Dielectric properties of SF6 mixtures containing oxygen and other gases

Láska, L.; Mašek, K.; Krása, J.; Peřina, Vratislav

doi:10.1007/bf01590097

Cited by 13 publications

(7 citation statements)

References 21 publications

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“…One of the possible effects accounting for this is that the dissociation rate for SF 6 drops when O 2 is added, e.g., due to the influence of O 2 in reducing the mean electron energy within the discharge. Also, it is suggested by theoretical calculation of electron energy distributions in SF 6 /O 2 mixtures by Mašek et al [16]. In addition, H 2 O is a gas as weakly electronegative as O 2 .…”

Section: Influence Of the Moisture Content (Adsorbent)mentioning

confidence: 94%

Decomposition characteristics of SF₆ under partial discharges with point-to-plane electrode defect

Ding

Zhou

Ren

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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Field experience shows that the long-term existence of the partial discharge (PD) in gas-insulated switchgear (GIS) will gradually erode the insulation and ultimately cause disastrous insulation breakdown. The decomposition compound analysis of SF 6 in GIS is an effective method to diagnose the PDs caused by insulation defects. It is significant to clarify the decomposition characteristics of SF 6 under PDs, which is common in GIS. In this paper the discharge energy/charge and SF 6 decomposition under PDs with point-to-plane electrode defect were investigated under different factors such as needle curvature, applied voltage, gas pressure and moisture content (adsorbent). And the feature extraction of SF 6 decomposition under PDs was also discussed. The results show that the yields of SOF 2 , SO 2 F 2 and SO 2 tend to increase approximately linearly with the accumulation of PD energy. In addition, the needle curvature and applied voltage have a great influence on the discharge energy/charge and the yield of SOF 2 /SO 2 F 2 . Also, the adsorbents composed of KDHF-03 or F-03 have a certain effect on the discharge energy. Besides, the discharge energy and charge tend to decrease with the increased moisture content, and the yields of SOF 2 , SO 2 F 2 and SO 2 are affected by the humidity (250 L/L -2500 L/L) observably.Index Terms -Decomposition compound analysis, gas insulated switchgear, pointto-plane electrode defect, SF 6 .

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Section: Influence Of the Moisture Content (Adsorbent)mentioning

confidence: 94%

Decomposition characteristics of SF₆ under partial discharges with point-to-plane electrode defect

Ding

Zhou

Ren

et al. 2013

IEEE Trans. Dielect. Electr. Insul.

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“…This is also known as Einstein's relation. By using the drift velocity v d equation, the reduced ionization and attachment coefficients are calculated as follows, (Lucas et al, 1973;Láska, et al 1984;Loureiro and Amorim, 2016;Othman, et al, 2019b),…”

Section: The Transport Parametersmentioning

confidence: 99%

“…The reduced critical electric field strength (E/N) crt. is calculated when reduced ionization coefficient (α/N) and the reduced attachment coefficient (η/N) are in balance, in this case, the effective ionization coefficient ( 0   ) equal to zero (Láska et al, 1984;Li et al, 2012).…”

Section: The Transport Parametersmentioning

confidence: 99%

“…Electrical breakdown voltage and critical field strengths (E/N) crt. were calculated at condition that reduced ionization coefficient (α/N) and reduced attachment coefficient (η/N) are in equilibrium, therefore the effective ionization coefficient equal to zero ( = (α/N)-(η/N) =0), this method was used by (Láska et al, 1984;Brand and Kopainsky, 1979;Itoh et al, 1980; to calculate electrical breakdown voltage using two-term approximation solution of Boltzmann equation. Critical field strength have been studied by both theoretical calculations (Tanaka, 2004;Rong et al, 2014;Zhao and Lin, 2016; and experimentally to find new gases with high dielectric field strength which used in electrical insulator, for example, experimentally (Xiao et al, 2018) reported that small addition of oxygen O 2 reduced breakdown voltage of the c-C 4 F 8 /N 2 mixed gas.…”

