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具有抗过渡电阻能力的多相补偿距离继电器

DOI: 10.13334/j.0258-8013.pcsee.2014.19.023, PP. 3220-3225

Keywords: 距离保护,过渡电阻,多相补偿距离继电器,单相接地故障,误差分析

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Abstract:

多相补偿距离继电器不受系统振荡影响,但抗过渡电阻能力差,为此,提出一种具有抗过渡电阻能力的多相补偿距离继电器。通过对多相补偿距离继电器动作方程的分析,找到了过渡电阻在该动作方程中的作用项。整定点的零序电压具有同该作用项极相似的形式。通过在动作方程中引入整定点的零序电压,同时用保护整定点的电压代替故障点故障前电压,可提取该作用项。进而利用线路阻抗角和该项的实虚部,可减小或消除过渡电阻对多相补偿距离继电器的影响。基于以上原理,提出一种具有抗过度电阻能力的多相补偿距离继电器。理论分析和仿真计算证明了所提继电器具有良好的抗过渡电阻能力。

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