基于动态重燃弧模型的VFTO与VFTC仿真及特性分析

为了准确分析高压开关设备操作过程中的高频、高幅值电磁干扰问题，提出了一种基于动态重燃弧模型的建模方法。利用ATP-EMTP软件建模比较了不同电弧模型下的仿真效果，探讨了燃弧电阻、线路长度、击穿延时、断口电容及燃弧电感等5种因素对仿真结果的影响规律。同时，搭建了隔离开关分合容性小电流实验线路。通过对比仿真和实测数据发现：与传统模型相比，动态重燃弧模型下暂态电压和暂态电流峰值的仿真和实测之间误差分别降低了0.64%和13.94%，且波形特征参数均在实测数据的变化范围内。表明该模型能够更准确地反映开关分合时的暂态过程，对提高开关动作过程中暂态电压和暂态电流的仿真计算精度具有重要意义。

Simulation and characteristic analysis of VFTO and VFTC based on a dynamic reignition arc model

To accurately analyze high-frequency and high-amplitude electromagnetic inference during the operation of high-voltage switchgear, a modeling method based on a dynamic reignition arc model is proposed. The simulation effects under different arc models are compared using ATP-EMTP software, and the influence of five factors, i.e. arc resistance, line length, breakdown delay, fracture capacitance and arc inductance, on the simulation results are discussed. In addition, an experimental circuit for the disconnector to separate and connect the capacitive low current is built. By comparing the simulated and measured data, it is found that in comparison with the traditional model, the errors between the simulated and measured peak values of transient voltage and transient current are reduced by 0.64% and 13.94% respectively under the dynamic reignition arc model. The characteristic parameters of simulation waveforms are all within the variation range of the measured data. This indicates that the proposed model can reflect the transient process more accurately during the on/off operation of the disconnector. This is of great significance for improving the calculation accuracy of the transient voltage and transient current during the switching operation. This work is supported by the National Natural Science Foundation of China (No. U1866201).