Method of pulse function fitting based on the corona current measurement data

As an important gas discharge form, corona discharge can generate electromagnetic radiation field which will interfere with the electronic devices and systems. Calculation of electromagnetic radiation field requires quantitative research of corona pulse current and analytical expression. According to the research situation abroad that the corona current was fitted using double-exponential function and Gaussian function, a corona pulse current function is proposed in the paper. It is researched based on the physical processes of corona discharge current excitation. And the fitting parameters and analytic of -60 kV negative corona discharge current are deduced based on the measurement data and compared with the double-exponential fitting result. The result shows that time derivative at zero time of fitting expression corona current pulse function is zero. And the waveform frontier is consistent with the measured waveform, which is better than double-exponential function. The proposed fitting method is suitable for describing the corona discharge pulse current waveform.