News Center
used SF6 N2 Mixtures Analysis

used SF6 N2 Mixtures Analysis

Jan 01, 2013 · The use of optical multichannel analysis is described to quantify the establishment of corona in a positive point/plane electrode gap for 50/50 SF 6 /N 2 gas mixtures. The system permits spatial and temporal resolution of the emitted light and, in conjunction with other measurements, provides evidence on the mechanism of corona stabilization for a range of pressures and step voltages up to breakdown.

[email protected]
News Detail
  • Pure SF6 and SF6-N2 mixture gas hydrates equilibrium and

    The equilibrium pressure of SF6-N2 mixture gas was higher than that of pure SF6 gas. Phase equilibrium data of SF6-N2 mixture gas was similar to SF6 rather than N2. The kinetics of SF6-N2 mixture gas was controlled by the amount of SF6 at the initial gas composition as well as N2 gas incorporation into the S-cage of structure-II hydrate preformed by the SF6 gas.

    Get Price
  • Analysis of Experimental and Simulation Results of SF6/N2 Gas

    To analyze the breakdown voltages of SF6 N2 gases and their mixtures this research work is focused on experimental and simulation investigation of DC breakdown voltages at different pressure on positive polarity. COMSOL MULTI-PHYSICS used to get simulation results at different pressures and SF6/N2 gas mixture.

    Get Price
  • Separation of SF6 from SF6/N2 mixture using metal–organic

    Feb 15, 2015 · The Langmuir and Dual-site Langmuir–Freundlich models were used to fit the experimental data, and the results of the isotherm experiments were used to calculate the selectivity of SF 6 and N 2 based on the Ideal Adsorbed Solution Theory (IAST). Furthermore, the isosteric heat of adsorption was also calculated using the Clausius–Clapeyron equation, since the isosteric heat of adsorption is an important parameter for determining the degree of temperature changes of the adsorption bed

    Get Price
  • Inception corona discharge voltages in SF6-N2 gas mixtures at

    without prior purification. The SF6 used in these experiments is delivered with a purity of 99.97%. The measurements were made for pressures ranging from 3 bars to 15 bars. A partial pressure method is used to mix the gases in the cell. SF6 was first introduced followed by nitrogen. It is supposed that SF6 and N2 do mix quite well. The current was measured when the

    Get Price
  • (PDF) Insulation properties of SF6/N2 gas mixtures under high

    The apparatus was used to study the volumetric behavior of methane and four mixtures of hydrogen and methane from +50° to −200°F. and pressures as high as 7,000 lb./sq. in.The experimental

    Get Price
  • (PDF) Calculation of partial discharge inception voltages in

    In recent years, there has been a renewed fields in ultradilute SF6+N2 gas mixtures. The analysis is applied for interest in SF6+N2 mixtures for possible practical rod-plane gaps. Since the average errors are less than 5%, it is applications in order to reduce the usage of SF6 [9].

    Get Price
  • (PDF) Comparative Analysis of Discharge Sensitivity by the

    The discharge fractal dimension D of 50%/50% SF6/N2 gas mixture equals to 1.2192, and the average velocity during the discharge process of streamer propagation is 1.15 Mm/s.

    Get Price
  • Dielectric properties of gas mixtures with C3F8/C2F6 and N2/CO2

    Okabe et al. calculated the electron energy distribution in SF6-N2 mixture and explained that the different distribution of single gas leads to the synergistic effect of gas mixture. As SF6 can...

    Get Price
  • Experimental study on pulse characteristics of negative

    In SF 6 /N 2 gas mixtures, although the number of positive ions generated under the same electric field is more than that generated in air, the strong attachment capacity of gas molecules is expected to make it possible to capture electrons near the beginning of the plasma layer at high applied voltage. The negative-ion cloud is still expected to reduce the electric field in the ionization layer below the ionization threshold, making the disappearance rate of the positive-ion cloud larger

    Get Price
  • Thermogravimetric analysis of the thermal decomposition of

    Oct 01, 2012 · Many methods can be used to carry out the analysis of kinetic data. For the evaluation of the kinetics, four models have already been extensively utilized, namely: (a) model of parallel reactions, (b) the weak bond model, (c) consecutive reaction model and (d) Simha and Wall model [13] .

