Zkratové výpočty ve střídavých a stejnosměrných sítích

Abstract

This thesis deals with the methodology of calculation of short-circuit conditions in the network caused by adverse atmospheric influences or failures in the individual elements that are installed in the given network. Designing and modeling of DC and AC networks is done in order to analyze their behavior under different types of short-circuits that may occur in practice. The purpose of the calculations is to determine the exact minimum short-circuit values in the networks for setting up protections, which are responsible for the correct and safe operation of individual parts of the network, and also, to determine the maximum short-circuit currents in order to check the short-circuit ratings of individual components in the network. At the end, comparison of mathematical solution according to the standards IEC 60909-0 and IEC 61660-1 and of solution using modeling program DIgSILENT PowerFactory are presented. Calculation errors, deviations and evaluation of individual solution methods are shown as well.