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利用自由振荡频率识别的三相重合闸永久性故障判别

, PP. 124-130

Keywords: 电力系统,继电保护,输电线路,并联电抗器电流,三相自适应重合闸,自由振荡频率,最小二乘矩阵束算法

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Abstract:

针对三相重合闸永久性故障判别方法在单相接地故障时灵敏度不足的问题,提出识别并联电抗器零模电流自由振荡频率的永久性故障判别方法。线路故障且两侧断路器跳开后,由于线路电容和并联电抗器的储能,并联电抗器会出现自由振荡电流。利用最小二乘矩阵束算法获取并联电抗器电流的自由振荡频率。瞬时性故障时,线路零模网络与线模网络在电弧熄灭后停止能量交换,该自由振荡频率等于零模网络固有频率主频;永久性故障时,线路零模网络与线模网络通过故障端口进行能量交换,该自由振荡频率等于零模网络和线模网络固有频率主频的算术平均值。因此,通过计算自由振荡频率的数值即可实现永久性故障判别。EMTP仿真表明,该方法能有效识别永久性故障,且不受故障位置、过渡电阻的影响。

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