一种变压器励磁涌流与故障电流的鉴别方法  

A Method of Inrush Current Identification Based on Engineering Application

作　　者：王婷[1] 张侃君[1] 李茗[2] 舒欣[1] 林志伟[1] 雷杨[1] 

机构地区：[1]国网湖北省电力公司电力科学研究院,湖北武汉43007 [2]国网湖北省电力公司检修公司,湖北武汉430050

出　　处：《湖北电力》2014年第4期20-23,共4页Hubei Electric Power

摘　　要：空载投运变压器跳闸后,快速、有效判别跳闸原因并采取相应措施,不仅可以避免对变压器及相关主设备的损坏,而且可缩短变压器的投运时间。本文从工程的角度,提出了一种变压器励磁涌流的鉴别方法,该方法原理包括:判别变压器空载投运时电源侧三相电流波形特征,包括波形形状、是否有间断角以及三相波形间的关系等;在工程现场有条件的情况下,计算变压器差动电流的二次谐波含量。文中采用工程实际案例,对该方法进行验证。验证结果表明,该方法可快速鉴别励磁涌流与故障电流,易于实施,具备较好的工程应用价值。After the no-load transformer is put into operation tripping,we should rapid identification of trip reason and take appropriate measures.It can avoid the damage of transformer and related main equipment,and also can shorten the operation time of the transformer.In this paper,a method of inrush current identification is put forward from the view point of engineering.This method include:1)Identification waveform characteristic of high voltage side three phase current after the no-load transformer is put into operation,including corrugated shape,whether there is a discontinuous Angle and the relationships between three-phase waveform,etc.2)If having suitable condition at project site,we can calculation second harmonic content of the transformer differential current.In this paper we use a actual example to confirms this method.The results show that this method can quickly identify the difference between the inrush current and fault current,easy to implement.It has a good processing effect.

关 键 词：变压器 空载投运 励磁涌流 故障电流 

分 类 号：TM407[电气工程—电器]