三峡电站水轮发电机主保护设计回顾与展望

Review and Prospect of Main Protection Design for Hydro-Generators of Three Gorges Power Station

在总结三峡左岸电站发电机主保护设计运行成功经验的基础上,对三峡右岸发电机通过全面的内部短路分析计算、定量化的设计过程完成了主保护配置方案的设计,保护方案性能优异。所提出的由“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的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,为大型发电机组的安全运行提供可靠的保证。

By summarizing the engineering experiences of Three-Gorges Left Bank Power Station, the mare protection configuration scheme for hydro-generators of Three Gorges Right Bank Power Station is acquired through overall internal fault simulation and quantitative design process to satisfy the protection performance. Based on the primary configuration of one kind of transverse differential protection and one kind of iongitudinal differential protection composed of complete split - phase transverse differential protection and incomplete or complete iongitucdinal differential protection, the calculated results act as a criteri whether the zero - sequence current transverse differential protection is accepted or not, thus determining the final mare protection configuration scheme. Above quantitative and optinum design process will be verified and improved by a series of other lar-ge - sized generators with even branches. It is helpful to supply reliable assurance for the safe operation of large generators.