Features of calculation of critical currents in semiconductor elements of thyristor-reactor switching device used for voltage regulation

Abstract

The paper presents a refined method for calculation of critical currents flowing through thyristors of a thyristor-reactor switching device aimed at voltage regulation at traction substations on railways electrified with direct current. The method considers overcurrent of thyristors in a dynamic mode of operation that occur in result of discharge of accumulated energy in inductive elements of the device. The authors have calculated critical currents flowing through thyristors of the switch being a part of the perspective converter transformer TRSNP-12500/10 that has a 14 % range of voltage regulation.