基于采样值差动的励磁涌流鉴别方法

针对目前微机变压器保护中普遍采用的利用２次谐波和间断角原理识别变压器励磁涌流的缺陷，提出利用采样值差动鉴别励磁涌流、分相制动的新原理。动模实验表明：该原理可较好地解决传统制动原理动作速度慢，受系统谐波影响大，对对称性励磁涌流鉴别困难等不利因素，且上有良好的可靠性。

A NEW METHOD TO IDENTIFY INRUSH CURRENT BASED ON SAMPLED VALUES

Aimed at the disadvantages of second harmonic restraint and dead angle restraint, a new method is presented in this paper to distinguish inrush current. The new theory is based on sampled values and can disable the relay by phases. The dynamic tests show that the new theory can preferably solve some problems of traditional restraint methods, such as operated slowly when the fault transformer is switched in without loads, affected by harmonic easily and can not identify the symmetrical inrush current. At the same time, the new method owns good reliability.