Characterization of the Lightning Wave Currents

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•(a) Analysis of the phenomena allows definition of the types of lightning current and voltage waves.

•(a) 2 types of current wave are considered by the IEC standards:

  - 10/350 µs wave: to characterize the current waves from a direct lightning stroke (see Fig. J9);

  - 8/20 µs wave: to characterize the current waves from an indirect lightning stroke (see Fig. J10)

•These two types of lightning current wave are used to define tests on SPDs (IEC standard 61643-11) and equipment immunity to lightning currents

•The peak value of the current wave characterizes the intensity of the lightning stroke .

                                                         Fig. J9: 10/350 µs current wave

                                                      Fig. J10: 8/20 µs current wave