Abstract
This paper investigates the effect of O2 on the partial discharge (PD) and decomposition characteristics of C5F10O/CO2/O2 gas mixture employed as an eco-friendly gas insulating medium. We found that the insulation performance of the C5F10O/CO2/O2 gas mixture is less degraded as the content of O2 is less than 4%. However, PDIV+ is significantly reduced, and the discharge repetition rate increases drastically when the O2 content exceeds 4%. The PD decomposition products of C5F10O/CO2/O2 mainly include CF4, C2F6, C3F8, C3F6, CF2O, C2F6O3, and C3F7H. The addition of 2% O2 has a strong inhibitory effect on the generation of CF4, C2F6, C3F6, C3F8, CF2O, and C2F6O3. This work provides guidance for the application of the C5F10O/CO2/O2 gas mixture.
Highlights
IntroductionSulfur hexafluoride (SF6) is widely used in gas-insulated equipment (GIE) due to its excellent insulation and arc-quenching properties. its global warming potential (GWP) is ∼23 500 times that of CO2 and is listed in the Kyoto Protocol as a greenhouse gas. Its atmosphere content is increasing yearly, and the power industry accounts for over 80% of its annual production. it has become an urgent issue to search for an eco-friendly gas with strong insulation capacity, safety, and reliability to reduce the use of SF6.C5F10O (perfluoropentanone) is considered a high potential eco-friendly gas insulating medium with a dielectric strength of 1.4 times that of SF6, an atmospheric lifetime of 15 days, and a low GWP value of 1.4 As the boiling point of C5F10O is 26.9 ○C, it needs to be mixed with a buffer gas with lower liquefaction temperatures, such as CO2, N2, or dry air, in order to meet the minimum liquefaction temperature requirement for engineering applications. At present, sufficient research on the insulation, arc extinguishing, decomposition properties, material compatibility, adsorption, and other properties of the C5F10O gas mixture has been conducted, which confirms its potential to replace SF6 in low and medium voltage equipment. Chachereau et al measured the swarm parameters and (E/N)crit of the C5F10O gas mixture and found that the densityreduced critical electric field of C5F10O is about 2.1 times larger than that of SF6.12 Guo et al measured the 50% breakdown voltage of C5F10O mixtures under lightning impulse voltage and found that the breakdown voltage of C5F10O mixtures with 28% C5F10O content was higher than that of SF6.13 Li et al pointed out that the decomposition of the C5F10O/air gas mixture mainly includes CF4, C2F6, C3F8, C3F6, C4F10, and CF2O, and the AC breakdown voltage of the C5F10O/air gas mixture decreased slightly after repeated breakdown tests. Zhang et al found that C5F10O exhibited good thermal stability at 300 ○C but began to decompose at 500 ○C, producing CO, CO2, C2F6, C2F4, C3F8, C3F6, C4F10, C4F8, and CHF3.15 They indicated that CF4, C3F6, CF2O, CHF3, and C3HF7 had good compatibility with Al (1 1 1) and Cu (1 1 1) surfaces, while
Chachereau et al measured the swarm parameters and (E/N)crit of the C5F10O gas mixture and found that the densityreduced critical electric field of C5F10O is about 2.1 times larger than that of SF6.12 Guo et al measured the 50% breakdown voltage of C5F10O mixtures under lightning impulse voltage and found that the breakdown voltage of C5F10O mixtures with 28% C5F10O content was higher than that of SF6.13 Li et al pointed out that the decomposition of the C5F10O/air gas mixture mainly includes CF4, C2F6, C3F8, C3F6, C4F10, and CF2O, and the AC breakdown voltage of the C5F10O/air gas mixture decreased slightly after repeated breakdown tests
Zhang et al found that C5F10O exhibited good thermal stability at 300 ○C but began to decompose at 500 ○C, producing CO, CO2, C2F6, C2F4, C3F8, C3F6, C4F10, C4F8, and CHF3.15 They indicated that CF4, C3F6, CF2O, CHF3, and C3HF7 had good compatibility with Al (1 1 1) and Cu (1 1 1) surfaces, while
Summary
Sulfur hexafluoride (SF6) is widely used in gas-insulated equipment (GIE) due to its excellent insulation and arc-quenching properties. its global warming potential (GWP) is ∼23 500 times that of CO2 and is listed in the Kyoto Protocol as a greenhouse gas. Its atmosphere content is increasing yearly, and the power industry accounts for over 80% of its annual production. it has become an urgent issue to search for an eco-friendly gas with strong insulation capacity, safety, and reliability to reduce the use of SF6.C5F10O (perfluoropentanone) is considered a high potential eco-friendly gas insulating medium with a dielectric strength of 1.4 times that of SF6, an atmospheric lifetime of 15 days, and a low GWP value of 1.4 As the boiling point of C5F10O is 26.9 ○C, it needs to be mixed with a buffer gas with lower liquefaction temperatures, such as CO2, N2, or dry air, in order to meet the minimum liquefaction temperature requirement for engineering applications. At present, sufficient research on the insulation, arc extinguishing, decomposition properties, material compatibility, adsorption, and other properties of the C5F10O gas mixture has been conducted, which confirms its potential to replace SF6 in low and medium voltage equipment. Chachereau et al measured the swarm parameters and (E/N)crit of the C5F10O gas mixture and found that the densityreduced critical electric field of C5F10O is about 2.1 times larger than that of SF6.12 Guo et al measured the 50% breakdown voltage of C5F10O mixtures under lightning impulse voltage and found that the breakdown voltage of C5F10O mixtures with 28% C5F10O content was higher than that of SF6.13 Li et al pointed out that the decomposition of the C5F10O/air gas mixture mainly includes CF4, C2F6, C3F8, C3F6, C4F10, and CF2O, and the AC breakdown voltage of the C5F10O/air gas mixture decreased slightly after repeated breakdown tests. Zhang et al found that C5F10O exhibited good thermal stability at 300 ○C but began to decompose at 500 ○C, producing CO, CO2, C2F6, C2F4, C3F8, C3F6, C4F10, C4F8, and CHF3.15 They indicated that CF4, C3F6, CF2O, CHF3, and C3HF7 had good compatibility with Al (1 1 1) and Cu (1 1 1) surfaces, while. C5F10O (perfluoropentanone) is considered a high potential eco-friendly gas insulating medium with a dielectric strength of 1.4 times that of SF6, an atmospheric lifetime of 15 days, and a low GWP value of 1.4 As the boiling point of C5F10O is 26.9 ○C, it needs to be mixed with a buffer gas with lower liquefaction temperatures, such as CO2, N2, or dry air, in order to meet the minimum liquefaction temperature requirement for engineering applications.. Sufficient research on the insulation, arc extinguishing, decomposition properties, material compatibility, adsorption, and other properties of the C5F10O gas mixture has been conducted, which confirms its potential to replace SF6 in low and medium voltage equipment..
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