Page 16 - Reliable_System_Solutions

insulating pipe with
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HVI conductor
in the hazardous area

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insulating pipe with HVI conductor
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HVI conductor
at a cell site mast HVI conductor in the
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insulating pipe
isolated air-
termination rod Part No. 819 320
with tripod support
telescopic lightning
protection mast
DEHNiso distance holder
isolated air-termination rod
with concrete base
DEHNiso Combi

=
head piece

head piece head piece
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DEHNconductor system HVI conductor –
durable, universal, tried and tested.
sealing unit sealing unit sealing unit
area area area
High impulse voltages cause flashovers at the surface of insulating via an equipotential bonding connection element. The black
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materials if no additional protection measures are taken. This coaxial HVI conductor with an outer diameter of 20 mm and
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effect is known as creeping flashover. If the creeping discharge the grey coaxial HVI conductor with an outer diameter of 23
2
inception voltage is exceeded, a surface discharge occurs which mm consist of a 19 mm copper wire, a thick-walled, high-voltage
can range over a distance of several metres without any problems. resistant insulation and a weatherproof special external coating.
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In order to avoid creeping discharges, the HVI conductor is In order to prevent low-energy flashovers due to capacitive EB connection
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equipped with a special external coating which allows for displacement currents, the HVI conductor can be additionally element (fixed)
diverting high lightning impulse voltages to a reference potential. connected to the equipotential bonding structure during EB connection EB connection
In the sealing unit area, the external special coating is connected conductor installation. These connections do not have to be element (fixed) element (fixed)
to the equipotential bonding structure of the building where capable of carrying lightning currents as the capacitive
no parts of the lightning current flow, e.g. at earthed metal displacement currents have low energy and do not cause
roof superstructures in the protection zone of the lightning dangerous sparking. Extensive measurements show that the
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protection system, at earthed parts of the building construction HVI conductor with its high electric strength has an equivalent HVI conductor sealing unit HVI conductor
which are free of lightning currents or at the protective conductor separation distance of s = 0.75 m (air). with special area with special
of the low-voltage system. Under certain conditions, the special coating coating
coating can be connected to parts of the lightning protection heat-shrinkable
system such as air-termination system and other down-conductors. sleeve (not fixed)
For this purpose, it has to be ensured that the calculated
separation distance does not exceed 35 cm in air at the contact earth connection element
(not fixed)
point. In this case, the special external coating has to be directly
connected to the part through which lightning potential flows
EB connection element
earth (not fixed)
connection
element (not
fixed) head
piece

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HVI conductor I HVI conductor II HVI conductor III HVI conductor and
Part No. 819 020 Part No. 819 024 Part No. 819 022 insulating pipe for
biogas plants
Part No. 819 750

distance holder for insulating
For more technical information, please refer to the Lightning Protection main catalogue 2007 pipes at omnidirectional
as from page 49 and to installation instructions 1566. antennas
Part No. 105 363