Basic principle induction:
Current (I) flowing through electrical conductor
generates magnetic field all around it. For example, 230 power
lines:
If the communication cable located inside the mag-
netic field electrical conductor, interference
voltage can induced. The energy level
is lower than the case the 10/350 pulse. with lightning
current, can assumed that the frequency will be
high and the pulse duration short. The magnitude the interfer-
ence voltage induced the communication cable de-
pends both the conductor the magnetic field,
and the structure the communication cable. electrical
conductor formed into loop and placed vari-
able magnetic field, voltage (U) can measured at
the ends the conductor.
Data cable
Energy cable
Power
Frequency
Time
Inductive coupling from parallel power cable
Current-carrying conductor
Conductor loop with voltage U
Variable magnetic field
Induction surface
Induction conductor loop
TBS
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Chapter The internal lightning protection system
.
However, not only lightning current that can in-
duce interference voltages; any electrical cable carry-
ing current can this. The magnitude the in-
duced voltage varies depending the size the
magnetic field and the conductor loop inside the
magnetic field. data cable, this
often results the destruction the sensitive elec-
tronic components connected it. A
shield the communication cable can considerably
reduce the magnitude the interference induced. The induced surge
voltages have the waveform 8/20 μs.TBS
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This induces surge voltage that can disrupt dam-
age connected electrical devices
