2020 (change June 24, 2020 | 11:59 a.m.)
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