再谈大中型水轮发电机主保护定量化设计的必要性

Reconsideration on the Necessity of Quantitative Design of Main Protectionfor Large and Medium Hydro-Generator

大中型水轮发电机主保护的定量化设计方法已在三峡、龙滩、拉西瓦、小湾等水电厂得到了应用。随着研究设计工作的深入和工程实践经验的总结,又提出了主保护的定量化及优化设计方法。文中分析了水轮发电机绕组形式对故障特点的影响,归纳总结了典型故障特征,但这种归纳只是为简化设计计算的工作量指明了方向。由于大中型水轮发电机绕组形式的多样性,因此现阶段还难以仅凭发电机的故障特点就决定中性点侧引出方式和主保护的配置方案,而应在全面内部短路分析计算的基础上,再经定量化的设计过程来完成。

The quantitative design method has been applied to Three Gorges, Longtan, Laxiwa and Xiaowan generators for main protection configuration scheme, which contributes to the scitific decision of main protetion scheme for large and medium hydro-generators. By deeply studying the design rules and summarizing the engineering experiences, the optimum design method of main protection configuration scheme has been presented, which directs the reduction of computation workload and ensures the accomplishment of design effort. Because of the variety of stator winding type of large and medium hydro-generator, it is difficult to decide the final main protection configuration scheme only by the internal fault features of hydro-generator. At the present time, the main protection configuration scheme for large and medium hydro-generator should be acquired by the quantitative design process, which is based on the complete calculation of possible internal faults in the stator winding.