In Article " Introduction to Lightning System Design- Part One ", I listed all terms, abbreviations and Symbols used in lightning field.
Also, in Article " Introduction to Lightning System Design- Part Two ", I answered the following questions:
- What is Lightning?
- What are the types of Lightning flashes?
- What is the shape of The Lightning Waveform?
- How Lightning strikes can affect the electrical and/or electronic systems of a building?
- What are the main effects of Lightning?
And in Article " Types Of Lightning Protection Systems LPS ", I list the main types of Lightning Protection Systems as follows:
Types of Lightning Protection Systems LPS
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Types of Lightning Protection Systems LPS
Lightning protection
systems for buildings and installations may be divided into three principal
types as follows:
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1- LPS for Protection for buildings and installations
against direct strike by lightning
This type of LPS protects
the building from damage by direct strike lightning but doesn’t prevent the
lightning striking the building. This type of LPS can be divided into:-
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1.1 Types of Conventional Lightning Protection
System
The Conventional Lightning Protection System includes (2)
different types as follows:
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1.2 Types of Non-Conventional Lightning Protection
System
The Conventional Lightning Protection System includes
(2) different types as follows:
1- Active Attraction
LPS, which includes:
2- Active Prevention/Elimination
LPS, which includes:
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Notes on different Types
of Lightning Protection Systems LPS
Each system’s design
requires the following:
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Today, I will explain the Conventional Lightning Protection System LPS Components.
Conventional Lightning Protection System LPS Components
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Conventional Lightning Protection System LPS Components
The Conventional Lightning Protection System consists of (2) main parts (see Fig.1) :
1- The External Lightning Protection System, which includes:
2- The Internal Lightning Protection System, which includes:
Another important components of the Lightning Protection System is the Connection Components which include but not limited to:
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1- The External Lightning
Protection System
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Functions of External Lightning Protection System
The functions of the
external lightning protection are:
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Components of External
Lightning Protection System
External Lightning
protection systems have (3) distinct subsystems (see Fig.1), They are:
These
individual Subsystems of an external LPS should be connected together using
appropriate lightning protection components (LPC). This will ensure that in
the event of a lightning current discharge to the structure, the correct
design and choice of components will minimize any potential damage.
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1- Strike Termination Subsystem
Usually called "Air Termination
Subsystem", the purpose of the strike termination subsystem is to intercept
the lightning event and course it harmlessly into the conductor subsystem. Thus it is
vitally important to use a correctly designed air termination system.
When
designing the external lightning protection system of a structure, we
distinguish between two types of air-termination system (see Fig.2):
1- Non-Isolated
System:
2- Isolated System:
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Forms of Strike Termination Subsystem
The strike
termination subsystem can take many forms specified by the various engineering standards available (see Fig.3), as follows:
1- Vertical Air Terminals:
2- Horizontal air termination network:
The
horizontal air termination networks have (2) method of installation:
A- Meshed conductor network:
- Meshed
conductor network is installed by (2) ways:
- Meshed
conductor network usually uses bare copper strip (25×3 mm for example) which
will be supported at equal intervals.
- Meshed conductor network can be applied in two
sizes:
(5 m X 10 m) mesh,
(10 m X 20 m) mesh.
The first one is used in
high risk structure such as
explosives factors.
B- Overhead wires (Catenary wires):
One or more
catenary conductors may be utilized to provide a zone of protection over an
entire structure. Catenary (or suspended) conductors, whether they are
supported by free standing masts or linked with conductors to form a mesh on
the roof.
3- Combination of Vertical
Air Terminals and Horizontal air termination network
that is used in important buildings for increasing the protection against Lightning strikes, where Vertical Air Terminals and Horizontal air termination can combined together to consist one Air Termination System.
4- Natural Air Terminals:
Notes:
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In the next Article, I will continue explaining the Conventional Lightning Protection System LPS Components. Please, keep following.
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