Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 54, Issue 5, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6463/abbc97
Keywords
C4F7N; CO2; eco-friendly gas insulating medium; electric field sensitivity; discharge
Categories
Funding
- Natural Science Foundation of China [51707137, 51977159]
- Young Elite Scientists Sponsorship Program by CAST
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This study investigated the insulation performance of C4F7N/CO2 gas mixture under different gas pressures and mixing ratios. It was found that the gas mixture is more sensitive to electric fields compared to SF6 and CO2, making it prone to partial discharge under non-uniform electric fields. Optimization of internal equipment structure is necessary to enhance insulation performance.
C4F7N has excellent insulation performance. By mixing with CO2, it is the highest potential alternative gas to the most greenhouse effect gas insulating medium SF6, which is widely used in gas insulated high voltage electrical equipment. It is necessary to explore its insulation stability under different electrical fields before application. In this paper, the influence of electric field on C4F7N/CO2 mixture with different gas pressures and mixing ratios is tested, analyzed and compared with SF6 by experiment and calculation. It was found that the electric field sensitivity of C4F7N/CO2 gas mixture is much higher than that of SF6 and CO2, where it is easy for partial discharge to emerge under non-uniform electric field. The insulation performance of C4F7N/CO2 gas mixture is extremely susceptible to the internal electric field of electrical equipment, and optimization of the equipment internal structure to avoid uneven electric fields is needed.
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