基于改进配电变压器截波过电压暂态模型的仿真  

Simulation Based on Modified Chopped Overvoltage Transient Model of Distribution Transformer

作　　者：朱立波 杨柳萍 

机构地区：[1]南宁供电局,广西南宁530000

出　　处：《广西电力》2010年第3期9-11,20,共4页Guangxi Electric Power

摘　　要：为了加强配电变压器运行的安全性,避免避雷器动作后造成的截波过电压对配电变压器造成损害,建立了描述配电变压器绕组暂态过程的时域等值电路,并根据所给的技术参数,计算出了配电变压器时域等值电路中参数值。建立了基于MATLAB语言下的改进配电变压器截波过电压暂态仿真模块,对加入防雷电抗器前后配电变压器绕组的暂态过程进行了仿真,绘制出了一次、二次绕组的电流、电压波形。仿真结果表明,配电变压器加入防雷电抗器后,变压器绕组上的电压、电流幅值和陡度均有明显下降,验证了新型防雷电抗器的理论可行性,能够有效降低配电变压器截波过电压[1-3]。In order to enhance the security of distribution transformer operation and avoid the damage of chopped overvoltage caused by arrester＇s action,a time domain equivalent circuit is built to describe the transient process of distribution transformer winding,whose parameters are calculated based on the given technique parameters.A modified chopped overvoltage transient simulation module of distribution transformer is built based on MATLAB,which can simulate the transient process of distribution transformer winding with and without the lightningproof reactor and can draw the current and voltage waves of primary and secondary windings.The simulation results show that the currant and voltage＇s magnitude and gradient of distribution transformer winding descend obviously and thus prove the theoretical feasibility of newtype lightningproof reactor which can descend the chopped overvoltage of distribution transformer effectively.

关 键 词：配电变压器 截波过电压 数学模型 暂态模型 仿真分析配电线路 

分 类 号：TM743[电气工程—电力系统及自动化]