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首页> 外文期刊>Electric power systems research >Transient circuit implementation of arc models with particular focus on arcs in low-voltage power cables
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Transient circuit implementation of arc models with particular focus on arcs in low-voltage power cables

机译：电弧模型的瞬态电路实现，特别关注低压电力电缆中的电弧

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摘要

Accurate and detailed fault arc models are increasingly important for development of modern power system protection algorithms which demand very granular and realistic time domain simulation. While the literature spans several decades, few contributions specifically address arcing in low voltage (LV) power cables. Such cables are usually installed underground, underwater, or even in space, making them difficult to access in the field. Real world fault studies on LV power systems are difficult and disruptive so existing fault data is scarce. Therefore to generate reliable and extensive data on the influence of fault arcing on power networks, electromagnetic transient (EMT) timescale simulations of the grid are required at circuit level, together with a commensurate circuit model of the arc itself. This paper therefore assesses existing arc models for their suitability for implementation in a circuit simulator and, for the first time, presents universal electrical circuits that solve existing arc model equations. Although the existing models have mostly been developed for arcs in high voltage overhead lines and circuit breakers, circuit simulations are presented here to evaluate their suitability for LV power cables. Particular emphasis is therefore given to the model inspired by the ablation process as the arc propagates through the cable dielectric. Following the circuital implementation of existing models, a novel Low Impedance Arc Model (LIAM) is presented that computes the time varying "ablation" conductance with a reduced number of parameters. Quantitative analysis of the arc conductance as a function of time (for the models considered in this study) was performed to show the important influence of the electrical environment to the development and the shape of the arc. It was found that the resistance of the source driving the arc is of crucial importance. Furthermore, in order to create a more realistic simulation tool, a model of the high frequency component of the arc conductance is demonstrated for the first time. (C) 2017 Elsevier B.V. All rights reserved.
机译：精确而详细的故障电弧模型对于现代电力系统保护算法的开发变得越来越重要，而现代电力系统保护算法需要非常细致而逼真的时域仿真。尽管文献涵盖了数十年，但很少有专门针对低压（LV）电力电缆中的电弧的贡献。这种电缆通常安装在地下，水下，甚至在太空中，这使得它们很难在现场使用。低压电力系统的实际故障研究非常困难且具有破坏性，因此现有故障数据很少。因此，为了生成有关故障电弧对电力网络的影响的可靠且广泛的数据，需要在电路级别对电网进行电磁瞬变（EMT）时标仿真，并提供相应的电弧本身电路模型。因此，本文评估了现有电弧模型在电路模拟器中的适用性，并首次提出了通用电路来解决现有电弧模型方程式。尽管现有模型主要是针对高压架空线路和断路器中的电弧而开发的，但此处还是通过电路仿真来评估其对低压电力电缆的适用性。因此，当电弧传播通过电缆电介质时，将特别强调受消融过程启发的模型。继现有模型的电路实现之后，提出了一种新颖的低阻抗电弧模型（LIAM），该模型可通过减少参数数量来计算随时间变化的“消融”电导。进行了电导率随时间变化的定量分析（对于本研究中考虑的模型），以显示电气环境对电弧的发展和形状的重要影响。已经发现，驱动电弧的源的电阻至关重要。此外，为了创建更逼真的仿真工具，首次演示了电弧电导的高频分量模型。 （C）2017 Elsevier B.V.保留所有权利。

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