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根据水轮发电机定子和转子的绕组结构 ,在利用多回路理论计算定子和转子绕组电感参数的基础上 ,考虑定子绕组对地电容的分布性 ,建立了新的水轮发电机定子绕组单相接地故障暂态仿真模型 ,将定子绕组单相接地问题的研究统一在一个模型之中。文中以三峡发电机的一种设计方案为例 ,分析了定子绕组对地分布电容对模型的影响 ,讨论了单相接地过程中机端与中性点处零序电压及接地故障电流随故障位置和接地电阻的变化关系。该模型适合发电机定子绕组单相接地故障的全过程仿真 ,可为单相接地故障继电保护方案的分析与开发提供基础
According to the winding structure of hydro-generator stator and rotor, based on the multi-loop theory, the stator and rotor winding inductance parameters are considered, the distribution of stator winding to ground capacitance is considered, and a new single phase stator winding of hydroelectric generator Earth fault transient simulation model, the study of stator winding single-phase grounding in a unified model. Taking a kind of design scheme of Three Gorges Generator as an example, the influence of distributed capacitance of stator winding to ground on the model is analyzed. The relationship between zero sequence voltage and ground fault current at terminal and neutral point during single phase grounding is discussed. And the grounding resistance changes. The model is suitable for the whole process simulation of generator stator winding single-phase ground fault and can provide the basis for the analysis and development of single-phase ground fault relay protection scheme