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ÎÄÕ±àºÅ£º1006-0316 (2022) 08-0001-06

Analysis and Treatment of Excessive Vibration of Stator Frame in a Hydropower Station

WANG Shengjun1,2£¬WANG Weiyu1,2£¬LIU Bin1

( 1.Wuling Power Corporation Ltd., Changsha 410004, China; 2.Hydropower Industry Innovation Center of State Power Investment Corporation Limited, Changsha 410004, China )

Abstract£ºStator frame is one of the main components of hydro turbine generator unit. The excessive vibration of the stator frame will affect the air gap of the generator and the electromagnetic stability of the unit. In severe cases, the unit will be forced to shut down, which has a significant influence on the safety and stability of the unit and the economic benefits of operation. Aiming at solving the problem of the abnormally large horizontal vibration amplitude of the stator frame of unit 3 in a power station, this paper analyzes the causes and proposes the treatment measures. Firstly, based on the comparative analysis of the vibration data before and after the generator is excited, it is found that the increase of excitation current leads to the increase of electromagnetic tension and the imbalance of electromagnetic tension. Secondly, through the analysis of vibration spectrum, it is found that the frequency components causing the increase of stator X-direction vibration amplitude are 2, 3 and 4 times frequency. These characteristics determine that the non-circular stator and rotor may be the causes. Finally, during the maintenance, it is found that the fixing bolts of the stator frame are loose. After checking and handling the bolts and stop blocks of the stator frame, the problem of excessive vibration of the stator base is solved. The cause analysis and treatment measures for excessive vibration of stator frame  provide reference for solving similar problems. 

Key words£ºhydropower unit£»stator frame£»electromagnetic vibration£»electromagnetic tension

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