中文摘要：

分析了目前变压器励磁涌流识别方法存在的不足。在总结正常空载合闸、带故障空载合闸和内部故障状态下差动电流各个特征量取值特点的基础上,提出一种在特征空间综合多特征识别励磁涌流的方法。该方法首先在特征空间中设置针对上述3种运行状态的参考点,然后根据待识别差动电流与各参考点间距离的远近对运行状态进行识别。该方法能够有效利用各个特征间的互补性,且无需设定权重,并可方便地增加新特征。将带故障空载合闸状态从故障状态中分离出来单独作为一种参考状态,有利于提高带轻微故障空载合闸时的保护的灵敏性和快速性。仿真结果表明了所提方法的正确性和有效性。

英文摘要：

The shortages of present transformer inrush identification methods are analyzed,the characteristics of differential currents under the conditions of switch-on without load,switch-on with fault and internal fault are summarized in detail,and a synthetic identification method is presented based on the multiple characteristics in characteristic space.The reference points in characteristic space are fixed for three typical operating conditions and the differential current is then identified according to its distances from the reference points.It makes full use of the complementarity among different characteristics,avoids the weight setting and adopts new characteristic conveniently.As a reference condition,the switch-on with fault is separated from other fault conditions to increase the sensitivity and rapidity of protection under slight fault condition.Simulative results verify its correctness and validity.