基于介质击穿原理的配电线路高阻接地故障精确建模

发布时间：2018-07-23 15:13

【摘要】：配电线路负荷率快速增加和电缆线路的广泛应用使得配电网中性点有效接地方式得到越来越多的应用。中性点有效接地配电线路受送电走廊、自然环境等因素影响,容易发生弧光高阻接地故障;此类故障电流幅值小,保护难以检测跳闸,很少能获取到现场录波数据;而人工接地试验成本高,难以频繁使用,因此挖掘有限的试验数据,实现弧光高阻接地模型的精确建模尤为重要。文中在详细分析基于热平衡原理的电弧模型机理的基础上,指出了该类模型不完全适用于开放空间,以及弱故障电流的高阻弧光接地故障。针对以上问题,文中基于固体介质电击穿原理,提出并建立了配电线路高阻接地故障点非线性电阻模型,理论分析及现场试验数据验证了模型的准确性;为后续的高阻接地故障检测算法研究奠定了理论基础。
[Abstract]:With the rapid increase of distribution line load rate and the wide application of cable line, the effective grounding mode of neutral point in distribution network has been applied more and more widely. Due to the influence of power transmission corridor, natural environment and other factors, it is easy to occur arc high resistance grounding fault in neutral power distribution line, such as low current amplitude, difficult to detect tripping, and rarely obtaining field recorded wave data. But the artificial grounding test is expensive and difficult to be used frequently, so it is very important to mine the limited test data and realize the accurate modeling of arc high resistance grounding model. Based on the detailed analysis of the mechanism of arc model based on heat balance principle, it is pointed out that this kind of model is not fully applicable to open space and high resistance arc grounding fault with weak fault current. In view of the above problems, based on the principle of solid dielectric breakdown, a nonlinear resistance model for high resistance grounding fault points of distribution lines is proposed and established. The accuracy of the model is verified by theoretical analysis and field test data. It lays a theoretical foundation for the subsequent research of high resistance grounding fault detection algorithm.
【作者单位】：清华大学电机工程与应用电子技术系;电力系统及发电设备控制和仿真国家重点实验室清华大学;
【基金】：国家自然科学基金资助项目(51007045,51120175001) 电力系统及发电设备控制和仿真国家重点实验室课题资助项目(SKLD13M11) 新能源电力系统国家重点实验室开放课题资助项目(LAPS13004)~~
【分类号】：TM862.3

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