植物绝缘油中含水量对其绝缘性能的影响  

Influences of Moisture Content on Insulation Properties of Vegetable Insulating Oil

作　　者：邹平[1] 李剑[1] 孙才新[1] 廖瑞金[1] 张召涛[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《高电压技术》2011年第7期1627-1633,共7页High Voltage Engineering

基　　金：国家自然科学基金(50877080);霍英东教育基金会资助项目(111062)~~

摘　　要：植物绝缘油不仅解决了矿物绝缘油在耐高温和环保方面的不足,而且具有良好的电气性能,是目前国际上重点研究的新型液体绝缘材料。绝缘油的含水量对其绝缘性能的影响极为显著。由于植物绝缘油的饱和含水量高于矿物绝缘油,为研究含水量对植物绝缘油绝缘性能的影响规律,分析了精炼处理后的菜籽绝缘油含水量对绝缘油的击穿电压的影响;采用介电谱测试仪测量分析了不同含水量的菜籽绝缘油的相对介电常数和介质损耗因数及其随频率变化的规律,并参照相关标准对菜籽绝缘油的体积电阻率进行了研究。测试结果表明,在油中水分饱和度相同的情况下,植物绝缘油比矿物绝缘油的击穿电压高,随水分饱和度的增加,植物绝缘油击穿电压下降的趋势较矿物油的缓慢;而在水分饱和度相同时,植物绝缘油的实际水分质量浓度水分饱和度较高,说明水分对植物绝缘油击穿电压的影响没有矿物油那么明显;水分饱和度<50%时,对其绝缘性能的影响较小;水分饱和度≥100%时,对绝缘性能影响显著。Due to the fact that saturated moisture content of vegetable insulating oil is greater than that of mineral in sulating oil, it is necessary to investigate the characteristics of moisture influencing the insulation properties of vegetable insulating oil. We analyzed the influence of moisture content in a refined rapeseed insulating oil on breakdown voltage of the oil, measured the relative permittivity and dissipation factor of the rapeseed insulating oil with various moisture contents by using a dielectric spectrometer, analyzed the characteristics of the two parameters versus frequency, and tested the volume resistivity of the rapeseed insulating oil specimens according to relevant standards.Measurement results show that the breakdown voltage of vegetable insulating oil are higher than that of insulating mineral oil at the same relative moisture content. With the increase of moisture content, the breakdown voltage of insulating vegetable oil declines more slowly than that of insulating mineral oil. The absolute moisture content of insulating vegetable oil is higher at the same relative moisture content, indicating that it has slight influences on breakdown voltage of vegetable insulating oil. When the relative moisture content is lower than 50%, the insulation properties of the rapeseed insulating oil are little affected. When the relative moisture content exceeds the saturated moisture content of the oil, the insulation properties of the rapeseed insulating oil are remarkably affected.

关 键 词：植物绝缘油 击穿电压 绝缘性能 含水量 相对介电常数 介质损耗因数 体积电阻率 

分 类 号：TM215.4[一般工业技术—材料科学与工程]