【摘要】 水轮发电机的定子绕组形式非常灵活,叠绕组和波绕组均可能被采用。出于抑制转子偏心振动的考虑,近期多台大型水轮发电机采用叠绕组或改用同属集中布置的半波绕组,但其主保护性能令人担忧。运用发电机主保护定量化及优化设计方法,在全面定量分析的基础上,对高、低转速叠绕组发电机的内部故障特点与主保护性能进行了分析对比,指出高转速发电机采用叠绕组能够取得电机设计和主保护设计"双赢"的目标,但对于低转速发电机应慎用,可能导致保护死区的显著扩大,且不能动作故障类型的发生概率较高,不利于发电机的安全稳定运行。更多还原

【Abstract】 The stator winding of hydraulic generator is flexible and can be lap winding or wave winding according to the engineering experience.In order to restrain the generator’s vibration attributed to rotor eccentricity,lap winding or centralized arrangement wave winding is adopted by a series of large-sized hydraulic generators recently,but their main protection performance is harmful to the generators’ safe operation.By using the quantitative and optimal design methods of main protection for large-sized hydraulic generators,internal fault feature and main protection performance of lap winding generators with different rotational speeds are analyzed and compared based on the overall quantitative analysis.New suggestions on stator winding design of large-sized hydraulic generators are presented in this paper,they are,firstly,selecting lap winding for the hydraulic generator with high rotational speed can meet the requirements of electric machine design and relaying protection simultaneously;and secondly,above stator winding type used for the hydraulic generator with low rotational speed may lead to the remarkable increase of non-operation faults, which needs to be further investigated.更多还原