    Get Price
  • Comparison of SF6/N2 and SF6/CO 2 gas mixtures as

    As a simple and convenient alternative gas, SF6/N2 mixture has no less insulating This work was supported by the National Natural Science Foundation of China (Grant No. 51577150, U1766218), Science...

    Get Price
  • DEW POINTS OF SF6/N2 GAS MIXTURES - ScienceDirect

    Jan 01, 2013 · The compositions 0/100, 20/80, 40/60, 60/40, 80/20 and 100/0 mole % SF6/N2 were prepared. It is understood that the mole % will refer to the ratio of partial pressures of gases upon loading, assuming ideality. The gases used were dry commercial grades, without addi tional purification or drying.

    Get Price
  • (PDF) Buffer-gas pressure influence on multiphoton absorption

    A detailed analysis of the total average number of absorbed photons 〈n〉total during Infrared multiphoton absorption processes in mixtures of SF6–Ar, N2 and CH4 buffer gases is presented.

    Get Price
  • Numerical Simulation of Rod-Plate Gap Streamer Discharge in

    A rod-plate electrode configuration is used with a gap of 4 mm filled with 50~50% SF 6 /N 2 mixed gas at atmospheric pressure (Mpa) and a temperature of 300 K. The applied voltage to rod is −20 KV and the number density of SF 6 /N 2 mixed gas is 2.467 e25 m −3.

    Get Price
  • Measurement of ionization and attachment coefficients in SF6

    A digital computer analysis is used for evaluation of the ionization and attachment coefficients. The variation of (α−η)/p in SF 6 and N 2 mixtures is found to be nonlinear with the percentage mixture ratio. Sparkover voltage measurements are carried out for SF 6, N 2, and SF 6 +N 2 mixtures in the pd interval of 3.5≤pd≤25 Torr cm.

    Get Price
  • CORONA STABILIZATION IN SF6/N2 MIXTURES UNDER IMPULSE

    Jan 01, 2013 · The use of optical multichannel analysis is described to quantify the establishment of corona in a positive point/plane electrode gap for 50/50 SF 6 /N 2 gas mixtures. The system permits spatial and temporal resolution of the emitted light and, in conjunction with other measurements, provides evidence on the mechanism of corona stabilization for a range of pressures and step voltages up to breakdown.

    Get Price
  • ELECTRODE-AREA AND SURFACE-ROUGHNESS EFFECTS ON BREAKDOWN OF

    Jan 01, 1980 · ABSTRACT. The results are reported of a study of dc breakdown between coaxial electrodes in SF 6 /N 2 mixtures at pressures up to 8 bar, in which the effects of electrode material, area and surface roughness have been examined. The mixtures showed less spark conditioning than SF 6 and were slightly less sensitive to electrode-roughness effects.

    Get Price
  • Thermal Decomposition Properties of Epoxy Resin in SF6/N2 Mixture

    In this paper, SF 6 /N 2 mixture gas with the SF 6 volume ratio from 20% to 40% were used in experiment, and the results were compared with those from pure SF 6 and N 2. The sample mass of cured epoxy resin was 20 mg. The gas flow rate was set as 20 mL/min, the heating rate as 10 °C/min heating in the temperature range from 250 °C to 650 °C. 3.

    Get Price
  • Experimental study of SF6/N2 and SF6/CCl2F2 mixtures by the

    Prebreakdown ionization currents have been measured in SF6/N2 and SF6/CCl2F2 mixtures and respective gases by the steady‐state Townsend method over the range of reduced fields 70≤E/p20≤200 V cm−1 T...

    Get Price
  • Pure SF6 and SF6−N2 Mixture Gas Hydrates Equilibrium and

    The kinetics of SF 6 −N 2 mixture gas was controlled by the amount of SF 6 at the initial gas composition as well as N 2 gas incorporation into the S-cage of structure-II hydrate preformed by the SF 6 gas. Raman analysis confirmed the N 2 gas incorporation into the S-cage of structure-II hydrate.

