三峡右岸发电机主保护配置方案设计研究总结

Research Summarization on Design of Main Protection Configuration Scheme for Hydro-generator of Three Gorges Right Bank Power Station

为给景洪等后续电站水轮发电机主保护的设计提供借鉴,对三峡右岸发电机主保护配置方案的设计研究进行了总结。通过细化三峡右岸发电机的故障特点来确定其典型故障特征,为主保护配置方案的优化设计明确了方向,同时也大大减少了计算的工作量。文中提出由“完全裂相横差保护+不完全纵差/完全纵差保护”构成“一横一纵”的初步格局,再经定量分析结果决定是否增设零序电流型横差保护,从而确定最终的主保护配置方案,这一设计思想将在偶数分支水轮发电机主保护的设计中继续得以验证和完善。

To provide design experience for Jinghong and other succeeding power stations, research summarization is given to the design of main protection configuration scheme for hydro-generator of Three Gorges Power Station. By seriously analyzing the fault feature of the Three Gorges generator, the typical internal faults of stator winding are found. The presented method directs the optimum design for main protection configuration scheme, which greatly reduces the computation workload and ensures the accomplishment of design program. Based on the primary configuration of one kind of transverse differential protection and one kind of longitudinal differential protection composed of complete split-phase transverse differential protection and incomplete or complete longitudinal differential protection, the calculated results act as a criterion whether the zero-sequence current transverse differential protection is accepted or not, thus determining the final main protection configuration scheme. Above quantitative and optimum design process will be verified and improved by a series of other large-sized generators with even branches.