Electrical insulation testing – Often underestimated until things go really bad

Due to mechanical damage, vibrations, (excessive) heat/cold, moisture/humidity, chemical influences and interactions and aging pinholes, cracks causes moisture and foreign matter to penetrate the surface of the insulation. They create… Read more

Jun 17, 2020 | Edvard

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

Twelve doubts in ground testing that make electrical engineers pretty confused

Ground testing is often misunderstood by electrical engineers and technicians who do not perform such testing often and regularly. It seems that there are a lot of questions and doubts… Read more

May 06, 2020 | Edvard

The art of transformer maintenance, inspection and repair (recommended practices)

The primary purpose of transformer maintenance is to ensure the internal and external parts of the transformer and accessories are kept in good condition and “fit for purpose” and able… Read more

Feb 10, 2020 | Edvard

How to avoid common mistakes during wiring and startup of power factor correction (PFC) cubicle

Power factor correction (PFC) and reactive power compensation (RPC) are often used as synonyms in practice. Although they are similar and mutually dependent terms, they don’t represent the same thing…....

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Jan 16, 2020 | Miodrag Kokotovic

12 on-site checks to inspect the transformer’s health

On-site inspection of the substation transformer usually exposes important condition changes and it initiates various suspicions that need to be investigated in detail. As with any other substation equipment, many… Read more

Nov 11, 2019 | Edvard

13 very important type tests of a low voltage switchgear carried out by the manufacturer

Certification of distribution assemblies is defined by international standard IEC 61439-1. This standard provides common rules that are recognized worldwide. Compliance with the standard is certified, depending on the country… Read more

Nov 06, 2019 | Edvard

Lessons I learned during the start-up of an MV switchgear

In the world of electrical engineering, a term start up assumes all works which are necessary to be done for putting in operation already tested switchgear, as close as possible…...

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Oct 31, 2019 | Miodrag Kokotovic

Pre-commissioning checks and tests of high voltage current transformers (CTs)

Once erection is completed, various pre-commissioning checks and tests are performed to ensure the healthiness of the switchyard equipment prior to their energization. This technical article explains various major electrical… Read more

Oct 02, 2019 | Edvard

Things you MUST know when commissioning low voltage switchgear and circuit breakers

Purchasing low voltage switchgear is not that easy, it’s not like purchasing a new TV or laptop. You have to be very experienced and deadly serious when specifying and ordering… Read more

Sep 23, 2019 | Edvard

Testing and commissioning of HV power transformers, circuit breakers, CTs and VTs

As you already know, substations are the points for controlling the supply of power on different routes by means of various equipment such as power transformers, circuit breakers, CTs/VTs, compensating… Read more

Sep 11, 2019 | Edvard

Example of 33/11 kV substation on-site assessment report

This technical article presents the shorten version of the report of an on-site assessment at the 33/11 kV Shatt Al Arab substation built in Iraq back in 2005. The assessment… Read more

Jul 17, 2019 | Edvard

The most important precautions during commissioning and start up of LV switchgear

Low voltage switchgear can often be very complex and expensive piece of electrical equipment, usually representing one of the most critical and crucial parts of the project. In order to…...

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Jun 13, 2019 | Miodrag Kokotovic

3 most important routine tests for successful verification of a low voltage switchgear

Individual tests or routine verifications are intended to check the essential safety aspects of LV assemblies that could be affected by hazards during mounting or possible manufacturing faults. In principle,… Read more

May 08, 2019 | Edvard

7 routine tests for a dry-type transformer you should perform during commissioning

This technical article briefly describes seven very important tests you should perform during commissioning of a dry-type transformer. Usually tests are performed in the factory where transformers are produced. The… Read more

Apr 03, 2019 | Edvard