Gert Rietveld, Ernest Houtzager, and Dongsheng Zhao, “Impact of the Ecodesign Directive on Traceability in Power Transformer Loss Measurements”, Proceedings of the 23rd International Conference on Electricity Distribution (CIRED 2015), Lyon, France, Paper 1538, 15-18 June 2015.
Losses constitute a significant part of the total cost of ownership of power transformers. Since these losses have an impact on the environment as well, the European Union has issued a regulation with regard to losses in power transformers, as part of the sustainable energy policies of the Ecodesign Directive. Already for many years, commercial power transformer loss measurement (TLM) systems are used by power transformer manufacturers for verification of the loss specifications of their products. With the new commission regulation, it is more than ever important to calibrate these TLM systems to assure and demonstrate an independently verified accuracy in the tests. Two approaches can be used in calibrations of TLM systems: a component and a system calibration approach. The latter has the advantage that all influence factors of the complete TLM system are taken into account in the calibration. Using state of the art reference equipment, in both approaches calibration accuracies can be achieved down to 20 parts in 106 in magnitude and 1 m° in phase, at least a factor 5 better than typical TLM system specifications.
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