摘要
酯基绝缘油因其优异的热稳定性和环保特性,被视为大型充油设备中传统矿物油的理想替代品,但其在放电场强下的产气规律和机制尚不明确。本文基于ReaxFF反应力场模拟方法,以矿物油为对照,研究了天然酯和合成酯在电场强度和运行时间变化时的分解特性、特征气体生成规律及关键产气路径。结果表明:矿物油放电故障产气的临界电场强度高于酯基绝缘油,而天然酯放电故障产气的临界电场强度高于合成酯。在故障初期,绝缘油的分子结构显著影响气体生成类型和比例:矿物油主要生成H₂,天然酯主要生成C₂H₂和H₂,合成酯则表现出多样化气体生成。研究揭示了关键气体的生成机制,为酯基绝缘油的优化应用和材料设计提供了理论支持。
Ester-based insulating oils are regarded as ideal alternatives to traditional mineral oil in large oil-filled equipment due to their excellent thermal stability and environmental friendliness.However,their gas generation behavior and mechanisms under discharge field strength remain unclear.On the basis of ReaxFF reactive force field simulation method,taking mineral oil as a reference,the decomposition characteristics,characteristic gas generation rules,and key gas generation paths of natural ester and synthetic ester under varying electric field strengths and operating times were studied.The results show that the critical electric field strength for gas production in mineral oil discharge fault is higher than that of ester-based insulating oils,while the critical electric field strength for gas production in natural ester discharge fault is higher than that of synthetic ester.In the early stages of faults,the molecular structures of insulating oil significantly influence the types and proportions of generated gases:mineral oil primarily produces H_(2),natural ester mainly generates C_(2)H_(2) and H_(2),while synthetic ester exhibits diversified gas generation.This study reveals the production mechanisms of key gas,providing theoretical support for the optimal application and material design of ester-based insulating oils.
作者
齐伟惟
卢武
王哲铭
贾博文
许红运
王雅
QI Weiwei;LU Wu;WANG Zheming;JIA Bowen;XU Hongyun;WANG Ya(School of Electrical Engineering,Shanghai University of Electric Power,Shanghai 200090,China;Shanghai Secri Optical&Electric Cables Co.,Ltd.,Shanghai 200093,China)
出处
《绝缘材料》
北大核心
2025年第8期57-66,共10页
Insulating Materials
基金
国家自然科学基金资助项目(51707113)
上海市教育发展基金会、上海市教育委员会晨光计划项目(21CGA63)。
关键词
电场强度
酯基绝缘油
产气规律
产气机制
分子动力学
electric field strength
ester-based insulating oil
gas production law
gas production mechanism
molecular dynamics
