矿用干式变压器诺美(Nomex)绝缘纸多因子老化过程的降解规律  

Aging Degradation Law of Nomex Insulating Paper for Mining Dry-Type Transformer Under Multi-Factor

作　　者：曹金梅 李璐[1] 张瑞 李勇智 王政宇 陈昆 宋建成[1] CAO Jinmei;LI Lu;ZHANG Rui;LI Yongzhi;WANG Zhengyu;CHEN Kun;SONG Jiancheng(Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control,College of Electrical and Power Engineering,Taiyuan University of Techno-logy,Shanxi 030024,China;Zhengzhou Power Supply Company,State Grid Henan Electric Power Company,Henan 450000,China;State Grid Changzhi Power Supply Company,Shanxi 046011,China)

机构地区：[1]太原理工大学电气与动力工程学院,煤矿电气设备与智能控制山西重点实验室,山西030024 [2]国网河南电力公司郑州供电公司,河南450000 [3]国网长治供电公司,山西046011

出　　处：《材料导报》2020年第22期22195-22200,共6页Materials Reports

基　　金：国家自然科学基金(51577123)。

摘　　要：矿用干式变压器匝间绝缘诺美(Nomex)纸的绝缘状态直接影响煤矿井下的供电可靠性和生产安全性,研究其老化规律和分解特性,可以为变压器的状态评估、寿命分析及故障诊断技术奠定理论基础。本工作进行了Nomex绝缘纸多因子联合作用下的加速老化试验,深入分析了电压、温度和水分对绝缘纸聚合度的影响;通过热分析试验探究了Nomex绝缘纸热解动力学参数随聚合度的变化规律。研究结果表明:电压、温度和水分三个老化因子均会加速Nomex绝缘纸老化,其中在有水分作用时,和电压相比,温度对绝缘老化的影响更大;随着老化程度的加深,绝缘纸活化能呈现先增后减的趋势,热焓值与聚合度呈指数衰减关系,可见热焓值可作为评估绝缘纸性能的主要参数之一。The insulation state of Nomex paper used in mining dry Transformer could directly influence the reliability of power supply and production safety in underground coal mine,therefore,it is necessary to study the aging law and decomposition characteristics of Nomex paper,which could lay the theoretical foundation for the state evaluation,life analysis and fault diagnosis of mining dry Transformer.In this paper,the accele-rated aging test under the multi-factor combination of Nomex insulation paper was carried out.The effects of voltage,temperature and moisture on the polymerization degree of Nomex paper were analyzed in detail.The variation of kinetic parameters of Nomex paper with DP was investigated by thermal analysis.The results showed that voltage,temperature and moisture factors all accelerated the aging of Nomex insulation paper,and that temperature had a greater effect on insulation aging than voltage when there was moisture;With the deepening of the aging degree,the activation energy of Nomex paper shows the trend of first increasing and then decreasing.The thermal enthalpy value and the degree of polymerization are exponentially attenuated.It could be seen that the thermal enthalpy value can be used as one of the main parameters to evaluate the performance of Nomex insulation paper.

关 键 词：干式变压器 Nomex绝缘纸 多因子老化 聚合度 活化能 热焓值 

分 类 号：TM852[电气工程—高电压与绝缘技术]