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A lot of work had been made in the vacuum arc in power frequency. But there are few research reports about high-frequency vacuum arc. In this paper, the arc appearance and development process have been studied under 250 kHz. A compact resistance-inductance-capacitance (RLC) series resonant circuit was designed to generate high-frequency vacuum arc between plate electrodes in a detachable vacuum chamber...
The residual axial magnetic field (AMF) at current zero, which is caused by large di/dt during the forced current-zero stage of DC interruption based on the technique of artificial current zero, has significant influence on the interruption performance of the vacuum circuit breaker. In this paper, a model of AMF contacts is developed by finite-element-analysis software, Ansys. The eddy current induced...
In this paper, a method is proposed to simulate the two-dimensional random motion of a single cathode spot step by step. Simulation parameters, e.g., the characteristic displacement and time step of random motion, are taken from relevant experimental data. In every motion step, the moving direction along the x axis (+x or −x) and y axis (+y or −y) are chose randomly, and the displacements along the...
The motion of cathode spots plays a crucial important role in removing oxide layer on metal surface by vacuum arc. In this paper, the characteristics of a single cathode spot motion were investigated experimentally. Experiments were conducted in a detachable vacuum chamber. A hollow copper anode with a hole of 10×10mm was used in order to observe the two-dimensional motion of cathode spot. The motion...
This paper presents a computational study of point-to-plane atmospheric helium plasma discharge. We employed a two-dimensional, axisymmetric fluid model to investigate the time-dependent characters of the discharge. Helium with small amount of nitrogen (impurity) was used as the working gas. The gap distance between the two electrodes was varied from 1mm to 15mm. The magnitude of the applied voltage's...
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