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lightning stroke (LS)

Lightning in nature is a spark discharge between clouds or between clouds and earth. A distinction is therefore made between cloud lightning and earth lightning. Field strengths of several million volts per meter are required to trigger a lightning strike. Very large electric field strengths build up in a thunderstorm cell. For a discharge to occur, the field strength must exceed the dielectric strength of the air at one point.

During the lightning discharge, a lightning channel forms for a short time, in which a temperature of several tens of thousands of degrees Celsius is created, resulting in overpressure. When the overpressure is equalized, thunder is produced.

Lightning is an extremely brief energy pulse with a duration of a few millionths of a second. The current peaks at a maximum of several hundred kiloamperes (kA), usually 20 kA. To prevent lightning from causing damage to buildings and equipment, it is caught in air-termination systems and discharged into the ground in lightning protection systems. When lightning strikes a building, the surges that occur can exceed 1 megavolt (MV). Lightning current has thermal, dynamic, chemical, and acoustic effects.

Lightning strikes can also functionally impair or destroy data networks, network components and information technology equipment. The high pulse current of lightning creates magnetic fields with the shortest rise times, which induce high longitudinal voltages and transverse voltages in the networks. This presupposes that the cabling is protected by lightning protection component

Englisch: lightning stroke - LS
Updated at: 05.02.2015
#Words: 235
Links: cloud, lightning, meter (m), trigger, field
Translations: DE

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