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 | Edvard

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 | 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 | 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 | Edvard

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 | Ivan Contreras

My experience in the design and installation of medium voltage switchgears

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 | 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… Read more

Apr 13, 2020 | Edvard

Mastering single line and wiring diagrams: Using circuit breaker for MV power factor correction

Within this article, 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 | Miodrag Kokotovic

Mastering single line and wiring diagrams: MV earth fault protection

This technical article continues the series of articles dedicated to mastering single line and wiring diagrams of medium voltage switchgear. This time, the subject is the principle, and realization of…...

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Mar 26, 2020 | Miodrag Kokotovic

Mastering single line and wiring diagrams: Interlocking between MV cubicles

There are numerous variations of MV switchgear topology, measurement, and control logic. However, there are also some basic rules related to these aspects which may be frequently seen in practice,…...

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Mar 12, 2020 | Miodrag Kokotovic

Design tips for medium voltage systems and switchgears in power substations

Medium voltage networks are networks with rated voltages of over 1 kV and up to 36 kV. Medium voltage switchgear is used in transformer substations and switching substations, and in… Read more

Feb 26, 2020 | Edvard

IEC and NEMA/IEEE ratings of current transformers (CTs) in medium voltage applications

First, let’s remind ourselves of the basics in a few sentences. That is something you must know. A current transformer (CT) is designed to produce a secondary current which is… Read more

Jan 20, 2020 | Edvard

The story of designing the electrical part of MV/LV power substation

Designing a new MV/LV distribution substation is somewhat complicated and involves a lot of factors you must take care of. This technical article will try to present the essential steps… Read more

Jan 15, 2020 | Edvard

The art of arc-protection relaying in MV applications

Arc-flash detection relays are superior and provide much faster arc-flash detection times compared to the differential relays. With modern arc-flash detection technology, this detection time is of the order of…...

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Jan 08, 2020 | Edvard

The analysis of MV/LV incoming supply configurations for large industrial plants

The metal-processing industry is an excellent example where you can find specific large industrial plants. Why specific? Maybe because in such plants, there are only a few individual large loads…...

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Dec 18, 2019 | Edvard