TBS
Blitzschutz-Leitfaden
2018
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en
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2020/01/10
14:42:40
14:42:40
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2020/01/10
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134
Chapter The external lightning protection system
.2. Both diagrams show how the nu-
merical, time-discreet field calculation can used to
optimise the resistive field control that the current
in the field control layer can kept small pos-
sible, whilst still avoiding the formation floating dis-
charges.2/50. As
an example, the left image shows the field diagram of
this arrangement with applied impulse voltage of
1,000 the area the equipotential bonding ter-
minal. The lower
the resistance designed be, the more effective it
is. For this, the test-
ing arrangement used basis, which also
used for the high-voltage testing according IEC TS
62561-8 and represents the worst-case scenario.2 the applied impulse voltage 1.13. Within the external conductive layer
and the resistive field control layer, the current lines
can seen, which are significant for avoiding floating
discharges. The right-hand image uses cross-sec-
tion diagram show the current density vectors and
equipotential areas.
Current density vectors resistive field control and po-
tential density insulated conductor time 1.2.
In upward direction, the value given the re-
quirement for effective field control. potential 1,000 is
applied the internal conductor.
Field diagram insulated conductor the first equi-
potential bonding terminal during type test time =
1. an
induced voltage only present insulated con-
ductor when lightning strikes, resistive field control
can used avoid floating discharges.
Here, equipotential lines and the vertical electrical field
lines can seen. Using the numerical field calculation, the res-
istive field controller can calculated time-dis-
creet manner for the entire course the impulse
voltage.
The voltage load lightning strike impulse
voltage.2/50 below
the earthed fastening clamp.4 Potential control
For safe operation insulated conductor, meas-
ures avoid floating discharges are necessary. The value limited downward direction that
no partial lightning current can flow into the building.2
µs the applied impulse voltage 1. This allows optimisation the resistance
value the resistive field controller
