摘要
实验室中常采用加速老化方法获得硅油的老化试样,并根据试样中溶解气体组分及体积分数判断硅绝缘油的老化状态,但当前实验中仅能施加热应力或电应力,不能较好地反映硅油的真实工况。为解决这这一问题,文中开展了电热应力对硅油产气特性协同效应的实验研究。文中针对PMX-200型硅油,在200℃、25 kV下设计了硅油的热电老化、电热老化和电热联合老化等3组加速老化实验,通过对试样中的气体组分及体积分数分析,发现热电老化方式与电热联合老化方式下试样中溶解气体组分及体积分数最为接近,误差在7.41%~16.86%之间。文中结果表明实验中可用热电老化方式模拟硅油的实际老化条件。同时,文中结合ReaxFF力场,从原子水平上分析了硅油的热老化及电热老化机理。文中所得结论可为硅油的加速老化实验提供理论基础。
Accelerated aging method is often used to obtain aged samples of silicone oil in the laboratory,and the ag-ing condition of the silicone insulating oil can be judged in accordance with the composition and content of dissolved gas in the samples.However,only thermal stress or electrical stress can be applied in the current experiments,which cannot reflect the real condition of the silicone oil.For solving this problem,the synergistic effect of electro-thermal stress on gas production characteristics of silicon oil is studied experimentally.As for PMX-200 silicone oil in this pa-per,such three groups of accelerated aging experiments as thermo-electrical aging,electro-thermal aging and electro-thermal synergistic aging are designed at 200℃and 25 kV.It is found by analyzing the composition and content of dissolved gas in the aged samples that the composition and content of dissolved gas in the sample under thermal-elec-trical aging conditions are the most similar to those in the sample under electro-thermal synergistic aging conditions.The error is between 7.41%and 16.86%.The results in this paper show that the thermal-electrical aging method can be used to simulate the actual aging condition of the silicone oil.At the same time,based on ReaxFF force field,the thermal aging and electro-thermal aging mechanism of silicone oil are analyzed from the atomic level.The conclusion obtained in this paper can provide theoretical basis for accelerated aging experiment of the silicone oil.
作者
连鸿松
郑东升
刘慧鑫
赖永华
李长云
LIAN Hongsong;ZHENG Dongsheng;LIU Huixin;LAI Yonghua;LI Changyun(Fujian Electric Power Research Institute,SGCC,Fuzhou 350007,China;Shandong University of Science and Technology,Shandong Qingdao 266590,China)
出处
《高压电器》
CAS
CSCD
北大核心
2024年第1期100-107,117,共9页
High Voltage Apparatus
基金
国网福建省电力有限公司科技项目(521304190022)
电力行业技术标准《电力电缆终端用绝缘油选用导则》制定项目(能源20200124)。
关键词
电硅绝缘油
热电联合老化
产气特征
协同效应
silicone insulating oil
thermal-electrical synergistic aging
gas production characteristics
synergistic effect
