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2018
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2. However, insulators are a
part mechanically coupled system made in-
sulating materials and ladders.2 Insulated external lightning protection sys-
tem with insulators
An insulator should keep conductors routing lightning
current distance from metallic structures and elec-
trical systems, provide insulation against the induced
voltage case lightning strike and resist the en-
vironmental loads, such ultraviolet radiation and
soiling, and the tension and pressure forces resulting
from snow, ice and wind. specifies the ratio the standing
lightning pulse voltages air spark gap and in-
sulator aged radiation.
kx leff/lst Effective length correction factor
leff Strike distance air spark gap with equivalent
discharge behaviour insulator. Instead km, the manufacturer states the ef-
fective length correction factor kx, which confirmed
in type test. The separation distance defined DIN
EN 62305-3 (IEC 62305-3) and contains the coeffi-
cient km.2.
The most important requirement the compliance of
the necessary separation distance, even the insulat-
or moved.13.
Stand
Insulator
Metal bracket
Air-termination system/conductor
Insulated holder
lst
Thread measure the insulator
Definition thread measure the insulator
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
131
Chapter The external lightning protection system
.
lst Thread measure the insulator
Further type tests are described IEC 62561-8
and contain the following points:
• Documentation
• Labelling
• Construction
• Ultraviolet light
• Corrosion
• Extraction force
• Bend test
• Impact test
• Electrical testing
The following applies for the calcu-
lation the separation distance
according IEC/EN 62305-3:
km
= kx
