基于波反射理论的新型防雷变压器的仿真分析

配电变压器是极易受雷击损坏的电气设备,一旦遭受雷击损坏将影响电力系统的稳定运行,并给用户造成直接或间接的经济损失。为了加强变压器的防雷性能,文章介绍了一种新型防雷变压器的设计方案以及防雷作用的机理。然后基于变压器绕组的时域等值电路,采用MATLAB软件中Simulink的状态方程模块的仿真模型法,仿真出标准雷电压波作用于它时的暂态过程。仿真证明基于波反射理论的新型防雷变压器新增附加绕组对正、反变换过电压都有较理想的抑制作用,这种新型防雷变压器的设计方案是切实可行的。

Simulation and Analysis about a New Type of Lightning Proof Transformer Based On the Theory of Wave Reflection

Transformer is an electrical equipment which is vulnerable under lightning attack.Power system would lose its stability once a transformer suffers from the lightning attack,and thus economic lost would be turned out to the subscribers.This paper introduces the design and principle of a New Type Lightning-proof Transformer(NTLT) to enhance the lightning protection performance of the transformer.Transient process of standard lightning waveform is simulated by the method of simulation model in MATLAB based on the time domain equivalent circuit of the transformer.The results of simulation prove that the attached windings of NTLT based on wave reflection have satisfactory effects on restraining the positive and reverse transformation of overvoltage and this NTLT is efficient and effective.