基于热失重分析的盆式绝缘子热分解活化能的计算方法  

Calculation Method of Thermal Decomposition Activation Energy of Basin-type Insulators Based on TG Analysis

作　　者：金虎 李锐海 孟晓波 任鹏[2] 丛浩熹 李庆民[2] JIN Hu1, LI Ruihai1, MENG Xiaobo1, REN Peng2, CONG Haoxi2, LI Qingmin2(1. Electric Power Research Institute, CSG, Guangzhou 510663, China; 2. School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, Chin)

机构地区：[1]南方电网科学研究院有限责任公司,广州510663 [2]华北电力大学电气与电子工程学院,北京102206

出　　处：《高压电器》2018年第5期44-48,55,共6页High Voltage Apparatus

基　　金：国家自然科学基金(51477051;51737005);南方电网公司科技项目(SEPRI-K175010)~~

摘　　要：气体绝缘金属封闭开关(GIS)在电力系统中应用广泛,其中盆式绝缘子长期在电热应力作用下不断发生老化降解,严重情况下可能会引发重大事故。盆式绝缘子的老化降解实际上是化学反应过程,因此研究盆式绝缘子的热分解过程具有重要意义。文中基于热分析动力学原理,采用热失重法分析了盆式绝缘子在5种不同升温速率下的热分解过程,采用Flynn-Wall-Ozawa法和Kissinger法计算了盆式绝缘子的活化能。研究结果表明,采用Flynn-Wall-Ozawa第1种方法和Kissinger方法计算结果基本一致,由Flynn-Wall-Ozawa第2种方法计算得到的活化能起初随着转化率的增加而增大,在转化率0.12处达到峰值,然后随着转化率的增大略有下降,并给出了这一现象的微观解释。上述研究对于准确计算盆式绝缘子的活化能,进而为揭示老化机理和评估老化程度具有一定的指导意义。Gas-insulated metal-enclosed switches（GIS）are widely used in power systems. Among them,basin-typeinsulators have been subjected to aging degradation under the effect of electro thermal stress for a long time,and seri-ous accidents may be caused in severe cases. Aging degradation of basin-type insulator is actually a chemical reac-tion process,so it is of great importance to study the thermal decomposition process of basin-type insulator. Based onthe principle of thermal analysis,the thermal decomposition process of the basin-type insulator under five differentheating rates is analyzed by TG method. The activation energy of the basin-type insulator is calculated by the Flynn-Wall-Ozawa method and the Kissinger method. The results show that the calculated results by the first method of Fly-nn-Wall-Ozawa method and Kissinger method are basically the same. The activation energy calculated by the secondmethod of Flynn-Wall-Ozawa method initially increases with the increase of conversion rate. Peak at a conversionrate of 0.12,then decrease slightly as the conversion rate increases and last gives a microscopic explanation of thisphenomenon. The above research has certain guiding significance for accurately calculating the activation energy ofthe basin-type insulator,revealing the aging mechanism and evaluating the aging degree.

关 键 词：GIS 盆式绝缘子 热分析动力学 活化能 

分 类 号：TM216[一般工业技术—材料科学与工程]