10kV绝缘架空线路雷击断线仿真分析
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1.长沙理工大学;2.国网湖南省电力科学研究院;3.国网湖南检修公司

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国家自然科学基金(51777015)


Simulation Analysis of Lightning Stroke Breaking of 10kV Insulated Overhead Transmission Line
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1.Changsha University of Science and Technology;2.Electric Power Research Institute of State Grid Hunan Electric Power Company;3.Maintenance Company of Hunan Electrical Power Corporation

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    摘要:

    为研究10kV架空绝缘线路雷击断线机理,基于COMSOL建立了绝缘导线烧蚀模型,对导线受到雷电流和工频短路电流时的烧蚀状况进行仿真。然后建立导线受力模型,分析导线被烧蚀时的受力情况。根据仿真结果,雷电流仅在导线绝缘层留下一击穿孔;若不考虑外力影响,工频电弧能在1.3s内将绝缘导线烧蚀熔断。绝缘导线的力学仿真结果显示,导线在烧蚀处的张力发生突变,并且受到线间电动力及电弧电磁推力的作用。结合理论分析得出雷击断线的主要原因是导线在热学及力学共同作用下发生塑性形变及脆性断裂,造成断线,断口介于塑性断裂和脆性断裂之间。该仿真研究为10kV架空绝缘导线的防雷提供了参考。

    Abstract:

    In order to study the breaking mechanism of 10kV overhead insulated lines by lightning, an ablation model of insulated conductors was established based on COMSOL, and the ablation status of the conductors when subjected to lightning current and power frequency short-circuit current was simulated. Then the force model of the wire is established to analyze the force when the wire is ablated. According to the simulation results, the lightning current only leaves a perforation in the wire insulation; if the influence of external forces is not considered, the power frequency arc can ablate and fuse the insulated wire in 1.3s. The mechanical simulation results of the insulated wire show that the tension of the wire at the ablation site undergoes abrupt changes and is affected by the electromotive force between the wires and the electromagnetic thrust of the arc. Combined with theoretical analysis, it is concluded that the main reason for the wire breakage caused by lightning is the plastic deformation and brittle fracture of the wire under the combined action of heat and mechanics. The simulation research provides a reference for lightning protection of 10kV overhead insulated wires.

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  • 收稿日期:2021-05-08
  • 最后修改日期:2021-05-26
  • 录用日期:2021-06-25
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