Arrester is the most effective measure to prevent lightning over-voltage. One of the most widely used arrester type is zinc oxide arrester. Resistive current is an important basis for judging the health status of zinc oxide surge arresters. However

due to partial capacitance interference

the current measuring method is difficult to accurately obtain the resistive current from the total current. Taking the 500 kV Zinc Oxide lightning arrester as an example

the three-phase arrester resistance RC network model modeled by Simulink module in MATLAB

considering the arrester section conditions

taking into account the partial capacitance between the sections and the phase-to-phase capacitance between the phases

can effectively filter out the capacitive component of the total current

calculate the resistive current. The value of the capacitance of each part in the RC network is calculated by using the finite element method in Ansys;The resistance value of the RC network is obtained by the high voltage test. In this paper

the AC high voltage test of 500 kV single section lightning arrester near working voltage was carried out. Without the interference between phases and partial capacitance between the various sections

the resistance current of single-phase surge arresters can be measured directly through the existing measuring instrument. Then obtained the AC resistance by the voltage applied and the resistive current.