主变压器中性点间隙击穿引起的跳闸故障分析

Analysis of Tripping Fault Caused by Breakdown of Neutral Point Gap of Main Transformer

文章对变压器中性点间隙击穿引起的跳闸故障进行分析,内容包括发生故障过程中,主变电压器中性点暂态过电压,以及发生故障过程中零序保护整定值,进而根据分析结果,提出调整保护动作时间、增加大中性点间隙大小的相关建议,最终保证相关的接地系统在进行非全相运行过程中,保护不动作,对主变电压器形成良好的保护,促使其中性点绝缘不会遭受到雷击的破坏。

This paper analyzes the fault caused by a single-phase line fault in the breakdown fault of the transformer neutral point gap.The main analysis contents include the transient overvoltage of the neutral point of the main transformer in the process of fault and the zero sequence protection setting value in the process of fault.Then according to the analysis results,it puts forward to adjust the protection action time and increase the large neutral point Finally,relevant suggestions on gap size can ensure that the relevant grounding system will not act in the process of non full phase operation,and form a good protection for the main transformer voltage,so as to ensure that the neutral point insulation will not be damaged by lightning.