Characterization of the lightning wave: Difference between revisions
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Analysis of the phenomena allows definition of the types of lightning current and voltage waves. | 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: | *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 {{FigRef|J9}}); | |||
{{FigImage|DB422469|svg|J9|10/350 µs current wave}} | |||
:* 8/20 µs wave: to characterize the current waves from an indirect lightning stroke (see {{FigRef|J10}}). | |||
{{FigImage|DB422470|svg|J10|8/20 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 {{FigRef|J11}}). | *'''The overvoltages '''created by lightning strokes are characterized by a 1.2/50 µs voltage wave (see {{FigRef|J11}}). | ||
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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). | 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). | ||
{{FigImage|DB422471|svg|J11|1.2/50 µs voltage wave}} | |||
Latest revision as of 17:50, 20 December 2019
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. J9 – 10/350 µs current wave
- 8/20 µs wave: to characterize the current waves from an indirect lightning stroke (see Fig. J10).
Fig. J10 – 8/20 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. J11 – 1.2/50 µs voltage wave
