Seeking optimized transformer oil-based nanofluids by investigation of the modification mechanism of nano-dielectrics
Seeking optimized transformer oil-based nanofluids by investigation of the modification mechanism of nano-dielectrics
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DOI：
10.1039/d0tc01521k
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发表时间：
2020-06-14
影响因子：
6.4
通讯作者：
Wang, Yu
中科院分区：
文献类型：
--
作者：
Xu, Fan;Wang, Hongxia;Wang, Yu
弄清纳米添加剂在Transformer油基纳米流体中的具体性能和改性机理对实际应用具有重要意义。系统研究纳米添加剂的微观形貌、尺寸（D）和性能，有助于更直观地探索其改性机理。本文采用水热法设计并合成了均匀的Co（3）O（4）纳米颗粒（NPs）、纳米带（NB）和纳米片（NS），并将其均匀分散在含有少量添加剂的SKALN 25 X矿物油（MO）中。根据COMSOL Multiphysics的模拟结果，由于一维纳米材料具有最大的粒度比（长宽比），因此在强电场中由NB引起的电场畸变小于由NP引起的电场畸变。与纯油相比，MO/NPs、MO/NBs和MO/NSs的平均交流击穿电压（BDV）分别提高了63.7%、77%和61.6%。这意味着该改进高于大多数Transformer油基纳米流体（8-45%）。Co（3）O（4）是一种新型的磁性纳米添加剂，具有良好的改性效果。这项工作提供了一个有效的策略，揭示了完整的改性机制，并可能有助于指导这种流体的应用的可扩展性的研究。
Figuring out the specific performance and modification mechanism of nano-additives in transformer oil-based nanofluids is highly desired and significantly critical for practical applications. Systematically studying the micro morphologies, dimensions (D) and properties of nano-additives may help us to explore their modification principle more directly. Herein, we design and synthesize homogeneous Co(3)O(4)nanoparticles (NPs), nanobelts (NBs), and nanosheets (NSs) using a hydrothermal method and evenly disperse them in SKALN 25X mineral oil (MO) with a small amount of additive. Since 1D nanomaterials have the largest particle size ratio (length-to-width ratio), the electric field distortion caused by NBs in a strong electric field is smaller than that caused by NPs from the results of simulation by COMSOL Multiphysics. Compared with pure oil, the mean AC breakdown voltage (BDV) of MO/NPs, MO/NBs, and MO/NSs increased by 63.7%, 77%, and 61.6%, respectively. This means that the improvement is higher than that of most transformer oil-based nanofluids (8-45%). Co(3)O(4)is proved to be a new magnetic nano-additive with an excellent modification effect. This work provides an effective strategy for unravelling the full mechanism of modification and may be helpful to guide the research into the scalability of such fluids for applications.