Energy and Power
Hey engineers, wish you a happy and normal new year, 2021!
Just a short note from me today, the end of this crazy year. I’d like to wish you a normal and happy New Year on behalf of myself and everyone else at EEP. This year was like no other year… Read more
Dec 30, 2020 | By Edvard Csanyi
Energy and Power
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Ten most dangerous mistakes in the operation of low voltage switchgear (you should be aware of)
Low-voltage equipment is generally classified as any equipment that requires a rating of less or equal to 1000 volts to operate. With a majority of electrically driven equipment falling under this category in industrial environments, this technical article focuses on…...
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Dec 28, 2020 | By Ezeala Winner
Electrical Lectures
The facts about numerical relays that every electrical engineer should know
The first protection devices based on microprocessors were employed in 1985. The widespread acceptance of numerical technology by the customer and the experiences of the user helped in developing the second generation numerical relays in 1990. Modem power system protection… Read more
Dec 23, 2020 | By Edvard Csanyi
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: single-phase burnout, overload, unbalanced voltage, and voltage spikes. Voltage spike… Read more
Dec 21, 2020 | By Edvard Csanyi
Medium Voltage
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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 trip circuit, bay control-protection unit (BCPU) & alarm circuit, indication…...
Membership Upgrade Required
This content is not available in your premium membership plan. Please upgrade your plan in order to access this content. You can choose an annually based Basic, Pro, or Enterprise membership plan. Subscribe and enjoy studying specialized technical articles, online video courses, electrical engineering guides, and papers.With EEP's premium membership, you get additional essence that enhances your knowledge and experience in low- medium- and high-voltage engineering fields.
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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 component and the magnetizing component. The loss component is in… Read more
Dec 07, 2020 | By Edvard Csanyi
