Posts Tagged ‘the transformer’

How to specify dry type transformer

September 19th, 2016 | 1 Comment | Posted in Electrical distribution
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megaphone-blueHi everyone it’s Steven Mill. It’s been a while but I’m back with an article for my dear community. Today I want to deal with a basic: “how to specify dry type transformer”. Hope it will help some of you.

If you wonder how I get my articles published, well it’s easy as ABC cause I just propose an article by mail to the moderator team and after a quick review, they publish it :) So do not hesitate. The more the merrier!


Generally, specifying dry type transformer is same as specifying oil transformer. Yet, as dry type transformer is usually used in indoor and when apparent risk exist, there are some specifications we should consider.

Delta-Wye transformer: what happens during phase to phase fault?

July 7th, 2016 | 1 Comment | Posted in Electrical distribution
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Hello, it’s Steven Mill and today I want to tell you about a kinda technical subject. I’ll try to answer the following question:

“What happen in Delta-Wye transformer during phase to phase fault?”

I hope you will enjoy it! Remember that you can publish articles just like me, just send a mail to the great team.


Condition monitoring of the transformer (back to basics)

June 13th, 2016 | 1 Comment | Posted in Electrical distribution
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Hi this is Steven Mill! I’m back with a back to basics article about condition monitoring of the transformer. Hope it will help y’all!

The transformer is the most crucial part in electrical distribution system as it is the most expensive equipment in an electrical distribution system. If a transformer fail unexpectedly, not only it will affect the electrical supply but also it will cost you time and money. Hence it is important to detect early sign of fault to avoid power outage and extra cost.

In this article, we will discuss several techniques used to monitor the condition of the transformer. Those techniques are:

  1. Acoustic Monitoring
  2. Infrared Monitoring
  3. Dissolved Gas Analysis
  4. High Performance Liquid Chromatography
  5. Partial Discharge
  6. Frequency Response Analysis
  7. Power Factor
  8. Winding Resistance
  9. Core Insulation Resistance


Too much moisture in the transformer – how to measure and drying out?

July 6th, 2015 | 2 Comments | Posted in Electrical distribution
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As an electrical engineer, it’s important to keep your equipment clean to ensure a good maintenance.

What to do when there is “moisture” in the transformers? That’s the question this article will answer.

Moisture in the transformer

The term, “moisture in the transformer,” which is frequently used in the electrical industry, either refers to the water absorbed by the paper in the transformer, or the water that gets dissolved in the oil of the transformer.

Moisture can be found in various parts of a transformer’s insulation system. It can often get accumulated in the solid insulation of the transformer; get mixed up with the oil; and sometimes, it can also be found in the form of water accumulated at the bottom of the insulation core.

How to maintain a load tap changer to increase the reliability of the transformer

June 5th, 2015 | 1 Comment | Posted in Power quality
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Load tap changer maintenance is the most important aspect that governs the reliability of a transformer.

There are a few recommendations in place that play a critical role in the maintenance of load tap changers (LTC). And today, one of our members kindly sent us an article about it.

Oil Used LTC

Oil used load tap changer

In this kind of load tap changers, oil is used for arc-quenching purpose. Depending on the load of the transformer and other parameters, arcs keep producing at the arcing switches and contacts. These arcs tend to carbonize the switching oil which in turn leads to corrosion of the internal components of the LTC.

The intensity of the oil that is contaminated due to these arcs generally depends on the number operational hours, operating current on the LTC and last but not the least, quality of the oil used for insulation purposes.


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