Short-circuit currents calculations in street lighting networks

The main feature of street lighting networks is that street lighting feeders usually have a considerable length (up to 1000m). That is the reason why the accurate calculations of short-circuit currents at endpoints of feeders are very important for selection of the feeder protection devices. The protection of people against indirect contact in the event of a fault is considered the most important in outdoor lighting installations. The purpose of the present publication is to introduce a practical method to be used in the MeteorCalc SL software when calculating short-circuit currents in street lighting installations (in three-phase low-voltage radial TN-systems), considering the specific characteristics of these networks. The described procedure fully complies with the IEC 60909 (last edition 2016). The numerical example illustrates all the steps of short-circuit currents calculations in a street lighting network.