Energy and Power
The magic that isolation transformer uses to suppress transients and noise
Transformers are not perfect. Transients and noise (radio-frequency and low-level spikes) normally pass through transformers, not only by way of the magnetic lines of flux between the primary and the… Read more
Jul 21, 2021 | By Edvard
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Power transformers testing and commissioning at the site (instructions and precautions)
Since I started the commissioning work 30 years back, transformer commissioning consisted of more tests, but nowadays, the number of tests has been reduced due to costs and time-saving. This…...
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May 31, 2021 | By Omar Salah
Power Substation
The most common failure modes of electrical equipment in distribution systems
Each piece of electrical equipment on a distribution system has a probability of failing. When first installed, a piece of equipment can fail due to poor manufacturing, damage during shipping,… Read more
May 10, 2021 | By Edvard
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My worst experience in testing and commissioning power transformers (and how I fixed things up)
Reliable and secure electric power delivery is dependent on power transformers’ reliability that is enhanced significantly by sound test plans. These test plans shall be prepared by both manufacturers and…...
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This technical article/guide requires a Premium Membership. You can choose an annually based Plus, 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.Check out each plan’s benefits and choose the membership plan that works best for you or your organization.
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Apr 29, 2021 | By Salem Alshahrani
Electrical Lectures
Learn how to interpret transformer nameplate information
As we all know, all substation equipment (should) have a metal plate with its “name” on it. Here we’ll discuss power and distribution transformers and information that their nameplates carry…. Read more
Apr 12, 2021 | By Edvard
Protection
Three basic principles of differential protection you SHOULD properly understand
The three basic principles of differential protection explained in this article, which has been known for decades, are still applicable and independent of the specific device technology. The differential protection… Read more
Mar 29, 2021 | By Edvard
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The mystery of nuisance tripping incidents in transformer protection that worry engineers
This technical article deals with transformer failure incidents due to nuisance tripping caused by various design flaws, operational conditions, or improper protection relay settings. The focus is on differential protection…...
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This technical article/guide requires a Premium Membership. You can choose an annually based Plus, 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.Check out each plan’s benefits and choose the membership plan that works best for you or your organization.
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Feb 22, 2021 | By Salem Alshahrani
Maintenance
Troubleshooting Buchholz relay and recommended actions when it operates
This technical article provides guidance on the possible causes of Buchholz relay operation and recommends actions following the receipt of a Buchholz surge trip or gas collection alarm. It covers… Read more
Feb 15, 2021 | By Edvard
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
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
Testing and Commissioning
Hints on installation and commissioning power transformers (experience and recommendations)
Purchasing a power transformer for a project is always challenging for every electrical engineer dealing with the procurement. You could omit dozens of possible details from the final specification and… Read more
Sep 28, 2020 | By Edvard
High Voltage
How to shrink three-phase AC high voltage substation and optimize cost and space
Nowadays, when every cent is essential when building a substation, it is imperative to optimize each HV equipment without compromising functionality. This technical article deals with a few solutions to… Read more
Jul 06, 2020 | By Edvard
Protection
The impact of interconnection transformer on the protection of the utility system with DG
Interconnection transformers are used to interface a distribution generation (DG) unit with an existing power system, and to provide the necessary isolation. Utilities recommend using an interconnection transformer to eliminate… Read more
Jun 03, 2020 | By Edvard
Electrical Lectures
Transformer connections you are not allowed to forget
Transformers used in power substations or a power system could be a bank of three single-phase transformers connected in either star/delta or star/star etc., or could be a single three-phase… Read more
May 20, 2020 | By Edvard
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Practical tips for the protection of generators and power transformers
There are usually several ways of protecting HV/MV generators and transformers. It should be noted that one protection relay is often used for several functions, for example, an overcurrent relay…...
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This technical article/guide requires a Premium Membership. You can choose an annually based Plus, 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.Check out each plan’s benefits and choose the membership plan that works best for you or your organization.
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Apr 17, 2020 | By Edvard
