Non-contact miniature lightning overvoltage sensor

In this paper, a miniature, high voltage-division ratio non-contact sensor system for measuring lightning overvoltage is designed and the high-voltage arm capacitance formed by the coupling between the transmission line and the sensor?s sensing metal plate and the voltage divider capacitance of the sensor constitute a capacitive voltage divider system to get the voltage signal. The capacitance value of the high-voltage arm and the low-voltage arm is calculated by the finite element simulation software and then we analyzed the relationship between the high-voltage arm capacitance and the distance between the sensor and the transmission line. The calibration of the standard lightning signal of 1.2 ?s/50 ?s is carried out to verify the correctness of the simulation analysis of the sensor and meet the requirements of the lightning overvoltage measurement.