互感线路接地距离Ⅰ段超越影响分析及其整定策略

发布时间：2019-06-04 17:59

【摘要】：为防止互感线路接地距离Ⅰ段超越,分析电网运行方式对接地距离Ⅰ段的影响,确定定值边界十分必要。文章在互感线路测量阻抗分析完整模型的基础上进行分析,提出了接地距离Ⅰ段可能超越的3种极值工况模型。针对各极值工况对模型中各因素影响互感线路接地距离Ⅰ段测量阻抗的机理进行定性分析,确定求取测量阻抗极值的简化模型并解析定量求解极值,得出在极端情况下,接地距离Ⅰ段测量阻抗理论上可趋于0。利用整定软件进行算例仿真,验证了理论推导的正确性。根据极值工况模型,结合电网中实际典型工况提出了互感线路接地距离Ⅰ段在不同工况下的取值策略,以及统一整定为0.4倍线路正序阻抗的简化整定策略,从而提高了接地距离Ⅰ段定值的适应性。
[Abstract]:In order to prevent the grounding distance of mutual inductance lines from surpassing, it is necessary to analyze the influence of power grid operation mode on the ground distance I, and to determine the fixed value boundary. In this paper, based on the complete model of impedance analysis of mutual inductance line measurement, three kinds of extreme working condition models which may exceed the grounding distance section I are put forward. According to the qualitative analysis of the mechanism of each extreme condition affecting the impedance measurement in the first section of the grounding distance of the mutual inductance line, the simplified model for calculating the extreme value of the measured impedance is determined and the extreme value is solved analytically and quantitatively, and the results are obtained in extreme cases. In theory, the measured impedance of the first stage of grounding distance can tend to 0. The correctness of the theoretical derivation is verified by using the setting software to simulate the example. According to the extreme value working condition model, combined with the actual typical working conditions in the power grid, this paper puts forward the value strategy of the grounding distance I section of the mutual inductance line under different working conditions, and the simplified setting strategy of unified setting to 0.4 times the positive sequence impedance of the line. Thus, the adaptability of the fixed value of the grounding distance I is improved.
【作者单位】：中国南方电网电力调度控制中心;
【分类号】：TM773

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