多台变压器空载合闸励磁涌流及其抑制方案的研究

以单台变压器合闸励磁涌流原理为基础,结合变压器在实际操作中的情况,进一步研究多台变压器的合闸涌流。根据多台变压器空载合闸的特点提出了增加系统阻抗和串联电容器的方法。通过对比增加系统阻抗后变压器之间磁链变化分析了其对励磁涌流的影响并介绍了选择最佳阻抗值的方法。最后结合仿真软件Matlab仿真了多台变压器同时合闸的励磁涌流并与加载单一电阻方案和电阻加电容器方案的励磁涌流大小进行对比。仿真结果表明,这种抑制方案有效地抑制了多台变压器的励磁涌流。

Study on no-load closing inrush current of transformer group and suppression measures

Taking no-load closing inrush current theory of a single transformer as a foundation, combined with the transformer of the situation in practice, this paper further studies transformer group inrush current. Based on transformer group no-load closing characteristics, it proposes to increase the system impedance and capacitors. Through contrasting the flux changes between the transformer before/after increasing system impedance, it analyzes its impact on the inrush current and describes a method to select the best impedance values. Finally, no-load closing inrush current of transformer group simutaneously switch-on is simulated by using Matlab, and its value is compared with inrush current value of the shcheme of installing single resistor and the scheme of both installing resistor and capacitor. Simulation results show that this suppression scheme effectively suppresses the transformer group inrush current.