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used SF6 N2 Mixtures device

used SF6 N2 Mixtures device

SF6 + N2. Therefore, the addition of N~ to CF4 and SF6 was concluded to be suitable for etching the W film under the gas mixtures examined, while maintaining a practical, useful high etching rate ratio of the W to the photoresist. Moreover, the GaAs etching rate was negligibly low un-

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  • Separation of CF4/N2, C2F6/N2, and SF6/N2 Mixtures in

    The capture and separation of CF4, C2F6, and SF6 and their mixtures containing nitrogen is a challenging process. To solve this, we propose the use of saccharose coke-based carbons as membranes for the adsorption and separation of these gases. By means of advanced techniques of Monte Carlo and molecular dynamics simulations, we have studied the adsorption and diffusion of CF4, C2F6, and SF6 as

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  • Calculation of Discharge Inception Voltages in SF6-N2 Mixtures

    Abstract: A simple method based on the streamer criterion [1] is proposed to calculate the discharge inception voltages in SF6-N2 mixtures with SF6 content between 1 and 100%. It is shown that the calculated values are in good agreement with experimental measurements for gaps having varying degrees of field non-uniformities.

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

    Feb 15, 2015 · 1. Introduction. Sulfur hexafluoride (SF 6) has been widely used as an insulating and etching gas in the electric industry due to its chemical stability, non-toxicity, non-combustibility, and good insulating characteristics , ; however, SF 6 is a very potent greenhouse gas since its global warming potential (GWP) is 23,900 times higher than CO 2, and its lifetime is estimated to be 3200 years

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  • DEW POINTS OF SF6/N2 GAS MIXTURES - ScienceDirect

    Jan 01, 2013 · DEW POINTS OF SF6/N2 GAS MIXTURES K. B. Miners*, M. J. Mastroianni**, P. N. Sheldon* and D. P. Wilson* *Allied Chemical, Buffalo Research Laboratory (BRL) 20 Peabody Street, Buffalo, N.Y. 14210 **Halocarbon Products Corp. 82 Burlews Court, Hackensack, N.J. 07601 ABSTRACT Electrical utilities and OEM1s have voiced concern over the possibility of conden sation of SF. in GIE (gas-insulated

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

    Sulfur hexafluoride (SF6), whether pure or mixed with inexpensive inert gas, has been widely used in a variety of industrial processes, but it is one of the most potent greenhouse gases. For this reason, it is necessary to separate and/or collect it from waste gas streams. In this study, we investigated the pure SF6 and SF6−N2 mixture gas hydrates formation equilibrium as well as the gas

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  • Recovery of SF6 from N2/SF6 Gas Mixtures by Using a Polymer

    SF6 and SF6-N2 mixed gases are used widely as insulators, but such gases have high greenhouse gas potential. The separation of SF6 from SF6-N2 mixed gases is an inevitable result of their use.

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  • SF6 reclaimer from SF6/N2 mixtures by gas separation with

    The influence of mixture composition on the mutual diffusion coefficients and shear viscosities was investigated by a series of molecular dynamic simulations of SF6/N2 mixtures with different

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  • Chemical Decomposition of High Pressure SF6/N2 (5:95

    In order to comply with this aim, one of the solutions adopted by the manufacturers and the users of some of these equipments, consists in reducing the quantity of SF 6 used by mixing it with zero (or very much lower) risk gases.For instance, as SF 6 /N 2 mixtures with SF 6 concentrations lying between 5 and 15% realise a satisfactory

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  • (PDF) Impulse Insulation Property of SF6/N2 Mixture Under Low

    Dec 31, 2017 · SF6/N2 gas mixture is a temporary choice for SF6 replacement as insulation dielectrics. We used the collision ionization theory to illustrate the mechanism of the temperature influence on the...

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  • Breakdown Strength of N2-SF6 Gas Mixtures Containing 10% and

    SF6 as insulating gas has a very good dielectric strength. Therefore, SF6 is used in many applications. Nowadays, it is investigated again whether SF6-N2 mixtures can replace pure SF6in for example...

