大型发电机定子接地保护灵敏度分析与整定计算

对大型发电机定子接地保护灵敏度进行了分析，提出了两段式发电机基波零序电压定子接地保护的概念：低定值动作发信号，高定值动作跳闸停机。并阐述了大型发电机定子接地保护的整定及各定子接地保护整定值的配合关系。通过发电机定子接地保护之间的相互配合，在整个发电机定子绕组范围内发生单相接地故障时，发电机定子接地保护均能灵敏地动作。

Analysis of the Sensitivity of Large-scale Generator Stator Ground Protection and Its Setting Calculation

This paper analyzes the sensitivity of large-scale generator stator ground protection, and proposes the concept of 2- section type of generator stator ground protection based on the zero sequence voltage of fundamental wave, i.e., the low setting for sending signal and the high setting to trip and shutdown. The setting of large-scale generator stator ground protection and the relation between various settings are described. Through cooperating each other between the generator stator ground protection, it can operate sensitively when single phase ground fault in whole range of generator stator winding occurs.