纳米SiO2/聚丙烯复合材料的电老化寿命评估
Evaluation of electrical aging life of nano SiO2/PP composites
高俊国 1张广威 1刘艳丽 1鞠惠丞 1刘力伟 1刘雄军 2韩啸2
作者信息
- 1. 哈尔滨理工大学 工程电介质及其应用教育部重点实验室,哈尔滨 150080
- 2. 江苏上上电缆集团科学技术研究院,溧阳 213300
- 折叠
摘要
探究新型环保材料聚丙烯(PP)绝缘和其纳米SiO2 复合材料的电老化寿命,为后期PP绝缘电缆应用可靠性提供理论支撑.基于电老化寿命公式-反幂定律,通过恒压加速老化试验估算了PP绝缘和SiO2/PP复合材料的寿命模型参数,再采用逐级升压加速老化试验对寿命指数n的可靠性进行评估.并对SiO2/PP复合材料进行结构表征和性能测试.结果表明,SiO2/PP6的寿命指数n为 14.61,相较PP6的 12.54提升了 16.51％;试验阶段发现在较低老化场强下 SiO2 的掺杂对 PP6的失效时间提升效果明显,预测SiO2/PP6在老化场强 25 kV·mm-1 以下的长期电老化寿命是PP6的 5倍以上.同时,掺杂纳米SiO2 使PP绝缘的工频介电损耗因数和损耗峰高度降低.基于电老化空腔理论,提出了SiO2 通过消耗热电子能量限制链段断裂,从而提升PP绝缘电老化寿命的观点.
Abstract
The electrical aging life of polypropylene(PP)insulation,a new environmentally friendly material,and its nano-SiO2 composites were investigated to provide theoretical support for the reliability of PP-insulated cables in later applications.Based on the electric aging life formula-inverse power method,the life model parameters of PP insulation and SiO2/PP composites were estimated by constant voltage accelerated aging test,and then the reliabi-lity of life index n was evaluated by stepwise accelerated aging test.The SiO2/PP composites were also structurally characterized and performance tested.The results show that the lifetime index n of SiO2/PP6 is 14.61,which is en-hanced by 16.51％compared with that of PP6 of 12.54.It is found in the experimental stage that the doping of SiO2 has a significant effect on the enhancement of PP6's time to failure at lower aging field strengths,and it is predicted that the long-term electrical aging lifetime of SiO2/PP6 is more than five times that of PP6 below the aging field strength of 25 kV·mm-1.Meanwhile,the doping of nano-SiO2 reduced the industrial frequency dielectric loss factor and lowered the loss peak height of PP insulation.Based on the electrical aging cavity theory,it is proposed that SiO2 enhances the electrical aging life of PP insulation by limiting the chain segment breakage by consuming hot electron energy.
关键词
聚丙烯绝缘/电老化寿命/纳米SiO2/加速电老化试验/复合材料Key words
polypropylene insulation/electric aging life/nano SiO2/accelerated electrical aging test/composite material引用本文复制引用
基金项目
国家自然科学基金(51577045)
黑龙江省博士后科研启动基金(LBH-Q19106)
出版年
2024
NETL
NSTL
万方数据