发电机运行状态对定转子径向振动特性的影响分析

ANALYSIS OF GENERATOR STATOR AND ROTOR VIBRATION CHARACTERISTIC UNDER INFLUENCE OF OPERATION CONDITION

分析隐极同步发电机定转子径向振动随发电机运行状态的变化规律。首先通过分析不同运行状态时发电机电磁关系、电枢反应特性,以及正常运行时作用于定子的脉振电磁力特性和作用于转子的不平衡电磁力特性,分别得到定子径向倍频振动和转子径向工频振动在励磁电流一定时随发电机有功功率的变化特征,以及有功功率一定时随励磁电流的变化特征。实测了SDF-9型隐极同步发电机定转子振动信号,与理论分析结果基本吻合。另一方面也揭示基于振动特征诊断发电机故障时,必须考虑发电机的运行参数和运行状态,否则其诊断结果在实际应用中是不完整的。

Stator and rotor vibration characteristics ofnonsalient synchronous generator for different operating conditions are analyzed. Firstly, the electromagnetism characteristics and armature reaction characteristics are calculated for different operating conditions, the frequency characteristics of pulsating electric magnetic force acting on the stator and imbalance electric magnetic force acting on the rotor are analyzed when the generator works normally. Then the changing characteristics, stator radial second frequency vibration and rotor radial fundamental frequency vibration due to the generator active power when the excitation current is constant, can be gotten. And the changing characteristics, due to the excitation current when the generator active power is constant, can also be gotten. Finally, the stator and rotor vibration of a type SDF-9 generator is measured in the laboratory to verify the theoretical analysis presented above. On the other hand, the conclusion can be drawn, which is the generator operation condition must be considered when generator fault is analyzed and diagnosed based on vibration characteristics, otherwise the diagnosis result will be incredulous.