A5054794668- High voltage insulation and dielectric phenomena
- Plasma Diagnostics and Applications
- Plasma Applications and Diagnostics
- Power Transformer Diagnostics and Insulation
- Mass Spectrometry Techniques and Applications
- Atomic and Molecular Physics
- Thermal Analysis in Power Transmission
- Maritime Transport Emissions and Efficiency
- Heat transfer and supercritical fluids
- Biodiesel Production and Applications
- Acupuncture Treatment Research Studies
- Aerogels and thermal insulation
- Water Quality Monitoring and Analysis
- Spectroscopy and Laser Applications
- Advanced Chemical Sensor Technologies
- Prenatal Screening and Diagnostics
- Architecture and Computational Design
- Ion-surface interactions and analysis
- Inorganic Fluorides and Related Compounds
- Healthcare and Venom Research
- Earthquake Detection and Analysis
- Ionosphere and magnetosphere dynamics
- Gas Sensing Nanomaterials and Sensors
- Refrigeration and Air Conditioning Technologies
- Advanced Combustion Engine Technologies
China Southern Power Grid (China)
2024
Xi'an Jiaotong University
2011-2024
Central South University
2015
Abstract The perfluoronitrile C 4 F 7 N is considered a promising SF 6 -alternative in high-voltage gas-insulated apparatus, thanks to its high dielectric strength and low global warming potential. However, complete consistent set of electron-neutral collision cross-sections still lacking, which hinders relevant plasma modeling. In this contribution, the available are first compiled assessed. initial adjusted iteratively by electron swarm method determine self-consistent cross-section for...
C4F7N and C5F10O are the most promising SF6 alternatives as eco-friendly insulating gaseous mediums in electrical engineering. It is necessary to clarify their stability decomposition mechanisms. In this work, we first introduced our experimental results for products of C4F7N/CO2 C5F10O/synthetic air mixtures under partial discharge spark conditions. Then, performed ab initio molecular dynamics (AIMD) simulations on typical products. The were standard electron impact mass spectrometry...
Recently, C4F7N mixtures have attracted attention as a promising SF6 alternative due to their low global warming potential and excellent electrical performance. In this study, we introduce newly built experimental setup for pulsed Townsend measurements well the physical model acquisition of electron swarm parameters. The effective ionization rate coefficients, drift velocity, density-normalized longitudinal diffusion coefficients in its with CO2 N2 were obtained. reduced critical electric...
Abstract In this work, a convenient and efficient method is proposed to determine swarm parameters considering ion kinetics from pulsed Townsend (PT) measurements. First, physical model was presented describe the development of PT discharge electron detachment conversion reactions. A numerical solution also proposed. order assess precision our calculations, we calculated electronic ionic transients derived for different cases. Then, genetic algorithm (GA) find set parameters, under which...
Abstract Perfluoroketone C 5 F 10 O is considered as a potential SF 6 alternative. The global warming of extremely low and even close to that air. We investigated the electrical insulation properties by pulsed Townsend experiment. rate coefficients ionization, attachment, effective well electron drift velocity longitudinal diffusion coefficient in pure were obtained. conclude density-reduced critical electric field (768 ± 5)Td ion kinetics are not exist or negligible O. Furthermore, swarm...
The gas mixture CO2–O2 has been considered as an insulation and arc-quenching medium in gas-insulated switchgears. In this paper, the dielectric breakdown properties of mixtures at different O2 concentrations pressures were studied theoretically by considering ion kinetics a spatial–temporal growth avalanche model. A kinetic scheme that includes all main reactions likely to occur is presented. An improved method calculate strength developed, based on model considers both spatial temporal...
ABSTRACT. With the energy sector having a greater carbon impact than every other industry combined, urgent need for decarbonization to combat climate change cannot be overstated. Sulfur hexafluoride (SF6), as arc extinguishing and insulating medium, is broadly applied in power equipment. While it very essential find an environmentally friendly substitute gas SF6 due its strong greenhouse effect. Efforts are underway bring Zero closer. Although there many potential alternatives, most have...
Abstract Sulfur hexafluoride (SF 6 ), as an arc extinguishing and insulating medium, is broadly applied in power equipment; however, it essential to find environmentally friendly substitute gas for SF due its strong greenhouse effect. Although there are many potential alternatives, most have relatively high boiling points that cannot meet the minimum operating temperature of equipment. In past, liquefaction mixture was reduced by mixing with buffer gases, such CO 2 , N or dry air. However,...
Dimethyl ether (DME) is a promising alternative fuel, which can be used as substitute for fossil diesel fuels, with smaller lower heating value. When in engines, the nozzle flow area (i.e. number of holes × hole diameter) engine normally increased to maintain power. In this study, three kinds (with areas 5 0.30 mm, 0.35 and 0.40 mm respectively) were prepared. With two-cylinder engine, effects on DME injection process combustion characteristics investigated. The experimental results indicate...
Some new fluorinated gases such as C4F7N and C5F10O are potential SF6 alternative but the fundamental properties including cross sections data still very limitted. The electron attachment process is extremely important in kenetic of electronegative gases. We introduced a method for obtaining by analysis swarm parameters. For this purpose, investigated gas was added small proportion to different carrier effective ionization rate constants were measured, with pulsed Townsend experiment. Based...
Recently, perfluoroketone C5F10O has been regarded as a promising alternative gas for SF6, of which the global warming potential (GWP) is extremely high. good insulation property and GWP value only 1, thus can be used medium in gas-insulated switchgears. In this study, decomposition products under partial discharges are detected qualitatively analysed by chromatography-mass spectrometry (GC-MS). The stable like C2F6, C3F6, C3F8, C4F10 CF2O formed. Meanwhile, to theoretically obtain phase...
SF6 gas is widely used in electric power apparatus as an insulation and arc-quenching medium. However, has a high greenhouse effect. There are many investigations focusing on searching for environmentally friendly gases which can achieve equivalent strength with SF6, meanwhile, reduce global warming potential (GWP) apparently. C4H2F6 novel, chemically stable, non-toxic non-flammable low GWP of 18, zero Ozone Depletion Potential (ODP), boiling point 7.5℃ critical temperature 137.7℃. In this...