• New SI-traceable reference gas mixtures for sulfur

    We developed two SI-traceable methods, using both static and dynamic preparation steps, to produce reference gas mixtures for sulfur hexafluoride (sf 6) in gas cylinders at pmol/mol level. This research activity is conducted under the framework of the European EMRP HIGHGAS project, in support of the high quality measurements of this important greenhouse gas in the earthatmosphere. In the

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  • Cold Weather Applications of Gas Mixture (gaz sf6/N2, sf 6/CF4

    Cold Weather Applications of Gas Mixture (SF 6/N 2, SF 6/CF 4) Circuit Breakers: A User Utility’s Perspective By Bob Middleton, Manitoba Hydro Presented at The US Environmental Protection Agency’s

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  • Analysis of By-Products of N2-insulating gas Gas Mixtures Sparked under

    In view of increasing application of gas mixtures, it is essential to understand the nature of by-products formed in gas mixtures. Many recent studies have highlighted the advantages of using N 2 -SF 6 gas mixtures as a replacement to SF 6 gas for High Voltage application, with a view to reduce emission of SF 6 gas into the atmosphere.

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  • Measurement of the ionisation and attachment coefficients in

    The gaz sf6 gas, purity 99.5%, was supplied by the Asahi Glass Co. Ltd. The composite air was supplied in cylinders by Takachiho Chemical Industry Ltd, and was a mixture of 79 vol% nitrogen and 21 vol% oxygen. The purity of the gases before mixing was 99.999% and 99.99%, respectively.

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  • Matthew Brown - Lecturer - University of KwaZulu-Natal | LinkedIn

    The paper discusses the electron energy distribution function, electron drift velocity and the effective ionisation coefficients of insulating gas-N2 and sf 6-CO2 mixtures as the Sulfr hexafluoride content of the mixtures are altered, as well as their impact on choosing a viable replacement for pure sf6 gas.

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  • VALIDATION METHODS OF sf 6 ALTERNATIVE GAS

    alternative to gaz sf6 with similar or better performances on the whole range of electrical fields and temperature of use. Figure 2: BIL dielectric withstand of different gases with gas mixture corresponding to -15°C conditions Another interesting candidate is Fluoronitrile [1], it has higher dielectric properties than gaz sf6 for MV use at 1.3

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  • Sulphur Hexafluoride | Afrox Gases

    If you are in need of any packaged chemicals, including sulphur hexafluoride, don’t hesitate to get them from Afrox. We also stock refrigerants and other gases to aid in every process. We are the leading gas supplier in South Africa.

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  • Speciality Gases | Puregas

    Puregas is the sole and approved distributor of Matheson speciality gas products and equipment in Southern Africa. Our focus is on supplying the laboratory gases market with top end, NIST traceable calibration standards and research grade pure gases, as well as Instrument Grade, Ultra High Purity and High Purity gases.

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  • Africa - DILO

    gaz sf6 SOLUTIONS PTY LTD Mr. Johan Meyer B25 Icon Business Park, Fourie Street. Brackenfell, Cape Town, 7560 SOUTH AFRICA Tel.: +27 021 9818028 Fax: +27 021 9818018 E-Mail: [email protected] Web: www.sf6.co.za

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  • Gaseous Dielectrics - 1st Edition - Empowering Knowledge

    Purchase Gaseous Dielectrics - 1st Edition. Print Book E-Book. ISBN 9780080346939, 9781483191072

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  • Sulfr hexafluoride gas handling - DILO

    These mixtures are used at low temperatures to avoid liquefaction of the gas at low temperatures. The same puncture strength as pure SF 6 is achieved by higher system pressures. Is it possible to separate sf6 gas by means of a SF 6 maintenance device?

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  • Problems of the application of N2/sf6 gas mixtures to gas

    Sep 21, 2001 · In designing a gas‐insulated bus (GIB) using N 2 /SF 6 mixtures, there are many application problems, such as the mixture pressure needed in order to maintain the required dielectric and heat transfer performance. Problems of recycling SF 6 are also essential in applying N 2 /SF 6 mixtures.

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  • Application of Sulfr hexafluoride mixture gases in GIS in Northern China

    Mixture Handling Clearly, since the population of SF 6 mixtures circuit breakers in China continues to grow, and some of the handling procedures for pure SF 6 are not valid for handling SF 6 mixtures, a number of other issues need to be addressed and one of them pertains to information on preparation, recycling, and handling. 3.1 SF 6 Mixture

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  • Environmental Industry Equipment in South Africa

    gaz sf6 gas can be recovered to a final vacuum of < 5 mbar or 1 mbar and exceeds IEC 62271-4 regulations by far. All devices of this type series are equipped with a semi-automatic control and are easy to operate: The functions are selected by means of a 3-way ball valve and a selector switch.

