金属钝化剂对变压器多重硫化物防护效果的微观机制  

Micromechanism of Protective Effect of Metal Passivator against Multiple Sulfides in Power Transformers

作　　者：郑璐 戴景琪 高国峰 丛浩熹 杨玥 焦在滨[4] ZHENG Lu;DAI Jing-qi;GAO Guo-feng;CONG Hao-xi;YANG Yue;JIAO Zai-bin(Inner Mongolia Power Co.,Ltd.,Inner Mongolia Electric Power Science&Research Institute,Hohhot 010020,China;Key Laboratory of Power System Intelligent Dispatch Grid Simulation Enterprise of Inner Mongolia Autonomous Region,Hohhot 010020,China;Inner Mongolia Power Co.,Ltd.,Hohhot 010000,China;School of Electrical Engineering,Xi an Jiaotong University,Xi an 710045,China;Inner Mongolia Power Co.,Ltd.,Xilingol Power Supply,Xilinhot 026000,China;State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources,North China Electric Power University,Beijing 102206,China)

机构地区：[1]内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司,呼和浩特010020 [2]内蒙古自治区新型电力系统智能电网企业重点实验室,呼和浩特010020 [3]内蒙古电力(集团)有限责任公司,呼和浩特010000 [4]西安交通大学电气工程学院,西安710045 [5]内蒙古电力(集团)有限责任公司锡林郭勒供电分公司,锡林浩特026000 [6]华北电力大学新能源电力系统国家重点实验室,北京102206

出　　处：《科学技术与工程》2024年第36期15497-15503,共7页Science Technology and Engineering

基　　金：内蒙古电力(集团)有限责任公司科技项目(2024-4-53)。

摘　　要：目前对钝化剂的最佳添加浓度和对含多重硫化物的油纸绝缘系统防护有效性研究较少,为此选取应用较为广泛的钝化剂甲基苯并三氮唑(TTA)和3种典型硫化物二苄基二硫醚、十六硫醇和苯并噻吩,采用反应分子动力学仿真模拟,通过测量范德华能、分子链运动(MSD)、弹性模量和氢键数目等参数,研究不同质量分数的钝化剂TTA加入后,对多重硫化物的防护效果。结果表明:TTA钝化剂可以有效防护含有多重硫化物的变压器油纸绝缘系统,能够一定程度上阻碍硫化物和铜的反应,进而有效延缓油纸绝缘的老化速度;针对绝缘油,在加入的钝化剂TTA质量分数为150×10^(-6)之前,防护效果随着钝化剂含量的增加而增加,但在150×10^(-6)之后,由于TTA溶解度的原因,反而一定程度上加速了绝缘油的老化,但老化速度还是低于空白对照组;针对绝缘纸,防护效果随着钝化剂含量的增加而增加,钝化剂TTA对绝缘纸机械性能并无影响;综合经济性和防护效果来看,TTA的最佳防护质量分数为50×10^(-6)。At present,there are few studies on the optimal additive concentration of passivator and the protective effectiveness of oil-paper insulation system containing multiple sulfides.Therefore,the passivator methylbenzotriazole(TTA),which was widely used,and three typical sulfides,dibenzyl disulfide,cetylmertan and benzothiophene,were selected and simulated by reaction molecular dynamics.By measuring the van der Waals energy,molecular chain movement(MSD),elastic modulus and hydrogen bond number,the protective effect of TTA with different mass fractions on multiple sulfides was studied.The results show that TTA passivating agent can effectively protect the transformer oil-paper insulation system containing multiple sulfides,and can block the reaction of sulfide and copper to a certain extent,and effectively delay the aging rate of oil-paper insulation.For insulating oil,before the mass fraction of passivating agent TTA is 150×10^(-6),the protective effect increases with the increase of passivating agent content.However,after 150×10^(-6),the aging of insulating oil is accelerated to a certain extent due to the solubility of TTA,but the aging rate is still lower than that of the blank control group.For insulating paper,the protective effect increases with the increase of passivating agent content,and TTA has no effect on the mechanical properties of insulating paper.From the perspective of comprehensive economy and protective effect,the best protective mass fraction of TTA is 50×10^(-6).

关 键 词：变压器 油纸绝缘系统 钝化剂 分子动力学 防护效果 

分 类 号：TM853[电气工程—高电压与绝缘技术]