) that are routed into the
building. Suitable test currents for testing different
lightning and surge protectors have been defined in
national and international standards.
The area under the current-time curve for surge cur-
rents indicates the amount charge. Type lightning current arresters
and external lightning protection components are
tested using this pulse. The charge of
the lightning test current waveform 10/350 roughly
corresponds times the charge surge current
of waveform 8/20 with the same amplitude. building with external lightning protection
receives direct hit, voltage drop occurs the
earthing resistance the lightning protection equipo-
tential bonding system, which represents surge
voltage against the distant environment.4 Test currents and simulated
surge voltages
High lightning currents can flow the ground during
a storm.
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21
Chapter General introduction
.
This rise potential poses threat the electrical
systems (e.
Remote lightning strikes switching operations:
Pulse shape 2
The surges created remote lightning strikes and
switching operations are imitated with test impulse
8/20 μs. The energy content this impulse signific-
antly lower than the lightning test current surge cur-
rent wave 10/350 μs. voltage supply, telephone systems,
cable TV, control cables, etc.
Example:
• Lightning current (i): 100 kA
• Earthing resistance (R): Ω
• Voltage drop (u):
R 100 100,000 V
Conclusion:
The voltage between the earthing resistance and the
remotely earthed network increases 100 kV.g. Surge arresters type and
type are impacted with this test impulse.
Direct lightning strike: Pulse shape 1
Lightning currents that can occur during direct light-
ning strike can imitated with the surge current of
waveform 10/350 μs. The lightning test current imit-
ates both the fast rise and the high energy content of
natural lightning.TBS
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2018
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Pulse shape Direct lightning strike, 10/350 simu-
lated lightning pulse
Pulse shape Remote lightning strike switching op-
eration, 8/20 simulated current pulse (surge voltage)
Types pulse and their characteristics
1
