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MeteorCalc SL
MeteorCalc SL is a CAD plugin for designing street lighting networks.
The MeteorCalc SL software implements a full cycle of design works in the electrical
networks of street lighting from determining the optimal configuration of street lighting
networks to drawing schemes of street lighting feeders and obtaining specifications of
equipment.
The MeteorCalc SL performs all required electrical calculations for designing street
lighting installations.
Website: meteorcalc.com
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MeteorCalc SL provides the following main features:
• Calculation of short-circuit currents. The minimum and maximum short-circuit currents
are calculated according to IEC60909 (last edition 2016);
• Calculation of voltage losses in street lighting feeders with an unbalanced load;
• Calculation of power sum and load currents in street lighting feeders with an
unbalanced load;
• Specifications and explications of equipment (poles, luminaries, cables etc.);
• Schemes of street lighting feeders. Automated drawing of detailed single-line
schemes of street lighting feeders;
• Descriptions of street lighting units. Obtaining data tables with descriptions of all used
street lighting units in the drawing;
• Multi language output into the drawing.
MeteorCalc SL main features
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Short-circuit current calculations according to IEC 60909
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The minimum and maximum short-circuit currents are calculated according to IEC 60909
(last edition 2016) for all end points in the street lighting feeders and at the main bus of a
distribution panel boards.
Short-circuit currents are calculated by application of symmetrical components for
balanced and unbalanced circuits according to the IEC 60909.
The symmetrical components method allows to calculate all types of short-circuit currents
at any point in a street lighting feeder with a high degree of accuracy.
Voltage loss calculations at selected end points
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A street lighting feeder is a three-phase electric circuit with unbalanced, distributed loads.
Voltage losses in street lighting feeders with an unbalanced load are calculated for each
phase individually taking into account a voltage loss in the neutral conductor.
The estimated point is located at the end terminals of the feeder cable. Results of
calculations are output in a drawing in the form of result block.
Calculations of power sum and load currents in a street
lighting feeder
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Results of calculations are output in a
drawing in the form of result block. The
calculated load currents in each phase
determine the current capacity of cables and
the nominal current of protective devices.
Load currents in street lighting feeders with an
unbalanced load are calculated for each phase
individually. A current in the neutral conductor is
calculated as the geometric sum of the phase
currents.
The program has calculation process, which is open to
monitoring
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The program has ample opportunities to
control the electrical calculations. Before
starting calculations the user can view and
check initial data of all elements of the
calculation circuit.
Every step of all the electrical calculations
(including interim and auxiliary results) can
be thoroughly checked on the user request .
The user can save a detailed report of the
calculations in an external file. All methods
of electrical calculations are fully described
in the software Help System.
Street lighting units Data Library
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The MeteorCalc SL has fully edited Data
Library. The user edits the street lighting units
Data Library to create equipment and material
types necessary for work, accounting for
regional and national standards and specifics
of the task to solve.
The number of categories is fixed. Within each
category, the user can define any number of
street lighting unit descriptions according to the
needs and tasks to be solved by the user.
The Data Library has the built-in ILCOS
categorizer. The MeteorCalc SL provides total
support of LED luminaires.
Simulation of street lighting units
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A street lighting unit is a block inserted within the
work layer of the program to simulate an
electrical consumer in street lighting networks
(for example, it may be a street lighting pole with
several luminaires or a single pendant luminaire,
etc.).
Certain data from Data Library can be assigned
to a block to define a street lighting unit.
The user can redefine any street lighting unit
blocks from program’s template according to the
regional standards and can add new blocks
according to specifics of the project.
Built-in database of electrical power cables
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The MeteorCalc SL has the fixed database
of electrical power cables.
The cables database is destined to support
actually any electrical power cable types
used in street lighting networks.
The values of cable resistance (up to 1 kV)
at the temperature 20°C are specified
according to either standard IEC 60228 or
manufactures’ data. The reactance values
at frequency 50Hz are specified according
to the standard IEC 60909-2 and
manufactures’ data.
Simulation of street lighting cables
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Street lighting cable spans are simulated with
lightweight polylines. Certain data from Data
Library can be assigned to polylines to define
cables.
The length of each cable span is calculated as
the length of a polyline in a drawing plus the
amount of additional length as input by the user.
For underground cables the "Additional length"
property allows to simulate vertical spans of a
cable. For overhead lines this property allows to
simulate an increase in a cable length because of
a cable sag.
Model of street lighting network
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The street lighting model is a plurality of MeteorCalc SL
objects (blocks and polylines) relating to a street lighting
network. The street lighting model can be located in a
separate dwg-file or can be situated directly in the street
lighting project file as the part of street lighting project.
The MeteorCalc SL enables to create street lighting models
of any level of complexity. There are no restrictions in
quantity of branches in street lighting feeders.
The MeteorCalc SL allows to simulate existing or designed
networks.
A single file may contain several models. The user can
make copies of them for the comparative analysis of
different variants and then choose the optimal solution.
