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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...
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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...
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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 The post 6...
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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 The post...
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7 routine tests for a dry-type transformer you should perform during...
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...
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3 most important routine tests for successful verification of a low voltage...
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...
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The most important precautions during commissioning and start up of LV...
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... Read more...
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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 The post...
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Testing and commissioning of HV power transformers, circuit breakers, CTs and...
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,...
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Things you MUST know when commissioning low voltage switchgear and circuit...
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 The post...
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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...
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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... Read more The post...
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13 very important type tests of a low voltage switchgear carried out by the...
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,...
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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...
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How to avoid common mistakes during wiring and startup of power factor...
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...
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The art of transformer maintenance, inspection and repair (recommended...
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...
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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 The...
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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,... Read more The...
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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...
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Hints on installation and commissioning power transformers (experience and...
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...
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