Energy and Power
Why earth leakage protection is necessary in low voltage installations
We all should know that low voltage circuit breakers and fuses operate in the event of excess current arising from overload conditions and faults. As the statistics say, the most common fault type in LV installations is an earth fault,… Read more
Dec 25, 2019 | By Edvard Csanyi
Low Voltage
Five switching devices you are likely to spot in most of the low voltage switchgear
This technical article will try to shed some light on switching devices usually installed in low voltage switchgear – circuit breakers, contactors, disconnectors, load-break switches, switch disconnectors and fuses. There are many variations of these devices, but the core function… Read more
Dec 23, 2019 | By Edvard Csanyi
Low Voltage
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Where and why you should use thyristor switched reactive power compensation
Various aspects of reactive power compensation problems have already been mentioned in previous articles. However, because of consistency of this article, we will remind ourselves briefly on basic terms and principles related to this field. Reactive power is a sort…...
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Dec 12, 2019 | By Miodrag Kokotovic
Electric Motor
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The wiring diagram and physical layout of the equipment inside the motor control centre
This article will provide a description of the most important equipment and working principle of a real case motor control centre (MCC). That is a usual name for a switchboard with the purpose of power supply and control of induction…...
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Nov 14, 2019 | By Miodrag Kokotovic
Low Voltage
4 electrical quantities you MUST fully understand to select the right cast-resin transformer
This the basic question, but it’s important to start from the scratch. Well, distribution transformers link the MV to the LV system and step down the electrical power to be distributed to the intended low-voltage level (e.g. 400 V/230 V… Read more
Nov 13, 2019 | By Edvard Csanyi
Low Voltage
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13 very important type tests of a low voltage switchgear carried out by the manufacturer
Certification of distribution assemblies is defined by international standard IEC 61439-1. This standard provides common rules that are recognized worldwide. Compliance with the standard is certified, depending on the country or market, by a declaration of the panel builder, the…...
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Nov 06, 2019 | By Edvard Csanyi
Energy and Power
The art of achieving selectivity between incoming feeders connected in parallel
Calculating selectivity between incoming low voltage feeders connected in parallel is never an easy task. In parallel operation of two, three and more transformers on a common busbar, the partial short-circuit currents flowing in the individual incoming feeders add up… Read more
Oct 07, 2019 | By Edvard Csanyi
Low Voltage
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Automatic transfer switch between three power sources (analysis of schemes)
When a switchboard can be supplied from two or more different sources, transfer between those sources can be done manually or automatically. This kind of configuration is usually designed when reliability and quality of power supply need to be provided…....
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Oct 03, 2019 | By Miodrag Kokotovic
Energy and Power
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Good practice rules for electromagnetic compatibility (EMC) of LV conductors
The search for an overall optimization of the installation with regard to electromagnetic compatibility (EMC) and its ability to function without suffering or emitting excessive interference, comes via a set of good practices, which are often simple and based on…...
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Sep 30, 2019 | By Edvard Csanyi
Low Voltage
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Things you MUST know when commissioning low voltage switchgear and circuit breakers
Purchasing low voltage switchgear is not that easy, it’s not like purchasing a new TV or laptop. You have to be very experienced and deadly serious when specifying and ordering LV switchgear, but also during the commissioning and testing. This…...
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Sep 23, 2019 | By Edvard Csanyi
Energy and Power
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Why we find temperature so important everywhere in electrical engineering?
The purpose of this article is to underline and illustrate the importance of temperature for various aspects of electrical engineering. This is one of the crucial engineering issues from the very beginning in design and procurement stage, later during exploitation,…...
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Sep 20, 2019 | By Miodrag Kokotovic
Energy and Power
Operating centralized automatic compensation systems when supplying linear loads
For energy-efficient operation of decentralized multiply-fed industrial networks, each load-centre substation must have its own centralized reactive-power compensation system for automatic PF correction. The automatic reactive-power compensation systems used for load-related control of the reactive power comprise a PF controller… Read more
Sep 16, 2019 | By Edvard Csanyi
Energy Generation
Generators applicable to high reliability requirements of healthcare and other facilities
Generator systems described in this technical article are applicable to healthcare requirements, as well as other facilities that may require a high degree of reliability. The electrical supply for data centers, financial institutions, telecommunications, government and public utilities also require… Read more
Aug 28, 2019 | By Edvard Csanyi
Energy and Power
What do you need for short-circuit calculations? The less you assume, the better!
If you ask any electrical design engineer what is the most time consuming and critical required in short circuit analysis, he/she would say that it’s obtaining available data. The less data that is assumed, the better and more accurate the… Read more
Aug 21, 2019 | By Edvard Csanyi
Energy and Power
Practical modifications of MV/LV radial distribution systems applied in buildings
This technical article covers low voltage and medium radial distribution systems with their practical modifications: loop-primary system – radial secondary, primary selective system – secondary radial and two-source primary – secondary selective system. This discussion covers the last three modifications… Read more
Aug 14, 2019 | By Edvard Csanyi
