Simulation Analysis of Mechanical Properties of DC Transmission Lines Under Mountain Fire Condition

IF 0.7 4区材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING

Strength of Materials Pub Date : 2024-09-19 DOI:10.1007/s11223-024-00680-2

G. Q. Li, Z. B. Han, H. Zhu, W. Cui, H. D. Zhao, Y. Zheng, L. T. Fan

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Abstract

In the development and construction of the power grid, the transmission line corridor inevitably passes through the area with dense vegetation. Forest fires are common in the dry season, seriously affecting the normal operation of the transmission line. Due to the sharp increase in air temperature and a large amount of smoke during combustion, the steel-core aluminum strand without a sheath is directly exposed to the air of the fire field. Due to the high temperature and adhesion, the structure of the wire changes and the tensile strength decreases accordingly, which can lead to serious damage to the wire, including broken strands and fractures, and it can no longer be used. To solve the problem that it is difficult to assess the operational characteristics of transmission lines after a fire, the mechanical characteristics of transmission lines under forest fire conditions are studied through theory and simulation so that the mechanical characteristics of transmission lines after a forest fire can be quantitatively expressed. It is proposed that a mechanical design manual for conductors under mountain fire conditions be created and the online monitoring system for transmission conductors under mountain fire conditions be improved.

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山火条件下直流输电线路机械特性的仿真分析

在电网开发建设过程中，输电线路走廊不可避免地要经过植被茂密的区域。旱季森林火灾频发，严重影响输电线路的正常运行。由于空气温度急剧升高，燃烧时产生大量烟雾，没有护套的钢芯铝绞线直接暴露在火场的空气中。由于高温和附着力的作用，导线的结构发生变化，抗拉强度相应降低，会导致导线断股、断裂等严重损坏，无法继续使用。为了解决火灾后输电线路运行特性难以评估的问题，通过理论和仿真研究森林火灾条件下输电线路的力学特性，从而定量表达森林火灾后输电线路的力学特性。建议编制山火条件下导线机械设计手册，完善山火条件下输电导线在线监测系统。

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来源期刊

Strength of Materials MATERIALS SCIENCE, CHARACTERIZATION & TESTING-

CiteScore

1.20

自引率

14.30%

发文量

审稿时长

6-12 weeks

期刊介绍： Strength of Materials focuses on the strength of materials and structural components subjected to different types of force and thermal loadings, the limiting strength criteria of structures, and the theory of strength of structures. Consideration is given to actual operating conditions, problems of crack resistance and theories of failure, the theory of oscillations of real mechanical systems, and calculations of the stress-strain state of structural components.