Investigations of the properties of SF<sub>6</sub>as an arc quenching medium

Hertz, W.; Motschmann, H.; Wittel, H.

doi:10.1109/proc.1971.8207

Cited by 48 publications

(14 citation statements)

References 6 publications

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“…Since the 1970s, researchers have studied the use of gas mixture including SF 6 and some buffer gases such as N 2 , CO 2 , Ar, He, air, etc. to replace pure SF 6 as the insulation medium [3][4][5]. With further study, researchers found that the insulation characteristics of gas mixtures containing SF 6 gas did not increase linearly according to the mixing ratio of SF 6 , and the electrical strength of the mixture was higher than the weighted average of the electrical strength of the two gas components.…”

Section: Introductionmentioning

confidence: 99%

Research Progress on Synergistic Effect between Insulation Gas Mixtures

Zhao¹,

Xiao²

2020

Modern Applications of Electrostatics and Dielectrics

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Synergetic effect is a special gas discharge phenomenon among insulating gas mixtures, which has important reference value for gas selection of future gasinsulated power equipment. The research progress and investigation methods of synergistic effect and insulation characteristics of different gas mixtures at home and abroad are reviewed in this chapter. The synergistic effect between different kinds of gas mixtures including SF 6 gas mixtures and some new insulation gases such as cC 4 F 8 , CF 3 I, and C 4 F 7 N is presented. Combined with the results of multiple studies, it can be seen that the synergistic effect of the gas mixture has a certain relationship with the electronic transport parameters and discharge patterns. Besides, the synergistic effect of the same gas mixture may change with the change of external conditions such as gas pressure, voltage type, and electrode distance.

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Section: Introductionmentioning

confidence: 99%

Research Progress on Synergistic Effect between Insulation Gas Mixtures

Zhao¹,

Xiao²

2020

Modern Applications of Electrostatics and Dielectrics

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“…The arc (the gaseous medium) between the arcing contacts is a key element responsible for current interruption. For high-voltage circuitbreakers, SF 6 is exclusively used because of its high insulation strength and high interruption capability of fault current. The interruption of alternate current relies on the instantaneous current passing through its zero points.…”

Section: Introductionmentioning

confidence: 99%

“…The accuracy of the property database is a key aspect in producing correct modeling results. This paper is aimed at presenting the calculation methods and the results related to the composition, the thermodynamic properties and transport coefficients of a twotemperature SF 6 plasma, in the pressure range between 0.01 and 2 MPa, for an electron temperature in the range 300-40 000 K.…”

Section: Introductionmentioning

confidence: 99%

“…[5][6][7][8][9][10][11][12][13] For two-temperature plasmas, different authors have recently displayed calculations of the composition, thermodynamic, and transport properties for some pure gases and some gas mixtures. [14][15][16][17][18][19][20][21][22][23][24][25] As for pure SF 6 gas, several papers have so far dealt with the particle compositions in twotemperature state. [26][27][28][29] The determination of twotemperature plasma composition as a function of pressure, electron temperature, and heavy particles temperature is closely related to the mass action law of different reactions (Saha and Guldberg-Waage laws), the Dalton's law, species conservation law together with the electrical quasineutrality condition.…”

Section: Introductionmentioning

confidence: 99%

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Thermodynamic and transport properties of two-temperature SF6 plasmas

Wang

Rong

et al. 2012

Physics of Plasmas

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This paper deals with thermodynamic and transport properties of SF 6 plasmas in a two-temperature model for both thermal equilibrium and non-equilibrium conditions. The species composition and thermodynamic properties are numerically determined using the two-temperature Saha equation and Guldberg-Waage equation according to deviation of van de Sanden et al. Transport properties including diffusion coefficient, viscosity, thermal conductivity, and electrical conductivity are calculated with most recent collision interaction potentials by adopting Devoto's electron and heavy particle decoupling approach but expanded to the third-order approximation (second-order for viscosity) in the frame of Chapman-Enskog method. The results are computed for various values of pressures from 0.1 atm to 10 atm and ratios of the electron temperature to the heavy particle temperature from 1 to 20 with electron temperature range from 300 to 40 000 K. In the local thermodynamic equilibrium regime, results are compared with available results of previously published studies. V C 2012 American Institute of Physics. [http://dx.

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“…After current interruption an SF 6 arc plasma recovers its dielectric strength very quickly, resulting in SF 6 circuit breakers being able to withstand high rates of rise of recovery voltage. The excellent quenching properties of SF 6 are explained by the particle composition and the electrical and thermal conductivities of the SF 6 arc plasma [10,11], related to important electron density reduction and to high temperature gradients at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

The effects of moisture and gaseous additives on SF6 recovery characteristics

Spiliopoulos¹

2006

Euro. Trans. Electr. Power

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SUMMARYIn order to investigate the intrinsic recovery characteristics of SF 6 an idealized model-breaker experiment is designed. The experimental simulation of the interruption phenomena offers the possibility to study the evolution of the free-decaying plasma dielectric strength against the recovery time. The effect of gaseous additives such as air, nitrogen and oxygen on the SF 6 recovery characteristics has been researched. The obtained recovery curves show distinct phases as for pure SF 6 . The influence depends on the gaseous additive nature and its proportion to the gaseous mixture. The presence of water vapor (humidity) in the breaking chamber is proved to be a degradation agent of the SF 6 insulating and recovery properties. Both dielectric and post-arc recovery studies show that the gas dielectric strength reduces with the increment of the humidity concentration.

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Investigations of the properties of SF₆as an arc quenching medium

Cited by 48 publications

References 6 publications

Research Progress on Synergistic Effect between Insulation Gas Mixtures

Research Progress on Synergistic Effect between Insulation Gas Mixtures

Thermodynamic and transport properties of two-temperature SF6 plasmas

The effects of moisture and gaseous additives on SF6 recovery characteristics

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Investigations of the properties of SF6as an arc quenching medium

Cited by 48 publications

References 6 publications

Research Progress on Synergistic Effect between Insulation Gas Mixtures

Research Progress on Synergistic Effect between Insulation Gas Mixtures

Thermodynamic and transport properties of two-temperature SF6 plasmas

The effects of moisture and gaseous additives on SF6 recovery characteristics

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Investigations of the properties of SF₆as an arc quenching medium