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| Discussion on over-standard treatment technology of stator vibration of super large hydrogenerator |
| YANG Fei1, XU Jingjun2* |
| 1. Sinohydro Bureau 7 Co., Ltd., Chengdu, Sichuan 611700, China; 2. School of Energy and Electrical Engineering, Hohai University, Nanjing, Jiangsu 211100, China |
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Abstract The stator of Nuozhadu Hydropower Station was taken as the research object. Aiming at the problem of the damage of generating components caused by long-term high-intensity vibration of large-scale hydrogenerator stator, the causes of unit vibration were analyzed from the aspects of stator stiffness, rotor out of roundness, turbine tail water pressure pulsation, etc. The maximum integrated stress of the present structure of the rotor bracket has approached to the allowable stress and the maximum thickness of the gasket added to the unit is determined to be 0.2mm. In the overhaul of the unit, the interference between the yoke and the rotor bracket is increased, the rotor roundness is adjusted statically outside the pit, and the dynamic adjustment is conducted in the pit, so that the air gap between the stator and rotor is uniform during the operation of the unit. Through the manual start-up, overspeed test, dynamic balance test and boost test after overhaul, it is found that the horizontal vibration of the stator frame both under no-load condition and under load operation after overhaul is greatly reduced, and the tightness between the yoke and the rotor bracket is increased, and the yoke state is more stable. The stability of stator horizontal vibration is about 91 μm, and the reliability of the equipment is greatly improved, which ensures the safe and stable operation of the unit.
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Received: 07 November 2019
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