Numerical investigation on transient arc characteristics and anode surface temperature considering the electrode movement

Yang, Ze; Wang, Lijun; Zhang, Zhefeng; Chen, Jieli; Gortschakow, Sergey

doi:10.1088/1361-6463/ac84ea

Cited by 7 publications

(1 citation statement)

References 21 publications

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“…In other words, electrons are ionized by impacting with neutral particles in this region after being accelerated by the electric field in the space charge layer. [79] According to this analysis, the thickness of the space charge layer is about 0.017 mm, the thickness of the pre-sheath layer is about 0.078 mm, and the thickness of the two layers is independent of the arc current.…”

Section: Effect Of Different Current Levels On the Near-cathode Sheat...mentioning

confidence: 87%

Fluid-chemical modeling of the near-cathode sheath formation process in a high current broken in DC air circuit breaker

Peng

Duan

et al. 2023

Chinese Phys. B

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When the contacts of medium-voltage DC air circuit breaker (DCCB) are separated, the energy distribution of arc is determined by the formation process of near electrode sheath. So, the voltage drop through the near electrode sheath is an important means to build-up the arc voltage, which determines the current-limiting performance of the DCCB directly. A numerical model describing the near electrode sheath formation process can provide insight into the physical mechanism of the arc formation and thus provide a method for arc energy regulation. In this work, a two-dimensional axisymmetric time-varying model of a medium-voltage DCCB arc when high-current interrupted was established based on a fluidchemical model involving 16 kinds of species and 47 collision reactions. The transient distributions of electron number density, positive and negative ion number density, net space charge density, axial electric field, axial potential between electrodes and near cathode sheath were obtained from the numerical model. The computational results show that the electron density in the arc column increases, then decreases, and then stabilizes during the near cathode sheath formation process, and the arc column diameter gradually becomes wider. The 11.14–12.33 V drops along the 17 µm space charge layer away from the cathode (65.5–72.5 kV/m) when the current is verying from 20–80 kA. The homogeneous external magnetic field has little effect on the distribution of particles in the near cathode sheath core, but the electron number density at the near cathode sheath periphery can increase with the magnetic field increasing and the homogeneous external magnetic field will lead to arc diffusion. The validity of the numerical model can be proved by comparison with the experiment.

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Section: Effect Of Different Current Levels On the Near-cathode Sheat...mentioning

confidence: 87%

Fluid-chemical modeling of the near-cathode sheath formation process in a high current broken in DC air circuit breaker

Peng

Duan

et al. 2023

Chinese Phys. B

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Experiment and simulation of generation of highly charged ions in a pulsed vacuum arc

Nikolaev

Окс

et al. 2023

Vacuum

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Effect of contact materials on the transient characteristics of vacuum arc plasma and anode erosion

YANG 杨,

CAI 蔡,

HUANG 黄

et al. 2024

Plasma Sci. Technol.

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In this study, mechanisms of the anode phenomena and anode erosion with various contact materials were investigated. Arc parameters were calculated, and the anode temperature was predicted with a transient self-consistent model. The simulation results predicted a constricted arc column and obvious anode phenomena in Cu–Cr alloy contacts than in W–Cu alloy contacts. This observation could be the reason for concentrated anode erosion in Cu–Cr alloys. For the contacts made by pure tungsten and W–Cu alloy, the anode temperature increased rapidly because of the low specific heat of tungsten. However, the maximum energy flux from the arc column to the anode surface was lower than in other cases. The simulation results were compared with experimental results.

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Numerical investigation on transient arc characteristics and anode surface temperature considering the electrode movement

Cited by 7 publications

References 21 publications

Fluid-chemical modeling of the near-cathode sheath formation process in a high current broken in DC air circuit breaker

Fluid-chemical modeling of the near-cathode sheath formation process in a high current broken in DC air circuit breaker

Experiment and simulation of generation of highly charged ions in a pulsed vacuum arc

Effect of contact materials on the transient characteristics of vacuum arc plasma and anode erosion

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