Abstract
As an environmental friendly insulating medium, C 4 F 7 N has received extensive attention in the past two years. In this study, the partial discharge (PD) and breakdown characteristics of C 4 F 7 N/CO 2 gas mixture were investigated using the gas insulation performance test platform. The influence of gas pressure and mixing ratio on the PD initial voltage (PDIV) and breakdown voltage of C 4 F 7 N/CO 2 gas mixture in different electric fields was tested. It was found that the PDIV and breakdown voltage of gas mixture with 2–8% C 4 F 7 N in the highly non-uniform field showed a linear saturation increasing trend with the change of gas pressure and mixing ratio. The breakdown voltage of gas mixture increases linearly with gas pressure in the quasi-uniform electric field. The relative breakdown voltage of gas mixture in the highly non-uniform field under high-pressure conditions is inferior to those of low-pressure conditions. The C 4 F 7 N/CO 2 gas mixture containing 2–8% C 4 F 7 N is sensitive to the non-uniformity of electric field. According to the PD and breakdown tests results, C 4 F 7 N/CO 2 gas mixture with 2–8% C 4 F 7 N has the potential to replace SF 6 using in gas-insulated equipment.
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