水轮发电机斜支臂结构转子支架裂纹分析

Analysis of rotor bracket cracks of oblique supporting arm structure for hydraulic turbine generator

低水头水轮机运行中水力因素的变化,会使发电机转子振动增大,易造成斜支臂结构转子支架产生裂纹。本文根据现场运行情况对裂纹转子进行数值计算,分析后确定裂纹转子可以继续维持运行,在运行一段时间后,对发电机稳定性及气隙参数进行分析,数据比较稳定,这也实际验证了转子支架裂纹数值分析的客观、正确性,这为合理选择时间安排转子检修提供了理论依据,在河流水情偏丰的汛期,也为企业带来了一定的经济效益。

Intensified rotor vibrations of a generating unit under the variation of hydraulic condition of low head turbine can easily cause cracking of the rotor bracket of oblique arm structure.Numerical calculation of the on-site unit operation in this study indicates the possibility and safety of unit running for a certain period after the rotor bracket was cracked,and an analysis of air gap for such generator verifies the stability of its operation and the numerical results of the cracked rotor bracket.This work would provide a basis for time scheduling of rotor maintenance and repair to improve economic benefits of power generation in flood season.