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电网技术  2007 

网格分形在识别电流互感器饱和中的应用

, PP. 84-88

Keywords: 网格分形,直流闭锁法,变压器差动保护,形态滤波,电流互感器饱和

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Abstract:

分析了电流互感器饱和情况下变压器区内、外故障时差动电流的奇异特征,提出一种利用网格分形原理防止变压器差动保护误动的新方法,与自适应广义形态滤波器结合使用,可在抑制各种噪声和干扰的同时,完整保留信号的奇异特征。该方法不需要准确定位故障发生和差流出现的时刻,利用差流网格变化曲线的极大值与极小值平滑域的相对大小,通过设定合适的门槛值,能可靠识别变压器内部故障,且不受励磁涌流的影响,并能可靠识别转换性故障。动模试验结果证明了该方法的有效性和可行性。

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