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变压器和应涌流产生机理及其特性分析
武万才, 边 疆, 吴志勇
宁夏电力公司 吴忠供电局,宁夏 吴忠 751100
摘要:
变压器在空载合闸或外部故障切除后电压恢复时在相邻变压器产生和应涌流,易引起相邻变压器差动保护和后备保护误动现象。基于磁链变化角度总结了和应涌流的产生机理,分析了和应涌流的波形特征及其变化特点。通过对2台单相变压器并联运行时1台空载合闸的分析和仿真,验证了和应涌流的产生机理,得出端口电压的变化使变压器磁链(磁通)发生变化,导致饱和程度发生变化是产生和应涌流的根本原因。最后提出了和应涌流的特性,并指出三相变压器空载合闸时,三相涌流中有一相为对称性涌流,得出和应涌流的变化特性以及变压器两侧电流中谐波分量衰减不一致是造成变压器差动保护误动的主要原因。
关键词:  变压器  和应涌流  励磁涌流  电力系统保护  机理  特性
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Principle and characteristics of transformer sympathetic inrush
WU Wancai, BIAN Jiang, WU Zhiyong
Wuzhong Electric Power Bureau of Ningxia Electric Power Company,Wuzhong 751100,China
Abstract:
The switch-on of an electric transformer without load or the voltage recovery after its external fault is removed will induce the sympathetic inrush in its adjacent transformer,which may result in the misoperation of differential protection and back-up protection of the adjacent transformer. Based on the flux variation,the principle of sympathetic inrush generation is summarized and its characteristics in waveform and variation are analyzed. Simulation with two single-phase transformers demonstrates that,the flux variation caused by the terminal voltage change induces the sympathetic inrush. It is pointed out that,one of three phase sympathetic inrushes is symmetry when three-phase transformer is switched on without load and the difference of harmonic current decay between two sides of transformer causes the misoperation of differential protection.
Key words:  electric transformers  sympathetic inrush  magnetizing inrush  electric power system protection  principle  characteristic

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