Section: Introductionmentioning

confidence: 99%

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Boltzmann equation studies on electron swarm parameters for oxygen plasma by using electron collision cross – sections

2020

ZJPAS

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The Boltzmann transport equation has been solved using a two-term approximation method in pure electronegative gas oxygen to evaluate the electron energy distribution function (EEDF) and electron transport parameters for a wide range of E/N varying from 0.1 to 1000 Td (1 Td=10-17 V.cm 2). These parameters, are "electron drift velocity, mean electron energy, characteristic energy, diffusion coefficients, electron mobility, attachment and ionization coefficients, effective ionization coefficient and critical reduced electric field strength (E/N) crt ".. The dependence of second kind collision (super-elastic collision) and electron energy distribution function on E/N are explained (where E is electric field and N is neutral number density). The present calculated results are in good agreements as compared, with the previous experimental and theoretical results. A group of electron/molecule collision (elastic and inelastic) cross-sections are collected for oxygen gas to evaluate transport parameters over the entire E/N range. In addition, the energy lost by different types of electron/molecule collision processes are computed as a function of E/N.

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“…The dielectric breakdown voltage and density reduced critical electric field strength (E/N) cr. of carbon dioxide and its mixtures was calculated at which the balancing electron generation and electron loss are in equilibrium derived from Boltzmann transport equation, this method was used by (Brand & Kopainsky, 1979;Itoh, Shimozuma, & Tagashira, 1980;Laska, Mašek, Krasa, & Peřina, 1984;Hu Zhao et al, 2017). The critical reduced electric field strength (E/N) cr and breakdown voltage for pure CO 2 and mixtures were analyzed theoretically and experimentally by several authors.…”

Section: Introductionmentioning

confidence: 99%

Transport Parameters and Dielectric Strength of Electrical Discharges in an Arc Discharges in Carbon Dioxide Gas

2020

ZJPAS

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The two-term approximation solution of Boltzmann equation analysis has been used to calculate the electron energy distribution function (EEDF), dielectric strength and the electron swarm parameters in carbon dioxide. The electron swarm parameters have been calculated over the wide range of reduced density electric field strength E/N varying from 0.1 to 1000 Td ( 1Td= 10 -17 V.cm 2 ). These parameters, namely electron drift velocity, mean electron energy, electron temperature, characteristic energy, transverse diffusion coefficient, electron mobility, reduced ionization and attachment Townsend coefficients have been compared with the available previous theoretical and experimental results. The values of the critical reduced electric field strength (E/N) cr from the curves of reduced effective ionization coefficient (α-η)/N are calculated. In addition, excitation rate and fractional power transfer to elastic and inelastic collisions are explained.

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Dielectric properties of SF6 mixtures containing oxygen and other gases

Cited by 13 publications

References 21 publications

Decomposition characteristics of SF₆ under partial discharges with point-to-plane electrode defect

Decomposition characteristics of SF₆ under partial discharges with point-to-plane electrode defect

Boltzmann equation studies on electron swarm parameters for oxygen plasma by using electron collision cross – sections

Transport Parameters and Dielectric Strength of Electrical Discharges in an Arc Discharges in Carbon Dioxide Gas

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Dielectric properties of SF6 mixtures containing oxygen and other gases

Cited by 13 publications

References 21 publications

Decomposition characteristics of SF6 under partial discharges with point-to-plane electrode defect

Decomposition characteristics of SF6 under partial discharges with point-to-plane electrode defect

Boltzmann equation studies on electron swarm parameters for oxygen plasma by using electron collision cross – sections

Transport Parameters and Dielectric Strength of Electrical Discharges in an Arc Discharges in Carbon Dioxide Gas

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Decomposition characteristics of SF₆ under partial discharges with point-to-plane electrode defect

Decomposition characteristics of SF₆ under partial discharges with point-to-plane electrode defect