Republish by courtesy of Tesar SrL  

The losses reduction involves major benefits for the environment linked to lower greenhouse gas emissions.


The losses reduction involves major benefits for the environment linked to lower greenhouse gas emissions. It is estimated that over 80% of all environmental impacts it is determined during the design phase of a product.

In this perspective, electric transformers used in electricity transmission and distribution networks must be more efficient due to the enter into force of the new Ecodesign Regulation EU No. 548/2014. Starting from 1st of July 2015, in fact, it is unlawful to place on the market or put into service in the EU Country any power transformers which do not comply with the Regulation. Since transformers are so widely used, even small improvements in their efficiency will make a huge difference.


TESAR, according to the Regulation and to its policy always aimed to “energize the world cleanly”, presents the new range of transformers “Ecodesign”. This new series is the TESAR response to the demands of energy efficiency and reduced environmental impact, combining successfully in a single product competitiveness and sustainability, ensuring significant reduction in energy consumption with significant cost savings and reduction of CO2 emissions.

On the other hands, the common thought is that a more efficient transformer is also more expensive: is it really true?

The standard definition of the life cycle cost of a product is the sum of its purchase price and operating costs over its lifetime. The usual assumption is that an improvement in the energy performance of a product requires a change in product design that increases its price. Consequently, a transformer with reduced losses has a higher purchase cost, while those designed to the minimum cost of manufacture result in increased losses and operating costs.

Nevertheless, whether in assessing the purchase of the transformer we consider the capitalized cost, it may be convenient to buy a low-loss transformer, because some of the possible improvements may pay off during the lifetime, reducing its life cycle cost. The most convenient solution, from the point of view of the total cost, is represented by the minimum of the sum of the manufacturing costs and the costs of losses.

Considering that transformers is energized 24 hours for 7 days, 365 days a year and have very long lifetimes of typically about 30 years, energy consumption is a dominant factor. This means that the higher purchase costs is repaid via savings over the product’s lifetime, since the purchase price is only a marginal part of the total cost of the machine, while the operating cost (mainly related to the losses) accounts for over 80% of the total cost.

Hereunder an example which demonstrates that in a relatively short period, it is possible to recover the additional costs invested in the purchase of a transformer Ecodesign compared to a standard transformer with higher losses.

Kısa bir süre içerisinde, daha yüksek kayıplı standart bir transformatöre kıyasla, Ecodesign bir transformatör alımıyla satın alma aşamasındaki maliyetin karşılandığını gösteren örnek tablo aşağıdaki gibidir.


Kuru Tip Dökme Reçine Transformatörlerde Aluminyum Bakır Karşılaştırması


Kuru Tip Dökme Reçine Transformatörlerde Aluminyum Bakır Karşılaştırması

Comparison Between IEC and Ecodesign Transformers of Different Powers, 20/0,4 kV, 24 kV


Considering a 1000 kVA power transformer, comparing an Ecodesign to a traditional one, higher cost of purchase of the first is recovered in only two year!

When you consider the average electricity cost of EU, the cost saving in 30 years is about 45.000 euro, with considerable advantages also for the environmental impact, with a reduction of greenhouse emission of about 5 tons every year!

So, why not save the planet by saving money purchasing Tesar Ecodesign transformers?


[1] Ecodesign regulation, EU No. 548/2014, May 2014IEC 6076-11, Power Transformers – Part11: Dry-type transformers
[2] IEC 6076-11, Power Transformers – Part11: Dry-type transformers