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  • 1.
    Bergman, Anders
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Elektronik.
    Bergman, Allan
    RISE - Research Institutes of Sweden.
    Jönsson, Bengt
    ABB AB, Sweden.
    Rietveld, Gert
    VSL Nederlands Metrologisch Instituut, Netherlands.
    Sauzay, Mathieu
    JST transformateurs, France.
    Walmsley, Jonathan
    GE Power, UK.
    Sund, John Bjarne
    MSC EE Transformer Consultant, Norway.
    Estimating Uncertainty in Loss Measurement of Power Transformers2019Inngår i: ISH 2019, International Sympsoium on High Voltage Engineering, Budapest, Hungary, August 26-30, 2019., 2019Konferansepaper (Fagfellevurdert)
    Abstract [en]

    The Eco-design directive issued by the European Commission has led to re-quirements 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 easy to understand by all users in the industry. Background theory and material, whilst necessary for understanding, is not required for the day-to-day application of the standard. This paper presents a more detailed background and theory on the measure-ment of transformer losses and how to quantify precision. The authors are all members of the IEC maintenance team working with the standard.

  • 2.
    Bergman, Anders
    et al.
    RISE - Research Institutes of Sweden, Säkerhet och transport, Mätteknik.
    Rietveld, Gert
    VSL, Netherlands.
    CIGRE Science & Enginering, Volume No.15, October 2019: Innovation in the Power Systems industry2019Inngår i: CIGRE Science & Engineering, ISSN 2426-1335, Vol. 15, s. 85-93Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Losses of HVDC converter stations need to be accurately quantified to support evaluation of bids for such systems and to underpin efforts to reduce greenhouse gas emissions. At present, these losses are estimated, based on loss calculations for individual converter components, and no reliable method exists to measure the actual HVDC converter station loss as difference between power on the AC- and DC-side of the station. The necessary requirements for such a measurement are investigated in this study, and a tentative design of a suitable loss measuring setup is explored. This approach is a useful alternative for those cases where a direct measurement of losses via a temporary connection with two converters operating in back-to-back mode cannot be made.

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