磁通制动原理在变压器差动保护中应用

变压器差动保护的关键问题是判别变压器差动电流是励磁涌流还是故障电流。介绍了一种新型的利用变压器励磁特性的励磁涌流判别方法——磁通原理算法，该算法只用差流的上升沿或下降沿计算，且用采样值直接进行计算，因此计算量小，简单可靠，解决了差动保护动作速度上的问题。将其应用到工程实践中，证实了其可行性?

Application of flux restraint theory in transformer differential protection

It is essential to distinguish excitation inrush from fault current in transformer differen-tial protection. Flux theory algorithm,a new method based on transformer excitation characteristics,is introduced. It applies directly the sample data to calculate only the rising edge or falling edge. Therefore,the method is simple with less calculation,which increases the action speed of differen-tial protection. The practice in project shows its feasibility.