This study explores the effect of O 2 as the second-component buffer gas on the power frequency breakdown characteristics and decomposition products of C5-PFK/CO 2 gas mixture. It is found that the breakdown voltage of C5-PFK/CO 2 gas mixture containing 7.5% C5-PFK is about 1.4 times that of CO 2 gas and about 2/3 of SF 6 gas at the same pressure. Although the average breakdown voltage of C5-PFK/CO 2 /O 2 gas mixture is slightly lowered, the addition of O 2 reduces the standard deviation of the breakdown voltage, improving the insulation stability of the C5-PFK/CO 2 gas mixture. The decomposition by products of C5-PFK/CO 2 gas mixture include CO, CO 2 , CF 4 , COF 2 , C 2 F 4 , C 2 F 6 , C 3 F 6 , C 3 F 6 0, C 3 F 8/ , C 4 F 10 , CHF 3 , C3HF7 and other fluorocarbon compounds. C5-PFK/CO 2 /O 2 gas mixture with 4% O 2 produces much CF 4 , C 2 F 6 and less CO after breakdown. It is recommended to add 4 to 6% O 2 in C5-PFK/CO 2 gas mixture to improve the power frequency breakdown characteristics for engineering application.

中文翻译：

---

氧气对C5-PFK/CO2混合气体工频击穿特性及分解性能的影响


本研究探讨了O 2 作为第二组分缓冲气体对C5-PFK/CO 2 气体混合物工频击穿特性和分解产物的影响。结果发现，在相同压力下，含有7.5％C5-PFK的C5-PFK/CO 2 气体混合物的击穿电压约为CO 2 气体的1.4倍，约为SF 6 气体的2/3。虽然C5-PFK/CO 2 /O 2 气体混合物的平均击穿电压略有降低，但O 2 的添加降低了击穿电压的标准偏差，提高了C5-PFK/CO 2 气体混合物的绝缘稳定性。 C5-PFK/CO 2 气体混合物的分解副产物包括CO、CO 2 、CF 4 、COF 2 、C 2 F 4 、C 2 F 6 、C 3 F 6 、C 3 F 6 0、C 3 F 8 / 、C 4 F 10 、CHF 3 、C3HF7 等氟碳化合物。 C5-PFK/CO 2 /O 2 气体混合物与4％O 2 分解后产生大量CF 4 、C 2 F 6 和少量CO。建议在C5-PFK/CO 2 混合气体中添加4～6%的O 2 ，​​以改善工频击穿特性，适合工程应用。