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电网技术  2010 

带并联电抗器的特高压输电线路故障性质识别

, PP. 216-222

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Abstract:

输电线路发生瞬时故障时,故障点处会产生变化过程复杂的电弧。为了分析电弧非线性特性对故障相母线电压高频暂态信号的影响,利用EMTP-ATP软件中的Models模块,建立了一、二次电弧模型;利用离散小波分析,提取故障相信号的高频成分,并计算固定时间窗内细节部分的谱能量值。瞬时故障与永久故障时,谱能量的变化趋势存在明显的差异,因此可以将连续时间窗内谱能量比值之和作为判断故障性质的判据。大量的电磁暂态仿真程序(electromagnetictransientsprogram,EMTP)仿真及计算结果证明该判据可靠且有效的,适用于带并联电抗器的特高压输电线路。

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