AC Breakdown Characteristics of CF3I-N2Gas Mixtures in Condition of Quasi-homogeneous and Extremely Non-uniform Electric Field

作者：Deng, Yunkun^*; Ma, Yi; Chen, Xianfu; Zhang, Shaoquan; Chen, Xiaoyun; Xiao, Dengming

来源：High Voltage Engineering, 2017, 43(3): 754-764.

DOI：10.13336/j.1003-6520.hve.20170303009

• AC breakdowns
• Breakdown characteristics
• Homogeneous electric field
• Homogeneous field
• Nonuniform electric field
• Power frequency withstand voltages
• Replacement gas for SF6
• Trifluoroiodomethane

Trifluoroiodomethane (CF3I) has been broadly proposed as a potential replacement for SF6. AC breakdown tests on CF3I-N2gas mixtures have been completed in the condition of quasi-homogeneous and extremely non-uniform electric field, focusing on the CF3I-N2gas mixtures with volume fraction of 20% and 30% CF3I, gas pressure from 0.1 MPa to 0.3 MPa, and gap distance from 5 mm to 30 mm. On the basis of the foregoing analyses of breakdown characteristics, we reveal the effect laws of CF3I volume fraction, gap distance, gas pressure, and electric field non-uniform coefficient on the power frequency breakdown voltage of CF3I gas mixtures. The AC breakdown voltages of CF3I-N2gas mixtures linearly increase with the gas pressure and gap distance under quasi-homogeneous field. In the condition of non-uniform field, the AC breakdown voltages of CF3I-N2gas mixtures approach to saturation with the increasing of gas pressure. The experimental results indicate that CF3I-N2gas mixtures with CF3I volume fraction of 20% and 30% can achieve nearly 50% and 55% power frequency withstand voltage of pure SF6, respectively.

• 出版日期2017
• 单位上海交通大学