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Power transformers are the key components in the power production, transmission and distribution sectors, at the same time interconnecting systems at different rated voltages from power plants to final users and also protecting the different systems by reducing the short circuit current flowing from the system, where the fault happened, to the others. Following the needs of the industrial and transport sectors, special transformers have been developed over the years and, since then they have been playing a crucial role, too. Furthermore also the measuring of current and voltage in each sensible point of a power system and in particular the reliability of these values are of vital importance for the power grid management and the controlling of the correct operation of all interconnected equipment. That’s exactly where the instrument transformers come into play. Therefore, in order to guarantee a precise and effective monitoring of the power grid’s behavior and to keep high reliability of such systems in particular in cases of extreme faults, an accredited, experienced and third party testing of these components is a fundamental requirement.

What we do

CESI can provide tests on power transformers (both oil-immersed and dry-type) and instrument transformers according to internationally recognized standards:


Oil-immersed power transformers
IEC 60076-1, IEC 60076-2, IEC 60076-3, IEC 60076-5, IEC 60076-10
Dry-type power transformers
IEC 60076-11
Instrument transformers
IEC 61869-1, IEC 61869-2, IEC 61869-3, IEC 61869-5, IEC 60044-7


Further tests according national standards and specific customer requirements are also available on request.

Where we do it

Our power transformers testing laboratories are distributed over the three platforms and include:


CESI Group tests transformers since more than 40 years, counting on the great experience of its experts, especially for electrodynamic tests, who have been participating and still participate to those Working Groups where most of the IEC standards have been discussed. The fact that CESI Group can be numbered among the few skilled testing companies in the world capable of performing all tests prescribed for dry type transformers in the relevant standard, is itself the best evidence of CESI Group’s rare skills in the transformers’ testing business.​​​​​​​​​​



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