摘要
直流场设备外绝缘污闪和湿闪特性很大程度受表面涂覆的室温硫化硅橡胶(RTV)绝缘特性的制约,RTV良好的性能主要体现在优异的憎水性及憎水迁移性。为研究变压器套管等设备漏油对RTV绝缘特性的影响,选取普通RTV和经纳米SiO2、氟化聚硅氧烷协同改性的纳米复合RTV两种材料,借助扫描电镜(SEM)、x射线能谱(EDS)和万能试验机对材料内部结构和力学性能进行了比较研究。参照GB 1739—1989对2种RTV进行浸油加速老化试验,研究了不同浸油时间和不同恢复时间下RTV的憎水恢复特性,分析了环境因素和污秽成分对有无浸油的RTV憎水性迁移特性的影响。结果表明,高温变压器油降低了RTV憎水性和憎水恢复性能,协同改性的纳米复合RTV材料力学性能、耐油性均优于普通RTV。RTV憎水性恢复快慢及恢复程度与浸油老化时间密切相关,并随之呈现规律性变化。污秽成分、环境温度和相对湿度对RTV憎水迁移性有明显影响。
Characteristics of pollution Flashover and raining flashover of DC equipment are restricted by their surface RTV coating insulation characteristics.In order to research the influence of oil leakage of transformer bushing on RTV insulation characteristics,ordinary RTV and insulation nanocomposite modified by nano-SiO2 and fluoride polysiloxane were selected,and the microstructure and mechanical properties of RTV materials were comparatively investigated by using SEM,EDS and universal testing machine.By the national standard GB 1739-1989,oil accelerated aging immersion tests were investigated,hydrophobic recovery characteristics of RTV in different immersion oil time and recovery time were studied,and the influences of environmental factors and component of pollution on hydrophobicity of RTV at pre-and post-oil impregnation were analyzed.The results indicate that the hydrophobicity and hydrophobic recovery characteristics of RTV are decreased by high-temperature transformer oil,and comprehensively modified RTV nano-composite materials show better characteristics than common RTV on mechanical properties and oil resistance.According to the hydrophobicity,the recovery speed and degree of RTV closely depend on the immersion oil duration,and regularly vary during a given immersion oil period.Pollution composition,ambient temperature and relative humidity have obvious effects on hydrophobic recovery characteristics of RTV.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2011年第1期91-98,共8页
High Voltage Engineering
基金
国家重点基础研究发展计划(973计划)(2009CB724500)~~
关键词
绝缘特性
室温硫化硅橡胶
憎水性恢复率
变压器油
耐油性
憎水迁移性
insulation characteristic
RTV
hydrophobicity recovery rate
transformer oil
oil resistance
hydrophobicity transfer
