摘要详情

ID / 提交时间

132 / 2024-04-14 16:20:49

标题

Study of Breakdown Strength of Supercritical Carbon Dioxide

关键字

Supercritical fluid,Carbon dioxide,voltage dispersion,Breakdown Strength

主题及专题

1)Emerging HV Switching Technologies

状态

终稿

作者

Wenbo Kong / State Key Laboratory of Electrical Insulation and Power Equipemnt, Xi’an Jiaotong University

Jiashu Han / State Key Laboratory of Electrical Insulation and Power Equipemnt, Xi’an Jiaotong University

Yuzhan Ding / State Key Laboratory of Electrical Insulation and Power Equipemnt, Xi’an Jiaotong University

Liqiong Sun / State Key Laboratory of Electrical Insulation and Power Equipemnt, Xi’an Jiaotong University

Yingsan Geng / State Key Laboratory of Electrical Insulation and Power Equipemnt, Xi’an Jiaotong University

Jianhua Wang / State Key Laboratory of Electrical Insulation and Power Equipemnt, Xi’an Jiaotong University

Zhenxing Wang / State Key Laboratory of Electrical Insulation and Power Equipemnt, Xi’an Jiaotong University

摘要

Supercritical carbon dioxide (scCO₂) has garnered significant attention due to its excellent insulating strength and transport properties. Current international research primarily focuses on its breakdown characteristics near the critical point in micron-scale gaps. However, variations in power source types and polarities result in breakdown voltage data that lack broad reference significance, and there is a lack of discussion on voltage dispersion. For the same gap distance, slightly non-uniform electric fields exhibit similar DC, power frequency breakdown voltages (amplitudes), and 50% impulse breakdown voltages, with no significant polarity effect in asymmetric electrodes, indicating these data are valuable references. In this study, an independent supercritical discharge system was established using sphere-to-plate electrodes to generate a slightly non-uniform electric field with a non-uniformity coefficient of 0.99. Breakdown experiments were conducted at a 0.3 mm gap. The breakdown strength of scCO₂ was compared with common insulating media, and the regularity of its breakdown voltage dispersion was discussed. The results provide experimental data and a theoretical foundation for the application of scCO₂ in switching technology.