基于四边形平行度识别变压器励磁涌流的方法  

Method of Identify Inrush Current Based on Degree of Quadrilateral Parallelism

作　　者：孙洋[1] 于超[2] 黄家栋[1] 

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071003 [2]保定供电局,河北保定071000

出　　处：《电力科学与工程》2010年第8期1-3,29,共4页Electric Power Science and Engineering

摘　　要：基于励磁涌流明显的奇异特征和内部短路电流近似正弦波的特点,提出一种利用四边形平行度来识别变压器励磁涌流的方法。当励磁涌流时,波形呈现出严重的上下及前后半波不对称,通过提取四边形的4个顶点,所构成的四边形很不规则,而变压器发生内部故障的情况,所构成的四边形则近似为平行四边形,所以通过平行度的大小可以有效区分变压器励磁涌流和内部故障。变压器各种运行情况的动模试验验证了所提方法的可行性和判据的正确性。A algorithm based on degree of quadrilateral parallelism is presented for distinguishing between inrush current and fault current.When transformer switches no load,the inrush current shows seriously asymmetry in upper and lower half-wave and also before and after the half-wave.By extracting the four vertices of quadrilateral,the quadrilateral formed quite irregular,while the case of normal internal fault,the quadrilateral is approximately a parallelogram.So inrush current can be distinguished by using the magnitudes of the degree of parallelism.Results of dynamic tests show that the proposed method is feasible and correct.

关 键 词：变压器 励磁涌流 内部故障 平行度 

分 类 号：TM41[电气工程—电器] TM77