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

Transformer no-load loss and excitation-current measurements

A transformer dissipates a constant no-load loss as long as it is energized at constant voltage, 24 h a day, for all conditions of loading. This power loss represents a… Read more

Mar 27, 2019 | Edvard

6 system requirements of HV and EHV circuit breakers

With the phenomenal growth of the power system (EHV and HV) the duties that a circuit breaker is called upon to perform, besides the ability to handle short circuits, have… Read more

Mar 20, 2019 | Edvard

Inspection and maintenance of capacitor banks (recommended practices)

Capacitor banks generally require very little maintenance because they are static type of equipment, but don’t be fooled by this statement. Capacitors are well known for their dangerous reaction when… Read more

Feb 13, 2019 | Edvard

Transformer pre-commissioning tests and after-receipt checks you MUST perform

Once oil filling is completed, various pre‐commissioning checks and tests are performed to ensure the healthiness of the transformer (or reactor) prior to its energization. Various electrical tests must be… Read more

Dec 26, 2018 | Edvard

8 practical applications of testing ground system using clamp-on tester

First of all, it is extremely important that the operator/engineer understand the ground system that is being tested. The clamp-on measurement works well in many situations, but it has limitations… Read more

Aug 08, 2018 | Edvard