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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。
In order to simulate and analyze the influence of varistor on the waveform parameters of the short-circuit current, the tri-line method was used to establish the simulation model of varistor. When no load was applied, the short-circuit current wavefront time and half Peak time, reverse polarity oscillation and virtual resistance were 7.67μs, 21.59μs, 12.48% and 2.07Ω, respectively. The simulation study on the varistor load shows that the wavefront time of the combined short-circuit current wave changes from 7.35μs when the voltage of the storage capacitor changes from 200V to 15kV for the varistor load whose voltage-sense voltage U1mA is 18V. To 7.67μs, the rate of change was 4.35%, the half-peak time changed from 21.16μs to 21.66μs, the rate of change was 2.36%, and the virtual impedance changed from 2.48Ω to 1.999Ω, the rate of change was 19.40%. As for the varistor load with voltage U1mA of 330V, when the charging voltage of the storage capacitor changes from 1000V to 15kV, the wavefront time of the combined shortwave current wave of 8/20μs changes from 5.79μs to 7.5625μs, The half-peak time of the shortwave current wave of 8/20 μs of the composite wave changes from 18.1 μs to 21.43 μs with a rate of change of 18.4%. The virtual impedance changes from 6.434Ω to 2.16Ω with a rate of change of 66.4%. The results provide a theoretical basis for the study of varistor characteristics and the design of combinational circuit.