In Article " Design Calculations of Lightning Protection Systems – Part Two ", I indicated the lightning protection design process involves a number of design steps as in Fig.1.
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Step#1: Characteristics of the Structure to Be Protected
Explained in above Article
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Step#2: Risk Assessment Study
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Also, In above Article, I indicated that:
Methods Of Calculations For Risk Assessment Study
The risk assessment study can be done by (4) different methods as follows:
1- Manual Method (equations and tables method),which will be explained as per:
2-Software Method,
3- Excel Sheets Method,
4-Online Calculators Method.
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First: Manual Method (Equations And Tables Method) as per IEC 62305-2
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The Manual Method (Equations and Tables Method) for Calculations of Risk Assessment Study as per IEC 62305-2 can be reviewed in the following Articles:
First: Manual Method (Equations And Tables Method) as per NFPA 780
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The Manual Method (Equations and Tables Method) for Calculations of Risk Assessment Study as per IEC 62305-2 can be reviewed in the following Articles:
As we see in the previous Articles
of the First Method: Manual Method (Equations and Tables Method) that the Manual Method is
time-consuming and not always easy to apply the procedures and data given.
Hence, most of the
lightning designers use various types of software to perform the Risk Assessment Study. I
will explain some of these software programs which are:
Today, I will explain the first software: Strike Risk V5.0 as
follows.
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I explained the first software: StrikeRisk V5.0 in Article " Design Calculations of Lightning Protection Systems – Part Ten ".
Today, I will explain the Second software: RAPAL for performing the Risk Assessment Study: Software Method.
For more information, please review the following Articles:
RAPAL Software
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Second: The Construction Of RAPAL
Software
This program consists of (7) main
windows which are:
Notes:
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1- Structure's Dimensions Window
This
window divided to (2) sub-windows as follows:
1.1
Basic Structure Sub-window
In
this sub-window, select the type of the basic structure from the following
types:
Where:
Also
in this sub-window, answer the question: Does an adjacent structure exist?
1.2
Adjacent Structure Sub-window
Note:
this sub-window will appear only if you select yes as answer for the
question: Does an adjacent structure exist? In above Basic Structure
Sub-window.
In
this sub-window, select the type of the adjacent structure from the following
types:
Where:
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2- Structure's Attributes Window
In this
window, we have (3) boxes, each box represent a different parameter as
follows:
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3- Environmental Influences Window
In
this window, we have (4) boxes, some of these boxes represent different
parameters as follows:
Box#4:
Selection of factor Ng
Select
factor Ng to be calculated from the following:
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4- Conductive Electric Service Lines
This
window includes (4) sub-windows as follows:
4.1
Power Line 1 Sub-Window
This
sub-window include some boxes which differ according to your selection from:
This
is shown in the below table:
Note:
If
you select “None” from box#1, no additional data is required then click next
to go to the next sub-window.
Also
in this sub-window, answer the question: Does an additional power line exist?
4.2
Power Line 2 Sub-window
The
same as in 5.1 Power Line 1 Sub-window, the only difference is in the name of
the following parameters:
Note:
The
sub-window Power Line 2 will not ask you for existing of additional power
line (max. number of permitted power lines =2).
4.3
Telecommunication Line Sub-Window
Same
as Power Line 1 Sub-Window except there is no question for additional lines.
4.4
Other Services Sub-Window
Move
the sliding bar to select the appropriate number of other services.
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5- Protection Measure Window
This
window includes (5) boxes as follows:
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6- Type of Loss Window
This
window includes (4) sub-windows as follows:
6.1
Type 1- Loss of Human Life Sub-Window
This
sub-window includes (4) boxes as follows:
6.2
Type 2- Loss of Essential Public Service Sub-Window
This
sub-window includes (2) boxes as follows:
6.3
Type 3- Loss of Cultural Heritage Sub-Window
This
sub-window includes one box as follows:
6.4
Type 4- Economic Loss Sub-Window
This
sub-window includes (5) boxes as follows:
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7- Results Window
This
window includes (3) sub-windows as follows:
7.1
Calculated Parameters Sub-Window
This
sub-window includes (2) boxes as follows:
7.2
Calculated Risks for Structure Sub-Window
This
sub-window includes (4) boxes as follows:
7.3
Calculated Risks for Services Sub-Window
This
sub-window includes (3) boxes as follows:
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Third: End/Exit RAPAL Software?
When
all the calculated risk results become within limits of tolerable risk in the
two sub-windows calculated risks for structure and calculated risks for
services, so you can click exit to end the program season.
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To download your copy of RAPAL Software Program, please click on the link.
Note:
Non-registered members in
Electrical-Knowhow website will not be able to open and use this excel
spreadsheet.
To register as a member
of Electrical-Knowhow website, do the following:
Notes for downloading our files:
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In the next Article, I will explain Other Software for performing the Risk Assessment Study. Please, keep following.
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