高温对交联聚乙烯电缆/硅橡胶预制件接头界面压力影响的仿真研究

Simulation of Interfacial Pressure between XLPE Cable and Silicon Rubber Prefabricated Joint Coupled with High Temperature

高压电缆接头与电缆主绝缘间的握紧力是确保输电线路安全运行的关键。实际电缆及附件运行中的温升可能导致界面压力变化,但由于接头与电缆过盈配合,面压测量困难,难以实时检测面压和判断老化情况。针对电缆附件用硅橡胶绝缘,通过实际测量电缆绝缘交联聚乙烯及附件硅橡胶料在不同温度下的弹性模量值,基于塑性力学理论,利用ANSYS软件建立10 kV电缆接头三维仿真模型,分析了温度变化对电缆接头界面压力的影响。

The grip strength between high voltage cable joint and cable main insulation is the key factor to ensure the safety of electrical transmission line. The increasing temperature may change the interface pressure during the actual operation of cable and accessories. But it is too complicated to measure the pressure at the interface due to shrink fit between joint and cable insulation. As a result, it is difficult to detect interface pressure and judge aging state. Focused on silicone rubber （SR） used in the cable accessory, the elasticity moduli of XLPE and SR sample were measured under different temperature. Then based on the theory of plastic mechanics, the three dimensional simulation model for 10kV cable joint was built by ANSYS software. According to the model, the effect of temperature on interface pressure of cable joint was analyzed.