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Effectiveness of modernizing the generators at the Plavinas hydroelectric station
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.
Effectiveness of modernizing the generators at the Plavinas hydroelectric station
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.
Effectiveness of modernizing the generators at the Plavinas hydroelectric station
Loshkarev, V. P. (author) / Él'bert, E. S. (author)
Hydrotechnical Construction ; 31 ; 176-177
1997-03-01
2 pages
Article (Journal)
Electronic Resource
English
Effectiveness of modernizing the generators at the Plavinas hydroelectric station
| Online Contents | 1997
Effectiveness of Modernizing the Generators at the Plavinas Hydroelectric Station
| British Library Online Contents | 1997