Effects of high-altitude electromagnetic pulse on overhead pipeline

摘要

High-altitude electromagnetic pulse may cause damage to electronic equipments through coupling pipeline system. In order to study the effects of high-altitude electromagnetic pulse on overhead pipeline, the electromagnetic field-to-overhead pipeline coupling equations are derived from Maxwell's equations. The coupling equations are solved in frequency domain by applying the Green's functions, and the time-domain waveforms of induced currents and voltages are obtained by using inverse Fourier transform. The currents and voltages at both ends and in the middle of pipeline are calculated by MATLAB software. It is shown that the peak values of the currents along the pipeline don't vary much. The voltages at the ends of the pipeline are larger and the voltage polarity at one end is opposite to another, while the voltages in the middle of the pipeline are smaller. The effects of system characteristics on induced voltages are presented, such as the length of the pipeline, the height of the pipeline, the radius of outer surface of the pipeline and the conductivity of the ground. The results of these studies are applicable to electromagnetic pulse protection.