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
121
Chapter The external lightning protection system
.
• contrast standard shielded medium-voltage
cables with metallic shield, insulated conductors
possess weakly conductive jacket for field con-
trol, de-energising the high voltage the area of
the supply point.
• After the first potential connection the cable
jacket, the insulated conductor secures the spe-
cified equivalent separation distance. Due the heterogeneous electrical fields, local
peaks field strength occur which, when the incep-
tion voltage for creeping discharge reached, trigger
discharge along the surface the conducts.
Structure the high-voltage-resistant OBO isCon®
insulated conductors
The isCon® conductor single wire cable with a
coaxial structure. This prevents the creeping discharges that
would otherwise occur. This therefore prevents arcing via
the cable jacketing the insulated conductor. consists several layers con-
ductive, slightly conductive and insulating material,
and the internal conductor with corresponding con-
ductivity. Thanks this structure, both sufficient
dielectric strength the insulation case lightning
voltage impulses and targeted manipulation the
electrical field strength both ends the cable is
possible.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
isCon®
= insulated conductor
Protective jacket, EVA (ethylene vinyl acetate copoly-
mer), UV-resistant
Conductive PEX (cross-linked polyethylene)
Insulating PEX (cross-linked polyethylene)
35 mm² copper cable
Structure the high-voltage-resistant OBO isCon® insulated conductor
OBO isCon®
system
Insulated conductors are used the field external
lightning protection reduce avoid the separation
distance according IEC 62305.
Creeping discharges always occurs boundary sur-
faces between solid and gaseous insulating mater-
ial
