电工技术学报  2018, Vol. 33 Issue (zk1): 227-233    DOI: 10.19595/j.cnki.1000-6753.tces.180115
高电压与绝缘 |
基于热重红外联用的复合绝缘子芯棒热解特性研究
谢从珍1, 曾磊磊1, 甘永叶1, 贲成1, 周福升2
1. 华南理工大学电力学院 广州 510640;
2. 南方电网科学研究院有限责任公司 广州 510080
Study on Pyrolysis Characteristics of Fiber Reinforced Plastic Rod of Composite Insulators Based on TG-FTIR Analysis
Xie Congzhen1, Zeng Leilei1, Gan Yongye1, Ben Cheng1, Zhou Fusheng2
1. School of Electrical Power South China University of Technology Guangzhou 510640 China;
2. China South Power Grid International Co. Ltd Guangzhou 510080 China
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摘要 近年来我国交流500kV输电线路复合绝缘子异常发热故障时有发生,给输电线路安全运行带来隐患。为了研究复合绝缘子芯棒的受热分解机理,该文采用热重红外联用技术(TG-FTIR)和分布式活化能模型(DAEM)探讨不同升温速率下芯棒的热解过程及气体产出规律。结果表明:不同升温速率下的热重和微分热重曲线形状基本一致,且随着升温速率的增大,热解起始和终止温度均向高温侧移动;芯棒材料的热失重主要发生在270~620℃温度范围内,并分为两个阶段:第一阶段(270~470℃)样品的热失重主要由环氧树脂基体发生热分解所致,气体产物主要为醛类、酮类、酸类和CH4;第二阶段(470~620℃)样品的热失重则是由于环氧树脂基体热解生成的残渣进一步发生氧化反应所致,气体产物主要为H2O、CO2及CO等;芯棒热解过程中的表观活化能在104~524kJ/mol范围内变化,并且活化能上升对应热解第一阶段,活化能下降对应热解第二阶段。研究结果可为进一步探讨芯棒材料的热老化机理提供理论参考。
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谢从珍
曾磊磊
甘永叶
贲成
周福升
关键词 复合绝缘子玻璃钢芯棒热解热重红外联用分布式活化能模型    
Abstract:In recent years, abnormal heating phenomenon have occurred in composite insulators of AC 500 kV transmission lines in China, which have brought potential trouble to the safely operation of transmission lines. In order to study the mechanism of thermal decomposition of the composite insulator core, the article adopted the thermogravimetric infrared technology (TG-FTIR) and distributed activation energy model (DAEM), discussed the pyrolysis process and gas production law at different heating rate. The results show that both TG and DTG curves of the mandrel exhibit an identical variation tendency under different heating rates, and the initial and final temperatures of the pyrolysis move upwards with the increase of heating rate. The weight loss occurs mainly in the temperature ranging from 270~620℃, which can be divided into two stages. In the first stage (270~470℃), the thermal weight loss of the mandrel is mainly caused by decomposition of the epoxy resin matrix, during which the main gases products are aldehydes, ketones, acids and CH4. In the second stage (470~620℃), the thermal weight loss is due to the further oxidation of the residues produced by pyrolysis, the main gases outcome in this process are H2O, CO2 and CO. The apparent activation energy during the pyrolysis ranges from 104~524kJ/mol, and the increase and decrease of activation energy correspond to the first and second stage of the pyrolysis, respectively. Those results provide theoretical references for further relevant studies.
Key wordsComposite insulator    fiber reinforced plastic rod    pyrolysis    thermogravimetric infrared technology    distributed activation energy model   
收稿日期: 2018-01-21      出版日期: 2018-09-26
PACS: TM85  
基金资助:中国南方电网公司基础性、前瞻性科技项目(SEPRI-K164003)和特高压工程技术(昆明、广州)国家工程实验室开放基金(NEL201710)资助
通讯作者: 曾磊磊 男,1993年生,硕士研究生,研究方向为输电线路绝缘材料及缺陷诊断。E-mail:478011514@qq.com   
作者简介: 谢从珍 女,1973年生,教授,博士生导师,研究方向为输电线路绝缘材料及缺陷诊断、输变电设备在线监测及大数据。E-mail:congzhen168@163.com
引用本文:   
谢从珍, 曾磊磊, 甘永叶, 贲成, 周福升. 基于热重红外联用的复合绝缘子芯棒热解特性研究[J]. 电工技术学报, 2018, 33(zk1): 227-233. Xie Congzhen, Zeng Leilei, Gan Yongye, Ben Cheng, Zhou Fusheng. Study on Pyrolysis Characteristics of Fiber Reinforced Plastic Rod of Composite Insulators Based on TG-FTIR Analysis. Transactions of China Electrotechnical Society, 2018, 33(zk1): 227-233.
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