The example, where a street lighting model is located directly in the project file, is shown further.
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Step 1. Creating of the street lighting preliminary project
The user selects luminaires and the
parameters of their installation,
performs the lighting calculations
and defines the distances between
poles.
Special blocks with information
labels are used to simulate street
lighting units on the plan.
If street lighting model is located
directly in a project file, blocks of
street lighting units are the part of a
street lighting plan and, at the same
time, the part of a street lighting
model.
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Step 2. Street lighting model creation
Street lighting cable spans are
simulated with lightweight
polylines. Street lighting units,
transformers and distribution
panel boards are simulated with
blocks.
The MeteorCalc SL has many
commands for a quick insert of
model blocks and for drawing
polylines of street lighting model.
According to model design rules,
a street lighting feeder should
have a correct tree-shaped
structure.
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Step 3. Assigning data to objects. Performing of calculations
The MeteorCalc SL provides
many possibilities for quick data
assignment to objects of a street
lighting model. Data can be
assigned to a single object or to
multiple objects in a feeder.
The MeteorCalc SL performs an
automated numbering of street
lighting units and an automated
distribution by phases.
An analysis of the network
structure and comparison of
different feeder’s configurations
are performed at this stage.
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Step 5. Drawing of single-line schemes
Drawing of accurate and detailed
schemes of street lighting feeders
is very simple with the MeteorCalc
SL. Single-line schemes are
drawn automatically from a feeder
start point to each selected
endpoint.
The calculations of short circuit
currents and voltage losses are
performed at the selected
endpoint while drawing the
diagrams.
Based on the results of the
calculations the user selects the
protective device of a street
lighting feeder.
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Step 6. Specifications, explications and descriptions of units
The MeteorCalc SL allows to
obtain the following specifications
and explications of SL-objects:
street lighting poles, pole
supports, pole foundations,
luminaries, cables, earthing
devices and electrical equipment.
The MeteorCalc SL also allows
creating an external report file
with calculation results. An
external report can be created as
text file or exported to an external
spreadsheet application.
Choice of protective devices
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The main feature of street lighting networks is that street lighting feeders usually have a
considerable length (up to 1000m). That is the reason why the accurate calculations of short-
circuit currents at endpoints of feeders are very important for a verification of the protection of
people against indirect contact.
The calculated short-circuit currents allow to choose the
setting of thresholds for overcurrent protective devices
and fuses and allow to verify disconnection time of
protective devices.
According to the IEC 60364-4-41, the maximum
disconnection time for TN and IT systems with the
nominal voltage 230/400V is 0,2 sec (if a nominal current
not exceeding 32A).
The procedure of choosing a protective device is completely described in the MeteorCalc SL
Help System.
Results
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The final result of the program work - a set of drawings, including a plan of street lighting
installation, a plan-scheme, single-line feeder diagrams, specifications and tables with
information sheets for ordering equipment.
Changing the project is no longer a problem for the user now. The user does the necessary
changes in the street lighting model, and prints the new specifications and updates the
calculations and schemes.
The MeteorCalc SL have more than 35 commands. Convenient program interface is built
according to all stages of the design process of the electric part of street lighting networks.
For this reason the software is very easy to learn.
More information about the MeteorCalc SL (including video tutorials and examples) you may
find on the website meteorcalc.com
Used standards
• IEC 60909-0 (2016): Calculation of short-circuit currents.
• IEC/TR 60909-2 (2008): Data of electrical equipment for short-circuit current calculations.
• IEC 60909-4 (2000): Examples for the calculation of short-circuit currents.
• IEC 60228 Conductors of insulated cables.
• IEC 60287-1-1 (2014): Electric cables - Calculation of the current rating - Part 1-1: Current rating equations (100 % load factor) and calculation of losses - General.
• IEC 60364-4-41 (2007) Low-voltage electrical installations - Part 4-41: Protection for safety - Protection against electric shock.
• IEC 60076-1 (2012) Power transformers - Part 1: General.
• IEC 60947-2 (2006) Low-voltage switchgear and controlgear - Part 2: Circuit-breakers.
• IEC TS 61231 International lamp coding system;
• CEN/TR 13201 Road lighting;
• IEC 60038 IEC standard voltages;
• IEC 60076 – Power transformers;
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Thank You!
Copyright © MeteorOwl Ltd. All rights reserved.
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Note. All used in this presentation trademarks belong to their respective owners.
DWG, Autodesk, the Autodesk logo, AutoCAD is a registered trademark or trademark of Autodesk, Inc., in the USA and other countries. This publication is independent of Autodesk, Inc., and is not authorized by,
endorsed by, sponsored by, affiliated with, or otherwise approved by Autodesk, Inc.
BricsCAD® is commercialized by Bricsys NV. Bricsys NV is a fully owned subsidiary of Menhirs NV. All copyrights are the property of Menhirs NV. BricsCAD is a registered trademark of Bricsys NV.