摘要
为了探究快速暂态过电压(VFTO)对环氧树脂击穿性能的影响,本文制得环氧树脂试样,并在20 kV与40 kV下对试样进行1 000次VFTO老化试验,通过红外光谱、扫描电子显微镜、介电谱及击穿试验,研究了VFTO老化对环氧树脂化学结构、微观形貌、介电参数与击穿性能的影响。结果表明:经VFTO老化后,环氧树脂表面C-O-C键和C=O含量减少,试样内部缺陷增多,松弛极化行为增强,电气强度下降。在20 kV和40 kV VFTO老化作用后,环氧树脂的电气强度分别降低了14.89%和25.67%。通过分析发现,VFTO老化作用后,环氧树脂内部大分子链断裂导致缺陷增多,这是其电气强度下降的主要原因。
In order to explore the effect of very fast transient overvoltage(VFTO)on the breakdown properties of epoxy resin,epoxy resin samples were prepared and conducted 1000 times of VFTO ageing tests at 20 kV and 40 kV,respectively.The effects of VFTO ageing on the chemical structure,micromorphology,dielectric parameters,and breakdown properties of the epoxy resins were studied by infrared spectroscopy,scanning electron microscopy,dielectric spectroscopy,and breakdown experiment.The results show that after VFTO ageing,the contents of C-O-C bond and C=O bond in epoxy resin decrease,the internal defect increases,the relaxation behavior enhances,and the electric strength decreases.After VFTO ageing at 20 kV and 40 kV,the electric strength of epoxy resin decreases by 14.89%and 25.67%,respectively.Through analysis,it is found that after the VFTO ageing,the internal macromolecular chains of the epoxy resin were broken,leading to an increase of defects,which is the main reason for the decrease of its electric strength.
作者
潘绍明
张磊
赵坚
苏毅
饶夏锦
陈梁远
黎大健
PAN Shaoming;ZHANG Lei;ZHAO Jian;SU Yi;RAO Xiajin;CHEN Liangyuan;LI Dajian(Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment,Electric Power Research Institute of Guangxi Power Grid Co.,Ltd.,Nanning 530023,China;Guangxi Power Grid Co.,Ltd.,Nanning 530023,China)
出处
《绝缘材料》
CAS
北大核心
2024年第1期46-50,共5页
Insulating Materials
基金
广西电网有限责任公司科技项目(GXKJXM20220024)。
关键词
VFTO
环氧树脂
电气强度
电老化
VFTO
epoxy resin
electric strength
electrical ageing
