Breakdown Characteristics of C<sub>4</sub>F<sub>7</sub>N/CO<sub>2</sub>/O<sub>2</sub> Gas Mixtures with Low Content of C<sub>4</sub>F<sub>7</sub>N
Perfluoroisobutyronitrile (C<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</inf>F<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</inf>N) gas mixture is a promising SF<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">6</inf> alternative characterized by its low global warming potential (GWP), high insulation strength, and short atmospheric lifetime. Considering the persistent environmental pollution and bioaccumulation risks associated with per- and polyfluoroalkyl substances (PFAS), regulatory measures have been implemented across regions to control PFAS and F-gases. Therefore, investigating the insulating performance of C<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</inf>F<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</inf>N gas mixtures with low concentration is essential. In this study, the influence of oxygen content and gas pressure on the insulation performance of C<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</inf>F<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</inf>N/CO<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>/O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> gas mixtures with low content of C<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</inf>F<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</inf>N were investigated. The results show that, compared with C<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">4</inf>F<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">7</inf>N mixture without O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>, increasing oxygen content at 0.1 MPa reduced the insulating strength of the gas mixture, with the smallest reduction of 0.33% observed at an O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> concent of 4%. At 0.2 MPa, adding 4%–8% oxygen decreased the insulation strength, while an O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf> content of 12% enhances it by 7.36%. At pressures between 0.3 and 0.4 MPa, higher oxygen concentrations were found to enhance the insulation performance., with the maximum increases of 9.35% and 8.20% occurring at 8% O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>(0.3 MPa) and 12% O<inf xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</inf>(0.4 MPa), respectively.
Authors
- Tianxin Zhuang (ORCID: https://orcid.org/0000-0003-3275-2664)
- X. L. Lu
- Jing Yan (ORCID: https://orcid.org/0000-0002-8456-2056)
- Pu Chen (ORCID: https://orcid.org/0000-0001-7412-6501)
- Yuxin Lin (ORCID: https://orcid.org/0000-0002-4509-7657)
- Hanyan Xiao (ORCID: https://orcid.org/0000-0003-1522-8836)
Institutions
- Electric Power Research Institute (US)
- Shanghai Electric (China) (CN)
- State Key Laboratory of Electrical Insulation and Power Equipment
- Xi'an Jiaotong University (CN)
Publication Details
- Published
- 2025-05-23
- DOI
- https://doi.org/10.1109/ieecsc64206.2025.11099686
- Primary Topic
- High voltage insulation and dielectric phenomena
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Key Research and Development Program of China