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@PHDTHESIS{Krampert:840061,
author = {Krampert, Thomas},
othercontributors = {Moser, Albert and Schnettler, Armin},
title = {{A}usschaltverhalten von
{M}ittelspannungs-{L}asttrennschaltern auf {B}asis von
{S}tickstoff-{K}ohlenstoffdioxid-{M}ischungen},
volume = {214},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Aachen},
publisher = {printproduction M. Wolff},
reportid = {RWTH-2022-01010},
isbn = {978-3-9822584-9-2},
series = {Aachener Beiträge zur Energieversorgung},
pages = {1 Online-Ressource : Illustrationen},
year = {2022},
note = {Druckausgabe: 2022. - Auch veröffentlicht auf dem
Publikationsserver der RWTH Aachen University; Dissertation,
RWTH Aachen University, 2021},
abstract = {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.},
cin = {614110},
ddc = {621.3},
cid = {$I:(DE-82)614110_20140620$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2022-01010},
url = {https://publications.rwth-aachen.de/record/840061},
}
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