Effect of O2 on AC Partial Discharge and Decomposition Behavior of C4F7N/CO2/O2 Gas Mixture

Ye, Fanchao; Zhang, Xiaoxing; Li, Yang; Yao, Yuhang; Xiao, Song; Xie, Cheng; Shao, Xianjun; Sun, Xiang

doi:10.1109/tdei.2021.009626

Cited by 14 publications

(10 citation statements)

References 20 publications

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“…Previous research indicates that if the C 4 F 7 N−CO 2 gas mixture is required to meet the minimum operating temperature of −25 °C within the pressure range of 0.1−0.2 MPa, the content of C 4 F 7 N in the mixture should not exceed 18%. 20 In addition, research shows that the generation of most of the decomposition products of the C 4 F 7 N−CO 2 − O 2 gas mixture is the lowest at 4% O 2 after the 96 h PD decomposition test, 21 steel gas chamber is collected every 12 h for composition analysis. Considering that the gas composition in the gas chamber tends to be stable at the end of the test, this paper only analyzes the gas composition of 96 h. Figure 2 shows the gas chromatogram of the 15% C 4 F 7 N−85% CO 2 gas mixture after the 96 h PD test.…”

Section: Experiments Setup and Methodsmentioning

confidence: 99%

“…Previous research indicates that if the C 4 F 7 N–CO 2 gas mixture is required to meet the minimum operating temperature of −25 °C within the pressure range of 0.1–0.2 MPa, the content of C 4 F 7 N in the mixture should not exceed 18%. 20 In addition, research shows that the generation of most of the decomposition products of the C 4 F 7 N–CO 2 –O 2 gas mixture is the lowest at 4% O 2 after the 96 h PD decomposition test, 21 so this paper studies the generation characteristics of the solid decomposition products of the C 4 F 7 N–CO 2 –O 2 gas mixture containing 15% C 4 F 7 N at 0.14 MPa under different O 2 contents (0 and 4%), and the discharge time of each group of tests is 96 h. The gas and solid byproducts of the C 4 F 7 N–CO 2 –O 2 gas mixture at different O 2 contents were analyzed and tested based on GC-MS, SEM, EDS, and XPS, and the gas–solid compatibility of the mixture and metal conductor at different O 2 contents was evaluated based on the relevant results.…”

Section: Experiments Setup and Methodsmentioning

confidence: 99%

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Generation Characteristics of Solid Byproducts of the C₄F₇N–CO₂–O₂ Gas Mixture under PD Fault

Zhuo

Wang

et al. 2023

ACS Omega

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With the gradual improvement of the requirements for the safe and stable operation of gas-insulated equipment (GIE), the eco-friendly insulating gas C 4 F 7 N−CO 2 −O 2 has become the best choice to replace SF 6 and apply it to various medium-voltage (MV) and high-voltage (HV) GIE. At present, the generation characteristics of solid decomposition products of the C 4 F 7 N− CO 2 −O 2 gas mixture under partial discharge (PD) fault need to be studied. In this paper, a 96 h PD decomposition test was carried out by simulating metal protrusion defects in GIE with needle-plate electrodes to study the generation characteristics of C 4 F 7 N−CO 2 − O 2 gas mixture solid decomposition products under PD fault and their compatibility with metal conductors. It was found that obvious ring-shaped solid precipitates appeared in the central area of the surface of the plate electrode under the action of long-term PD, mainly including metal oxides (CuO), silicates (CuSiO 3 ), fluorides (CuF, CF X ), carbon oxides (CO, CO 2 ), and nitrogen oxides (NO, NO 2 ). The addition of 4% O 2 has little effect on the element composition and valence state of PD solid precipitates, but it can reduce their yield to a certain extent. The corrosion effect of O 2 in the gas mixture on metal conductors is weaker than that of C 4 F 7 N.

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Section: Experiments Setup and Methodsmentioning

confidence: 99%

Section: Experiments Setup and Methodsmentioning

confidence: 99%

Generation Characteristics of Solid Byproducts of the C₄F₇N–CO₂–O₂ Gas Mixture under PD Fault

Zhuo

Wang

et al. 2023

ACS Omega

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“…In the case of C 4 F 7 N based GIE, partial discharges CAN result in the generation of gases such as C 3 F 6 , C 2 F 6 , C 3 F 8 , CF 4 , and CO. Notably, the concentration of CF4 demonstrates a strong linear correlation with both the intensity and duration of the discharge . In scenarios of partial overheating, the primary decomposition products of the C 4 F 7 N mixed gas include C 3 F 6 , CO, CF 4 , C 2 F 6 , CF 3 CN, COF 2 , and C 2 N 2 .…”

Section: Introductionmentioning

confidence: 97%

Ag Modified SnS₂ Monolayer as a Potential Sensing Material for C₄F₇N Decompositions: A Density Functional Theory Study

Tan,

Na,

Zhuo

et al. 2024

ACS Omega

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As the field of 2D materials rapidly evolves, substances such as graphene, metal dichalcogenides, MXenes, and MBenes have garnered extensive attention from scholars in the gas sensing domain due to their unique and superior properties. Based on first-principles calculations, this work explored the adsorption characteristics of both intrinsic and silver (Ag) doped tin disulfide (SnS2) toward the decomposition components of the insulating medium C4F7N (namely, CF4, C3F6, and COF2), encompassing the adsorption energy, charge transfer, density of state (DOS), band structure, and adsorption stability. The results indicated that Ag-doped SnS2 exhibited an effective and stable adsorption for C3F6 and COF2, whereas its adsorption for CF4 was comparatively weaker. Additionally, the potential for Ag-SnS2 in detecting C3F6 was highlighted, inferred from the contributions of the band gap variations. This research provides theoretical guidance for the application of Ag-SnS2 as a sensing material in assessing the operational status of gas-insulated equipment.