    Get Price
  • COLLISIONAL DECOMPOSITION OF SF6- - NIST

    lower dielectric properties of a SF6/ N2 mixture compared to those of pure SF 6. CID processes provide the dominant destruction mechanism for SF 6- with absolute cross sections approaching 35A2 at higher energies. The decomposition cross sections of SF6- in collisions with N2 are similar to those observed for rare gas targets.

    Get Price
  • VLV - Institute of Physics

    Ultra-Dilute SF6-N2 Mixtures Subjected to Time-Invariant Crossed Fields Mustafa Dincer et al-Effects of vibrationally excited N2 molecules on dielectric breakdown properties of SF6-N2 mixtures Nian Tang et al-This content was downloaded from IP address 207.46.13.164 on 25/06/2019 at 05:13

    Get Price
  • Effect of trace SF6 on negative corona characteristics in SF6

    In such types of SF6or SF6/N2gas mixture insulated power equipment, corona discharge caused by tip defect or conducting particulate contamination will reduce the performance of the insulating gas, and stage transition from corona discharge to gap breakdown will seriously damage the inner insulation of the equipment.

    Get Price
  • Sezai DİNÇER - Yakın Doğu Üniversitesi I neu.edu.tr

    Steady-state ionization growth currents have been measured inN2 and SF6+ N2 mixtures in the E/N range of 1.82 x1015< E/NS 2.58 x1015 V cm2. Least-square analysis is used for the evaluation of apparent ionization, ionization, and attachment coefficients. Experimental E/N limits are ob-served for several SF6 concentrations in the mix-ture.

    Get Price
  • Test Report. (SVHC)

    - a mixture is not classified as hazardous under the CLP Regulation (EC) No 1272/2008, but contains either: (a) a substance posing human health or environmental hazards in an individual concentration of ≥ 1 % by weight for mixtures that are solid or liquids (i.e., non-gaseous mixtures) or ≥ 0.2 % by volume for gaseous mixtures; or

    Get Price
  • (PDF) Simulation of limiting field behavior in electron

    Furthermore, in the E / N range of 606Td, effective ionization coefficients and mean energies in SF6+N2 mixtures are also evaluated with fractional SF6 contents of 0, 20, 40, 60, 80 and 100%. The simulation results obtained are compared with the available data in the literature.

    Get Price
  • Application and Recycling of SF6 gas Mixtures in Gas

    Jun 13, 2017 · In recent years, we develop mixed-gas circuit breakers utilizing SF 6 gas mixtures (SF 6 /CF 4 or SF 6 /N 2) which offer excellent cold-weather performance at temperature as low as -45 °C. The performance of SF 6 gas mixtures is different upon the partner of SF 6 gas and the gas ratio of the mixtures.

    Get Price
  • Low SF6 concentration SF6 / N2 Mixtures for GIL | SpringerLink

    A.H. Cookson and B.O.Pedersen, Analysis of the high voltage breakdown results for mixtures of SF 6 with CO2, N 2 and air, Third Int. Symp. on High Voltage Engineering, 31.10 (Milan, 1979). Google Scholar

    Get Price
  • Calculation of Electron Swarm Parameters in

    Do, A.T., 2016. Analysis of electron transport coefficients in binary mixtures of TEOS gas with Kr, Xe, He, and Ne gases for using in plasma assisted thin film deposition. Journal of Electrical Engineering and Technology, 11(2), pp.455-462. Duzkaya, H., and Tezcan, S.S., 2017. Measurement and calculation of breakdown voltage in CF4 gas mixtures.

    Get Price
  • Salmonellosis Outbreak Among Factory Workers --- Huizhou

    Stratification of bread and congee exposure by cake consumption indicated that only bread eaten on July 12 was associated with gastroenteritis. The cake was baked on July 11, and a mixture that included raw eggs was poured on top; the cake was then stored at room temperature and served for breakfast on 3 consecutive days (July 11--13).

    Get Price
edge-iconMaybe You Will Be Interested
toTop
Click avatar to contact us
Chat Online