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On-site tests of a hydroelectric generator thrust bearing on a screw support
Conclusions According to the test results the axial load on the bearing exceeds the design load (11.5 MN). At the rated power of 150 MW the axial load on the bearing was 13.28 MN and the minimum film thickness, 40 μm; at the increased active power of the generator, 170 MW, the maximum load on the bearing segment was 13.88 MN, whereas the minimum thickness of the oil film remained as before. With respect to the temperature regime the state of the bearing at loads of 150 and 170 MW is regarded as the maximum permissible. Thus operation of the generator with a load 20 MW greater than the rated is permitted provided that the water temperature at the cooler inlet is not higher than 10.5° and the temperature of the ambient air (in the generator room) is not above 35°.As consequence of the small thickness of the oil film at the end of the first revolution, the unit should not be started after a 5-day shutdown without raising and lowering the rotor on brakes in a normal situation, but in emergency situations in the power system starting of the unit is permitted provided that soon after this the bearing is inspected.The unit can be started without raising the rotor on brakes after a shutdown of not more than 3 days provided that the temperature of the segments and oil in the bearing bath (before starting) is not below 20°.
On-site tests of a hydroelectric generator thrust bearing on a screw support
Conclusions According to the test results the axial load on the bearing exceeds the design load (11.5 MN). At the rated power of 150 MW the axial load on the bearing was 13.28 MN and the minimum film thickness, 40 μm; at the increased active power of the generator, 170 MW, the maximum load on the bearing segment was 13.88 MN, whereas the minimum thickness of the oil film remained as before. With respect to the temperature regime the state of the bearing at loads of 150 and 170 MW is regarded as the maximum permissible. Thus operation of the generator with a load 20 MW greater than the rated is permitted provided that the water temperature at the cooler inlet is not higher than 10.5° and the temperature of the ambient air (in the generator room) is not above 35°.As consequence of the small thickness of the oil film at the end of the first revolution, the unit should not be started after a 5-day shutdown without raising and lowering the rotor on brakes in a normal situation, but in emergency situations in the power system starting of the unit is permitted provided that soon after this the bearing is inspected.The unit can be started without raising the rotor on brakes after a shutdown of not more than 3 days provided that the temperature of the segments and oil in the bearing bath (before starting) is not below 20°.
On-site tests of a hydroelectric generator thrust bearing on a screw support
Dolgopolov, A. S. (author) / Kolesnikov, V. I. (author) / Rybkin, A. A. (author)
1981
Article (Journal)
English
BKL:
56.30
Wasserbau
Local classification TIB:
770/6550/8000
On-site tests of a hydroelectric generator thrust bearing on a screw support
| Springer Verlag | 1981
Failure analysis of hydro-generator thrust bearing
| British Library Online Contents | 1999