The
main function of the lightning protection system installed on the
existing building is to capture a lightning stroke and then conduct
discharge current safety to the ground.
In
some conditions, however the active lightning system is the only
possible method to protect from direct lightning strokes. Due to the
arguments mentioned above, we recommend to use the active lightning
protection whenever the conventional solution is inconvenient or when
the former is more preferable to the latter as in the case of the
efficient protection of architect.
The lightning discharge is
initiated by so-called down conductor which creates an ionised air path
(downwards or upwards) between the cloud and the ground for the
necessary flow of any lightning currents.
Operating Principle:
Principally,
Schirtec-DA operates with the same technology like Schirtec-A, but
Schirtec-DA has 2 operational parts. The first part is identical with
the Schirtec-A. (technical information is written on its data
sheet).The second part is an additional ion generator located in the
down part of the body. This second ion generator is coated with a
special material in order to protect the circuit from some
environmental effects like corrosion, moisture etc.
The second ion
generator has a different working method, so-called triggering arc. The
triggering arc only occurs when the ambient electric field is high
enough to ensure a stable upward leader can be developed to
successfully intercept the downward leader. With the help of the second
ion generator, Schirtec-DA provides usually a higher ΔT value than
Schirtec-A.
Installation:
Schirtec
-DA should be installed 2 meters higher up than the highest point of
the protected structure. The protection level is depended on the height
at which air terminal is installed and on its power and min.3 meters
from medium and high voltage installations. It should be connected with
down conductors lying on opposite structure walls.
|
DOWN CONDUCTORS |
|
Material |
Minimum Dimensions |
| Bare or tin-plated Electrolytic Copper |
Strip 30 x 2 mm
Round Section : 8 mm dia
Braided cable 30 x 3,5 mm |
| 18 / 10-304 Stainless Steel |
Strip 30 x 2 mm
Round Section : 8 mm dia |
| A 5/L Aluminium |
Strip 30 x 3 mm
Round Section : 10 mm dia |
It is required an earth resistance less than 10 ohm.
A Lightning Strike Counter can be installed at the down conductor to count the flows of the lightning current.
Schirtec E.S.E. Conductors Features:
*possibility
of protection of large and complex structures through only one point
with the active air terminal installed on the top which makes the
system easy to install.
*device completely ecological and non-radioactive
*no outside power source, device completely autonomous
*weather-proof device
*no moving parts
*dynamic response to the approach of a lightning downward leader
|
SCHIRTEC-DA E.S.E. LIGHTNING CONDUCTOR |
|
Ref. |
Description |
ΔT:Acc. to
NFC 17-102 |
Test Report of
SCHIRTEC-DA |
Material |
Size
(cm) |
Weight
(kg) |
|
S-DA |
E.S.E. Type Lightning Rod with Double Ion Generators
ΔT:60µs |
60µs |
75µs |
Stainless Steel |
70x12 |
App.
4.2 |
Notes: Schirtec-DA is testable with the external test device (SA-1T TESTER).
SCHIRTEC-DA