Calculation method and experimental research on strand breakage in large cross-section conductors considering contact between strands

IF 4.4 2区工程技术 Q1 ENGINEERING, MECHANICAL

Engineering Failure Analysis Pub Date : 2024-11-01 DOI:10.1016/j.engfailanal.2024.109020

Qin Jian , Qiao Liang , Qi Zhiqiang , Liu Chen , Zhang Feikai

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引用次数: 0

Abstract

This paper proposes a numerical method for the strand breakage defect in large cross-section conductors during tension stringing construction. First, the contact types between strands in the same layer and adjacent layers of the conductor were analyzed. The relationship between the force and depth of strand contact was then determined. The structural calculation method for straight conductor under tensile and torsional loads was proposed considering in the contact between strands, which can obtain the accurate calculation results of strands in different layers. The method avoids the establishment of complex multi-strand models and the setup of large number contact pairs, and has a much higher computational efficiency than finite element method (FEM), the performance gap is up to 300 times. For 630 mm² conductor, the calculated results of strands demonstrated significant changes in the axial forces of strands of different layers under positive and negative torque, which substantially influences the strand breakage patterns. Through the analysis of the mechanical cause of strand breakage, a calculation formula for the axial force of strands were proposed based on the deformation process as the conductor passes through the stringing block. The results of 630 mm² conductor indicated that the torque and tension on the conductor are critical factors of the strand breakage. Referencing the actual engineering conditions, a test setup was designed to simulate the conductor passing through the block, and the breakage defect of strand was reproduced. The forms and locations of the breakage defects observed in the tests were consistent with the calculated results, validating the alignment of the theoretical analysis with actual states. This proposed method can be applied to analyze the strand defect of conductor with various cross-sections, which offers a theoretical foundation for the prevention and control of construction defect in the transmission line.

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考虑股间接触的大截面导线断股计算方法与实验研究

本文提出了一种针对大截面导线在张力成串施工过程中的断股缺陷的数值方法。首先，分析了导体同层和相邻层钢绞线之间的接触类型。然后确定了力与钢绞线接触深度之间的关系。考虑到钢绞线之间的接触，提出了直导体在拉伸和扭转载荷作用下的结构计算方法，可获得不同层钢绞线的精确计算结果。该方法避免了复杂的多股模型建立和大量接触对的设置，计算效率远高于有限元法（FEM），性能差距高达 300 倍。对于 630 平方毫米的导体，钢绞线的计算结果表明，在正扭矩和负扭矩作用下，不同层钢绞线的轴向力发生了显著变化，这对钢绞线的断裂模式产生了重大影响。通过分析钢绞线断裂的机械原因，根据导体通过穿线块时的变形过程，提出了钢绞线轴向力的计算公式。630 平方毫米导体的研究结果表明，导体上的扭矩和张力是造成钢绞线断裂的关键因素。参照实际工程条件，设计了一套试验装置来模拟导体通过穿线块，并再现了钢绞线的断裂缺陷。试验中观察到的断裂缺陷的形式和位置与计算结果一致，验证了理论分析与实际状态的一致性。该方法可用于分析不同截面导线的断股缺陷，为输电线路施工缺陷的防治提供了理论依据。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Engineering Failure Analysis 工程技术-材料科学：表征与测试

CiteScore

7.70

自引率

20.00%

发文量

956

审稿时长

47 days

期刊介绍： Engineering Failure Analysis publishes research papers describing the analysis of engineering failures and related studies. Papers relating to the structure, properties and behaviour of engineering materials are encouraged, particularly those which also involve the detailed application of materials parameters to problems in engineering structures, components and design. In addition to the area of materials engineering, the interacting fields of mechanical, manufacturing, aeronautical, civil, chemical, corrosion and design engineering are considered relevant. Activity should be directed at analysing engineering failures and carrying out research to help reduce the incidences of failures and to extend the operating horizons of engineering materials. Emphasis is placed on the mechanical properties of materials and their behaviour when influenced by structure, process and environment. Metallic, polymeric, ceramic and natural materials are all included and the application of these materials to real engineering situations should be emphasised. The use of a case-study based approach is also encouraged. Engineering Failure Analysis provides essential reference material and critical feedback into the design process thereby contributing to the prevention of engineering failures in the future. All submissions will be subject to peer review from leading experts in the field.