The most common MV/LV radial distribution systems applied in buildings
In many cases, power is supplied by the power utility to a building at the utilization voltage. In these cases, the distribution of power within the building is achieved through the use of a simple radial distribution system. In cases… Read more
Aug 12, 2019 | By Edvard Csanyi
Top five software types that LV design engineers MUST know how to work with
Back in the early days, engineers weren’t able to use software tools for the purpose of drawing, calculation, and design. So, how did they do it? Prior to the software era, drawings were made manually, using ink and paper, while…...
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Aug 08, 2019 | By Miodrag Kokotovic
The essentials of designing MV/LV single line diagrams (symbols & drawings analysis)
First of all, power system designers should always communicate their design requirements through a combination of drawings, schedules and technical specifications. One of the key tools in developing and documenting an electrical power system is the Single Line Diagram (shortened… Read more
Jul 29, 2019 | By Edvard Csanyi
Practical tips for installing surge protection devices in low voltage panel
In an electrical systems, surge protection devices (SPDs) are usually installed in tap-off configuration (in parallel) between the live conductors and the earth. The operating principle of SPD can be similar to that of a circuit breaker. In normal use… Read more
Jul 08, 2019 | By Edvard Csanyi
How harmonic filters prevent distortions in networks with high harmonic levels
The subject of this technical article are harmonic filters and their design. Filtering measures are recommended and may be required for electrical systems with too high harmonic levels. Filter circuits can absorb more harmonic currents. This means that, like reactor-protected… Read more
Jul 03, 2019 | By Edvard Csanyi
The most important precautions during commissioning and start up of LV switchgear
Low voltage switchgear can often be a very complex and expensive piece of electrical equipment, usually representing one of the most critical and crucial parts of the project. In order to ensure that such important equipment is designed and will…...
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Jun 13, 2019 | By Miodrag Kokotovic
Major components you can spot while looking at opened LV and MV switchboards
Depending on the size of the building or factory site and whether the supply is high voltage or low voltage, there may be requirements for both a main high voltage switchboard and one or more low voltage switchboards or just…...
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Jun 10, 2019 | By Edvard Csanyi
Fire behaviour and construction safety precautions for installation of cables and conductors
Although the type of cable and conductor is the determining factor in the fire behaviour of ducts and conduits, the choice of cable tray type and the installation of the latter in line with installation precautions are just as crucial…. Read more
Jun 05, 2019 | By Edvard Csanyi
Eight common mistakes in reading and creating single line and wiring diagrams
In order to create a consistent and technically correct single line or wiring diagram, more than basic knowledge about the engineering field in question is required. Besides electrical installation and equipment, the design engineers should be familiar with electrical symbols…...
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May 30, 2019 | By Miodrag Kokotovic
Three most important routine tests for successful verification of a low voltage switchgear
Individual tests or routine verifications are intended to check the essential safety aspects of LV assemblies that could be affected by hazards during mounting or possible manufacturing faults. In principle, they must be carried out on all assemblies, either in… Read more
May 08, 2019 | By Edvard Csanyi
How to make calculation for a distribution substation 10/0.4 kV, 2×1600 kVA
Distribution substations with an installed power of 2×1600 kVA are a typical example of electrical power supply facilities which can be often seen all around Europe and wider. By “calculation” of such a substation, it is assumed that values of…...
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May 02, 2019 | By Miodrag Kokotovic
Learn to read and understand single line diagrams and wiring diagrams
Single line diagrams are used in common engineering practice as graphical representation of electrical switchboard or assembly containing more sections, i.e. cubicles. Basically, they are simplified and digest picture of whole switchboard, showing only major power equipment and connections to…...
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Apr 12, 2019 | By Miodrag Kokotovic
Properly engineered and installed selective coordination between LV circuit breakers
It’s extremely important to work on selective coordination of circuit breakers in the design phase of a system. After switchboards, distribution panels, MCCs, lighting switchboards, etc. are installed, there typically is little that can be done to retroactively “fix” a… Read more
Apr 10, 2019 | By Edvard Csanyi
The essence of LV circuit breakers – Releases, tripping curves, characteristics and limitation
A circuit breaker is both a circuit-breaking device that can make, withstand and break currents whose intensity is at most equal to its rated current (In), and a protection device that can automatically break overcurrents which generally occur following faults… Read more
Dec 17, 2018 | By Edvard Csanyi
Neutral earthing systems of generator sets (gensets)
Generator sets have specific features that must be taken into account for protection against electric shocks. Mobile sets cannot be connected to earth and their connection by means of a flexible cable can be easily damaged. In general, generator sets… Read more
Nov 08, 2018 | By Edvard Csanyi