Analysis of Voltage Drops and Protection Range When Connecting a Large Consumer to the Electrical Grid

This paper contains an analysis of the voltage drops and the protection range when there is a three-phase consumer connected to the electrical grid with load of 45 kW at the electrical grid. When there are many customers that are connected at the end of a radial feeder in low-voltage network it significantly damages voltage conditions as well as the proper functioning of protection range. In order to accomplish the criteria for permitted voltage deviation of ±10 % and different proper criteria functioning of protection range it is necessary to analyze the low-voltage network and intervene in the construction or reconstruction of the low voltage network to function properly after connecting a new consumer. This paper analyzes the connection of the above mentioned consumer at the electrical grid from the substation 20(10)/0.4 kV 'Vrsine 5' at the area of Elektrodalmatia Split.