IEEE ICHVE 2022 / 1-PAGE ABSTRACT

FDTD Simulation of Charge-Voltage characteristics of Corona under Impulse Voltages

KANG Zhuofan*¹, HE Huiwen², WANG Lei², ZHANG Shimin¹, HUANG Yubin¹, HE Hengxin¹

(1.State Key Laboratory of Advanced Electromagnetic Engineering and Technology, Huazhong University of Science and Technology, Wuhan, China, 430074

2. Wuhan Branch of China Electric Power Research Institute, Wuhan, China, 430074)

koto1958@qq.com



Purpose/Aim

A thin conductor corona model which can consider the influence of non-uniform electric field on corona and is suitable for multi-conductor system is established to calculate the lightning overvoltage waveform and propagation process.

Experimental/Modeling methods

The model is based on FDTD method and streamer discharge theory. FDTD discretizes the Maxwell equation in the whole calculation area, specifies the electrical parameters for each grid, and then iterates the equation for calculation.

Results/discussion

The simulation of charge-voltage characteristics of the thin wire in coaxial corona cage is carried out, and the influence of the measured capacitance on charge-voltage characteristics is analyzed. The figures show the charge-voltage characteristics.

Conclusions

The influence of corona conductivity on charge-voltage characteristics is analyzed. It is concluded that the conductivity for positive corona is 100 μS/m is in good agreement with the experimental results in the literature. In addition, the existence of measured capacitance has a great impact on the measurement of charge-voltage characteristics. The charge-voltage  characteristics measured by corona cage under a specific condition cannot be extrapolated to the real transmission line.