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基于S变换的新型波阻抗方向继电器

, PP. 113-119

Keywords: 输电线路,波阻抗方向继电器,双阻抗圆,行波,S变换

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Abstract:

为提高行波保护的灵敏性与可靠性,提出一种基于S变换的新型波阻抗方向继电器。通过对正方向线路故障后初始行波特征的分析,定义方向继电器的背侧母线波阻抗。依据该阻抗及继电器正方线路波阻抗分别设置正、反方向阻抗圆,构成双阻抗圆的方向判据。利用S变换提取单频率的电压、电流初始行波,并计算出波阻抗,根据该阻抗在正、反方向阻抗圆内的位置判别故障方向。

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