7. The greater the
risk lightning strike and the likely damage, the
more effective must the design the lightning pro-
tection system.3 Estimation the damage risk
The damage risk assessed using the lightning
threat data and the possible damage.
1.
Lightning thread data:
• Frequency lightning strikes region
• Equivalent interception area
Possible damage:
• Injury death people
• Unacceptable failure services
• Loss irreplaceable cultural treasures
• Financial loss
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46
Chapter General introduction
.L
4000m
AI
HJ
ADJ
LJ
WJ
L
40m AL
H
L
W
AD
3H
500m
AM
Length the building structure
Width the building structure
Height the building structure
Equivalent interception area the building structure
Equivalent interception area couplings due electro-
magnetic effect (building)
Equivalent interception area supply lines
Equivalent interception area couplings due electro-
magnetic effect (line)
Equivalent interception area for indirect lightning strikes
The equivalent interception area for indirect lightning
strikes circle with radius 500 around the
base the building and area extending 2,000 m
either side the supply line
