Coordinator: Gert Rietveld

The uncertainty analysis of power transformer loss measurements is complex and difficult to understand for test engineers because it requires a complex mathematical modelling and the taking into account of several uncertainty sources. Therefore, both CENELEC and IEC provide specific guidance for this uncertainty analysis in EN 60076-19 and IEC 60076-19 respectively. The standard IEC60076-19 is presently being updated with an improved mathematical model and more extensive sample calculations. However, currently this standard does not provide support for the uncertainty evaluation of reactor loss measurements or give an indication of the effect of non-sinusoidal test signals on the test uncertainty. CENELEC TC 14 explicitly expressed that “guidance on uncertainty calculations for reactor loss measurements is particularly required. In addition, studies are needed on the effects of non-sinusoidal test signals used in practice on the final accuracy of the loss measurement”.

To address this need, guidelines to power transformer and reactor manufacturers for the complex uncertainty analysis of loss measurements on their high-power, high-efficiency products, including the effects of non-sinusoidal test signals are developed including the uncertainty calculation of high-efficiency reactor loss measurements. The effects of using non-sinusoidal test signals on the final accuracy of loss measurements are also investigated. Outputs from the results in the form of a study report are produced and submitted to CENELEC TC 14 for updating the EN 60076-19 standard.

For more information, see the project webpage >>