基于绕组分布的大型汽轮机组定子接地故障定位方法

Novel Fault Location Method of Large Steam Turbine Generator Stator Grounding Considering Winding Distribution

定子接地故障是大型发电机组最为常见的故障类型,若能快速有效地定位绕组接地故障位置,对于加快机组检修进度、推进机组恢复供电具有重要价值。为此,提出一种基于绕组分布的大型汽轮机组定子单相接地故障定位方法,从大型机组定子单相接地时的故障特征及绕组电势分布的影响分析出发,构建机组绕组的零序电压所满足的幅值方程和相位方程,并结合机组定子绕组电势分布的解析表达,提出通过数值求解快速定位故障位置的方案。仿真分析结果验证了该方法的有效性。

Stator grounding is the most common fault of large generator.If the accurate coil of the fault can be located quickly and effectively,the maintenance progress of the generator can be greatly speed up,and the fault generator can be put back into use as soon as possible.For this purpose,a stator grounding fault location method for large steam turbine generator is proposed,which takes the distribution of winding potential into account.Firstly,the fault characteristics and the influence of winding potential distribution are analyzed when single-phase ground fault occurs in large generator,and the amplitude equation and phase equation of zero sequence voltage are constructed.On this basis,the potential distribution of stator winding can be analytically expressed,so the fault location can be directly calculated by numerical solution method.Simulation analysis result verifies the effectiveness of the proposed method.