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  • Cold Weather Applications of Gas Mixture (SF6/N2, SF6/CF4

    down to ambient temperatures of -50ºC without the use of heaters •To meet this requirement manufacturers must: •Provide a gas mixture to avoid liquefaction of the SF. 6. gas at low temperatures •Test the mechanical operation of the circuit breaker at -50ºC according to the low-temperature cycle test defined in IEC 56

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  • Toeplerspark law in a GIS with compressed SF6-N2 mixture

    Toeplerspark law in a GIS with compressed SF6-N2 mixture. July 2003; IEEE Transactions on Dielectrics and Electrical Insulation 10(3 with the continuous increase in the device voltage level

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  • IMPULSE BREAKDOWN IN SF6, SF6/N2 AND SF6/N2/PERFLUOROCARBON

    Jan 01, 2013 · IMPULSE BREAKDOWN IN SF 6 , SF 6 /N 2 AND SF6/N2/PERFLUOROCARBON MIXTURES A. Fatheddin* M. 0. Pace,* L. G. Christophorou,* and R. Y. Pai + Atomic, Molecular and High Voltage Physics Group, Health and Safety Research Division, Oak Ridge National Laboratory, Oak Ridge, TN 37830 *Also, The University of Tennessee, Knoxville, TN 37916 +GTE Products Corp., Danvers, MA 19230 ABSTRACT The impulse

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  • Experimental study on pulse characteristics of negative

    The effects of gas pressure, gap spacing, and the gas-mixture ratio on onset voltage at the pulse stage in SF 6 /N 2 gas mixtures are experimentally measured, as shown in Fig. 7. Figures 7(a) and 7(b) present the variation in onset voltage at the pulse stage in SF6/N2 gas mixtures under different gas pressures and gap spacings, in which the gas

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  • Breakdown Gradients in SF6-N2, SF6-Air and SF6-CO2 Mixtures

    Abstract: A method to calculate the uniform field breakdown gradients for SF6-N2, SF6-air and SF6-CO2 mixtures is discussed. Calculated values of the breakdown gradients in these mixtures are compared with experimentally measured values using plane-plane electrode configuration and direct applied voltages.

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  • A Study on Dielectric Strength and Insulation Property of SF

    Feb 01, 2012 · of SF6/N2 Mixtures for GIS Su-Youl Woo † , Dong-Hoon Jeong*, Kyoung-Bo Seo* and Jin-Ho Kim* Abstract – SF 6 (sulphur hexafluoride) is the gas most commonly used in high voltage power equipments.

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  • Effect of trace SF6 on negative corona characteristics in SF6

    Taking the gas-mixture ratio φ(SF 6):φ(N 2) = 0.1:99.9, which is the ratio of the gas mixtures with the normal-glow stage appearing for the first time in the experiments, as an example, the positive-ion fluxes in the Townsend stage and the normal-glow stage can be estimated as follows.

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  • Static Field Breakdown of SF6-N2 Mixtures in Rod-Plane Gaps

    The static field breakdown and corona characteristics of SF6-N2 mixtures in non-uniform field gaps for applied voltages of positive and negative polarities are discussed. Mixtures containing 0 to 100% SF6 are studied over a pressure range of 100 to 500 kPa. The results show that for such gaps, the dielectric behavior of SF6-N2 mixtures is very similar to that of pure SF6. A discontinuity is

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  • Application of SF6 mixture gases in GIS in Northern China

    mixtures. There are hundreds of SF 6 mixed-gas circuit breakers used in Northern China to avoid cold weather breakdown. As the population of SF 6 mixtures circuit breakers in China continues to grow, we have carried out plenty of work to investigate SF 6 mixture preparing and recycling. 2 SF 6 Mixed-gas Circuit Breakers in Northern China

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  • SF6 Reclaimer from SF6/ N2 Mixtures by Gas Separation with

    Discussing various methods for SF6 separation from a mixture of low concentrations of SF6 in N2, pressure swing adsorption (PSA) with a suitable kind of synthetic zeolite, which is expected molecular sieving effect, has been selected. This molecular sieving effect, derived from molecular size difference between SF6 and N2, is confirmed by the difference between two equivalent volumes filled

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  • SF6/N2 Mixtures for HV Equipment and Practical Problems

    Abstract. Since SF 6 gas has a high dielectric performance and interrupting capability, it is used widely in the Electric Power Industry. Recently, it is recognized that SF 6 gas is a greenhouse gas and therefore, SF 6 /N 2 gas mixtures are proposed as a replacement of pure SF 6.

