Estimation of flashover voltage along cylindrical insulator in vacuum

Naruse, Hiroki; Yamamoto, Osamu

doi:10.1109/deiv.2014.6961620

Cited by 7 publications

(3 citation statements)

References 4 publications

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“…The results exhibit that the smooth surfaces acquire more charge than the rough surfaces. These charge distributions can be used for predicting flashover voltages of cylindrical insulators in a vacuum [7].…”

Section: B Applicabilitymentioning

confidence: 99%

Evaluation of a factor for calculating SEEA charge on insulator surface in vacuum

Naruse

Yamamoto

2015

2015 3rd International Conference on Electric Power Equipment – Switching Technology (ICEPE-ST)

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A secondary electron emission avalanche occurring on a surface of an insulator of a bridged gap, along with the resultant charging phenomena of the surface, plays a decisive role in the progress of the flashover in a vacuum. This paper reports a method developed to derive a constant that is necessary for calculating the distribution of charge accumulated on the surface due to the secondary electron emission avalanche based on a calculation and a measurement.

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Section: B Applicabilitymentioning

confidence: 99%

Evaluation of a factor for calculating SEEA charge on insulator surface in vacuum

Naruse

Yamamoto

2015

2015 3rd International Conference on Electric Power Equipment – Switching Technology (ICEPE-ST)

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“…Because some parameters are difficult to acquire in (4), such as the M cr , γ, the simulation can be simplified by the following process: 36 The ratio k can be defined by:…”

Section: Simulation Modelmentioning

confidence: 99%

Enhanced flashover strength in polyethylene nanodielectrics by secondary electron emission modification

Wang

Min

2016

AIP Advances

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This work studies the correlation between secondary electron emission (SEE) characteristics and impulse surface flashover in polyethylene nanodielectrics both theoretically and experimentally, and illustrates the enhancement of flashover voltage in low-density polyethylene (LDPE) through incorporating Al2O3 nanoparticles. SEE characteristics play key roles in surface charging and gas desorption during surface flashover. This work demonstrates that the presence of Al2O3 nanoparticles decreases the SEE coefficient of LDPE and enhances the impact energy at the equilibrium state of surface charging. These changes can be explained by the increase of surface roughness and of surface ionization energy, and the strong interaction between nanoparticles and the polymer dielectric matrix. The surface charge and flashover voltage are calculated according to the secondary electron emission avalanche (SEEA) model, which reveals that the positive surface charges are reduced near the cathode triple point, while the presence of more nanoparticles in high loading samples enhances the gas desorption. Consequently, the surface flashover performance of LDPE/Al2O3 nanodielectrics is improved.

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“…The determination of the surface flashover voltage is a complex issue, since it depends on several factors: the properties of the solid insulating material, the nature of the surrounding gas and its pressure and humidity, as well as various geometrical parameters, such as the shape of the insulator and its adjacent electrodes [2]. Many publications dealing with the theory of surface breakdown [3,4] describe numerical simulations made for understanding the characteristics of various simple insulator geometries [1,2]. Several engineering design criteria, based on semi-empirical rules, were also presented in the literature [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Determination of Breakdown Voltage Along the Surface of a Cylindrical Insulator

Zhabin

Ferron²,

Rivaletto³

et al. 2022

IEEE Trans. Dielect. Electr. Insul.

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This paper investigates the electric breakdown along the surface of a cylindrical dielectric, part of a coaxial transmission line. The particular geometry of the insulator is very common, as it is used at the input or output of most high-power, high voltage generators. The streamer propagation criterion is used to calculate the flashover voltage. Studies of the dependence of the flashover voltage on the distance between the electrodes obtained in tests with DC voltage and also by applying voltage impulses with different durations and rise-times are reported. The highest difference between the estimated values and the experimental data is less than 15%, which proves the applicability of the criterion for determining the surface breakdown voltage within the geometry under study. In particular, the results of these studies are used in the design of a compact 0.5 MV pulsed power system currently under development.

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Estimation of flashover voltage along cylindrical insulator in vacuum

Cited by 7 publications

References 4 publications

Evaluation of a factor for calculating SEEA charge on insulator surface in vacuum

Evaluation of a factor for calculating SEEA charge on insulator surface in vacuum

Enhanced flashover strength in polyethylene nanodielectrics by secondary electron emission modification

Determination of Breakdown Voltage Along the Surface of a Cylindrical Insulator

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