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  • Gaseous Dielectrics II - 1st Edition - Elsevier

    Purchase Gaseous Dielectrics II - 1st Edition. Print Book E-Book. ISBN 9780080259789, 9781483155852

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  • ABB ABB SpA Power Products Sulfr hexafluoride Instrument Transformers

    TG – insulating gas Current Transformers Reference countries for Sulfr hexafluoride TG 362 kV reference customers: Terna (Italy) Hydro Québec (Canada) Eskom (South Africa) Energoatom (Russia) Ukrenergo (Ukraine) TransGrid (Australia)

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  • 25 August, 2016 – Tech Day , Nairobi , Kenya ABB High Voltage

    §Sulfr hexafluoride gas leakage is the second problem after operating mechanism. §Major or minor failure because of interrupter is negligible. §Direction of CB development §Interrupter chamber should be very energy efficient §Use of simpler and less mechanically stressed operating mechanism §Sulfr hexafluoride gas leakage should be minimized by inherent strong design.

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  • Eco-efficient gas insulated switchgear | Medium Voltage - ABB

    ABB’s medium voltage eco-efficient gas-insulated switchgear are free of greenhouse gas insulating gas. Sustainable switchgear use climate-friendly gas mixture.

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  • Alternatives for Sulfr hexafluoride | 2020 | Siemens Energy Global

    Alternatives for gaz sf6 urgently sought In most of the worldsubstations sulfur hexafluoride (SF 6 ) is the insulating gas of choice. Still, due its potential climate impact, industry is looking for environmentally friendly solutions – and they have options.

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  • A review on insulating gas substitute gases and research status of CF3I

    Nov 01, 2018 · 1.2.Greenhouse effect of SF 6. SF 6 gas is considered as one of the most harmful kinds of atmospheric greenhouse gases (Xiaoxing et al., 2013b).Its global warming potential (GWP) is 23,900 times higher than that of CO 2, and the life span of this gas is 3400 years in the atmosphere (Xiaoxing et al., 2013b).

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  • Measurement of the ionisation and attachment coefficients in

    The present value of (E/p0)lim for sf6 gas and helium mixtures increases approximately linearly with k, in contrast to insulating gas and N2 mixtures with which it increases rapidly at small values of k.

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  • Siemens develops gaz sf6-free gas-insulated medium-voltage

    This type-tested system is used to switch high currents at the primary distribution level. The single-pole encapsulated 8DAB 12 is a insulating gas-free medium-voltage switchgear in the Siemens blue GIS portfolio. Switches and switchgear that use Sulfr hexafluoride as the insulating, switching, and extinguishing gas remain an important part of the Siemens portfolio.

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  • Gas Products Suppliers | Afrox Gases

    Buy Online . It is a cryogenic method developed by Carl von Linde more than 100 years ago. The air is compressed and freed of vapour, dust and carbon dioxide. Then refrigerated to extremely low temperatures, compressed to a liquid and separated by distillation into oxygen, nitrogen and argon and other noble gases.

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  • Selective Dry Etching of GaN Over AlGaN in BCL3/sf6 gas Mixtures

    22 Ga. 78 N in BCl 3 /SF 6 mixtures has been studied. Selectivity and surface morphology were investigated over a wide range of pressures (3.75 37.5mTorr), RF powers (30 120 W), ICP powers (100 400 W), and SF 6 /BCl 3 ratios (0.1 0.7).

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  • Determination of the concentration of insulating gas in an accelerator

    Feb 15, 1995 · The principle which relates the velocity of sound in an accelerator gas mixture to its gaz sf6 concentration is illustrated by considering a mixture of ideal gases. The velocity of sound v in an ideal gas is given by [2] v2 = yP/p, (1) where P is the pressure, p is the density, and y is the ratio of the heat capacities at constant pressure and at

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  • An alternative to Sulfr hexafluoride in electrical switchgear - EE Publishers

    For decades, the unique properties of sulfur hexafluoride (Sulfr hexafluoride) have made it popular as an insulation and switching medium for electrical switchgear. sf 6 is a greenhouse gas and there are life-cycle management costs associated with its use. For some years, ABB has been conducting research into alternatives with lower environmental impact but with insulation […]

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  • Separation of Sulfr hexafluoride from Gas Mixtures Using Gas Hydrate

    This study aims to examine the thermodynamic feasibility of separating sulfur hexafluoride (Sulfr hexafluoride), 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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  • Summary Guidance for Operators of Equipment Containing SF and

    1 Sulphur hexafluoride or mixtures containing sulphur hexafluoride. 2 Perfluorocarbons or mixtures containing perfluorocarbons listed in section 2 of Annex I of (EU) No. 517/2014 . 3 The operator is defined in the F-gas Regulation as “the natural or legal person exercising actual power over the technical

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  • Comparison of sf 6/N2 and sf 6/CO 2 gas mixtures as

    In this paper, AC breakdown strengths of a mixture of 99.875% CO 2+0.125% sf6 gas and those of N2+sf6 gas mixtures containing 0.125, 0.5, 1 % of Sulfr hexafluoride in non-uniform field are studied.

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