Investigation on the Influencing Factors of Arcing Time for Secondary Arcs

When the single-phase grounding fault is removed due to interruptions in circuit breakers, a secondary arc emerges and continues to burn, which weakens the continuity and stability of electrical power supplies. Therefore, analyses of the influencing factors of the arcing time are necessary to find suppression technologies for secondary arcs. Scatter plots of the arcing time as a function of the relevant parameters for each experiment are plotted to determine the distribution rule for the scattered points. In addition, the correlation coefficients between the arcing time and the relevant parameters are calculated through statistical correlation algorithm processing. Finally, multivariate fitting is performed between the arcing time and the relevant parameters, and a function is obtained from the fitting for testing. The results show that the arc length and secondary current are significantly positively correlated with the arcing time, while the maximum recovery voltage is significantly negatively correlated. However, the arc area and diameter have little correlation with the arcing time. The proposed method not only provides theoretical support and suppression measures for secondary arcs but can also be applied as an effective means to improve the continuity and security of electrical power supplies.