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  • SF6 By-products: Safety, Cleaning, and Disposal Concerns

    – Use of personal protective equipment (i.e., respiratory device, protective clothing such as rubber gloves, footwear, goggles) for removal/handling of solid SF 6 byproducts – Ventilate and test enclosed areas for adequate O 2 prior to initiating clean up

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  • Use of Zeolite Filter in Portable Equipment for Recovering

    Use of Zeolite Filter in Portable Equipment for Recovering SF6 in SF6/N2 Mixtures March 2004 IEEE Transactions on Dielectrics and Electrical Insulation 11(1):166 - 173

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  • Development of the SF6/N2 Gas Mixture Insulated Transformer

    Abstract. SF 6 gas found its use in China as an insulating medium in 1971 when Xi’an High Voltage Switchgear Research Institute developed the first Chinese GIS rated 110kV for a hydroelectric power station. in 1975 Xi’an Electric Power Capacitor Factory and Xi’an Jiaotong University jointly developed the first 500kV SF 6 gas-insulated standard capacitor in China. and as an extension of

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  • Comparisons of GaAs, Tungsten, and Photoresist Etch Rates and

    SF6 + N2. Therefore, the addition of N~ to CF4 and SF6 was concluded to be suitable for etching the W film under the gas mixtures examined, while maintaining a practical, useful high etching rate ratio of the W to the photoresist. Moreover, the GaAs etching rate was negligibly low un-

    Get Price
  • Optimal feature selection for defect recognition in varying

    Using an external UHF coupler the maximum envelope (ME) of PD signatures for defects in SF 6:N 2 mixtures is extracted from data recorded at 1 GHz. Statistical features of skewness, kurtosis and variance are computed on the positive and negative half cycles of the phase resolved ME and is used as inputs into an artificial neural network (ANN).

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  • A New Concentration Detection System for SF6/N2 Mixture Gas

    solved by the mixture of SF6/N2 (e.g., the liquefaction point of -42℃under 0.6 MPa). As a result, the SF. 6 /N. 2. mixture gas is gradually replacing the SF. 6. gas in extra/ultra-high voltage transmission systems [21-23]. For . A New Concentration Detection System for SF. 6 /N. 2. Mixture Gas in Extra/Ultra High Voltage Power Transmission

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  • Cold Weather Applications of Gas Mixture (SF6/N2 and SF6/CF4

    Apr 01, 2016 · Cold Weather Applications of Gas Mixture (SF6/N2 and SF6/CF4) Circuit Breakers: A Utility User’s Perspective - Paper (PDF) (8 pp, 839 K) Contact Us to ask a question, provide feedback, or report a problem.

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  • High SF6/N2 selectivity in a hydrothermally stable zirconium

    Sep 15, 2015 · A hydrothermally stable, zirconium-based metal–organic framework called UiO-66-Zr has been studied for its ability to separate SF 6 from SF 6 /N 2 mixtures. The ideal adsorbed solution theory (IAST)-predicted selectivities based on single-component isotherms and the dynamic breakthrough calculations for mixture conditions demonstrate that UiO-66-Zr can effectively separate SF 6 /N 2 mixtures.

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  • Separation of SF6 from Gas Mixtures Using Gas Hydrate

    Jul 27, 2010 · This study aims to examine the thermodynamic feasibility of separating sulfur hexafluoride (SF6), which is widely used in various industrial fields and is one of the most potent greenhouse gases, from gas mixtures using gas hydrate formation. The key process variables of hydrate phase equilibria, pressure−composition diagram, formation kinetics, and structure identification of the mixed gas

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