Page 21 - Energize January 2021

ADVERTORIAL

DEHNguard with ACI technology:

Safety redefined

DEHN is an innovative, global, family-owned electrotechnical company the service life of the ACI surge arrester, any fault current
with more than 100 years of experience and tradition. The vast is interrupted by the varistor through the switch / spark
product offering has allowed DEHN to expand globally, with products gap combination and reduced to such an extent that not
available in over 70 countries through an extensive partner network, even the smallest fuses in the system are tripped. This
20 subsidiaries and official DEHN offices. offers greater availability and operational safety for the
system in comparison with standard type 2 arresters with
DEHN, the leading authority on surge and lightning protection external fuses.
solutions, launched DEHNguard, now with ACI (Advanced Circuit
Interruption) technology. Temporary overvoltages (TOV), due to loss of neutral, can
destroy conventional surge protective devices. The new ACI
ACI technology is a first in the market and an exclusive product of arresters can withstand TOV much better. Conventional
DEHN. The DEHNguard surge arrester with ACI technology allows arresters have a fail-safe to cater for temporary
users to save valuable space, time and drive down costs. DEHNguard overvoltages, meaning that the unit would need to be
with ACI is a pre-wired, comprehensive unit that consists of a base replaced in case of a temporary overvoltage. ACI technology
part and plug-in protection modules, making installation easier. allows the system to withhold up to 440 Volts without failing.
This further increases the availability of your system and
The system features a switch / spark gap combination which makes saves time and money that would have otherwise been
upstream fuses superfluous. spent on repairs and maintenance.
Any fault or short-circuit current that occurs is immediately conducted DEHNguard with ACI technology also promises zero leakage
into the quenching chamber and interrupted. This means that only current, due to galvanic isolation by the ACI switching unit,
very small currents which have no negative influence on the increasing arrester lifetime. This feature prevents premature
system/application are allowed through. As a backup fuse is no longer ageing of the protective devices and saves the time and
required, you can realise savings in terms of time, space and material. expense of replacing arresters ahead of schedule. ACI
arresters also prevent the accidental tripping of the
Safe dimensioning sets the DEHNguard with ACI technology apart insulation monitoring and contribute towards operational
from the competition; it is truly a ‘no-worries’ package for the user, safety.
eliminating possible configuration errors made when selecting and
dimensioning a suitable backup fuse. The small disconnection integral DEHNguard with ACI technology allows you to reduce
of the ACI switching element allows the use of smaller connection installation complexity, improve system availability and save
cross-sections of ≥ 6 mm2. The system removes a level of you time, space and material costs, all while remaining well-
complexity during installation. equipped for future requirements. n

It is critical to consider
ongoing global progress as
constant availability of
electrical systems is fast
becoming the standard.
Disruptions, as a result of
power cuts and system
failures, are simply not
acceptable. Renewable
power generation is also
creating new grid
parameters – these
isolated grids and storage
systems are changing
short-circuiting conditions.
This is an aspect which the
new ACI technology has
well under control. The
switch / spark gap
combination in DEHNguard
ACI is connected in series
with a varistor. At the end of

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