考虑金属护层结构的电缆新型故障测距方法研究
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上海电力大学 电气工程学院

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国家自然科学基金青年项目(51607110)


Research on A New Fault Location Method for Cable Considering Metal Sheath Structure
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Shanghai University of Electric Power

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    摘要:

    单芯电力电缆的很多绝缘故障都和金属护层有关,只研究电缆导芯的简化结构模型不能进行护层相关故障的测距。基于分布参数模型,提出一种考虑电缆金属护层的新型故障测距方法。首先,使用分布参数理论分析计及金属护层的故障电缆等效分布参数电路,建立电压、电流方程;然后,通过边界条件求解电压、电流方程中的未知参数,得到故障点前、后的电压、电流值;最终,通过构建测距方程迭代搜索得到故障距离。该方法将复杂的相网络转化为相互独立的序列网络,使得该算法变得简单有效。大量仿真结果表明,该算法能实现护层相关故障(护层对地故障、芯-护层故障和芯-护层对地故障)的精确测距,测距误差基本不超过1.5%,且定位结果不受故障发生位置、故障类型以及过渡电阻的影响。

    Abstract:

    Many of single-core power cable insulation fault and metal sheath is concerned, only the simplified structure model of cable guide core cannot protect layer related to the fault location. Based on the distributed parameter model, a new fault location method considering the cable metal sheath is proposed. Firstly, Based on the distributed parameter theory, the equivalent distributed parameter circuit of fault cable with metal sheath is analyzed, and the voltage and current equations are established; Then, the unknown parameters in the voltage and current equations are solved by boundary conditions to obtain the voltage and current values along the line; Finally, the fault distance is obtained by constructing the iterative search of the fault distance equation. This method transforms the complex phase network into the independent sequence network, which makes the algorithm simple and effective. A large number of simulation results show that this algorithm can achieve accurate ranging of sheath fault (sheath to ground fault, core-sheath fault and core-sheath to ground fault), the error of ranging is basically less than 1.5%, and the positioning result is not affected by the fault location, fault type and transition resistance.

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  • 收稿日期:2020-09-06
  • 最后修改日期:2020-10-27
  • 录用日期:2020-11-23
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