中文摘要：

为了研究发电机过电压保护设定值在灭磁过程中对发电机本体及其关联设备的影响，本文通过发电机端口电压得到发电机所需励磁电流，考虑发电机电感负载，分析了电机中旋转整流器的换相过程，得到励磁机励磁电流、励磁磁势及旋转整流直流侧电压表达式。在对无刷励磁机以及发电机的分析基础上，研究了发电机关联整流器晶闸管封脉冲，励磁机紧急灭磁的暂态过程，为发电机及关联整流器设计或相关保护器件的选择提供了理论指导。

英文摘要：

In order to study the influence of generator and its associated equipment by set value of generator overvoltage protection during de-excitation process,through the excitation current obtained by generator port voltage and considering the generator inductance load,rotary rectifier commutation process is analyzed and excitation current,excitation magnetic potential and rotating rectifier DC side voltage expression are gotten.Based on the analysis of the brushless exciter and the generator,the transient process of the thyristor seal and the excitation of the exciter are given,which provides the theory for the selection of generator and associated rectifier design or related protection device.