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一种新型电流极性比较式方向元件

DOI: 10.13334/j.0258-8013.pcsee.2015.06.014, PP. 1399-1405

Keywords: 方向元件,极性比较,故障前电流,故障分量电流

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Abstract:

为克服电容式电压互感器(capacitorvoltagetransformer,CVT)暂态传变特性差对行波极性比较式方向元件可靠性和灵敏性的影响,提出一种工频电流量极性比较式方向元件。该元件利用故障前电流和故障分量电流之间的极性关系来确定故障方向。由于所提方向判据与故障电压量无关,因此从原理上避免了CVT暂态传变特性对方向元件可靠性和灵敏性的影响。基于PSCAD/EMTDC的仿真结果表明,该元件能够快速可靠地确定故障方向,其性能不受故障初始角、过渡电阻、噪声和负荷状态的影响。

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