Simulation analysis of intermittent arc grounding fault applying with improved cybernetic arc model
Simulation analysis of intermittent arc grounding fault applying with improved cybernetic arc model
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DOI：
10.1049/joe.2018.8457
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发表时间：
2018-12
影响因子：
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通讯作者：
Shurong Li;Yongduan Xue;G. Feng;Bingyin Xu
中科院分区：
文献类型：
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作者：
Shurong Li;Yongduan Xue;G. Feng;Bingyin Xu
间歇性电弧接地故障在非固态接地网络中经常发生。建立准确的电弧模型是分析故障特征的基础。首先，本文提出了一种改进的控制论电弧模型，通过控制电弧长度来有效地演示电弧的燃弧过程，并将其应用于间歇性电弧接地故障的仿真分析。然后，提出了一种新的方法来识别何时熄灭或重燃电弧。电弧熄灭取决于稳定点火电压和空气耐受电压的比较，而电弧重燃取决于恢复电压和空气耐受电压之间的竞争。最后，利用PSCAD建立了典型的10 kV配电网仿真模型，分析了电弧模型参数对故障特征的影响。仿真结果与实测数据的对比表明，该电弧模型能够准确描述电弧特性，所提方法产生的间歇性电弧接地过电压与实际情况相符。与中性点不接地系统相比，消弧线圈接地系统的电弧重燃次数少，间歇电弧持续时间短，过电压幅值小。
Intermittent arc grounding fault frequently occurs in non‐solidly earthed networks. Establishing an accurate arc model is the basis for analysis of fault characteristics. First of all, an improved cybernetic arc model is introduced in this study, which can effectively demonstrate arcing process through controlling the arc length, and which is applied to simulation analysis of intermittent arc grounding fault. Then, a novel method is proposed to identify when the arc would extinguish or restrike. Arc extinction is determined by comparing the stable ignition voltage and air withstand voltage, while arc reignition is dependent on the competition between recovery voltage and air withstand voltage. Finally, a typical simulation model of 10 kV distribution network is built via PSCAD, and impacts of arc model parameters on fault characteristics are analysed. Comparison between simulation results and field data indicates that the arc model can accurately describe arc characteristics and that the intermittent arc grounding overvoltage generated by the suggested method is consistent with the actual case. In the Petersen coil grounded system, arc reignition times turns to be fewer, intermittent arc duration shorter and the overvoltage amplitude lower than those in the isolated neutral system.