Influence of the breakdown mechanism to the left of the Paschen minimum on the breakdown temperature of the free electron gas Maxwell spectrum

Alimpijević, Mališa; Rajović, Zoran; Brajovic, Dragan; Vujisić, Miloš; Stanković, Koviljka

doi:10.1016/j.vacuum.2013.05.007

Cited by 10 publications

(6 citation statements)

References 14 publications

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“…The statistic samples set of the dc voltage breakdown random variables, obtained in such a way, was processed in the following steps: 1 e a statistic sample was subjected to the modified Chauvenet's Test [25] with the aim of rejecting the spurious measurement results; 2 e the dc voltage breakdown mean value was determined, as well as standard deviation; 3 e a significance level was determined according to the Student's distribution for each statistic sample (it has been demonstrated that it is always small and may be disregarded) 4 e based on the dc voltage breakdowns' mean values for certain pressures and interelectrode distances, an experimental Paschen curve was determined for all tested gases (in the region of pd product values, in which measurements were performed); 5 e experimental Paschen curves were fitted by the expression (8), in addition to utilizing the primary ionization coefficient obtained by expressions (2) …”

Section: The Experiments and The Experiments Results' Processingmentioning

confidence: 99%

“…without the electrical field influence, free-electrons' gas spectral distribution (as well as other gas mixture components) is of the Maxwellian type [4,7]. Nevertheless, when such a gas mixture is found within a direct electrical field, one drift component is superpositioned in the direction of the field by thermal speeds of its charged constituting components [8,9]. Generally speaking, in such a case, free electrons and ions' gas spectrum is no longer of the Maxwellian type.…”

Section: Introductionmentioning

confidence: 99%

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The Maxwellian nature of free-electrons' gas spectrum of noble gases at low pressure

Alimpijević¹,

Stanković²,

Ignjatović³

et al. 2014

Vacuum

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Section: The Experiments and The Experiments Results' Processingmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Maxwellian nature of free-electrons' gas spectrum of noble gases at low pressure

Alimpijević¹,

Stanković²,

Ignjatović³

et al. 2014

Vacuum

Self Cite

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“…18,19 Rajovic et al analyzed the relationship between the synergistic effects of SF 6 -N 2 mixtures and the breakdown electron temperature. 20,21 Despotovic et al predicted the synergistic effect from the breakdown electron temperature of a noble gas mixture of He-Ar as well. 22 We studied the breakdown electron temperature in N 2 -O 2 mixtures for different O 2 concentrations and gas pressures and its relationship to the negative ion detachment processes.…”

Section: Introductionmentioning

confidence: 99%

Study of the synergistic effect in dielectric breakdown property of CO2–O2 mixtures

2017

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Sulfur hexafluoride, SF6, is a common dielectric medium for high-voltage electrical equipment, but because it is a potent greenhouse gas, it is important to find less environmentally harmful alternatives. In this paper we explore the use of CO2 and O2 as one alternative. We studied the synergistic effect in a mixture of CO2 and O2 from both macroscopic and microscopic perspectives. The effect leads to a dielectric strength of the mixture being greater than the linear interpolation of the dielectric strengths of the two isolated gases. We analyzed the critical reduced electric field strength, (E/N)cr, the breakdown gas pressure reduced electric field, E/p, and the breakdown electron temperature, Tb, and their synergistic effect coefficients for various CO2 concentrations and various products of the gas pressure times the gap distance (pd). A gas discharge and breakdown mechanism in a homogenous electric field is known to be controlled by the generation and disappearance of free electrons, which strongly depend on the electron temperature. The results indicate that adding a small amount of O2 to CO2 can effectively improve the value of (E/N)cr and bring a clear synergistic effect. In addition, significantly different variation trends of the synergistic effect in the E/p and Tb of CO2-O2 mixtures at various CO2 concentrations and pd values were also observed.

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“…This leads to reshaping the specter of gas charged constitutive partial components [6]. Under the condition of field absence, which otherwise has an impact on the gas constitutive partial components, those above stated components interacting between each other (in accordance with thermal equilibrium) which motion follows the Maxwell spectrum shape.…”

Section: Introductionmentioning

confidence: 99%

“…If the gas is subjected to the electric field then the drift component is added to chaotical motion in the field direction. This leads to reshaping the specter of gas charged constitutive partial components [6]. For understanding the microscopic processes of electrical discharge in gases as well as for predicting their macroscopic effects the free electron gas spectrum is of special interest.…”

Section: Introductionmentioning

confidence: 99%

Free‐Electron Gas Spectrum Uniqueness in the Mixture of Noble Gases

Stanković

Alimpijević

2016

Contrib. Plasma Phys.

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Gas mixtures can reach the Maxwell's specter shape in case of low-ionized mono-atomic mixtures in the weak electric field. The parameters pertaining to the Maxwell spectrum of free electrons' gas straightforwardly settle on the insulating characteristics of the examined gas mixture at the fundamental level. In this paper, a condition for breakdown has been accomplished taking as a starting point the ionization coefficients derived accordingly, as well as the conditions for breakdown in keeping with the Townsend mechanism. The dc breakdown voltage value of noble gases mixture has been measured in the experimental part of the paper. The hypothesis that the free-electron gas spectrum is unique in the noble gas mixture and is of Maxwell's type has been verified.

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Influence of the breakdown mechanism to the left of the Paschen minimum on the breakdown temperature of the free electron gas Maxwell spectrum

Cited by 10 publications

References 14 publications

The Maxwellian nature of free-electrons' gas spectrum of noble gases at low pressure

The Maxwellian nature of free-electrons' gas spectrum of noble gases at low pressure

Study of the synergistic effect in dielectric breakdown property of CO2–O2 mixtures

Free‐Electron Gas Spectrum Uniqueness in the Mixture of Noble Gases

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