CALCULATION OF THE INDUCED CURRENT IN A TEST COIL BY A HIGH POWER ELECTROMAGNETIC PULSE

This work deals with an issue of great importance, related to the possible destructive effects of a high power electromagnetic pulse – as the lightning pulse – upon electronic equipments in its area of influence. Lightning pulse characteristics are presented for type 2 / 50, one of the most common, where the number 2 mean length of the front and number 50 - the average duration of current pulse, in microseconds.

It is calculated, based on specific linear antenna’s relationships, electromagnetic field components caused by the lightning current pulse, both in the close area - the field of induction, and in the far area - the radiation field. Based on these is calculated the induced power density and its corresponding energy in a test coil, located at 100 m from the point of lightning strike, and are compared the values obtained with maximum allowed energy levels of different components and electronic devices; the comparative analysis serves to draw useful conclusions about the need of using anti-disturbance protection for these equipments.