Abstract
Different systematic error characterictics of the Epstein and the Single Sheet Tester (SST) method (accordin to IEC publ. 404-3 (1992)) cause differences of up to 10% between the specific total power loss values provided by th two methods, resulting in inconsistent values of core loss building factors in transformers. In addition, the older SST version, SST(1982), being calibrated to the Epstein tester which uses annealed samples, has been found to yiel questionable results for some materials.Moreover, the calibration to the Epstein tester tends to decrease th reproducibility. This unclear situation made ABB initiate an international Round-Robin Test of correspondin measurements of grain-oriented materials including the comparison of SST(92) and SST(82). The results of this stud are presented in this paper along with the presentation of the application issues. The results underline the need for further activities in this field. These activities should aim at arriving at the mo reproducible and reasonably simple method which delivers power loss values acceptable to manufacturers an consumers. The paper concludes with suggestions for future work.
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