变压器空载合闸励磁涌流的仿真分析研究

Simulation Research on Magnetizing Inrush Current when Transformer is Energized Under No-load Condition

变压器在轻载或者空载的情况下合闸通电的时候,可能变压器的一次侧绕组中流过励磁涌流。励磁涌流出现的原因是在变压器铁芯被拖入饱和区甚至是深度饱和区,励磁涌流对变压器自身和对电网中的电能质量都有不利影响。基于Matlab对单相变压器和三相变压器的合闸涌流进行了仿真研究,同时对变压器空载合闸涌流的特性进行了深入的分析,对变压器差动保护的精确整定,以及对变压器空载合闸励磁涌流的抑制方法提供了突破口。

When transformers are energized under no-load or lightly loaded condition, in rush currents may flow in the primary circuit. The magnetizing in rush currents are generated when transformer cores are driven into saturation or even deep saturation zone, and magnetizing in rush currents have adverse effect both on the transformer itself and the power quality in the power system. It simulated the magnetizing in rush current both in the single phase transformer and the three phase transformer based on Matlab/Simulink,and at the same time it make deep analysis of the characteristic of the magnetizing in rush current, which is very helpful in the setting of the transformer relay. It also shows a bright future path to mitigate the magnetizing in rush current in future.