Numerical Modeling of Space–Time Characteristics of Plasma Initialization in a Secondary Arc

Abstract

A numerical model based on the finite element simulation software COMSOL was developed to investigate the secondary arc that can limit the success of single-phase auto-reclosure solutions to the single-phase-to-ground fault. Partial differential equations accounting for variation of densities of charge particles (electrons, positive and negative ions) were coupled with Poisson’s equation to consider the effects of space and surface charges on the electric field. An experiment platform was established to verify the numerical model. The brightness distribution of the experimental short-circuit arc was basically consistent with the predicted distribution of electron density, demonstrating that the simulation was effective. Furthermore, the model was used to assess the particle density distribution, electric field variation, and time dependence of ion reactions during the short-circuit discharge. Results showed that the ion concentration was higher than the initial level after the short-circuit discharge, which is an important reason for inducing the subsequent secondary arc. The intensity of the spatial electric field was obviously affected by the high-voltage electrode at the end regions, and the intermediate region was mainly affected by the particle reaction. The time correspondence between the detachment reaction and the ion source generated in the short-circuit discharge process was basically consistent, and the detachment reactions were mainly concentrated in the middle area and near the negative electrode. The research elucidates the relevant plasma process of the secondary arc and will contribute to the suppression of it.

Improvement of circuit oscillation generated by underwater high voltage pulse discharges based on pulse power thyristor

“…In figure 5, V in is the external DC voltage, which was set to 15 000 V, and in the external RC series circuit, R and C were set to 120 Ω and 8.1 μF, respectively. In order to make the initial environment universal, the electron density value in the simulation domain is set to 10 13 m −3 with reference to many studies [17,33,34], and the electron density variation during the electrode breakdown process was shown in figure 6.…”

Influence of Arc Size on the Ignition and Flame Propagation of Cable Fire

“…The arc resistance is estimated at 20.7 kΩ. A typical "zero break" phenomenon of arc current is observed [28][29][30][31][32][33].…”

“…The arc resistance is estimated at 20.7 kΩ. A typical "zero break" phenomenon of arc current is observed [28][29][30][31][32][33]. Typical voltage and current waveforms of the arc are shown in Figure 3.…”