1 Risk humans
When lightning hits buildings, trees even the
ground itself, the lightning current enters the ground
and so-called potential funnel forms.
Out the open, crouching position provides protec-
tion against direct lightning impact. buildings fitted with lightning protection sys-
tems, the lightning current causes voltage drop at
the earthing resistance. More and more frequently, today's
electronic aids are damaged surge voltages
caused remote lightning discharges switching
operations large electrical systems. the ground near the building, step
voltages pose further risk. Data networks companies or
emergency facilities such hospitals and fire stations
are lifelines for essential real time information ex-
change.
It not only lightning strikes that pose latent threat
to these systems. During thunder-
storms too, high volumes energy are instantan-
eously released. person touches the
lightning protection system, they are risk harm
due the large contact voltage. banks media
publishers, need reliable transmission paths.
Step voltage and potential funnel formed when lightning strikes
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13
Chapter General introduction
. These voltage peaks can penetrate a
building though all manner conductive connections
and cause enormous damage.
Step voltage Us
Potential gradient area
Close the point strike/beside the down-conductor,
the step voltage (1) high.
1. The difference potential produces step
voltage that puts people and animals risk electric
shock.2 Risks posed by
lightning discharges
Our dependency electrical and electronic equip-
ment continues increase, both our professional
and private lives.g. The greater the
distance from the point where the current enters the
ground, the lower the electrical potential the
ground.
The step voltage decreases with distance away from
the point lightning impact. All metal components and
on the building must connected with the equipoten-
tial bonding system rule out the risk high contact
voltages. Sensitive databases, e.TBS
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1.2
