Abstract：Intermittent arc is an important process in the initial development stage of cable fault. This paper takes 10kV XLPE cable widely used in China's distribution network as the research object. Through experimental analysis, it is found that there are obvious waveform differences between the arc inside the cable and the arc breakdown to the ground, and it presents a variety of waveform forms in its development process. This paper combs and summarizes the commonness in the random evolution of the intermittent cable arc, and summarizes them into three main forms: oscillating intermittent arc, steady-state intermittent arc and semi-steady-state intermittent arc. From the perspective of external characteristic reproduction to help cable fault analysis, the control models of three main arc forms are constructed based on Gaussian random pulse, arc gap energy balance theory and proportion control respectively with the idea of black box modeling. The distribution range of the control parameters of each model is calculated according to the experimental sample data. The proposed model is realized by PSCAD simulation software, and the comparison with the experimental waveform shows that the multi-form arc model constructed in this paper can effectively simulate the main characteristics of the three types of intermittent arc. The discovery of the multi-form intermittent arc enriches the random diversity of cable arc, and the arc model provides a new basis for cable incipient fault analysis.
2022, Vol. 37 
