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In this paper, a correction method is introduced to make a more accurate calculation of winding eddy-current losses of high-voltage direct current (HVDC) converter transformer. The assumption that winding eddy-current losses of HVDC converter transformers follow the frequency with the exponent 2 proposed by IEC 61378-2 Std. is thought to be inappropriate and the skin effect should be taken into consideration...
Stray losses in structural parts are calculated separately during determining load losses of HVDC converter transformers, but the calculation method proposed by IEC 61378-2 standard shows significant difference from the experimental results. The nonlinearity, hysteresis losses, and frequency characteristic are thought as the sources of errors in this paper, and then an electromagnetic-circuit coupling...
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