Návrh a nastaveni elektrických ochran vývodů rozváděče 6,6 kV na lodi

Abstract

Purpose of this thesis is calculation and set up electrical protection rele of 6,6 kV switchboard. At the beginning of this thesis is given theory about protection rele and short circuit currents. Onwards is in full details described HV switchboard, his parts,equipment, and also protection reles as well. In practical part of this thesis is the 6,6 kV network, switchboard number 1 and the transformator protections descibed. To confirm fault current withstand and for protection reles is calculated maximum and minimum short circuit fault current. At the end of this work is described how to set up the protection reles for overcurrent, eart-fault current and undervoltage.