考虑风载作用的绝缘穿刺线夹多物理场耦合研究

绝缘穿刺线夹是电力线路架设中最常用的设备之一,随着电力行业的快速发展,对线夹的可靠性、耐热性提出了更高的要求。文章针对绝缘穿刺线夹在实际工作中由于载流量大、电压高、散热条件差等造成的失效问题,开展线夹接触电阻的测量实验,并建立线夹电热力多场耦合有限元模型,考虑风载作用施加合理的热边界条件和循环振动载荷,分析不同安装扭矩对线夹温度及应力分布的影响。研究结果表明,线夹安装扭矩越大,接触电阻、温升及最大应力波动幅度越小,尤其是安装扭矩在24~28 N·m时,线夹最大应力波动幅度骤降,缓解了线夹的疲劳寿命。该文研究成果为绝缘穿刺线夹在实际应用中施加合适的预紧力提供理论依据,优化了线夹的服役性能和疲劳寿命。

Insulation piercing clamp is one of the most commonly used equipment in the erection of power lines. With the rapid development of the power industry, higher requirements are put forward for the reliability and heat resistance of the clamp. Aiming at the failure of insulation piercing clamps in actual working conditions due to large current carrying capacity, high voltage, poor heat dissipation conditions, etc., the test of the contact resistance of the clamp was carried out, and the electric-thermal-force multi-field coupling finite element model was established. The model considered wind loads to impose reasonable thermal boundary conditions and cyclic vibration loads, and analyzed the influence of different installation torques on the temperature and stress distribution of the clamp. The research results show that the greater the installation torque of the clamp, the smaller the contact resistance, temperature rise and maximum stress fluctuation range, and especially for 24-28 N $ \cdot $m, the maximum stress fluctuation range of the clamp drops sharply, which significantly improves the fatigue life of the clamp. The research results of this paper provide a theoretical basis for applying suitable pre-tightening force to the insulation piercing clamp in practical applications, and optimize the service performance and fatigue life of the clamp.