Mastering switchgear control circuits: trip, BCPU and alarm, indication, and interlock circuits
In the last article, an introductory part of the switchgear control circuits, including DC/AC circuit and breaker closing circuit, was discussed thoroughly. This article continues the discussion with a breaker trip circuit, bay control-protection unit…...
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Dec 14, 2020 | 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 are extremely important for troubleshooting…...
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Nov 30, 2020 | Salem Alshahrani
My experience in drafting the layout & 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 an area after a suitable…...
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Nov 17, 2020 | Bishal Lamichhane
Testing and commissioning of MV/HV switchgears (wiring, final inspection and checks)
This article continues the series of articles dedicated to erection, testing and commissioning of MV/HV switchgears by describing the most important precautions and recommendations in various procedures and steps. Starting from the wiring of low… Read more
Oct 28, 2020 | Edvard
Guide to erection and commissioning of MV/HV switchgears (Inspection, installation and assembly)
Erection and commissioning of MV/HV switchgear are quite complex and full of tiny little details that can easily make your project slow down or even stop. Not to mention deadlines and penalties which are hanging… Read more
Oct 26, 2020 | Edvard
How hard can be analyzing 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 to convey detailed information to…...
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Oct 05, 2020 | Salem Alshahrani
My experience in the first synchronization of the MV generator in an industrial plant
Any power plant commissioning, from small industrial GTG to nuclear facility, will converge to a very final step before (provisional) commercial operation, sometimes empathized as “first kW”: synchronization to local or national grid. This is…...
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Sep 21, 2020 | 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 comprises secondary distribution substation at… Read more
Aug 05, 2020 | Edvard
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 capacity, degree of protection, current… 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 of them is that it…...
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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 of electrical practices and facilities…...
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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 differentiate them. This technical article… 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 easily followed by the wiring…...
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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, 7.2kV, 13.8kV, 14.4kV, 23kV, 34.5kV…...
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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 in most of the medium… Read more
Apr 13, 2020 | Edvard
