Abstract
The presence of metal particles in power equipment may cause gas discharges and threaten insulation reliability. The discharge phenomenon in the presence of particles involves complex physical processes. To describe these processes, a numerical method is proposed to analyze the relationship between the motion of the particle and the discharge at the same time. First, processes including the generation of the first electron, the formation of a streamer corona, the transition from the streamer to the leader, and the leader propagation are considered. Voltage–time characteristics are calculated with particles of different shapes. Then, the characteristics of the particle motion driven by the Coulomb force are analyzed. Finally, the threshold field for partial discharge and the breakdown in the presence of the particle are discussed taking into account the voltage–time characteristics and the analysis of the particle motion mentioned above. The results demonstrate that there is a threshold field when breakdown occurs in the presence of a long and narrow particle at the negative electrode before the particle leaves the electrode.
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