This prevents the creeping discharges that
would otherwise occur. 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. consists several layers con-
ductive, slightly conductive and insulating material,
and the internal conductor with corresponding con-
ductivity. This therefore prevents arcing via
the cable jacketing the insulated conductor.
• After the first potential connection the cable
jacket, the insulated conductor secures the spe-
cified equivalent separation distance.
TBS
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121
Chapter The external lightning protection system
.
Creeping discharges always occurs boundary sur-
faces between solid and gaseous insulating mater-
ial.
• 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.
Structure the high-voltage-resistant OBO isCon®
insulated conductors
The isCon® conductor single wire cable with a
coaxial structure.TBS
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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. 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
