一种变压器励磁涌流识别新方法  

A New Method for Magnetization Inrush Current Identification of Transformers

作　　者：孙洋[1,2] 黄家栋 

机构地区：[1]四川省电力公司超高压运行检修公司,成都610065 [2]华北电力大学电力系统保护与动态安全监控教育部重点实验室,河北保定071003

出　　处：《南方电网技术》2010年第6期85-88,共4页Southern Power System Technology

摘　　要：基于变压器在空投或故障情况下磁通频域特征的不同,提出一种利用磁通对电流导数中偶次谐波制动比来判别励磁涌流和故障电流的新方法。研究发现故障时磁通对电流导数中偶次谐波成分明显高于奇次谐波成分,而涌流时不会出现这种情况,因此,可以通过偶次谐波制动比的大小来识别励磁涌流和故障。该方法具有较高的灵敏度和可靠性,在动模试验中对轻微匝间故障也有足够的灵敏度,且不需要任何先验参数。Based on difference of frequency-domain characteristics of flux betweem the cases of switched on-energized transformer and its fault occuring,and with the restraint ratio of even harmonics of flux-current derivative,this paper proposes a new method for magnetization inrush current idetification.The value of even harmonics are found in this study to be much higher than that of odd harmonics in flux-current derivative when internal fault occured,but not the case to inrush current,and thus it is possible to identify inrush current or fault current according to the magnitude of even harmonics.The proposed method is of high sensitivity and reliability,works even to low level turn-turn faults in the experimental test,and no priori parameters are required at all.

关 键 词：变压器 励磁涌流 内部故障 偶次谐波 奇次谐波 

分 类 号：TM41[电气工程—电器]