基础油烃组成对油纸复合体系介质损耗因数的影响

EFFECT OF HYDROCARBON COMPOSITION OF BASE OIL ON DIELECTRIC DISSIPATION FACTOR OF OIL-PAPER COMPOSITE SYSTEM

为更好地指导变压器油新产品开发及运行设备故障诊断,在不同温度下进行了基础油烃组成对油纸复合体系介质损耗因数(简称介损)影响的考察。结果表明:低温下,基础油饱和烃含量和芳烃含量变化对油纸复合体系介损影响不明显;随着温度升高,基础油链烷烃含量和芳烃含量越高,油纸复合体系介损越大;同时,硫含量越高,油纸复合体系介损越大,而不同温度下硫含量对介损的影响差别不大。用于油纸复合体系变压器油的理想基础油为含有适量芳烃的环烷基油。

Dielectric dissipation factor is a very effective key parameter to judge the insulation condition of electrical equipment and the quality of insulating materials.In order to better guide the development of new transformer oil products and provide more exact fault diagnosis of operating equipment,the influence of hydrocarbon composition of base oil on dielectric dissipation factor of oil-paper composite system was studied at different temperatures.The results showed that the change of the content of saturated hydrocarbon and aromatic hydrocarbon in base oil had no obvious effect on the dielectric dissipation factor of oil immersed paperboard at low temperature,and the higher the content of alkane and aromatic hydrocarbon in base oil was,the greater the dielectric dissipation factor of oil immersed paperboard was.At the same time,the higher the sulfur content in base oil was,the greater the dielectric loss of the oil-paper composite system was,but the effect of sulfur content on dielectric loss at different temperatures was not significant.The ideal base oil for oil-paper composite system transformer oil is naphthenic base oil containing proper amount of aromatic hydrocarbons.