Round Robin Converters (RR’C) Results and Conclusions

The test method described in IEC 61800-9-2:2017 (edition 1) for converters (and in IEC TS 60034-2-3:2013 for motors driven by converters) has not been used for sufficient time to know their accuracy and repeatability. At its meeting on 6 September 2017 at EEMODS’17 in Rome, representatives from IEC TC 22/SC 22G/WG18, 4E EMSA and several independent testing labs (“project group”) decided to have 4E EMSA to undertake the project leadership and the organization of a round robin exercise for converters cooperation with IEC WG18. During the round robin exercise, which was launched in the fall of 2019, Denmark, together with Switzerland, was responsible for the organization, monitoring, and documentation of the interlaboratory test for converter losses. A total of 8 from the originally 11 laboratories were even able to perform a total of 172 tests on 52 different converters. The power range within participating laboratories was limited to the range between 0.12 and 55 kW. The results of the Round Robin Converters (RR’C) do build key evidence for the revision of IEC 61800-9-2 ed. 2, especially the design of an updated and solid testing procedure which will also presented, and the provision of sufficient solid and impartial measured background data for the correction of the current level of the reference values for losses inside converters for further revisions of the standard.