Dependence of polarity effect of dielectric breakdown on molecular structure of liquids

Yoshino, Katsumi; Ohseko, K.; Shiraishi, M.; Terauchi, M.; Inuishi, Yoshio

doi:10.1016/0304-3886(82)90099-7

Cited by 12 publications

(7 citation statements)

References 6 publications

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“…Moreover, above a certain stress level, 300 kV/cm according to [31], particle activity may stop because of either an ejection of impurities from the gap or an adhesion to the electrode surfaces. The influence of impurities also depends on the molecular structure of the liquid [32], as foreign particles can be attracted into the gap and form a bridge distorting the electric field between the electrodes [7]. An improvement in breakdown strength can be achieved by increasing the number of filtering cycles of the oil.…”

Section: The Effect Of Impuritiesmentioning

confidence: 99%

A Short Review of Some of the Factors Affecting the Breakdown Strength of Insulating Oil for Power Transformers

Danikas

Sarathi

Morsalin

2020

Eng. Technol. Appl. Sci. Res.

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The present short review investigates some of the factors affecting the breakdown strength of transformer oil. Factors such as the conditioning effect, effect of oil flow, influence of impurities, type of applied voltage and electrode configuration and geometry are further discussed. It should be noted that this review does not discuss the effect of factors such as area, volume and capacitance. Velocity, impurities, electrodes’ shape and the type of applied voltage are among the factors documented to have a significant effect on breakdown strength.

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Section: The Effect Of Impuritiesmentioning

confidence: 99%

A Short Review of Some of the Factors Affecting the Breakdown Strength of Insulating Oil for Power Transformers

Danikas

Sarathi

Morsalin

2020

Eng. Technol. Appl. Sci. Res.

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“…Near the triple point of a liquid S(0) ≈ 0.05 for Ar, Kr and Xe. For larger energies S(ε) increases and becomes close to unity for ε > (3)(4) eV [12]. When the field strength exceeds 10 6 V cm −1 , the electron mean energy attains a value of a few eV.…”

Section: Treatment Of the Experimental Datamentioning

confidence: 99%

“…Since the first direct observation of electron ionization avalanche in liquid Xe [1], indirect measurements of impact ionization have been carried out [2][3][4][5]. It has been shown that the process of collision ionization of atoms by hot electrons (e.g.…”

Section: Introductionmentioning

confidence: 99%

Ionization phenomenon in high-density gaseous and liquid argon in corona discharge experiments

Bonifaci

Denat

Atrazhev

1997

J. Phys. D: Appl. Phys.

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Experimental investigations of corona discharge in Ar for a wide region of fluid density from a rare gas up to a liquid have been carried out. Corona current has been observed for a point cathode voltage above the threshold value . Values of have been measured for a wide range of fluid density N and for different cathode radii . The obtained dependences of on N and have been analysed using the Townsend - Meek breakdown criterion. For low-density gas the calculations of have been carried out by using universal data on ionization coefficient . The data of for low-density gas are in good agreement with these calculations. Deviation from the `gaseous' dependence has been obtained in measurements carried out with a continuous increasing of the fluid density. The onset corona voltage in dense supercritical gas and in liquid is appreciably smaller than the values calculated from the gaseous Paschen curve. To explain this disagreement a model of impact ionization in liquid was developed. An assumption was made that inelastic energy losses of fast electrons by excitation of atoms without their ionization are absent in liquid. The expression for the ionization coefficient in liquid Ar has been obtained and it was used for calculation of in liquid. The calculated values are in agreement with the experimental data obtained in liquid Ar.

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“…A pressure dependence is also seen for measurements made with AC power by Fallou et al 73 and pulsed power by Yoshino et al. 75 Altogether, these observations of the pressure dependence may be interpreted as related to gas discharge within a vapour bubble, and we will revisit this point in Sec. IV F. At 1.7 K and between ∼10 and 600 Torr, we observed a factor of approximately 2.5 increase in the mean breakdown field for the MP datasets as shown in Fig.…”

Section: Pressure and Temperature Dependencementioning

confidence: 61%

A study of DC electrical breakdown in liquid helium through analysis of the empirical breakdown field distributions

Phan,

Wei,

Beaumont

et al. 2020

Preprint

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We report results from a study on electrical breakdown in liquid helium using near-uniform-field stainless steel electrodes with a stressed area of ∼0.725 cm 2 . The distribution of the breakdown field is obtained for temperatures between 1.7 K and 4.0 K, pressures between the saturated vapor pressure and 626 Torr, and with electrodes of different surface polishes. A data-based approach for determining the electrode-surfacearea scaling of the breakdown field is presented. The dependence of the breakdown probability on the field strength as extracted from the breakdown field distribution data is used to show that breakdown is a surface phenomenon closely correlated with Fowler-Nordheim field emission from asperities on the cathode. We show that the results from this analysis provides an explanation for the supposed electrode gap-size effect and also allows for a determination of the breakdown-field distribution for arbitrary shaped electrodes. Most importantly, the analysis method presented in this work can be extended to other noble liquids to explore the dependencies for electrical breakdown in those media.1 Ref. 7 reports measurements at 0.4 K

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Dependence of polarity effect of dielectric breakdown on molecular structure of liquids

Cited by 12 publications

References 6 publications

A Short Review of Some of the Factors Affecting the Breakdown Strength of Insulating Oil for Power Transformers

A Short Review of Some of the Factors Affecting the Breakdown Strength of Insulating Oil for Power Transformers

Ionization phenomenon in high-density gaseous and liquid argon in corona discharge experiments

A study of DC electrical breakdown in liquid helium through analysis of the empirical breakdown field distributions

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