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电网技术  2014 

地磁感应电流作用下的CT饱和特性及其引起的变压器差动保护误动

DOI: 10.13335/j.1000-3673.pst.2014.02.038, PP. 520-525

Keywords: 地磁感应电流(GIC),电流互感器(CT),饱和特性,变压器差动保护

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Abstract:

电流互感器(currenttransformer,CT)的饱和特性对继电保护的动作性能会产生重要影响。地磁感应电流(geomagneticallyinducedcurrent,GIC)在区域电网中具有高幅值、低频率、时变性等特点,它对CT饱和特性的影响与外部故障的穿越性电流、涌流中的非周期分量、高压直流输电引起的直流偏磁都不完全相同,值得引起人们的重视。根据GIC的典型波形特征构建GIC等效源模型,在PSCAD/EMTDC中对GIC作用下的CT饱和特性进行了仿真分析,并研究了与其相关的变压器差动保护受到的影响。研究结果表明,GIC可能导致CT的严重饱和,使CT二次侧电流的波形畸变特征消失,导致变压器差动保护计算出的不平衡电流增大,且差流中二次谐波含量很低,造成差动保护误动。针对该误动情况,可采用基于差流及其二次谐波含量趋势的措施来进行防范。

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