The Effect of an Ocean-Land Mixed Propagation Path on the Lightning Electromagnetic Fields and Their Induced Voltages on Overhead Lines


We have a tendency to use a full-wave approach based mostly on the finite-component methodology solution to Maxwell's equations for the evaluation of the result of an ocean-land mixed propagation path on the on top of-ground lightning electromagnetic fields and their induced voltages on overhead lines. 2 cases of normal and oblique strikes are studied. For normal strike, it is shown that neither the vertical electrical field nor the azimuthal magnetic field is suffering from the thought-about mixed propagation path. For an oblique strike, but, the azimuthal magnetic field is slightly affected when the observation point is close to the ocean-land interface (i.e., 5 m or thus), while the vertical electric field remains unchanged. For both traditional and oblique strikes, at moderate and way distances from the channel base and when the observation purpose is found in the vicinity of the ocean-land interface, the radial electric field is markedly suffering from this interface. For the calculation of lightning-induced voltages, two cases, particularly, the ocean-aspect and therefore the river-crossing transmission lines are studied. For the ocean-side transmission line, as the overhead line gets closer to the ocean, the induced voltages on the line midpoint decrease whereas increasing behavior is observed within the voltages induced on the line terminations. For the river-crossing transmission line, the lightning-induced voltages along the line experience a vital modification in terms of their peak values and waveshapes. In some cases, the enhancement in induced voltages can be as high as a factor of 2 with respect to that obtained by assuming a homogeneous propagation path characterized by the electrical properties of the land.

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