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电网技术  2009 

含分布式电源的配电网方向过流保护

, PP. 112-117

Keywords: 方向过电流保护,电流正序分量,相角差,分布式电源

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Abstract:

含分布式电源的配电网对继电保护装置的动作速度和保护范围提出了更高的要求。文章基于配电网电流正序分量相位的变化,提出一种方向过流保护方案,该方案首先利用故障前一周期和故障后一周期的电流正序分量相角差判定故障方向,然后通过比较三相电流绝对值间隔0.01s差分后的最大值和最小值之差来判断故障相别。推导了故障方向判据,以10kV馈线方向保护为例,说明了该保护方案的可靠性和灵敏度,并在双回配电系统中验证了该方案的有效性。

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