Investigation on micro-mechanism of palm oil as natural ester insulating oil for overheating thermal fault analysis of transformers  

作　　者：Hanbo Zheng Xufan Li Yongji Feng Hang Yang Weijie Lv 

机构地区：[1]Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment,Guangxi University,Nanning,China

出　　处：《High Voltage》2022年第4期812-824,共13页高电压（英文）

基　　金：National Natural Science Foundation of China,Grant/Award Number:51907034;Specific Research Project of Guangxi for Research Bases and Talents,Grant/Award Number:2020AC19010。

摘　　要：In order to explore the pyrolysis mechanism of palm oil as the natural ester insulating liquid from the molecular aspect,the ReaxFF reactive force field was used to simulate the pyrolysis process of palm oil.Firstly,the molecular models of the four main molecules of palm oil-tripalmitin,trilinolein,triolein,and tristearin-are constructed via density functional theory(DFT).Secondly,the vibrational frequencies of the four molecules are calculated,so as to calculate the infrared(IR)spectra.Thirdly,molecular dynamics(MD)simulations employing the ReaxFF method are performed to simulate the pyrolysis reaction of the palm oil system under different temperatures,so as to observe the generation pathways of major products used in the dissolved gas analysis(DGA)in the transformer thermal fault analysis.Finally,hydrogen bonds in the pyrolysis process are counted.It is found that the number of hydrogen bonds gradually increased with the increase of pyrolysis time and pyrolysis temperature.It reveals why the life of the insulating paper immersed with natural esters is prolonged,and why the breakdown voltage is reduced slowly in the actual experiment from another perspective.This study can provide theoretical guidance and effective reference for the thermal fault analysis of an insulating liquid using palm oil as raw material.

关 键 词：FAULT PYROLYSIS MECHANISM 

分 类 号：TM41[电气工程—电器]