大型隐极发电机定子单相接地故障定位新方法

Novel location method for stator single-phase grounding fault of large non-salient pole generator

发电机定子单相接地故障在生产过程中时有发生,如不能快速切除,对发电设备和电力系统都有较大的危害。提出了一种大型隐极发电机定子单相接地故障定位新方法,所提方法通过基波零序电压和故障相基波电势确定定子单相接地故障的位置,适用于中性点经高阻接地的发电机以及中性点不接地的发电机,且不依赖于注入式定子接地保护,所需要的故障信息较少,简单易行,可在现场推广应用。仿真数据和实际故障案例验证了所提方法的正确性。

Stator single-phase grounding faults of generator often occur in the production process.If the fault cannot be removed quickly,it will bring great harm to power generation equipment and power system.A novel location method for stator single-phase grounding fault of large non-salient pole generator is proposed,which can determine the location of stator single-phase grounding fault by power frequency zero-sequence voltage and power frequency voltage of fault phase.The proposed method is suitable for the generator with neutral point grounding via high resistance and the generator without grounding neutral point,and it does not rely on voltage injection type stator grounding fault protection.Because the proposed method needs less fault information,it is easy to operate and can be widely used in the field.Simulation data and actual fault cases verify the correctness of the proposed method.