龙滩发电机主保护配置方案

大型发电机内部故障主保护配置方案需要通过定量化设计来确定。对于多分支的水轮发电机,可以采用多种中性点引出方式,相应主保护的构成方式和组合方案数目巨大,很难通过"穷举法"获得最优的配置方案。文中通过分析龙滩发电机绕组结构和内部故障的特点,发现适当地选择中性点引出方式可以减小保护死区,从而大大减小了设计工作量。在此基础上,对龙滩发电机进行了主保护配置方案的定量化设计,最终提出了保护范围大、双重化程度高、工程上也易于实现的配置方案。

Research on the Main Protection Configuration Scheme for Internal Faults of Longtan Generator

The final main protection configuration scheme for internal faults of large generators should be determined by means of quantitative design. Since a multi-branch hydro-generator could adopt many modes of neutral-point lead, its main protection configuration has a large number of constitute manners and compound schemes. Hence it is extremely difficult to find the optimal protection scheme for large generators with multi branches, such as Longtan Generator, by enumeration method. When the characteristics of stator windings and internal faults of Longtan Generator are analyzed, it is found that the dead region could be deduced by right choice of the mode of neutral-point lead. Through quantitative design, a protection configuration scheme with the largest protection range and higher degree of double-protection is presented in this paper, which can be easily realized in fields.