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C4F7N/CO2is one of the most promising alternatives to SF6in high-voltage electrical equipment such as gas insulated switchgear (GIS) because of its excellent electrical performance and low environmental impact. However, the insulation characteristics of C4F7N/CO2is still unclear regarding the effect of conductor surface roughness. To obtain a figure of merit of C4F7N/CO2gas mixtures and to evaluate its sensitivity to local inhomogeneous electric field, the breakdown voltage of electronegative gas considering surface roughness is developed using the streamer discharge theory. A gas discharge experimental platform for C4F7N/CO2mixed gas is set up and the discharge test is carried out under gas pressures from 0.15∼0.5 MPa having a maximum protrusion height of 15 μm. The results demonstrate that when the volume fraction of C4F7N is 10%, the figure of merit of C4F7N/CO2mixture is slightly higher than that of SF6gas. Therefore, at the same pressure, the standard of conductor surface roughness for C4F7N/CO2equipment can refer to the original SF6gas equipment.
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Zheng et al. (2019) studied this question.
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