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研究目的:铁路电力贯通线供电可靠性要求很高,出现几率较高的单相接地故障会造成供电中断,给行车安全带来隐患,该故障的准确诊断与快速切除方法是铁路维护部门亟待解决的一大技术难题。阻抗法和行波法故障定位的精度达不到故障快速切除的要求,本文依据贯通线分段式结构的特点和对故障处理的快速性要求,通过研究提出区间定位方法。研究结论:通过研究,运用区间分析法推导了集中参数区间算法、故障网络分解区间算法以及分布参数区间算法。结合实际线路模型进行了PSCAD仿真分析,验证了区间定位方法的可行性。为了进一步检验区间定位方法的工程实用性,依据3种算法在凯里至福泉段的贯通线上进行了现场模拟试验,试验结果完全满足工程应用的准确、快速性要求。理论计算和实际试验结果均表明提出的区间算法可以有效解决贯通线故障定位问题。
Research purposes: The reliability of power supply through the line is very high, the single-phase ground fault with high probability will cause the power supply interruption, which will bring hidden dangers to driving safety. The accurate diagnosis and rapid removal of the fault are urgently needed by the railway maintenance department A major technical problem. Impedance method and traveling wave method fault location accuracy can not reach the requirement of rapid fault removal. According to the characteristics of through-line segmented structure and the rapidity of fault handling, this paper proposes interval location method through research. Research conclusions: Through the research, the method of interval parameter analysis, the algorithm of fault network decomposition interval and the algorithm of distributed parameter interval are derived by the method of interval analysis. Combined with the actual line model, the simulation of PSCAD is carried out to verify the feasibility of the method of interval location. In order to further test the engineering practicability of the interval location method, a field simulation test was conducted on the through line of Kaili-Fuquan section according to the three algorithms. The test results fully meet the requirements of engineering application accuracy and speediness. Theoretical calculation and experimental results show that the proposed interval algorithm can effectively solve the problem of through-line fault location.