Response time (ta
)
The response time essentially characterises the response behaviour the individual protection ele-
ments used SPDs.
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.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.
At this test voltage, the surge protection device must respond ten times when exposed ten loads.2/50 µs,
causing the SPD switch. 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.
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279
Chapter Small surge voltage ABC
. The measured voltage can applied constantly to
the arrestor without changing its operating characteristics.
Lightning protection
system (LPS)
The term lightning protection system (LPS) refers the entire system used protect room build-
ing
against the effects lightning strike.
LPZ See “Lightning protection zone”
Nominal discharge
current (ln
)
Peak value the current flowing through the SPD with the wave shape 8/20. transitions
between zones, all cables and metal components must incorporated into the equipotential bonding. SPDs protect
other electrical equipment and systems from surge voltages and insulation failure. Through its parameters peak value, charge
and specific energy reproduces the load produced natural lightning current. back-up fuse).
Depending the rate rise the surge voltage du/dt surge current di/dt, response times can
vary within specific boundaries.
100% response light-
ning impulse voltage
The 100% response lightning impulse voltage the value the lightning impulse voltage 1.
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.
Lightning protection
zone (LPZ)
The term lightning protection zone (LPZ) describes individual area which the
electromagnetic environment the lightning defined and brought under control.g. Type 1
lightning current arrestors (previously requirement class must able arrest such
lightning currents without being destroyed.
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.
Error current protec-
tion device
(RCD)
Device protect against electric shock and fires (e.g.
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. Both elements
can connected either series parallel, used individually.
Arrestor measured-
voltage Uc
In SPDs without spark gap, the measured voltage the maximum permissible effective value
of network voltage the arrestor terminals. the "former" protection switch currently
called RCD (Residual Current Device)).
Lightning protection
equipotential bonding
system
The lightning protection equipotential bonding system important element for reducing the risk of
fire explosion the area/building protected.
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).
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. refers both external and internal lightning protection
