天然酯绝缘油与矿物绝缘油混合特性  

Mixing Characteristics of Natural Ester and Mineral Insulating Oil

作　　者：徐阳 焦夏男 黄伟嘉 林旭钊 胡婷 关伟民[3] XU Yang;JIAO Xianan;HUANG Weijia;LIN Xuzhao;HU Ting;GUAN Weimin(Guangzhou Power Supply Bureau of Guangdong Power Grid Co.,Ltd.,Guangzhou 510000,China;Wuhan ZD New Materials Co.,Ltd.,Wuhan 430074,China;Wuhan University,Wuhan 430072,China)

机构地区：[1]广东电网有限责任公司广州供电局,广东广州510000 [2]武汉泽电新材料有限公司,湖北武汉430074 [3]武汉大学,湖北武汉430072

出　　处：《绝缘材料》2022年第1期19-23,共5页Insulating Materials

基　　金：南方电网公司科技项目(GZHKJXM20180141)。

摘　　要：在天然酯绝缘油的众多应用场景中,使用天然酯绝缘油更换矿物绝缘油对在役老旧变压器进行延寿的技术在国内外受到广泛关注。换油过程中变压器中的残余矿物绝缘油不可避免地会与新添加的天然酯绝缘油混合。本研究将天然酯按体积分数0%、10%、20%、30%、40%、50%、60%、70%、80%、90%、100%与矿物绝缘油混合,并通过100℃、168 h加速热老化实验研究混合油样的性能变化规律。结果表明:随着天然酯含量的增加,老化油样击穿电压下降幅度减小,受含水量的影响变小,但是酸值增大;当天然酯体积分数超过30%时,老化油样的介质损耗因数比老化前有所减小;当矿物油体积分数为10%时,混合油样的燃点仅为天然酯的68.5%。In the application scenarios of natural ester insulating oil,the technology of using natural ester insulating oil to replace mineral insulating oil to prolong the service life of in-service old transformers has attracted extensive attention at home and abroad.During the oil replacing process,the residual mineral insulating oil in transformer will mix with the newly added natural ester insulating oil inevitably.In this study,the natural ester was mixed with mineral insulating oil,and its volume fraction was 0%,10%,20%,30%,40%,50%,60%,70%,80%,90%,100%,respectively.The properties of the mixed oils were studied by accelerated thermal ageing tests at 100℃for 168 h.The results show that with the increase of natural ester content,the degradation range of breakdown voltage of the aged oil decreases,and the effect of water content on the breakdown voltage of the aged oil decreases,while the acid value increases.When the volume fraction of the natural ester exceeds 30%,the dielectric loss factor of the aged oil is lower than that of the oil before ageing.When the volume fraction of mineral oil is 10%,the ignition point of the mixed oil is only 68.5%of that of natural ester.

关 键 词：天然酯 矿物油 变压器 绝缘油 热老化 

分 类 号：TM214[一般工业技术—材料科学与工程]