The field medium and high-voltage technology has
shown that floating discharges can occur the ends
of cables.
However, the transition the insulated conductor in
the critical area the building edge and connection
of the insulated conductor the air-termination sys-
tem require special additional measures avoid float-
ing discharges.13. The same problems must solved for
the insulated conductor. However, there the differ-
ence that there never alternating current insu-
lated conductor and only few voltage and current
loads will occur during the entire lifespan struc-
ture.
An insulated conductor, shown the image below,
can developed, if, instead the air around the
bare conductors being used the insulating material,
it assumed that the bare conductor surrounded
by virtual solid insulating material.2. first
glance, this allows routing the insulated cable dir-
ectly the shell the structure. Due the in-
creased resistance solid insulating material com-
pared air, the insulation thickness around the con-
ductor can reduced few millimetres.2. The requirements for special potential control for
insulated conductors lightning protection are de-
rived from this.
Structure
Lightning channel
Insulated air-termination device
Insulator
Conventional conductor
L Separation distance
U Induced voltage
Structure
Virtual solid insulation material
Structure
Virtual solid insulation material
replaced with insulated con-
ductor
Critical area
Development insulated, high-voltage-resistant conductor
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
132
Chapter The external lightning protection system
.3 Isolated external lightning protection sys-
tem with insulated, high-voltage-resistant conduct-
ors
A high-voltage-resistant, insulated conductor should
withstand the induced voltage the event light-
ning strike and resist the environmental loads, such as
ultraviolet radiation and soiling, the tension and pres-
sure forces resulting from snow, ice and wind, well
as the electrodynamic forces. these applications, avoid floating dis-
charges, the cable given cable termination for po-
tential control
