V wiring
Surge protection devices can alternatively connec-
ted shape. Assumption: per m
For the dynamic voltage drop (Udyn), the following
equation applies:
Udyn (di/dt) L
Udyn 0.01 Ohm (10 kA/8 μs) μH
Udyn 100 1,250 1,350 V
Udyn
Voltage drop the cable
i Surge current
R Ohmic line resistance
di/dt current change/Δ time
L Inductance cable (assumption: µH/m)
The dynamic voltage drop Udyn calculated the
basis the product the inductive component and
the change current over time (di/dt).Voltage drop the supply line when surge current applied lightning current, Utotal
= surge voltage protec-
tion device)
Account must taken the lengths the connec-
tion cables. These transi-
ent surges are several high. this case, separate branch
cables are used for connecting the protection devices.
Protective conductor rail
Main equipotential busbar
V wiring
TBS
Blitzschutz-Leitfaden
2018
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en
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2020/01/10
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2020/01/10
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Chapter The internal lightning protection system
. Due the inductance rapid increases
in current (100–200 kA/μs) result large voltage in-
creases
