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与汽轮发电机组相比,大型水轮发电机定子每相绕组的分支数较多,并且各组中性点连接的分支数也可能不同,使得其内部故障保护的性能存在一些差异。文中基于一台模拟大型水轮发电机内部结构和电气特性的模型发电机,采用动态模拟实验对其内部故障保护进行了研究,这些保护包括:完全纵差保护、不完全纵差保护、裂相横差保护和单元件横差保护。在发电机处于不同运行工况下,根据各种保护的动作情况、灵敏度和可靠性的分析和对比结果,对于水轮发电机的内部故障保护性能、主保护方案和保护应用方面均得出了一些有益的结论。
Compared with steam turbine generator, large hydro-generator stator windings per phase more than the number, and the neutral point of each group connected to the number of branches may be different, making the performance of its internal fault protection there are some differences. Based on a model generator simulating the internal structure and electrical characteristics of a large hydroelectric generator, dynamic simulation experiments are carried out to study the internal fault protection of the model generator. The protection includes full longitudinal differential protection, incomplete longitudinal differential protection, split phase Transverse protection and single component protection. Based on the analysis and comparison of the operation, sensitivity and reliability of various protections under different operating conditions, the internal fault protection performance of the hydroelectric generator, the main protection scheme and the protection application are obtained Some useful conclusions.