阻性负载下含分段噪声的间歇性直流电弧阻抗模型

构建准确且能够较为全面地反映出电弧特征的阻抗模型，对于电弧故障定位与检测的研究具有重要意义。针对现有的电弧阻抗模型无法反映出间歇性和完整噪声特性的问题，提出了含分段噪声的间歇性电弧阻抗模型。首先，通过对阻性负载条件下间歇性直流电弧的实验数据进行时频域特征分析，其结果表明时域上电弧阻抗随电流变化且随机性较强，频域上电弧噪声在高、低频段呈现的频谱分布存在差异。然后，提出了具有概率分布规律的阻抗模型以反映电弧在时域上的随机性与间歇性，同时采用分段噪声模型来体现其频域上噪声频谱分布的特点。最后，基于实验数据验证了模型的性能，结果表明所提出的模型能够同时在时域和频域上准确刻画出间歇性电弧的随机特性。

Intermittent DC arc impedance model with segmented noise under resistive loads

Research on arc fault location and detection needs to build an accurate and comprehensive impedance model that can reflect the characteristics of the arc. There is a problem in that existing arc impedance models cannot reflect intermittent and complete noise characteristics. Thus, an intermittent arc impedance model with segmented noise is proposed. First, the time-frequency domain characteristics of the experimental data of intermittent DC arc under resistive loads are analyzed, and the results show that the arc impedance varies with the current and is highly random, and the arc noise in the frequency domain presents differences in the spectral distribution of high and low frequency bands. Then, the impedance model with a probability distribution law is proposed to reflect the randomness and intermittency of the arc in the time domain, and the segmented noise model is used to reflect the characteristics of the noise spectrum distribution in the frequency domain. Finally, the performance of the model is verified based on experimental data, and the results show that the proposed model can accurately depict the random characteristics of the intermittent arc in both the time and frequency domains.