An Efficient Way to Calculate the Conducted Environment with the Consideration of Radiated Distribution

High-altitude Electromagnetic Pulse (HEMP) could induce very fast transient pulse on the transmission line or antenna connected with electrical devices. The conducted environment parameters in IEC 61000-2-10 which is used as a guideline for pulse current injection (PCI) of these devices is available by the statistical calculation of all field-to-line couplings. Even all incidence angles and polarization are listed in the calculation above, the incidence field in the calculation is a standard waveform from IEC 61000-2-9 (with rise time of 2.5 ns, pulse width of 23 ns and amplitude of 50 kV/m). In real situation, peak value, rise time and pulse width of radiated field has a variation distribution on the earth's surface depending on the dip angle and height of burst (HOB). However, high calculation cost (hour level) for radiated field is impossible to calculate conducted environment under the consideration of radiated distribution (10
⁵
times calculation is required). In this paper, a new method with the combination of Polynomial Chaos (PC) and neural network is used here to make it possible to calculate the conducted environment parameters efficiently. Polynomial Chaos by transferring the uncertainty of field-to-line coupling into the coefficients of polynomial could reduce the total number of calculation and neural network method based on published experimental data speeds up the time cost of the calculation of radiated field distribution from hour level to second level. The numerical result shows that the conducted environment parameters with the consideration of radiated distribution is much more different from IEC 61000-2-10 hence we may need to calculate the specific parameters for the PCI test with different electrical devices.