清江水布垭电站发电机定子绕组主保护分析

Analyzing stator windings main protection of generator for Qingjiang Shuibuya hydropower station

针对清江水布垭电站46万kW发电机定子绕组结构及其综合差动主保护方式动作行为进行计算分析和评价,重点阐述了定子绕组匝间故障及分支断线时保护动作的灵敏度,指出该主保护方式优于其他组合主保护方式,现有保护定值个别之处有待商榷,保护仍有死区,保护动作原因综合分析较复杂。该文对大型水轮发电机的故障分析有一定的借鉴作用。

For Qingjiang Shuibuya Hydropower Station 460,000 kW power generator stator windings structure and its integrated differential main protection, this paper carries out actions behavior analysis and evaluation. It focuses on protection sensitivity of the stator winding inter-turn faults and branches broken fault, and points out that the main protection is superior to other one and in existence the starting value of the individual worth discussing, there are still dead zone for the protection and a comprehensive analysis of the reasons for protection action is rather complicated. The paper has some value on the large-scale hydro-generator failure analysis.