| 引用本文: | 吴祺嵘,徐婧涵,张国钢,等.基于真型试验和磁流体仿真的电缆单相接地故障电弧场路耦合模型研究[J].电力系统保护与控制,2026,54(04):25-37.[点击复制] |
| WU Qirong,XU Jinghan,ZHANG Guogang,et al.Arc field-circuit coupling modelling of cable single-phase-to-ground faults based on full-scale tests and magnetohydrodynamic simulations[J].Power System Protection and Control,2026,54(04):25-37[点击复制] |
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| 摘要: |
| 配电网电缆单相接地故障具有高发高隐蔽性，其故障暂态过程的研究常采用电弧模型，但现有的电弧模型研究局限于电路特性描述，难以准确反映电缆单相接地故障的暂态特征。因此基于真型试验和磁流体(magnetohydrodynamics, MHD)仿真系统研究了电弧物理演变过程，建立了配电电缆单相接地故障电弧场路耦合模型。首先，基于真型试验进行电缆单相接地故障电弧MHD仿真，建立电弧物理场模型。随后，通过物理场仿真获得电弧耗散功率、时间常数与电导等电弧路模型关键参数，将电弧耗散功率与时间常数重构为关于电导和故障电流等级的函数，结合电路模型以实现电弧场路耦合关系的构建。最后，对比分析了各电弧模型的仿真结果与真型试验波形暂态特征的相对误差，并讨论了不同故障电流等级下电弧场路耦合模型的适用性与暂态特征的变化。结果表明，模型的仿真波形与真型试验的暂态特征相对误差均小于5%，验证了模型的准确性。 |
| 关键词: 电缆单相接地故障 真型试验 磁流体仿真 电弧场路耦合模型 暂态特征 |
| DOI：10.19783/j.cnki.pspc.250560 |
| 投稿时间：2025-05-25修订日期：2025-08-21 |
| 基金项目:国家重点研发计划项目资助(2023YFB2408202)；国家电网总部科技项目资助(5400-202322560A-3-2-ZN) |
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| Arc field-circuit coupling modelling of cable single-phase-to-ground faults based on full-scale tests and magnetohydrodynamic simulations |
| WU Qirong1,XU Jinghan1,ZHANG Guogang1,WANG Haoqing2,ZHANG Xueyang1 |
| (1. State Key Laboratory of Electrical Insulation and Power Equipment (Xi’an Jiaotong University), Xi’an 710049, China;
2. China Electric Power Research Institute, Beijing 100192, China) |
| Abstract: |
| Single-phase-to-ground faults in distribution network cables occur frequently and are difficult to detect. Researches on the transient process of these faults commonly rely on arc models. However, existing arc models primarily focus on circuit characteristics and cannot accurately reflect the transient behavior of cable single-phase-to-ground faults. Based on full-scale tests and magnetohydrodynamics (MHD) simulations, this paper investigates the physical evolution of arcs and establishes a field-circuit coupled arc model for single-phase-to-ground faults. First, based on full-scale experiments, MHD simulations of arcs under cable single-phase-to-ground fault conditions are conducted to develop an arc physical field model. Subsequently, key parameters of the arc circuit model—such as arc dissipation power, time constant, and conductance—are obtained from the physical field simulations. The arc dissipation power and time constant are then reconstructed as functions of arc conductance and fault current level, and combined with the circuit model to establish the arc field-circuit coupling relationship. Finally, the relative errors between the simulation results of various arc models and the transient characteristics obtained from full-scale tests are compared and analyzed. Meanwhile, the applicability of the proposed arc field-circuit coupled model and the variations in transient characteristics under different fault current levels are discussed. The results show that the relative errors between the simulation waveforms and the full-scale experimental transient characteristics are all less than 5%, verifying the accuracy of the proposed model. |
| Key words: cable single-phase-to-ground fault full-scale test magnetohydrodynamic simulation arc field-circuit coupling model transient characteristics |
