发电机失磁保护阻抗元件定值整定的再讨论——对2007年版《IEEE Guide for AC Generator Protection》的斟酌

发电机失磁保护阻抗元件定值整定中,始终存在防误动和加速动作的矛盾.根据理论分析和运行实践,认为解决矛盾应从阻抗平面的R轴方向扩大阻抗动作区,即将理论上的汽轮发电机静稳边界功角90°,减小为实用的静稳边界功角55°～65°,与此同时,增设无功反向元件.从-X轴方向扩大动作区,以求加速失磁保护动作的做法,缺乏理论依据且欠有实效.

Re-discussion of setting calculation for impedance element of generator loss-of-excitation protection: thinking of IEEE Guide for AC Generator Protection 2007

There is always contradiction between mis-operation and acceleration in the setting calculation of impedance element for generator loss-of-excitation protection.According to theoretical analysis and operation practice,the way to solve it is the extension of operational area along R axis in impedance plane,i.e,the decrease of steady-state stability limiting power angle from 90℃(theoretic) to 55℃～65℃(practical) and the addition of a reverse reactive power element at the same time.The way of extension of operational area along -X axis to accelerate the impedance element is theoretically ineffective and practically infeasible.