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Characterization of the lightning wave

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General rules of electrical installation design
Connection to the MV utility distribution network
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MV and LV architecture selection guide for buildings
LV Distribution
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LV switchgear: functions and selection
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PhotoVoltaic (PV) installation
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ElectroMagnetic Compatibility (EMC)
Measurement

Analysis of the phenomena allows definition of the types of lightning current and voltage waves.

  • 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);

Fig. J910/350 µs current wave

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

Fig. J108/20 µs current wave

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.

  • The overvoltages created by lightning strokes are characterized by a 1.2/50 µs voltage wave (see Fig. J11).

This type of voltage wave is used to verify equipment's withstand to overvoltages of atmospheric origin (impulse voltage as per IEC 61000-4-5).

Fig. J111.2/50 µs voltage wave