This study presents a novel high-speed de-excitation system for brushless synchronous machines, where the de-excitation time constant can reach values of several seconds. In these conditions, despite the proper operation of the protection system, the slow de-excitation time constant may produce severe damage in the event of an internal short circuit. With the proposed system, a rapid de-excitation is achieved by inserting a resistance in the field circuit, obtaining a response similar to that in machines with static excitation. This system has been validated through computer simulations and experimental laboratory tests.
IET Electric Power Applications. Volume: 6 Issue: 3 Pages: 156-161
JCR Impact Factor and Scopus quartile: 1.562 - Q1 (2012); 2.211 - Q1 (2017).
DOI reference: 10.1049/iet-epa.2011.0088
Published on paper: March 2012.