主变中性点倒闸操作过程中零序保护、间隙保护投退研究  

Research on the Switching of Zero Sequence Protection and Gap Protection in the Process of Main Transformer Neutral Point Switching Operation

作　　者：梁斌 孙燕 Liang Bin;Sun Yan(Ordos Electric Power Bureau,Inner Mongolia Ordos 017000)

机构地区：[1]鄂尔多斯电业局,内蒙古鄂尔多斯017000

出　　处：《电子质量》2021年第6期118-120,共3页Electronics Quality

摘　　要：在直接接地系统中,当变压器中性点直接接地时,零序电流保护作为接地短路故障的后备保护;当中性点经间隙接地时,间隙保护作为接地故障的后备保护。以直接接地系统220 k V主变为例,分析了主变中性点倒闸操作过程中,造成接地短路故障的后备保护不启动的原因。总结了主变中性点倒闸操作过程中,间隙保护和零序保护的正确投退方法,用以避免主变倒闸操作过程中出现接地短路故障后备保护不启动的不利情况,可供变电运维人员参考。In the direct grounding system,when the neutral point of the transformer is directly grounded,the zero sequence current protection is used as the backup protection for the grounding short circuit fault;When the neutral point is grounded through the gap,the gap protection is used as the backup protection of grounding fault.Taking 220 kV Main Transformer as an example,analyze the reasons of the Miss Operation of Backup Protection for Transformer Earth Faults,in the switching operation of the main transformer.In order to avoid the Miss Operation of Backup Protection for Transformer Earth Faults.And we summarizes the matching method of zero sequence and gap protection in the neutral point switching operation of main transformer in the switching operation of main transformer neutral point.It can be used as a reference for transformer substation operation and maintenance personnel.

关 键 词：主变中性点 零序保护 间隙保护 投退方法 

分 类 号：TM774[电气工程—电力系统及自动化]