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A method to identify inrush current based on waveform characteristics of differential current
Author(s): 
Pages: 19-24
Year: Issue:  6
Journal: Relay

Keyword:  transformer protectioninrush currentdifferential currentflux saturationwaveform characteristic;
Abstract: 提出了一种基于差动电流波形特征的励磁涌流和故障电流识别方法.励磁涌流的共同特征是受铁芯饱和程度的影响,差动电流是流过励磁绕组的实际电流,因而这一特征表现得更加明显.定义波形系数为磁通未饱和部分对应的电流在整个周期中所占比例,当系数大于阈值时判定为励磁涌流.为防止误动,当系数小于阈值时,引入“是否完全偏向时间轴一侧”作为辅助判据,使得该方法更加可靠.最后进行空载合闸仿真试验,证明了该方法能识别各种情况下的励磁涌流,性能优于二次谐波制动和间断角判据.
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