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电网技术  2014 

带并联电抗器同杆双回线跨线故障性质判别方法

DOI: 10.13335/j.1000-3673.pst.2014.07.044, PP. 2001-2007

Keywords: 同杆双回线,跨线故障,故障性质,模电压

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Abstract:

针对带并联电抗器的同杆双回线线路,在复频域上对故障相端电压进行详细分析,提出利用故障相β模电压进行故障性质判断的方法,其中β模电压为不同回线故障相电压平均值之差。以IABIIBC跨线故障为例进行仿真分析,综合得出利用故障相β模电压进行判断的结论,并给出了不同故障类型下的β模电压求解通式。瞬时性跨线故障下β模电压中既存在工频分量又存在自由频率分量;而永久性跨线故障下β模电压中只存在工频分量。通过利用最小二乘法提取其中自由频率分量幅值可以准确判断出故障性质,原理简单,灵敏度高。大量ATP仿真实验表明,该方法能够识别不同跨线故障类型的故障性质,可以应用于带并联电抗器同杆双回线的自适应重合闸。

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