【摘要】 硅橡胶材料特有的憎水迁移性是复合电力设备能够防治污闪事故的重要原因,而油的存在会加重污秽积累。当套管漏油后,绝缘油会以油膜的形式覆盖在硅橡胶材料表面,污秽积累形成一层油泥,硅橡胶材料特有的憎水迁移性能会受到极大的影响,表面耐压值也会受到改变。为此,文中以套管用高温硫化硅橡胶(HTV)材料为研究对象,通过加速热老化得到老化试样,并通过人工涂抹含油污秽模拟漏油事故,分析表面油污对硅橡胶材料憎水迁移性能的影响;通过闪络试验,研究表面油污对硅橡胶污闪电压的影响。结果表明:热老化使HTV表面出现孔洞和沟壑,内部疏松,影响了小分子的迁移通道,稳态憎水性能变差;涂抹油污后,老化硅橡胶初始憎水性更高,稳态憎水性变差,其污闪电压随污秽度的增加而降低。更多还原

【Abstract】 Hydrophobicity transfer characteristic of silicone rubber is a reason for electrical equipment to protected from the pollution flashover accidents,however the presence of oil will increase the accumulation of pollution. When the oil is leaking,the oil will cover the surface of silicone rubber in the form of oil film,and the contamination accumulates to form a layer of sludge. The hydrophobicity transfer characteristic of silicone rubber will be greatly affected and the withstand voltage will be changed. In this paper,the aged HTV of oil-immersed compound casing is studied though thermal aging,and the effects of oil on the hydrophobic transfer characteristics of HTV are studied by artificial coating. And the influence of surface oil on the pollution flashover voltage of silicone rubber is studied through flashover test. The results show that after aging,holes and gully appeared on the HTV surface,and the interior structure becomes loose,which influence the transfer path of LMW. Hydrophobic performance of steady-state deteriorated. After smearing oil,the aging silicone rubber has higher initial hydrophobicity but worse steady hydrophobicity.And its pollution flashover voltage decreases with the increase of fouling.更多还原