输电线路耐张线夹模锻压接质量分析及实验研究

Analysis and Experimental Study on Die Forging Crimping Quality of Strain Clamp for Transmission Line

采用有限元分析方法构建了架空输电线路钢芯铝绞线和耐张线夹的模锻压接分析模型及压接后服役状态仿真分析模型,对其模锻压接全过程及压接后试样不同工况下服役拉伸过程进行了仿真分析,并采用导线模锻压接实验和拉伸实验对仿真模型进行了验证。基于仿真模型分析了有效压接宽度、压接力等关键压接参数对模锻压接力学性能的影响,获得不同参数下钢芯铝绞线与耐张线夹的破坏模式、最大握紧力及对应的临界压接力。结果表明:模锻压接力较小时,耐张线夹的失效形式为铝绞线从耐张线夹中滑脱,极限握紧力随压接力的增加而增大;随着压接力增大耐张线夹的失效形式逐渐演变为耐张线夹铝管断裂。

The models of die forging crimping and the simulation analysis model in service state after crimping for the connection between the steel reinforced aluminum conductor(SRAC) and strain clamp in overhead transmission line were constructed by using the finite element analysis method. The whole process of die forging crimping and the tensile process of the samples under different working conditions after pressing were simulated and analyzed. The simulation models were verified by wire die forging crimping and tensile experiments. Based on the simulation model, the influence of the effective crimping width and the crimping force on the mechanical properties of die forging crimping was analyzed. The failure modes,maximum grip force and corresponding critical compressive force of SRAC and strain clamp under different parameters were obtained. The results show that when the die forging crimping force is small, the failure mode of the strain clamp is that the aluminum strand slips from the strain clamp, and the ultimate grip strength increases with the increase of the crimping force.With the increase of the crimping force, the failure mode of the strain clamp gradually evolves into the aluminum tube fracture of the strain clamp.