Negative DC Breakdown Characteristics of C 3 F 7 CN / CO 2 Gas Mixture for Application in High Voltage Accelerators

This study investigates the technical feasibility of retro-filling a C 3 F 7 CN/CO 2 gas mixture for existing SF 6 -insulated accelerators. Negative DC breakdown characteristics of 20% C 3 F 7 CN / 80% CO 2 gas mixture and SF 6 for varying pressure, gap distance and field uniformity are analyzed exp...

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Bibliographic Details
Published in:IEEE transactions on dielectrics and electrical insulation 2021-06, Vol.28 (3), p.946-954
Main Authors: Iddrissu, Ibrahim, Chen, Lujia, Bahdad, Faisal Omar, Dabin, John, Joassin, Denis, Maksoud, Louis, Kieffel, Yannick
Format: Article
Language:English
Subjects:
Accelerators
Breakdown
Carbon dioxide
Configurations
Feasibility studies
Gas mixtures
Insulation
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Summary:This study investigates the technical feasibility of retro-filling a C 3 F 7 CN/CO 2 gas mixture for existing SF 6 -insulated accelerators. Negative DC breakdown characteristics of 20% C 3 F 7 CN / 80% CO 2 gas mixture and SF 6 for varying pressure, gap distance and field uniformity are analyzed experimentally using four distinctly different electrode configurations. The C 3 F 7 CN/CO 2 gas mixture shows a higher breakdown strength than SF 6 for configurations with high field uniformity, whereas SF 6 outperforms C 3 F 7 CN/CO 2 gas mixture under the non-uniform field. Importantly, 20% C 3 F 7 CN / 80% CO 2 gas mixture exhibits comparable insulation capability to SF 6 in a 10/30 mm coaxial geometry with similar field uniformity as found in the practical gas-insulated equipment. The results of this work contribute to the development of a potential retro-fill solution using 20% C 3 F 7 CN / 80% CO 2 gas mixture for accelerators.
ISSN:1070-9878
1558-4135
DOI:10.1109/TDEI.2021.009376