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• W4226440427 abstract "This work investigates the dynamic characteristics of vacuum arc in the initial expansion process of a direct current (dc) circuit breaker. Based on the commercial cup-type axial magnetic field (AMF) contact, a 3-D transient magnetohydrodynamic (MHD) model is established. In the model, transient equations are used to study the transient characteristics of the vacuum arc. The effect of magnetic field hysteresis is also considered in the method. The dynamic mesh technique is adopted to simulate the electrode separation, which can make the simulation results more accurate. The simulation results show that, during the initial expansion process, with the increase in the current, the arc gradually expands in the electrode gap. The ion pressure, ion number density, axial current density, and energy flux density to the anode gradually decrease. Ion rotation can be observed under the influence of the magnetic field, and the rotation speed will increase with the increase in the current. Two different arc ignition positions are also compared. The result shows that igniting the arc at the contact center is more helpful to the success of the interruption of the dc circuit breaker. The appearance of the arc predicted by the model is consistent with the experimental results." @default.
• W4226440427 created "2022-05-05" @default.
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• W4226440427 date "2022-05-01" @default.
• W4226440427 modified "2023-10-05" @default.
• W4226440427 title "3-D Dynamic Simulation of the Initial Expansion Process of Vacuum Arc Plasma in DC Interruption" @default.
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• W4226440427 doi "https://doi.org/10.1109/tps.2022.3165289" @default.
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