BS EN 50708-2-1:2020 pdf free.Power transformers – Additional European requirements. Medium power transformer – General requirements.
BS EN 50708-2-1 The tables below indicate the maximum level of losses for no-load losses and for load losses for TIER1 and TIER2.TIER1 has been applied since 1 July 2015 for the values of losses following Commission Regulation (EU) No 548/2014 of 21 May 2014 and its amendment No 2019/1783 of 1 October 2019.TIER2 shall be applied from 1 July 2021 for the values of losses following Commission Regulation (EU) No 548/2014 of 21 May 2014 and its amendment No 2019/1783 of 1 October 2019.Table 1 and 2 define load losses and no-load losses for one winding with Um≤24 kV and the other
one with Um≤3,6 kV. Additional corrections are defined for highest voltage, dual voltage or special on load tapping, given in Table3, 4, 5 and other clauses. Corrections factors in Table3, 4, 5 are cumulative.During factory acceptance tests, the measured values of no-load and load losses shall not exceed
the respective maximum values determined with Table 1 and 2 and 6 and corrected by corrections factor as stated above.The reference conditions defined in EN 50708-1-1:2020 applies. Other values of short- circuit impedance can be specified by the purchaser for particular system service conditions, e.g. in the case of parallel operations in all tables of this clause.The sound power levels are given in Tables 1 and 2. Transformers can be requested or offered with
sound power level LWA other than the listed values. Unless otherwise agreed between manufacturer and purchaser the sound power level LWA given in
Tables 1 and 2 are considered for no load condition. NOTE Loss levels and correction factors defined in 5.2.1.3 and 5.2.1.4 refer to two winding medium power transformers. Loss levels for three windings medium power transformers are not defined due to lack of data at the time of the publication of this standard. EXAMPLE cumulative corrections:In case of transformers having primary highest voltage for equipment Um = 36kV and secondary highest voltage for equipment Um S 3,6kV allowing 10 % on Pk and 15 % on PO according to Table 3, and having dual voltage on one winding allowing 10 % on Pk and 15 % on PO according to Table 4.BS EN 50708-2-1 pdf download.