Sizing of 110V DC charger for MV panels – Auxiliary power supply in power substations
An auxiliary DC power system that consists of a charger, battery bank, DC distribution system, and monitoring system is a critical part of the primary/secondary substation. It is directly associated…...
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Feb 08, 2021 | By Bishal Lamichhane

Mastering switchgear control circuits: trip, BCPU and alarm, indication, and interlock circuits
In the previous article, an introductory part of the switchgear control circuits, including DC/AC circuits and breaker closing circuit, was discussed thoroughly. This article continues the discussion with a breaker…...
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Dec 14, 2020 | By Salem Alshahrani

Mastering switchgear control circuits – AC/DC circuits and circuit breaker closing circuit
Control circuits are vital to the operation of medium voltage switchgear. The integrity of these control circuits is essential to the switchgear’s proper operation, so commissioning and maintenance activities records…...
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Nov 30, 2020 | By Salem Alshahrani

Learn how to draft the layout and arrangement drawing of 33/11 kV distribution substation
Medium voltage substations fall within the sub-transmission power system category, which feeds the bulk consumers directly or facilitates the secondary and tertiary distribution to small industrial and household consumers over…...
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Nov 17, 2020 | By Bishal Lamichhane

Learn how to analyze MV switchgear wiring diagrams and single line diagram
The capability of reading different types of drawings is an essential skill to perform almost all of the engineering tasks. The engineering drawings form the building blocks of industry method…...
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Oct 05, 2020 | By Salem Alshahrani

My experience in the first synchronization of the MV generator in an industrial plant
Any power plant commissioning, from small industrial GTG (Gas-To-Gasoline) to nuclear facility, will converge to a very final step before (provisional) commercial operation, sometimes empathized as “first kW”: synchronization to…...
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Sep 21, 2020 | By Marco Bruschini

Secondary LV/MV distribution substations in a nutshell (connections and types)
The general method of supplying bulk power to buildings, factories or other complexes is by means of an MV supply, usually at 10 kV, occasionally at 6.6 kV. The installation… Read more
Aug 05, 2020 | By Edvard Csanyi

Installation guidelines for MV metal-enclosed switchgear and controlgear (IEC 62271-200)
What does it mean ‘metal-enclosed switchgear’? Metal-enclosed switchgear and controlgear are generally assembled from type-tested panels. As per IEC 62271-200 metal-enclosed switchgear installations must be designed so that their insulation… Read more
Jul 27, 2020 | By Edvard Csanyi

A case study of fault level calculations for a MV/LV network using direct method
This technical article represents the case study of fault level calculations for an MV/LV network using the direct method. There are many advantages of the direct approach, and the main…...
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Jul 19, 2020 | By Sivakumar K

My experience and guidance in the design and electrification of a modern airport
The electrical systems for airports require proper quality installations and consideration for features usually not involved in other electrical installations. In this article, we will be discussing the general elements…...
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Jun 29, 2020 | By Bishal Lamichhane

Primary rated values for medium voltage switchgear often mixed by engineers
It’s not unusual to see that engineers mix terms of primary ratings. If they are not understood well, yes, it’s possible to mix some of them. But it’s essential to… Read more
Jun 22, 2020 | By Edvard Csanyi

The most common issues I experienced in wiring of a medium voltage switchgear
Nowadays, the design and manufacturing of a Medium Voltage switchgear is not an easy task. Many factors could affect the generation of an optimal set of engineering drawings to be…...
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May 18, 2020 | By Ivan Contreras

My experience in the design and installation of medium voltage switchgear
Medium Voltage (MV) switchgear is typically any switchgear over 1000V in the United States (US). Some of the nominal voltage ratings used in the US by power utilities are 2.4-4.16kV,…...
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May 07, 2020 | By Amar M

Switching devices you are likely to spot in every medium voltage switchgear
Up to and including 52 kV voltage range is generally referred to as “medium voltage”. This technical article shed some light on a few devices you are likely to spot…...
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Apr 13, 2020 | By Edvard Csanyi

Mastering single line and wiring diagrams: Using circuit breaker for MV power factor correction
Within this article, a custom-made cubicle intended for supply and protection of MV reactive power compensation block will be analyzed. Technical characteristics of major electrical components, together with three line…...
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Apr 09, 2020 | By Miodrag Kokotovic
