Theoretical and experimental investigation on decomposition mechanism of eco-friendly insulation gas HFO1234zeE

Wang, Jian; Li, Qingmin; Liu, Heng; Huang, Xuwei

doi:10.1016/j.jmgm.2020.107671

Cited by 19 publications

(15 citation statements)

References 32 publications

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“…Taking into full consideration of the free radical content in the system and the energy change of the reaction path, it can be inferred that C 2 F 4 , C 2 F 6 , CO 2 , C 2 F 2 H 2 , CF 3 CCH, and CF 3 CCF are the main products generated in the diffusion cooling process. This result is basically consistent with the HFO decomposition products obtained by gas chromatography in the previous work of our research team . However, it does not reflect the formation of cis -C 3 H 2 F 4 (the isomer of HFO1234Ze(E)), C 2 HF 3 , and CF 3 CHCF 2 .…”

Section: Resultssupporting

confidence: 91%

“…In addition to the solid decomposition products, the presence of O 2 will also affect the generation mechanism of other gas decomposition products such as CF 4 and CHF 3 , which may have an important impact on the long-term insulation performance of the system. 22 Therefore, it is necessary to analyze the decomposition characteristics of the HFO mixture under the influence of different O 2 contents.…”

Section: Resultsmentioning

confidence: 99%

“…This result is basically consistent with the HFO decomposition products obtained by gas chromatography in the previous work of our research team. 22 However, it does not reflect the formation of cis -C 3 H 2 F 4 (the isomer of HFO1234Ze(E)), C 2 HF 3 , and CF 3 CHCF 2 .…”

Section: Resultsmentioning

confidence: 99%

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Inhibition Effect of Solid Products and DC Breakdown Characteristics of the HFO1234Ze(E)–N₂–O₂ Ternary Gas Mixture

Liu

Wang

et al. 2021

ACS Omega

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HFO1234ze(E) is an environmentally friendly SF 6 substitute gas with prominent application potential. To suppress the generation of the HFO1234ze(E) solid decomposition products, which may cause great hazards to the gas–solid insulation strength, a gas mixing scheme screening method based on the reactive force field (ReaxFF) molecular dynamics (MD) simulation was innovatively proposed. The simulation results show that the inhibitory effect of O 2 on the formation of HFO1234ze(E) solid products is better than those of CO 2 and CF 4 . Further study shows that when O 2 accounts for 3.33% of the gas mixture, the solid precipitate content is reduced by 48%. The experimental study shows that an O 2 content of 3.33% can inhibit the generation of solid products by more than 50%. Besides, compared with HFO1234ze(E)-N 2 , the DC breakdown voltage of HFO1234ze(E)-N 2 -O 2 is slightly increased, and the breakdown voltage dispersion degree and continuous breakdown voltage drop rate are decreased. This work gives a feasible solution for the suppression of HFO1234ze(E) solid decomposition products and provides an efficient method for solving similar problems of environmentally friendly insulating gas in C/F/O/N systems.

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Section: Resultssupporting

confidence: 91%

Section: Resultsmentioning

confidence: 99%

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Inhibition Effect of Solid Products and DC Breakdown Characteristics of the HFO1234Ze(E)–N₂–O₂ Ternary Gas Mixture

Liu

Wang

et al. 2021

ACS Omega

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“…Although it is well-accepted that HFO-1234ze is stable enough for electric use [29,30], neither experimental nor theoretical thermodynamic parameters are available yet. Using Gaussian-4 theory [31], the gaseous enthalpies of formation at 298.15 K (ΔH 0 f,298 ) for E-and Z-HFO-1234ze were estimated to be À798.2 and À788.5 kJ/mol, respectively, as indicative of their good thermal stability.…”

Section: Resultsmentioning

confidence: 99%

Stereo‐dependent dimerization, boiling points, diffusion coefficients, and dielectric constants of E/Z‐HFO‐1234ze

Hou

et al. 2021

Int J of Quantum Chemistry

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Stereo-dependent properties of E-and Z-HFO-1234ze were investigated by density functional theory, extrapolated complete basis set limit, explicitly correlation, and symmetry-adapted perturbation theory together with molecular dynamics simulations. The enthalpy of isomerization of E-HFO-1234ze to the Z isomer is 9.7 kJ/mol, showing the reverse cis effect. The HFO-1234ze molecules interact predominantly via π-π stacking of the double bonds and hydrogen bonding of CHÁ Á ÁF. Although the E-dimers involve less steric exchange-repulsion, their binding energies are generally smaller by 2-6 kJ/mol than the Z-dimers, in which the Coulombic multipole-multipole-type electrostatic interactions and the long-range dispersions are more profound. Local ordering in liquid occurs primarily via π stacking of the CHF-end. The significant difference in boiling points of E-and Z-HFO-1234ze is clarified in terms of the dimerization free energy. Self-diffusion coefficients and dielectric constants of HFO-1234ze depend strongly on the E-and Z-conformations.

