植物油浸绝缘纸的热稳定性及其对气隙放电发展的影响  

Thermal Stability of Vegetable Oil Impregnated Pressboard and Its Influence on the Air-gap Discharge Development

作　　者：崔鲁[1] 陈伟根[1] 张知先 李剑[1] 相晨萌[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学)

出　　处：《中国电机工程学报》2018年第4期1248-1254,共7页Proceedings of the CSEE

基　　金：国家杰出青年科学基金(51425702);国家自然科学基金专项基金创新群体基金项目(51321063);高等学校学科创新引智计划“111”计划(B08036)~~

摘　　要：随着植物绝缘油变压器的推广应用,研究植物油纸绝缘气隙放电发展及其影响因素具有重要意义。该文采用热重分析技术分析了不同温度下植物油浸绝缘纸板的热裂解情况;基于典型气隙缺陷模型进行了从起始放电至绝缘击穿全过程的局部放电试验。结果表明：相比于矿物油浸绝缘纸板,植物油浸绝缘纸板的热稳定性更好;随着气隙放电的发展两种油纸绝缘放电脉冲相位区间均呈现变宽趋势和不同程度的前移现象,植物油纸绝缘不同放电阶段放电信号相位前移现象更为明显,局部放电量相对较低。研究结果为通过局部放电信号诊断植物绝缘油变压器内部潜伏性缺陷奠定了基础。With the increasing application of vegetable oil transformers,it is necessary to study the air-gap partial discharge（PD） development and its effect factors of vegetable oil-paper insulation.Thermogravimetry analysis method was adopted in this paper to analyze the pyrolysis of vegetable oil impregnated pressboard under different temperature.Based on typical air-gap defect model,PD experiments from incipient discharge to insulation breakdown were carried out.The results show that： compared with mineral oil impregnated pressboard,vegetable oil impregnated pressboard performs better thermal stability; with the development of PD process,both two oil-paper insulations exhibit wider and forward trend of phase distribution,and vegetable oil-paper insulation displays more remarkable forward trend,with lower discharge magnitude.These research results lay the foundation for diagnosing the latent defects in vegetable oil transformers by PD signals.

关 键 词：变压器 植物油纸绝缘 热稳定性 气隙放电 

分 类 号：TM835[电气工程—高电压与绝缘技术]