caa a22 4500 477130690 CHVBK 20180405111703.0 cr unu---uuuuu 170330e19970301xx s 000 0 eng 10.1007/BF02767198 doi (NATIONALLICENCE)springer-10.1007/BF02767198 Effectiveness of modernizing the generators at the Plavinas hydroelectric station [Elektronische Daten] [V. Loshkarev, E. Él'bert] Conclusions: 1. The modernized generators have a new rated power of 90 MW/105 MVA, which is 9.1% higher than their original power without any restrictions, with sufficient heating and vibration margins. 2. As the test data showed, the power of the generator modernized according to variant 1 can be increased to 100 MW (i. e., by 21% versus the original) and according to variant 2 up to 105 MW (i.e., by 27% versus the original). 3. Modernization made it possible also by using new materials and technologies to increase the efficiency of the generators by 0.15% with modernization by variant 1 and by 0.33% with modernization by variant 2. 4. With modernization by variant 2 (with replacement of the stator core) thanks to the use of modern cold-rolled steel the steel losses decreased by 100 kW and the excitation losses by 34 kW. 5. Thanks to using nonmagnetic elements in the end zone of the stator the additional losses decreased by 26 kW. 6. Modernization of ventilation made it possible to reduce the air flow rate from 84 to 74 m3/sec with unchanged heating of the generator components. In this case the ventilation losses for any of the variants of the generator decreased by 60-70 kW. Tests of the generators permit concluding a high effectiveness of modernizing the generators at the Plavinas hydrostation and expediency of continuing modernization of the next generators by variant 2, i.e., with replacement of the stator core and winding. As a result of such modernization it is possible to considerably increase the power of the units to 105 MW/123.5 MVA, in which case the efficiency of the generator increases compared with the generator modernized by variant 1 by 0.18%; the exciting power decreases simultaneously. In the case of modernization with complete replacement of the stator we can confidently predict reliable operation of the machines for the next 40-50 years, i.e., as newly installed. Plenum Publishing Corporation, 1997 Loshkarev V. aut Él'bert E. aut Hydrotechnical Construction Springer US 31/3(1997-03-01), 176-177 0018-8220 31:3<176 1997 31 10749 https://doi.org/10.1007/BF02767198 text/html Onlinezugriff via DOI 1 brief-communication jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02767198 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Loshkarev V. aut NATIONALLICENCE 700 1- Él'bert E. aut NATIONALLICENCE 773 0- Hydrotechnical Construction Springer US 31/3(1997-03-01), 176-177 0018-8220 31:3<176 1997 31 10749 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer