110 kV主变差动保护误动原因分析  

Analysis of Misoperation Cause of 110 kV Main Transformer Differential Protection

作　　者：周文勇 程国萍 ZHOU Wenyong;CHENG Guoping(Wenshan Malipo Power Supply Bureau of Yunnan Power Grid Co.,Ltd,Yunnan Wenshan 663000,China)

机构地区：[1]云南电网有限责任公司文山麻栗坡供电局,云南文山663000

出　　处：《电工材料》2022年第4期67-69,共3页Electrical Engineering Materials

摘　　要：110 kV变电站低压侧一回出线发生三相短路故障,线路保护和重合闸依据整定运行规则正确可靠动作,但在重合闸重合于永久性故障且线路保护正确动作切除故障的情况下,主变差动保护误动,造成上网功率减小。Three-phase short-circuit fault occurred in the low-voltage side primary line of 110 kV substation,and the line protection and reclosing acted correctly and reliably according to the setting operation rules.However,when reclosing was coincident with permanent fault and the line protection acted correctly to remove the fault,the main transformer differential protection misoperated,resulting in reduced online power.

关 键 词：变电站 瞬时电流速断 重合闸 CT饱和 保护误动 

分 类 号：TM773[电气工程—电力系统及自动化]