PST-1200U差动保护励磁涌流判据失效原因分析及改进  

Analysis and improvement on the failure of block of magnetizing inrush current criterion in PST-1200U

作　　者：王婵媛 孔茗 WANG Chanyuan;KONG Ming(Danyang Power Supply Company,State Grid Jiangsu Electric Power Co.,Ltd,Zhenjiang,Jiangsu 212000;Zhenjiang Power Supply Company,State Grid Jiangsu Electric Power Co.,Ltd,Zhenjiang,Jiangsu 212000)

机构地区：[1]国网江苏省电力有限公司丹阳供电分公司,江苏镇江212000 [2]国网江苏省电力有限公司镇江供电分公司,江苏镇江212000

出　　处：《电气技术》2024年第11期81-84,共4页Electrical Engineering

摘　　要：基于波形对称原理的PST—1200U系列变压器保护装置存在内部门槛值,当励磁涌流二次值低于装置的门槛值时,保护装置不对其进行励磁涌流判别,按一般差流处理,如果差动保护启动定值小于门槛值,会形成励磁涌流闭锁“死区”,导致差动保护误跳开关。本文通过分析励磁涌流闭锁“死区”产生的原因,给出相应解决方案并通过现场试验和实际空投变压器加以验证。The PST-1200U series transformer protection device based on waveform symmetry principle has an internal threshold value.When the secondary value of excitation inrush current is lower than the internal threshold value of the device,the protection device does not distinguish it from the excitation inrush current and treats it as a general differential current.If the startup setting of differential protection is less than threshold value,it will form a blocking“dead zone”for excitation inrush current,leading to differential protection false tripping of the switch.This article analyzes the reasons for the blocking“dead zone”of excitation inrush current,provides corresponding solutions and verifies them through on-site tests and actual airdrop transformers.

关 键 词：差动保护 励磁涌流 波形对称制动 门槛值 

分 类 号：TM774[电气工程—电力系统及自动化]