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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
Protection against electric shocks and electric fires
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LV switchgear: functions and selection
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Energy Efficiency in electrical distribution
Power Factor Correction
Power harmonics management
Characteristics of particular sources and loads
PhotoVoltaic (PV) installation
Residential and other special locations
ElectroMagnetic Compatibility (EMC)

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