基于改进串联合闸电阻的变压器励磁涌流抑制研究

在利用合闸电阻抑制变压器轻载或空载合闸时产生励磁涌流的基础上,提出一种在合闸电阻上串联适当电容器的改进方法。该方法在原有的合闸电阻上串联电容,通过适当选取电容的容值,以减少励磁涌流的大小,加快励磁涌流的衰减速度。将该方法与分相合闸技术相结合,可最大程度实现变压器励磁涌流的抑制。仿真实验结果验证了该方法的可行性。

Research of restraining of transformer excitation inrush current based on improved series closing resistance

Based on using closing resistance to reduce transformer excitation inrush current produced in underloading and no-load,an improved method of in series with capacitor on closing resistance was proposed.The method connects capacitors in series with the original closing resistance,and selects suitable capacitor value,so as to restrain excitation inrush current and accelerate attenuation speed of the excitation inrush current.Combining with split phase closing techniques,the method can restrain the transformer excitation inrush current greatly.The simulation results validate feasibility of the method.