Dielectric Strength, Boiling Point and Toxicity of Gases - Different Aspects of the Same Basic Molecular Properties

Brand, K. P.

doi:10.1109/tei.1982.298489

Cited by 65 publications

(36 citation statements)

References 12 publications

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“…To avoid such complications, the relative dielectric strength ( E r ) with respect to SF 6 was used in this work because our aim is to design SF 6 replacement molecules. The experimental data for numerous dielectrics were critically evaluated with the criteria as suggested by Brand, namely, (1) use of special shaped profiles which assure a homogeneous field; (2) a single range of pressure and electrode spacing; (3) values consistent with those of other authors. In addition, only the experiments in which SF 6 was measured as an internal reference have been taken into account .…”

Section: Methodsmentioning

confidence: 99%

“…However, many glaring contradictions to this trend arise when individual gases were compared. Based on a critically selected database, Brand found that dielectric strength and normal boiling temperature can be related to dipole polarizability and ionization potential of the gas molecule, despite scattering of the data . Meurice and coworkers reported that the dielectric strength varies accordingly with the integrated optical absorption .…”

Section: Introductionmentioning

confidence: 99%

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Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF₆

Hou

Wang

2017

J Comput Chem

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Developing the environment-friendly insulation gases to replace sulfur hexafluoride (SF ) has attracted considerable experimental and theoretical attentions but without success. A computational methodology was presented herein for prediction on dielectric strength and boiling point of arbitrary gaseous molecules in the purpose of molecular design and screening. New structure-activity relationship (SAR) models have been established by combining the density-dependent properties of the electrostatic potential surface, including surface area and the statistical variance of the surface potentials, with the molecular properties including polarizability, electronegativity, and hardness. All the descriptors in the SAR models were calculated using density functional theory. The substitution effect of SF by various functional groups was studied systematically. It was found that CF is the most effective functional group to improve the dielectric strength due to the large surface area and polarizability. However, all the substitutes exhibit higher boiling points than SF because the molecular hardness decreases. The balance between E and T could be achieved by minimizing the local polarity of the molecules. SF CN and SF CFO were found to be the potent candidates to replace SF in view of their large dielectric strengths and low boiling points. © 2017 Wiley Periodicals, Inc.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF₆

Hou

Wang

2017

J Comput Chem

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“…In addition, Boltzmann solvers as well as Monte Carlo methods in general do not account for three-body processes, which may get relevant at higher pressures [17,18]. Facing these difficulties of kinetic modelling, several empirical estimation methods for the ES have been developed, analyzing the correlation between the ES, as well as TB, and certain molecular properties [19][20][21][22][23]. Stronger correlations than in these studies, we could find in a previous work by means of predictor variables [8], which are simple functions of the molecular properties: electric dipole moment, average static electronic polarizability, vertical/adiabatic ionization energy, vertical/adiabatic electron affinity, electron number and molecular mass.…”

Section: Estimation Of Es and Tbmentioning

confidence: 99%

Computational screening of new high voltage insulation gases with low global warming potential

Rabie

Franck

2015

IEEE Trans. Dielect. Electr. Insul.

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We systematically screen chemical compounds for their suitability as high voltage insulation gases on the basis of electrical, environmental and safety characteristics. Recently, 1234 compounds were identified out of a library of over 56000 chemicals by means of virtual screening. The authors applied filters for the global warming potential (GWP), toxicity, stability, flammability and critical temperature to find promising candidate refrigerant fluids. We estimate the electric strength (ES) and the boiling point of these environmentally friendly compounds to select promising SF6 replacement candidates. The most promising candidates within our method are predominantly Fluoro-alkenes, -alkylsulfides, -alcohols and-alkylamines. In addition, risk and safety data was compiled for compounds that are supplied by chemical vendors at this date, resulting in 7 preliminary candidates.

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“…The descriptor values were molecular properties derived from density functional theory (DFT) calculations. From literature [25,4,26,27] a set of 48 polar and 19 non-polar molecules has been extracted for which the electric strength is known. The descriptor variables found to be important are: a) average static electronic polarizability α, b) electric dipole moment µ, c) vertical ionization energy ǫ [24].…”

Section: Efficient Pre-selectionmentioning

confidence: 99%

“…To date, only synthetic air [1] and SF 6 /N 2 [2] mixtures are seriously accepted alternatives. Besides that, numerous other gases have been investigated and partly compared [3,4,5,6]. However, a systematic search strategy to find alternatives has not been developed.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Procedure to Identify and Quantify New Molecules for Insulating Gas Mixtures

Franck

Dahl

Rabie

et al. 2013

Contrib. Plasma Phys.

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Author(s):Franck, Christian M.; Dahl, Dominik A.; Rabie, M.; Haefliger, P.; Koch, M. Publication Date: 2014 Permanent Link:https://doi.org/10.3929/ethz-a-010881816 Originally published in:Contributions to plasma physics 54(1), http://doi.org/10.1002/ctpp.201300030 Rights / License:In Copyright -Non-Commercial Use Permitted This page was generated automatically upon download from the ETH Zurich Research Collection. For more information please consult the Terms of use. ETH LibraryThis is the pre-peer reviewed version of the following article: In this contribution, a new procedure to systematically identify and quantify novel molecular gases with low global warming potential for application in high voltage insulation as gas mixtures is presented. The attention is focused on highly efficient procedures to be able to scan a large number of candidate gases. To identify new molecules, we derived an empirical correlation between the electric strength of a gas and certain molecular properties, like polarizability or dipole moment, which can be calculated by means of density functional theory. The swarm parameters of these pre-selected molecules in mixtures with buffer gases is then quantified, using a newly set-up Pulsed Townsend experiment. The setup operates with a high degree of automation to enable systematic evaluation of gas mixtures not to miss possible synergistic effects. Key element of this PT setup is a new photocathode that works with a high quantum efficiency and long lifetime even when exposed to reactive species during the measurements. Moreover, for an automated operation it is important to know precisely in which range the experiment can be operated, i.e. for example to know up to which electron density space charge effects can be neglected. Finally, the measured swarm parameters need to be translated into breakdown voltage strengths of different electrode arrangements and different applied voltage wave shapes. For this, a model of the the streamer to leader transition in SF6 will be applied to general strong electronegative gases in future studies.

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Dielectric Strength, Boiling Point and Toxicity of Gases - Different Aspects of the Same Basic Molecular Properties

Cited by 65 publications

References 12 publications

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF₆

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF₆

Computational screening of new high voltage insulation gases with low global warming potential

An Efficient Procedure to Identify and Quantify New Molecules for Insulating Gas Mixtures

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Dielectric Strength, Boiling Point and Toxicity of Gases - Different Aspects of the Same Basic Molecular Properties

Cited by 65 publications

References 12 publications

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF6

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF6

Computational screening of new high voltage insulation gases with low global warming potential

An Efficient Procedure to Identify and Quantify New Molecules for Insulating Gas Mixtures

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Product

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Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF₆

Prediction on dielectric strength and boiling point of gaseous molecules for replacement of SF₆