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Thus, measures avoid floating discharges can be
selected without taking thermal effects alternating
current into account. The weakly
conductive layer attached this insulating material. contrast the medium and high-
voltage network, the inductive coupling, created the
lightning impulse current, induces very high voltage
onto the cable shield.
The two conduction layers compensate for uneven-
nesses, thus ensuring even field distribution. This
avoids the formation damaging floating discharges
through the appropriate control the electrical field
strength the critical area the transition the air-
termination system. turn, this voltage requires the
maintenance separation distance between the
shield and the system protected. resistive field control has
shown itself particularly suitable and robust.
Here, manner similar medium and high-voltage
cables, the internal conductor surrounded with a
weakly conductive internal conduction layer, which
the actual insulating material attached.
However, the metallic shield used for medium and
high-voltage cables technically undesirable for insu-
lated conductors. Undershooting
this separation distance would lead arcing and to
the coupling high impulse current into the sys-
tems protected [Beierl].
Lightning current, several kA
Connections between copper cable and sheath
Electrical connection building, conductive structure,
local PAS
Minimum spacing (smaller values are possible based
on calculation)
Function the isCon®
conductor
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133
Chapter The external lightning protection system
