In order to study arcing characteristics

we established a semi-empirical mathematical model of arc combustion.First

we calculated the pre-arcing time of the fuse through ANSYS finite element software; analyzed and simplified the physical process of the arc combustion

and established the external circuit models for melt ablation

quartz Sand ablation

heat exchange between arc and quartz sand

and arc voltage.Secondly

the results were calculated by MATLAB

and the calculated current and voltage curves were fitted with the experimental curve. Thirdly

the arc-related physical property parameters were determined

and the curve of electrical conductivity with temperature was introduced during the arcing process. Finally

a fuse with rated 1 200 V/1 250 A was taken as the research object based on the model to analyze the influences of arc ignition process and melt structure size on the arc voltage peak value and zero crossing time. The simulation and experimental results show that

with the increase of width and pitch length

the peak value of arc pressure of melt increases and the zero crossing time decreases; when the total length of melt remains at a fixed value

the variation of fracture number and pitch length has a negligible effect on the arc characteristics. The peak arc voltage of the melt should be controlled within 3 times of the rated voltage

and the zero crossing time should be taken as the safety protection margin.