摘要
本研究旨在探究宽带隙纳米粒子(Co_(3)O_(4)和Al_(2)O_(3))对合成酯绝缘油(Midel-7131)绝缘性能的提升效果。通过向绝缘油中添加不同浓度(0.05~0.4 g/L)的纳米粒子,系统研究了其对绝缘油交流击穿电压的影响规律。结果表明:适量添加纳米粒子可显著提升绝缘油的绝缘性能,其中添加浓度为0.05 g/L Co_(3)O_(4)和浓度为0.2 g/L Al_(2)O_(3)分别使绝缘油的击穿电压提高31.1%和31.9%。通过热刺激去极化电流(TSDC)测试发现,纳米合成酯绝缘油表现出更高的电流峰值和陷阱能级,宽带隙可能是绝缘油陷阱能级提高的原因,从而使纳米合成酯绝缘油能够承受更高的击穿电压。Weibull统计分析进一步表明,除浓度为0.05 g/L Al_(2)O_(3)改性油样外,其余样品的击穿电压均符合Weibull分布。本研究证实了宽带隙纳米粒子通过调控陷阱特性提升绝缘油绝缘强度的有效性,为开发高性能纳米改性绝缘油提供了重要依据。
This study aims to investigate the enhancement effect of wide bandgap nanoparticles(Co_(3)O_(4) and Al_(2)O_(3))on the insulating properties of synthetic ester insulating oil(Midel-7131).By incorporating different concentrations(0.05−0.4 g/L)of nanoparticles to insulating oil,their influences on AC breakdown voltage of the insulating oil were systematically studied.The results show that the appropriate nanoparticle addition can significantly improve the insulating performance of insulating oil.Among them,the addition of 0.05 g/L Co_(3)O_(4) and 0.2 g/L Al_(2)O_(3) increase the breakdown voltage of the insulating oil by 31.1%and 31.9%,respectively.Thermally stimulated depolarization current(TSDC)tests reveales that nano synthetic ester insulating oils exhibit higher current peaks and trap energy levels.The wide bandgap may be responsible for the elevated trap levels,thereby enabling the nano synthetic ester insulating oils to withstand higher breakdown voltages.Weibull statistical analysis further indicates that,except for the 0.05 g/L Al_(2)O_(3)-modified oil sample,the breakdown voltages of all other samples conform to the Weibull distribution.This study confirms the effectiveness of wide-bandgap nanoparticles in improving the insulating strength of insulating oils through trap characteristic modulation,providing important insights for developing high-performance nano-modified insulating oils.
作者
赵鹏
刘广振
苏展
马伯杨
ZHAO Peng;LIU Guangzhen;SU Zhan;MA Boyang(Electric Power Research Institute,State Grid Tianjin Electric Power Co.,Ltd.,Tianjin 300384,China;State Grid Tianjin Electric Power Co.,Ltd.,Tianjin 300010,China)
出处
《绝缘材料》
北大核心
2025年第8期82-88,共7页
Insulating Materials
