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%0 Thesis %A Krampert, Thomas %T Ausschaltverhalten von Mittelspannungs-Lasttrennschaltern auf Basis von Stickstoff-Kohlenstoffdioxid-Mischungen %V 214 %I RWTH Aachen University %V Dissertation %C Aachen %M RWTH-2022-01010 %@ 978-3-9822584-9-2 %B Aachener Beiträge zur Energieversorgung %P 1 Online-Ressource : Illustrationen %D 2022 %Z Druckausgabe: 2022. - Auch veröffentlicht auf dem Publikationsserver der RWTH Aachen University %Z Dissertation, RWTH Aachen University, 2021 %X In the medium-voltage level, load-break switches are the most commonly installed switchgear in Germany and thus represent an important component of the electrical power supply. Due to the requirement for compact size, an increasing proportion is installed in gas-insulated switchgear. The sulfur hexafluoride used for this purpose is the strongest known greenhouse gas with a global warming potential of 23 500 CO2 mass equivalents, which is why substitution is being sought. However, since the gases under consideration for this purpose have lower performance, an adaptation of the switch design is necessary. The key factors for successful current interruption are arc cooling by axial blowing and the hartgas effect, i.e. the burning off of polymers in the arc region. In a previous work, a first design criteria catalog has already been developed. However, a deeper understanding of all relevant influencing factors is necessary for the optimal design of a medium-voltage load-break switch. The aim of this work is to investigate the influence of the switch design and the current and voltage stress on the breaking behavior of an environmentally friendly medium-voltage load-break switchbased on nitrogen-carbon dioxide mixtures. Of particular interest is the effect of individual parameters on the interaction of axial blowing and hardgas effect. In the investigations, the thermal interruption capability, the dielectric recovery as well as the current chopping behavior for different design variants are determined for a model switch. The investigations show that designs that lead to higher polymer ablation do not automatically have a higher breaking capability, but that a sufficiently high blowing pressure is required to exploit the changed gas composition due to polymer ablation. Design criteria are derived from the investigations and used to design a technology demonstrator. The validity of the design criteria is verified by testing the interruption capability of the technology demonstrator in accordance with the standards. %F PUB:(DE-HGF)11 ; PUB:(DE-HGF)3 %9 Dissertation / PhD ThesisBook %R 10.18154/RWTH-2022-01010 %U https://publications.rwth-aachen.de/record/840061