The surge voltages are simulated with
test impulses, typically with the pulse shape
8/20 μs.2.TBS
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3. The protection devices must be
used before residual current protective device
(RCD), would otherwise interpret the arrested
surge current residual current and interrupt the
power circuit.
TBS
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185
Chapter The internal lightning protection system
. The connection effected paral-
lel the external lines the energy network. The dir-
ect lightning strike simulated with test impulses of
up 100 with the pulse shape 10/350 μs.
Surge arrestor type 2
Surge arrestors type 2/class are used main
and sub-distributors. These surge voltages occur
primarily between the phase (L) and the neutral cable
(N).
Lightning arrestor type and combination arrestor
type 1+2
Lightning arrestors type 1/class are used the
entry the building. protect sensitive controllers, the protec-
tion level must below 1,500 V.2/50 and 8/20 μs. Combination arrestors,
which fulfil the type class (class and the type 2
class (class II), must also fulfil the requirements for
test pulses the pulse form 8/20 µs. protect sensitive control-
lers, the protection level must below 1,500 A
surge voltage protection concept must take account
of all electrically conductive connections and must be
structured levels.2 Type classes surge protection devices
In accordance with IEC 61643-11, OBO SPDs (surge
protection devices) are divided into three type classes
– type type and type (classes and III). Thanks this protection circuit,
transverse voltages are arrested without the residual
current device (RCD) interpreting the surge current as
a residual current and interrupting the power circuit.
These standards contain regulations, requirements
and tests for surge protection devices used net-
works with nominal voltages 1,000 and
nominal frequencies between and Hz. The circuit protects the and lines with varis-
tor circuits and makes the connection the line
through spark gap. The
protection level must below 4,000 Following
consultation with the local energy provider and ac-
cordance with the VDN Directive, use before the main
meter device also possible.
Surge arrestor type 3
Type 3/class III surge arrestors are used protect
against inductive coupling and switching surges the
device power circuits.3.
The surge voltages are simulated with hybrid test im-
pulses and with the pulse shape
1. Each protection level builds on
the one before and reduces the energy content of
the surge
