偶数多分支发电机的主保护优化设计

通过分析多分支发电机的2种典型内部故障对不同主保护的灵敏性,从减少相对保护死区的目的出发提出了选择支路分组方式的2条一般性原则。按照这2条原则,在构皮滩、龙滩和紫坪埔发电机的主保护设计中,不需具体计算保护方案的灵敏度就可从众多选择中直接确定最优的支路分组方式,再由优化设计可得到保护动作率最大的最优配置方案,大大节省了设计工作量。分析结果表明,在偶数多分支发电机的主保护配置中,一般应优先考虑分成2个支路组。

Optimum Design of Main Protection Configuration Scheme for Internal Faults of Generator with Even Multi-branches

By analyzing two kinds of typical internal faults of whose sensitivity is mostly affected by the concrete constitute manner of main protection in multi-branch generator, two principles for grouping the branches are presented in order to reduce the relative dead region. According to the two principles, the branch combination modes are determined directly from many choices without calculating the sensitivities, and the optimal protection configuration scheme with the maximum protection range is worked out through limited workload in Goupitan, Longtan and Zipingpu generators. Analysis results indicate that two-group branches scheme should be primarily considered for main protection configuration of even multi-branch generators.