大截面钢芯铝绞线导线压接拉断仿真分析

Simulation analysis of compression and tensile fracture of large section wire with steel core and aluminum strand

大截面导线输变电作为一项自主开发特高压输电技术被得到广泛应用,但是输电线路导线压接完成后,压接管内部缺陷不易发现,并且内部铝绞线表面划伤、断股等内部缺陷严重降低了输电线路载流量和机械强度。为解决存在的问题,提出一种大截面导线钢芯铝绞线压接拉断仿真方法。以JL/G1A-400/35导线为例,对压接后铝绞线损伤情况进行了建模、计算,重点分析了铝绞线在断股、表面受损以及在铝绞线未损情况下拉断时所受应力情况。仿真结果表明,当铝绞线存在断股现象时,拉断铝绞线的最大应力达到802.6 MPa;当铝绞线存在受损现象时,拉断铝绞线的最大应力达到829.3 MPa;当铝绞线未损时,拉断铝绞线最大拉断应力865.2 MPa,为3种情况的最大值。在铝绞线采取先压接后拉断的仿真计算中,在加载1 010 MPa压强时,铝绞线压接后所能承受的拉断力最大。以上仿真分析结果可为大截面导线钢芯铝绞线压接工艺优化提供参考。

As a self-developed UHV power transmission technology, large cross-section wire transmission and transformation is widely used, but after the completion of the crimping of the transmission line wire, the internal defects of the crimping tube are not easy to find, and the internal aluminum strand surface is scratched, stranded and other internal defects seriously reduce the current carrying capacity and mechanical strength of the transmission line. In order to solve the existing problems, a simulation method for crimping and breaking of large cross-section conductor steel core aluminum stranded wire is proposed. Taking the JL/G1 A-400/35 wire as an example, the damage of the aluminum stranded wire after crimping is modeled and calculated, and the strands are broken, the surface is damaged, and the aluminum stranded wire is not damaged. Stress condition at the time of breaking. The simulation results show that when the aluminum stranded wire is broken, the maximum stress of the broken aluminum strand reaches 802.6 MPa, when the aluminum strand is damaged, the maximum stress of the broken aluminum strand reaches 829.3 MPa, When the stranded wire is not damaged, the maximum breaking stress of the aluminum stranded wire is 865.2 MPa, which is the maximum value of the three cases. In the simulation calculation where the aluminum stranded wire is crimped first and then broken, when a pressure of 1 010 MPa is loaded, the aluminum stranded wire can withstand the largest breaking force after crimping. The above simulation analysis results can provide a reference for the optimization of the crimping process of large cross-section conductor steel core aluminum stranded wire.