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“…The GWP of a C 4 F 7 N/CO 2 gas mixture with 4% and 10% C 4 F 7 N is 327 and 690, respectively, which is only 2%-3% that of SF 6 [8]. Besides, the dielectric strength of pure C 4 F 7 N gas is twice that of SF 6 and the insulation performance of C 4 F 7 N/CO 2 with 18%-20% C 4 F 7 N is equivalent to that of SF 6 [9]. Comprehensive performance evaluations of C 4 F 7 N on insulation performance [6][7][8][9], decomposition characteristics [10,11] and material compatibility [12] have been conducted, and have demonstrated that C 4 F 7 N has the application potential for both medium-voltage and high-voltage GIE.…”

Section: Introductionmentioning

confidence: 99%

“…Besides, the dielectric strength of pure C 4 F 7 N gas is twice that of SF 6 and the insulation performance of C 4 F 7 N/CO 2 with 18%-20% C 4 F 7 N is equivalent to that of SF 6 [9]. Comprehensive performance evaluations of C 4 F 7 N on insulation performance [6][7][8][9], decomposition characteristics [10,11] and material compatibility [12] have been conducted, and have demonstrated that C 4 F 7 N has the application potential for both medium-voltage and high-voltage GIE. For example, General Electric successfully developed a 245 kV current transformer and 145 kV gas-insulated switchgear with C 4 F 7 N gas as the insulation medium and put them into trial operation [13].…”

Section: Introductionmentioning

confidence: 99%

Arc decomposition behavior of C ₄ F ₇ N/Air gas mixture and biosafety evaluation of its by‐products

Zhang

et al. 2022

High Voltage

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At present, reports on the arc interruption and decomposition behavior of a C 4 F 7 N/air gas mixture especially the biosafety of its by-products are limited. Herein, a 57% C 4 F 7 N/ 43% air gas mixture was employed as an arc-quenching medium to conduct 200 breaking tests on a load switch (630 A/24 kV). The arc interruption and decomposition behavior of the gas mixture were evaluated, and the biosafety of the decomposition products was assessed based on an acute inhalation toxicity test. It was found that the average arcing time of the 200 breakings was about 10.1 ms and that breakings were basically completed at the zero-crossing of the second or third current half-cycle. The gas mixture after breaking decomposed dramatically (the C 4 F 7 N content decreased by 75.6%), generating a large number of gaseous by-products (CO, CF 4 , C 2 F 6 , C 3 F 8 , CF 3 CN, C 4 F 8 , CO 2 , C 4 F 10 N 2 , C 3 F 6 , C 2 N 2 , etc.) as well as solid by-products (carbon particles). The lethal concentration of 50% (LC50, 4 h) of C 4 F 7 N/air after 200 breakings was 31 ppm (male mice) and 34 ppm (female mice), respectively, and the toxicity was classified as Grade 1. In general, C 4 F 7 N has an arc interruption capability, albeit weaker than that of SF 6 under the same conditions. After breaking, the C 4 F 7 N gas mixture has a relatively high acute inhalation toxicity, and relevant safety protection measures for research or operation personnel are strictly needed.

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Effect of O₂ on AC Partial Discharge and Decomposition Behavior of C₄F₇N/CO₂/O₂ Gas Mixture

Cited by 14 publications

References 20 publications

Generation Characteristics of Solid Byproducts of the C₄F₇N–CO₂–O₂ Gas Mixture under PD Fault

Generation Characteristics of Solid Byproducts of the C₄F₇N–CO₂–O₂ Gas Mixture under PD Fault

Ag Modified SnS₂ Monolayer as a Potential Sensing Material for C₄F₇N Decompositions: A Density Functional Theory Study

Arc decomposition behavior of C ₄ F ₇ N/Air gas mixture and biosafety evaluation of its by‐products

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Effect of O2 on AC Partial Discharge and Decomposition Behavior of C4F7N/CO2/O2 Gas Mixture

Cited by 14 publications

References 20 publications

Generation Characteristics of Solid Byproducts of the C4F7N–CO2–O2 Gas Mixture under PD Fault

Generation Characteristics of Solid Byproducts of the C4F7N–CO2–O2 Gas Mixture under PD Fault

Ag Modified SnS2 Monolayer as a Potential Sensing Material for C4F7N Decompositions: A Density Functional Theory Study

Arc decomposition behavior of C 4 F 7 N/Air gas mixture and biosafety evaluation of its by‐products

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Effect of O₂ on AC Partial Discharge and Decomposition Behavior of C₄F₇N/CO₂/O₂ Gas Mixture

Generation Characteristics of Solid Byproducts of the C₄F₇N–CO₂–O₂ Gas Mixture under PD Fault

Generation Characteristics of Solid Byproducts of the C₄F₇N–CO₂–O₂ Gas Mixture under PD Fault

Ag Modified SnS₂ Monolayer as a Potential Sensing Material for C₄F₇N Decompositions: A Density Functional Theory Study

Arc decomposition behavior of C ₄ F ₇ N/Air gas mixture and biosafety evaluation of its by‐products