Statistical Methods for Identifying Small Differences in the Thermal Interruption Performance of SF6 Alternatives
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Date
2023-08-08
Publication Type
Journal Article
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yes
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Abstract
A paradigm shift is underway in high-voltage power transmission, with long-standing SF6-insulated designs being phased out in favor of alternatives with lower global warming potential. A number of proposed solutions for SF6-free gas circuit-breakers use CO2-based mixtures. In such mixtures the thermal switching behavior is mainly set by the CO2 base gas, making the influence of additives challenging to detect experimentally. To investigate the switching processes in these mixtures, a test device based on the puffer circuit-breaker principle has been developed, enabling the study of pure gas properties under highly controlled conditions [2]. This contribution will present thermal interruption limit measurements performed with this device, and establish a statistical method to assess the reignition probability as a function of the prospective current slope. The method will be used to show that the interruption limit in CO2 follows a blow pressure scaling of 3.1 A/μs√bar . Using this approach, the interruption limit may be determined with an uncertainty much smaller than the scatter of individual test results, thereby allowing small changes in interrupting performance to be detected.
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published
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Journal / series
Volume
10 (1)
Pages / Article No.
36 - 39
Publisher
Czech Technical University in Prague, Faculty of Electrical Engineering, Department of Physics
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Subject
switching arcs; gas circuit breakers; thermal interruption; CO2; SF6 Alternatives
Organisational unit
03869 - Franck, Christian / Franck, Christian