Current and Voltage Induced on Telecommunication Cables by a Lightning Stroke

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Abstract
The telecommunication network behaves as very long interconnected antennas on which the disturbing electromagnetic fields induce currents in a wide frequency range. Most of the disturbing sources induce either a very low current amplitude or the coupling to the inner conductors becomes negligible, due to the transfer impedance of the shielded lines. However high energy surges due to lightning discharges can produce lasting effects on electronic equipment connected at the ends of the telecommunication line. In this paper, we determine the current and voltage which can be induced on the line due to a lightning stroke in order to optimize the protecting devices, and more precisely, we emphasize the relative importance of the coupling to the horizontal and to the vertical part of the line. Since the model must be applied whatever the distance between the ground strike point and the line, and also whatever the ground conductivity, we first describe the various approximations which can be used to get an efficient numerical code to determine the electromagnetic field radiated by a cloud to ground discharge.

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