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# Series of exercises - Electrotechnical calculations and selection of power cable cross-sections and protective devices

Series of exercises for students is designed to explain the procedure of choosing power cable cross-sections and protective devices in low-voltage (0.4kV) distribution networks.
Rank D3 - MASTER
\$1 · Tallinn · Electrical

## Project Abstract

The delivered dwg-example contains exercises (in the form of network models and diagrams) for electrical engineers and students. All the exercises made in the dwg-file using AutoCAD®. Network models are drawn in Metric system, using power cables from the IEC 60502 standard.

The economically founded choice of cables and protective devices for them is a complex multi-stage procedure. The design of low-voltage distribution networks is based on the calculations of actual load currents, voltage losses and short-circuit currents. All these calculations are very labor intensive and cannot be done by manual calculation.

To solve these problems the designer need to know electrotechnical parameters at all the nodes and in all the lines of the designed network and he should be able to quickly recount them if some characteristic of loads or equipment has been changed.

There are various software tools to perform electrotechnical calculations in low-voltage networks. These lab exercises use free CAD-plugin known as MeteorSpec LT. It allows to make accurate models of low-voltage networks and performs all necessary calculations of load currents, short-circuit currents and voltage losses. Free download on https://meteorspec.com

## List of Deliverables

The delivered dwg-file contains abstract models (models without using real coordinates of network objects) of low-voltage feeders, singe-line diagrams and an pratical example of calculations.

## Tags

#Low-voltage #Distribution #Network #Cables #Fuse #MCB #Transformer #MeteorSpec #Short-circuit #Current