交联聚乙烯电缆空间电荷与理化性能的关系

Relationship between Space Charge and Physicochemical Properties of AC XLPE Cables

针对高压交联XLPE电缆,通过对未老化、加速老化1年和实际运行30年的电缆绝缘的空间电荷特性、力学性能及理化性能进行研究,分析了老化过程中电缆绝缘空间电荷分布与理化性能之间的关系。结果表明:沿电缆径向由内向外,未老化电缆电荷积累量增加,加速老化1年的电缆电荷积累量呈下降趋势,实际运行30年的电缆电荷积累量上升。结合力学性能及理化分析认为,加速老化电缆绝缘老化起始于绝缘内侧,并且影响到绝缘中间部位;而实际运行30年的电缆绝缘老化起始于绝缘外侧。

Study was made on the space charge characteristics, mechanical properties and physicochemical properties of new HVAC XLPE cable insulation, the insulation with accelerated aging for one year and with practical operating for 30 years. Then a relationship between space charge distribution and physico- chemical properties of the HVAC cable insulation was built. The results show that along the radial direc- tion from inner to outer, the mean space charge accumulation of the new cable and that with practical op- erating for 30 year increases, and the value of that with accelerated aging for one year decreases. It was concluded from analysis that the aging of the accelerated aging cable insulation starts from the inside of insulation, and that of the cable insulation with practical operating for 30 years starts from the outside.