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Anonymous Poster #1

Advanced Lightning Protection System

02/27/2017 4:09 AM

Hi,

How 80 metre of radius is established? The following is an excerpt from a BoQ.

80 m at level 3, Protection radius Rp(m) = 80 meter Early Streamer Emission Lightning tip (stainless steel 470x60/590x120) , Mast for Lightning Arrestor, 75 sq. mm copper strip bar without any joint in middle of the span from Lightning tip to separate Earth Station.

Regards,

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Guru
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#1

Re: Advanced Lightning Protection System

02/27/2017 1:34 PM

This helpful guide will help explain things and offer solutions.

Dehn Lightning Protection Guide

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#2
In reply to #1

Re: Advanced Lightning Protection System

02/28/2017 8:24 AM

At 80M, you're into the rolling sphere 160M in diameter, running around on the ground

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Anonymous Poster #1
#3
In reply to #2

Re: Advanced Lightning Protection System

03/28/2017 9:18 PM

how is this diameter of 160 m running around the ground? How is the boundary of protection defined?

Regards,

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Guru
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#4
In reply to #3

Re: Advanced Lightning Protection System

03/28/2017 11:10 PM

See the link in post #1 for an explanation (with pictures).

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#5
In reply to #3

Re: Advanced Lightning Protection System

03/29/2017 10:57 AM

Lightning can strike with equal probability anywhere on the surface of this sphere, where the surface touches some object.

So if your 160M sphere touches only earth, clear all around, the highest probability is that the lightning will go to earth. If some object above the ground touches the surface of the sphere, wherever you put it, lightning has equal probability of striking that object or ground.

If some object is below the higher object above, then it has a lower probability of being struck by lightning, so the upper object is a shield for the lower object.

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