Návrh a nastavení elektrických ochran pro rozvodnu R 22kV Vsetín

Abstract

The diploma thesis deals with a theoretical analysis of electrical protection and short-circuit currents. In the practical part, the protections are set in the substation R22kV Vsetín. This substation supplies a relatively large mountain power lines, which can reach tens of kilometers in length. This results in relatively low short-circuit currents at the end of long sections. The calculations of short-circuit currents are based on the knowledge of the power and short-circuit voltages of transformers, the power and subtransient reactance of generators and the short-circuit power of the superior system. When calculating the impedance of the line, its reactance and resistance are considered. There is the check whether there is no overloading of PTP converters. Non-directional overcurrent protections, short-circuit protections, directional ground-fault protections and AOZ will be used to protect 22 kV lines.