ZnO压敏电阻组合波回路输出的仿真  

Simulation of Combination Waveform Generator for ZnO Varistors

作　　者：陈景亮[1] 姚学玲[1] 孙伟[2] 

机构地区：[1]西安交通大学电气工程学院,西安710049 [2]西安建筑科技大学,西安710055

出　　处：《高电压技术》2009年第10期2390-2394,共5页High Voltage Engineering

基　　金：陕西省重大科技创新项目(2008ZKC02-10)~~

摘　　要：为了仿真分析压敏电阻对组合波短路电流波形参数的影响规律,采用了三折线法了建立了压敏电阻的仿真物理模型,在组合波未加任何负载时,短路电流的波前时间、半峰值时间、反极性震荡以及虚拟电阻分别为7.67μs、21.59μs、12.48%和2.07Ω。加入压敏电阻负载的仿真研究得出:对于压敏电压U1mA为18V的压敏电阻负载,当储能电容上电压从200V变化到15kV时,组合波短路电流波的波前时间由7.35μs变化到7.67μs,变化率为4.35%,半峰值时间由21.16μs变化到21.66μs,变化率为2.36%;虚拟阻抗由2.48Ω变化到1.999Ω,变化率为19.40%。而对于压敏电压U1mA为330V的压敏电阻负载,当储能电容上的充电电压从1000V变化到15kV时,组合波8/20μs短路电流波的波前时间由5.79μs变化到7.5625μs,变化率为30.6%,组合波8/20μs短路电流波的半峰值时间由18.1μs变化到21.43μs,变化率为18.4%,虚拟阻抗由6.434Ω变化到2.16Ω,变化率达66.4%。研究结果对压敏电阻的特性研究和组合波电路的设计提供了理论依据。A simulation model of varistor was set up for studying the influence of varistor on short current waveform parameters of CWG（combination wave generator）,and the simulation results were received.In the absence of load,the rise time and half peak time of CWG are 7.67 μs and 21.59 μs,respectively,the anti-polarity current shock is 12.48%,and the virtual impedance of CWG is 2.07 Ω.When the capacitor voltage changes from 200 V to 15 kV,Φ23-180 K varistor makes the rise time of short current of CWG to change from7.35 μs to 7.67 μs, the half peak time from 21.16 μs to 21. 66 μs, and virtual impedance from 2.48 12 to 1. 999 12. When varistor is Ф23-331 K, the parameters of short current change greatly, the rise time of short current of CWG changes from 5.79 μs to 7. 5625 μs, the half peak time from 18.1 μs to 21.43 μs, and virtual impedance from 6. 434 12 to 2.16 12. The results will provide a theoretical foundation for further study of varistor characteristic and the design of CWG circuit.

关 键 词：压敏电阻 非线性特性 仿真模型 动态电阻 组合波 波形参数 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置]