CAJ | 학술논문

变压器铁磁材料的激磁特性呈现非线性，这将导致在变压器合闸过程中产生励磁涌流现象。过电流保护往往反映单一的电流幅值特征而动作，当变压器合闸过程发生时，励磁涌流及邻近区域内的穿越电流均可能导致相关联的过电流保护误动。从序分量的角度出发，构建了一个可通过标志函数的大小和突变，区分故障与涌流的序分量标志函数。通过PSCAD/EMTDC仿真表明，该标志函数能够充分反映电网结构的变化，有效区分变压器励磁涌流和故障。将该标志函数应用于过电流保护上可以减小励磁涌流的影响。
변압기철자재료적격자특성정현비선성，저장도치재변압기합갑과정중산생려자용류현상。과전류보호왕왕반영단일적전류폭치특정이동작，당변압기합갑과정발생시，려자용류급린근구역내적천월전류균가능도치상관련적과전류보호오동。종서분량적각도출발，구건료일개가통과표지함수적대소화돌변，구분고장여용류적서분량표지함수。통과PSCAD/EMTDC방진표명，해표지함수능구충분반영전망결구적변화，유효구분변압기려자용류화고장。장해표지함수응용우과전류보호상가이감소려자용류적영향。
The excitation characteristics of transformer ferromagnetic material present nonlinearity, which leads to inrush current phenomenon in the process of transformer closing. Overcurrent protection often acts reflecting single current amplitude characteristic. When transformer closing, inrush current and through current in the neighboring region may cause correlative overcurrent protection malfunctions. This paper, from the view of sequence components, constructs a mark function. The mark function can distinguish fault and inrush current by its value and sudden change. The simulation by PSCAD/EMTDC tool shows that this function can reflect the changes of power network structure fully, and the function can distinguish transformer inrush current and fault effectively. The application of mark function to current protections can reduce the effect of inrush current on overcurrent protections.