一起线路故障引起多台主变间隙保护动作跳闸事故的分析

摘要

In order to limit the short-circuit current, and to ensure that the size and distribution of the zero sequence current in the system is not affected by the operation mode of the system, when the single-phase grounding fault and the neutral point is lost, the neutral point of the transformer will be zero sequence voltage or zero sequence current. In this paper, we analyze the causes of the protection action of the main transformer gap protection action caused by the fault of the main transformer and the protection of the ground fault.%为了限制短路电流,并保证系统中零序电流的大小和分布不受系统运行方式变化的影响,当电网发生单相接地故障且失去中性点时,不接地的变压器中性点将出现零序电压或零序电流.针对一起线路接地故障造成的主变间隙保护动作跳闸事故,分析了该间隙保护动作的原因,并对间隙保护相关的整定和配合的问题进行了探究.