CAJ | 학술논문

变压器空载合闸或切除故障合闸都伴随着励磁涌流的出现，励磁涌流的大小受合闸角、剩磁、系统阻抗参数等因素的影响。提出了一种消除单相变压器励磁涌流的策略，利用预充磁装置改变变压器铁心中的磁通，当接近极限磁滞回线的剩磁时，控制断路器的合闸，从而消除励磁涌流。通过理论推导，确定了预充磁装置电容大小与电容电压之间的关系、铁心的充磁程度以及对应的相位。最后，以某单相变压器为例，利用Simulink仿真，验证了该策略。
변압기공재합갑혹절제고장합갑도반수착려자용류적출현，려자용류적대소수합갑각、잉자、계통조항삼수등인소적영향。제출료일충소제단상변압기려자용류적책략，이용예충자장치개변변압기철심중적자통，당접근겁한자체회선적잉자시，공제단로기적합갑，종이소제려자용류。통과이론추도，학정료예충자장치전용대소여전용전압지간적관계、철심적충자정도이급대응적상위。최후，이모단상변압기위례，이용Simulink방진，험증료해책략。
Energization of transformer both unload and removal of fault is accompanied with an inrush current, the value of which depends on the angle of the applied voltage, residual flux of the core, the impedance of system and so on. A strategy of eliminating the single-phase transformer inrush current is proposed, which refers to set the transformer residual flux to a known value which is equal to the flux when energization by a pre-magnetizing device, while decreases the inrush current. By theoretical analysis, the relationship between size of capacitor and the voltage, the degree of magnetization of the core and the corresponding phase are determined. Finally, in case of a single-phase transformer, the proposed strategy is verified by Simulink simulation.