同步发电机定子内部故障暂态过程及对保护的影响

TRANSIENT SIMULATION OF STATOR WINDING INTERNAL FAULTS IN SYNCHRONOUS GENERATOR AND ITS IMPACT ON PROTECTION

利用基于多回路法的凸极同步发电机定子绕组内部故障暂态过程仿真程序,讨论了定子支路电阻和阻尼支路电阻对故障暂态过程及稳态的影响,分析了同步发电机并网运行时定子绕组故障暂态过程中的单元件横差保护、裂相横差保护、完全纵差保护和不完全纵差保护的灵敏度,认为对于没有制动电流的单元件横差保护灵敏度在暂态过程中得到了提高,但对有制动电流的裂相横差、完全纵差和不完全纵差保护的灵敏度则需要具体分析。

Based on the transient simulation program of stator winding internal faults in synchronous generator, this paper presents the effect of stator winding and damper bar resistance on transient and steady currents. It also analyzes the sensitivities of unit-transverse differential protection, split-phase transverse differential protection, differential protection and incomplete differential protection in stator winding internal faults transient period when the synchronous generator is connected to system. The analytical results show that the sensitivity of unit-transverse differential protection can be improved in the transient period, and the sensitivities of split-phase transverse differential protection, differential protection and incomplete differential protection may change a lot on different fault conditions.