基于等效瞬时电感参数辨识的变压器励磁涌流判别方法  

Distinguishing magnetizing inrush based on characteristic of equivalent instantaneous inductance

作　　者：朱可[1] 姜杰[1,2] 张太勤 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044 [2]重庆新世纪电气有限公司,重庆400030

出　　处：《电力系统保护与控制》2010年第20期12-16,共5页Power System Protection and Control

基　　金：国家'111'计划项目(B08036)

摘　　要：利用变压器空投后5ms的原边数据对变压器等效瞬时电感进行参数辨识,根据空投时正常变压器磁通未饱和前等效瞬时电感较大而故障变压器等效瞬时电感较小这一特征构成变压器保护原理,并提出了保护判据,即等效瞬时电感辨识值小于整定值时判定为变压器空投于内部故障,否则判定为正常空投。该方法无需知道空投变压器副边电压数据,充分考虑了现场运行中变压器空投时副边数据不易获取的实际情况。EMTP数字仿真与动模试验结果表明了该方法的正确性与有效性。Utilizing the primary-side data in 5 ms after no-load transformer is closed to identify the parameter of equivalent instantaneous inductances.The transformer protection principle is formed according to the characteristic that when no-load transformer is closed,the equivalent instantaneous inductance of normal transformer is comparatively large before flux being saturation while the fault transformer＇s equivalent instantaneous inductance is comparatively small,and a novel transformer protection criterion is proposed,that is when the value of equivalent instantaneous inductances is smaller than the setting value,it＇s judged as a transformer with fault,otherwise as a normal transformer.This method does not need the secondary voltage data of the no-load transformer and fully considers the difficulties of obtaining the data in field operation.Simulation results and experimental results of real transformer verify validity and effectivity of the method.

关 键 词：变压器 等效瞬时电感 参数辨识 内部故障 励磁涌流 

分 类 号：TM407[电气工程—电器]