TiO2纳米粉体对变压器油工频击穿性能的影响

纳米半导体晶体表面存在大量的本征表面态,当晶体与变压器油接触时可生成能够有效捕获电子的表面态.考察了不同浓度TiO2纳米粒子对变压器油的改性作用,并以具有不同表面修饰状态的纳米二氧化钛粉体为改性剂,对克拉玛依25号变压器油进行改性,研究了纳米粉体表面修饰种类对改性油绝缘性能的影响.击穿性能测试和拟合结果表明:TiO2半导体纳米粉体可以提高变压器油的击穿性能,在一定浓度范围内,TiO2纳米粒子浓度越大,改性变压器油的工频绝缘性能越好;TiO2纳米粉体的表面修饰成分会影响变压器油的击穿性能,乙酸、丙酸和丙酸+己胺的改性作用依次增大;修饰物分子非极性链的越长,对变压器油击穿性能的改善越好.

Effect of TiO2 Nano-powder on the Industrial Frequency Power Breakdown Properties of Transformer Oil

There are plenty of intrinsic cation states on the surface of nano-semiconductor crystals.When the crystals contact the transformer oil,surface states that can capture electrons easily are formed.In this paper,TiO2 nano-powders with different surface modifications have been used to improve the property of transformer oil(Kelamayi 25).The modification effects of nano-power’s on insulating property of transformer oils have been investigated.And the modifying effects of TiO2 nano-powder with different concentrations on transformer oil have been studied.The breakdown property tests and fitting results show that TiO2 nano-powder can improve the breakdown properties of transformer oil and within some concentrations,the higher the concentration of TiO2 nano-powder,the better the power frequency insulating property of modifying transformer oil.Besides,The modifying agents play a key role in the dispensability of TiO2 nan-powder in the transformer oil.With the increasing of nonpolar segment in the modifying agent,the breakdown property of the modified oils gets more enhancements.