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“…Among the three gases involved in the experiment, the 20% SF6/80% N2 gas mixture has been used in the actual engineering of GIL equipment [16]. In addition, many studies have pointed out that the insulation performance of 4% C3F7CN/96%CO2 gas mixture is very good, so it has huge application potential [17]. During the experiment, SF6 (or C3F7CN) was first filled, and then N2 (or CO2) was filled, until the pressure of pure gas or mixed gas reached 0.1MPa.…”

Section: B Test Methodsmentioning

confidence: 99%

Mechanism Analysis of Particle-Triggered Flashover in Different Gas Dielectrics Under DC Superposition Lightning Impulse Voltage

Wang

Chang

et al. 2020

IEEE Access

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When DC GIL in operation endures the lightning impulse voltage, the charge accumulation at the gas-solid interface area will seriously affect the insulation performance of the spacer. Considering that gas side conduction is one of the important factors affecting charge accumulation, for the purpose of clarifying of the insulation characteristics of gaseous medium in the flashover process of gas-solid interface, an experimental platform for simulating the working conditions of the spacer is built. The spacer flashover tests were carried out with and without aluminum particle in SF6, 4% C3F7CN /96% CO2 and 20% SF6/80% N2 gas mixture. The measurement and analysis of surface potential distribution behavior of the spacer was conducted. The experiment results show that the gas dielectric is not the factor which dominate the potential distribution process without aluminum particle, and there is little difference in potential distribution with various gaseous conditions. When the linear aluminum particle appears on the surface of the insulator, it will cause severe electric potential distortion and these potential distorted areas are located around the end of the metal particle near the central conductor, and along with flashover pathway. It has also demonstrated that the gaseous dielectric has influence on the surface charge accumulation behavior especially with metallic particle adhere to spacer surface. Under the C3F7CN/CO2 gas mixture, the surface flashover voltage decrease percentage is about 16.82% and may be lower. Besides, the insulation strength of the gaseous dielectric itself is also a key factor affecting flashover.

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Theoretical and experimental investigation on decomposition mechanism of eco-friendly insulation gas HFO1234zeE

Cited by 19 publications

References 32 publications

Inhibition Effect of Solid Products and DC Breakdown Characteristics of the HFO1234Ze(E)–N₂–O₂ Ternary Gas Mixture

Inhibition Effect of Solid Products and DC Breakdown Characteristics of the HFO1234Ze(E)–N₂–O₂ Ternary Gas Mixture

Stereo‐dependent dimerization, boiling points, diffusion coefficients, and dielectric constants of E/Z‐HFO‐1234ze

Mechanism Analysis of Particle-Triggered Flashover in Different Gas Dielectrics Under DC Superposition Lightning Impulse Voltage

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Theoretical and experimental investigation on decomposition mechanism of eco-friendly insulation gas HFO1234zeE

Cited by 19 publications

References 32 publications

Inhibition Effect of Solid Products and DC Breakdown Characteristics of the HFO1234Ze(E)–N2–O2 Ternary Gas Mixture

Inhibition Effect of Solid Products and DC Breakdown Characteristics of the HFO1234Ze(E)–N2–O2 Ternary Gas Mixture

Stereo‐dependent dimerization, boiling points, diffusion coefficients, and dielectric constants of E/Z‐HFO‐1234ze

Mechanism Analysis of Particle-Triggered Flashover in Different Gas Dielectrics Under DC Superposition Lightning Impulse Voltage

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Inhibition Effect of Solid Products and DC Breakdown Characteristics of the HFO1234Ze(E)–N₂–O₂ Ternary Gas Mixture

Inhibition Effect of Solid Products and DC Breakdown Characteristics of the HFO1234Ze(E)–N₂–O₂ Ternary Gas Mixture