纳米粒子对交联聚乙烯直流电缆中绝缘电阻率温度系数的影响

Effect of Nanoparticles on Temperature Coefficient of Resistivity in DC XLPE Insulation Cable

为减少电阻率随温度的变化,采用了加入纳米填料的方法来降低交联聚乙烯绝缘料的电阻率温度系数,通过与传统纯聚乙烯绝缘料的性能对比验证纳米粒子掺杂对性能的影响。在所得电-热性能数据的基础上,模拟仿真采用低电阻率温度系数绝缘料的100 kV直流电缆绝缘层中的场强分布。结果表明:添加纳米粒子降低了交联聚乙烯对温度的敏感性,同时削弱了电缆绝缘层中的电场畸变率,说明纳米粒子对交联聚乙烯的电阻率温度系数有一定的调控作用。

In order to reduce the variation of resistivity with temperature, nano fillers were added into the crosslinked polyethylene(XLPE) cable insulation material to decrease the temperature coefficient of resistivity. The effect of nano fillers on the property was verified by comparing with the traditional XLPE insulation material. Based on the obtained electric-thermal properties data, the distribution of electric field intensity in the 100 kV DC cable insulation layer with low temperature coefficient of resistivity was simulated. The results show that the doping of nano fillers reduces the sensibility of XLPE on temperature, and decreases the distortion rate of electric field in the cable insulation. It is proved that the nanoparticles have certain effect on the temperature coefficient of resistivity for XLPE.