Effect of Discharge Amplitude on Electrical Trees Based on Three-Capacitance Model

The phenomenon of electrical trees in DC cable insulation is the main threat to cable operation. The three-capacitance model is one of the common models used to characterize the internal defect discharge of insulation. In this paper, the equivalent circuit is established based on the three-capacitance model of the electrical tree, and the equivalent circuit is analyzed under different conditions of discharge and discharge, and the influencing factors of the apparent discharge quantity change during the electrical tree process are obtained from the perspective of capacitance, and the finite element simulation software is used to calculate the capacitance directly according to the electrode structure. In this paper, the relationship between the partial discharge amplitude and the distance of the pin plate, and the size of the electric tree during the growth of the electric tree under constant pressure is deduced theoretically.