Beginning with the secured operating field strengths
for the long-time range, the following image
shows extrapolation the field strength for the
short-time range few 100 ns. During the expected lifespan lightning
protection system, insulated, high-voltage-resistant
conductor must withstand multiple lightning events.
For this reason, the insulating material can used up
to close the limit the theoretical resistance of
250 kV/mm [Ushakov]. doing, the cross-section the copper
conductor selected such way that sufficient
lightning current carrying capacity and acceptable
flexibility for routing are given, but, the same time,
the standard specifications from IEC/EN 62305-3 are
fulfilled.2. However, this assumes the
use high-quality materials for the internal and ex-
ternal conductive layer, the insulating material and for
the resistive field control. The properties the materi-
als are checked high-voltage test.5 Technical solution for insulated high-
voltage-resistant conductor
The insulation material not constantly subject to
voltage, meaning that aging processes not play a
role medium and high-voltage cables the power
supply.
Electrical field strength kV/mm
Load period s
Sample from type guide
Theoretical limit according Ushakov
Ed extrapolated
Ed secured experimentally, Hz
TBS
Blitzschutz-Leitfaden
2018
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en
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135
Chapter The external lightning protection system
.TBS
Blitzschutz-Leitfaden
2018
/
en
/
2020/01/10
14:42:40
14:42:40
(LLExport_02613)
/
2020/01/10
14:42:54
14:42:54
2. From the type tests carried out, the
field strengths effective the test can calculated
and are shown points the image.13. They match the
theoretical field strength. The extrapolation
covers the theoretical field strength given Ushakov
for the short-time range 250 kV/mm for the time
range 100 ns.
Overview the electrical field strength for insulation ma-
terials high-voltage cables and extrapolated values for
the short-time range, well two protected values
from type tests insulated conductors.
The below image shows finished and patented
design insulated, high-voltage-resistant con-
ductor
