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
Maintenance
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12 on-site checks to inspect the transformer’s health
On-site inspection of the substation transformer usually exposes important condition changes and it initiates various suspicions that need to be investigated in detail. As with any other substation equipment, many things could go wrong during the transformer operation. For example,…...
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Nov 11, 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
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The essentials of an automatic changeover systems in medium voltage networks
In medium voltage distribution networks, it is important to maintain a high level of reliability. Industry relies on the continuous operation of critical plant, which requires no or little disruption to the electrical supply. There are various methods for building…...
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Nov 04, 2019 | By Edvard Csanyi
Medium Voltage
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Lessons I learned during the start-up of an MV switchgear
In the world of electrical engineering, a term start-up assumes all works which are necessary to be done for putting in operation already tested switchgear, as close as possible installed in position and ambient defined by design documentation and employer’s…...
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Oct 31, 2019 | By Miodrag Kokotovic
Energy and Power
Reactive power compensation in electrical plants with generators
Compensation of reactive power applied in buildings or small facilities operates in the first and second quadrants of the coordinate system. Increasingly, complex industrial plants, for example plants burning wood dust, are using generators driven by steam engines running parallel… Read more
Oct 30, 2019 | By Edvard Csanyi
Protection
Principles and applications of busbar protection schemes (you SHOULD know about)
In the olden days, the clearance of busbar faults was done by time-delayed distance relays or overcurrent relays, resulting in an extension of fault for a longer duration of time. In the present day’s networks, which are highly interconnected, having… Read more
Oct 28, 2019 | By Edvard Csanyi
Energy and Power
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Power supply conceptual schemes for small, medium-sized and large industrial plants
This technical article presents preferred system structures and power supply concepts for small, medium-sized and large industrial plants that meet the different requirements for power demand and supply quality. For each plant size, Siemens’s LV/MV distribution switchgear and distribution transformer…...
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Oct 22, 2019 | By Edvard Csanyi
Energy and Power
Standard cubicle configurations for a medium voltage metal-enclosed switchgear
This technical article will shed some light on the standard design of medium voltage metal-enclosed switchgear cubicles in terms of enclosure configurations as well as the characteristics of busbar system. Article explains the following cubicles types: incomer feeder, direct incomer,… Read more
Oct 21, 2019 | By Edvard Csanyi
Power Substation
IED (Intelligent Electronic Device) advanced functions that make our life better
Intelligent electronic devices (IEDs) have been deployed extensively in power automation systems recently, and the shift from RTUs to IEDs is evident due to the integration and interoperability features of the IEDs. This technical article briefly explains the IED advanced… Read more
Oct 16, 2019 | By Edvard Csanyi
Energy and Power
Occurrence and detection of an earth fault in MV power systems with isolated neutral
The mode of operation of an MV industrial power system that is galvanically isolated from the public power supply is determined by the method of neutral earthing on the secondary side of the transfer transformer. The following methods of neutral… Read more
Oct 14, 2019 | By Edvard Csanyi
Power Substation
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Top ten software for electrical design, analysis and simulation of T&D networks
The importance of stability and maintaining the power quality of the electricity transmission and distribution (T&D) networks necessitates a thorough examination of all aspects of the design, analysis, and simulation of the transmission and distribution networks by all persons associated…...
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Oct 10, 2019 | By Ali Bahonar
Energy and Power
Medium voltage switches for isolation and earthing (applications and IEC 62271 ratings)
Medium voltage switches for use on 1-52kV indoor systems are predominantly used for isolation and earthing. Although the majority of these switches are air insulated, gas insulated (SF6) combination switches are available, which are designed for load and fault current… Read more
Oct 09, 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
