中性点经消弧线圈接地系统小电流接地故障暂态等值电路及暂态分析

发布时间：2018-01-20 12:35

本文关键词： 中性点经消弧线圈接地系统小电流接地故障暂态等值电路模型简化暂态分析　出处：《中国电机工程学报》2015年22期 　论文类型：期刊论文

【摘要】：对于经消弧线圈接地系统的小电流接地故障,传统暂态等值电路存在忽略线模信息、消弧线圈位置不准确、缺乏具体参数计算方法等缺陷,无法用于故障暂态的定量分析和计算。建立包含故障点上下游网络的小电流接地故障分布参数模型,利用模型简化原则建立由等效电阻、等效电感、系统对地分布电容及消弧线圈等效电感构成的Γ型精确暂态等值电路。基于简化原则推导出表达形式简单、满足工程应用需求的简化参数计算方法。与传统暂态等值电路相比,所建等值电路包含线模和零模信息,等效电感近似等于故障点到母线间线路的零模电感与2倍线模电感之和,且消弧线圈接于母线处更符合实际情况。针对低阻接地、高阻接地,分别给出暂态电流的解析表达式,分析暂态主谐振频率、幅值、衰减因子等要素随故障条件的变化规律,分析结果有助于更全面把握故障暂态特征。最后利用仿真及现场故障数据验证了所建暂态等值电路模拟精度更高、适用性更强、暂态分析结果正确。
[Abstract]:For the small current grounding fault of the grounding system through the arc-suppression coil, the traditional transient equivalent circuit has some defects such as ignoring the line-mode information, the position of the arc-suppression coil is inaccurate, and the calculation method of specific parameters is lacking. It can not be used in the quantitative analysis and calculation of fault transient. The distributed parameter model of small current grounding fault including the upstream and downstream network of fault points is established, and the equivalent resistance and equivalent inductance are established by using the simplified principle of the model. A 螕 type accurate transient equivalent circuit composed of distributed capacitance to ground and equivalent inductance of arc-suppression coil is derived based on the simplified principle. Compared with the traditional transient equivalent circuit, the circuit consists of linear mode and zero mode information. The equivalent inductance is approximately equal to the sum of zero mode inductance and double wire mode inductance between fault points and bus lines, and the arc-suppression coil connected to the bus line is more in line with the actual situation. The analytical expressions of transient current are given, and the variation rules of transient main resonance frequency, amplitude and attenuation factor with fault condition are analyzed. The analysis results are helpful to grasp the fault transient characteristics more comprehensively. Finally, the simulation and field fault data are used to verify that the simulation accuracy is higher, the applicability is stronger, and the transient analysis results are correct.
【作者单位】：中国石油大学(华东)信息与控制工程学院电气系;电网智能化调度与控制教育部重点实验室(山东大学);山东理工大学智能电网研究中心;
【基金】：国家自然科学基金项目(51477184;51077090) 国家863高技术基金项目(2012AA050213)~~
【分类号】：TM862;TM475
【正文快照】： main resonance frequency,amplitude,attenuation factors wereanalyzed,which was benefit for the analysis of transientcharacteristics.Simulations and field data verify the accuracyof transient analysis.The transient equivalent circuitsestablished in this pa

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