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为了研究转子偏心对大型水轮发电机单元件横差保护的影响,采用多回路分析与有限元分析相结合的方法,建立了转子偏心下水轮发电机的数学模型,对发电机内部磁场进行有限元计算,得到了发电机在转子偏心下的电磁参数,然后通过多回路分析计算,获得了不同转子偏心率下单元件横差电流。计算结果表明,转子偏心故障达到一定程度时,单元件横差不平衡电流会超过保护动作定值,引起单元件横差保护的动作。
In order to study the influence of rotor eccentricity on the transverse differential protection of single hydro-generator unit, the mathematical model of rotor hydrogenerator under hydroelectric generator was established by combining multi-loop analysis and finite element analysis The electromagnetic parameters of the generator under the rotor eccentricity were obtained. Then the multi-loop analysis and calculation were carried out to obtain the current difference of the element under different rotor eccentricity. The calculation results show that when the rotor eccentricity failure reaches a certain level, the imbalance current of single component will exceed the setting value of protection action, causing the protection of single component transverse differential.