Electric Motor
Troubleshooting the most typical winding problems of three phase electric motors
It’s always important to identify the real cause of burned windings and not just to replace the electric motor. Motor windings have a different appearance in all these failure situations:… Read more
Dec 21, 2020 | By Edvard
Medium Voltage ♛
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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…...
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Dec 14, 2020 | By Salem Alshahrani
Protection
Exciting and inrush currents in transformers that often make protection relays go crazy
If normal voltage is impressed across the primary terminals of a transformer with its secondary open-circuited, a small exciting current flows. This exciting current consists of two components, the loss… Read more
Dec 07, 2020 | By Edvard
Medium Voltage ♛
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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
Energy and Power
Your Cyber Monday in EEP! Save Big on Premium Membership and Video Courses
Hello, hope all is well with you! It’s our pleasure to share with you two Cyber Monday deals for our new electrical engineers, expiring on December 3rd: 20% on EEP… Read more
Nov 26, 2020 | By Edvard
Electric Motor
The most used types of single-phase motors in the world
You should know that single-phase motors are rarely rated above 5 kW. Fractional-kilowatt motors, most of which are single-phase, account for 80−90% of the total number of motors manufactured and… Read more
Nov 23, 2020 | By Edvard
Medium Voltage ♛
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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…...
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Nov 17, 2020 | By Bishal Lamichhane
Power Substation
Improving the cybersecurity of substations using intrusion detection
Multiple layers are necessary to ensure the cybersecurity of substations. Cryptography allows authentication of devices, but not all attacks can be prevented with these measures. Firewalls and “air gaps” can… Read more
Nov 16, 2020 | By Andreas Klien
Protection
Ohmic relay applications for protecting power system, lines and generators
This class of relays was originally used to protect transmission lines and were believed to measure the distance from the relay location to a fault. Currently, several types are applied… Read more
Nov 09, 2020 | By Edvard
Electric Motor ♛
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Mastering Motor Control Center (MCC): Wiring diagrams and equipment from zero to hero
Motor control center (MCC) was introduced back in 1937 to place different motor starters in one cabinet to save space. It is a modular cabinet that supplies and controls motors,…...
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Nov 02, 2020 | By Salem Alshahrani
High Voltage
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… Read more
Oct 28, 2020 | By Edvard
High Voltage
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… Read more
Oct 26, 2020 | By Edvard
Power Substation
The facts about switchyards, incoming and outgoing feeder connections, CTs and VTs
What do you need to know about designing a switchyard? Well, to simplify, you need a lot and it’s not that simple. Switchyards need to be designed with respect to… Read more
Oct 21, 2020 | By Edvard
Energy and Power ♛
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Why remote racking of LV/MV circuit breakers is a smart investment but so rare to see?
Circuit breaker racking is one of the most prominent exercises in the power system that exposes an operator to risk. A sudden malfunction during the racking process can induce catastrophic…...
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This technical article/guide requires a Premium Membership. Get access to all premium HV/MV/LV technical articles, electrical engineering guides, and papers. Check out each plan's benefits and choose the membership plan that works best for you or your organization.You can choose an annually based Plus, Pro, or Enterprise membership plan.
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Oct 19, 2020 | By Bishal Lamichhane
Protection
How primary feeder, distribution transformer, fuses and service operate in radial networks
As we already know, distribution transformers step down from the distribution or primary feeder voltage to the utilization voltage. They are connected to the primary feeder, sub-feeders, and laterals through… Read more
Oct 12, 2020 | By Edvard
