g. Both elements
can connected either series parallel, used individually.
Insulation coordination
The insulation and the maximum voltage resistance (insulation resistance) the electrical
system ensured through the use SPD with lower protection level (voltage limit).
Lightning protection
zone (LPZ)
The term lightning protection zone (LPZ) describes individual area which the
electromagnetic environment the lightning defined and brought under control. Type 1
lightning current arrestors (previously requirement class must able arrest such
lightning currents without being destroyed.
Depending the rate rise the surge voltage du/dt surge current di/dt, response times can
vary within specific boundaries.
Lightning surge cur-
rent (Iimp
)
The lightning surge current (lightning current carrying capacity per path) standardised
surge current curve with the waveform 10/350 μs.
Short-circuit resistance
The surge protection device must able conduct the short-circuit current, until either
interrupted the device itself internal external cut-off unit the
mains-side over-current protection (e.
Volume resistance per
path, series resistance
The volume resistance per path the ohmic resistance increase per wire produced the
use the surge voltage protection device.
Error current protec-
tion device
(RCD)
Device protect against electric shock and fires (e. back-up fuse).
At this test voltage, the surge protection device must respond ten times when exposed ten loads.
Response time (ta
)
The response time essentially characterises the response behaviour the individual protection ele-
ments used SPDs.2/50 µs,
causing the SPD switch. the "former" protection switch currently
called RCD (Residual Current Device)).
The lightning protection equipotential bonding produced using equipotential bonding cables SPDs
that connect the external lightning protection system,
metal components the building space, installations; extraneous conductive parts and the electrical
energy and telecommunication systems, with each other.TBS
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Chapter Brief glossary surge protection
Term Standard text
Arrestor
(SPD= surge protect-
ive device)
Arrestors (in the standard surge protection devices (SPD))
consist voltage-dependent resistors and/or spark gaps.
LPZ See “Lightning protection zone”
Nominal discharge
current (ln
)
Peak value the current flowing through the SPD with the wave shape 8/20.
Arrestor measured-
voltage Uc
In SPDs without spark gap, the measured voltage the maximum permissible effective value
of network voltage the arrestor terminals.
Cut-off unit
The cut-off unit cuts the SPD off from the mains/earthing system case overloading, prevent a
risk fire
while the same time signalling that the protection device has been switched off.
100% response light-
ning impulse voltage
The 100% response lightning impulse voltage the value the lightning impulse voltage 1.
Lightning protection
system (LPS)
The term lightning protection system (LPS) refers the entire system used protect room build-
ing
against the effects lightning strike. Through its parameters peak value, charge
and specific energy reproduces the load produced natural lightning current. SPDs protect
other electrical equipment and systems from surge voltages and insulation failure.g. used classify the
testing of
surge arrestors type (formerly requirements Class C)
Nominal frequency (fn
) The nominal frequency the frequency device given the manufacturer for normal operation. refers both external and internal lightning protection. transitions
between zones, all cables and metal components must incorporated into the equipotential bonding.
Lightning protection
equipotential bonding
system
The lightning protection equipotential bonding system important element for reducing the risk of
fire explosion the area/building protected.
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279
Chapter Small surge voltage ABC
. The measured voltage can applied constantly to
the arrestor without changing its operating characteristics
