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The Eco-design directive issued by the European Commission has led to requirements on efficiency of power transformers. In the case of large power transformers used in grid applications, serious problems are encountered in establishing how reliable the loss measurements are. An effort is currently on-going within IEC to produce a documentary standard on "Rules for the determination of uncertainties in the measurement of the losses of power transformers". An IEC standard should be clear and easydoi:10.5281/zenodo.3559837 fatcat:j3jcwqfosrawxiokw2uhjmomui