Pérez-Rosa Daniel, Montero Andrés, García Belén, Burgos Juan Carlos
Electrical Engineering Department, Universidad Carlos III de Madrid, Leganés, 28911 Madrid, Spain.
Nanomaterials (Basel). 2022 Nov 22;12(23):4128. doi: 10.3390/nano12234128.
The interest in developing new fluids that can be used as dielectric liquids for transformers has driven the research on dielectric nanofluids in the last years. A number of authors have reported promising results on the electrical and thermal properties of dielectric nanofluids. Less attention has been paid to the interaction of these fluids with the cellulose materials that constitute the solid insulation of the transformers. In the present study, the dielectric strength of cellulose insulation is investigated, comparing its behavior when it is impregnated with transformer mineral oil and when it is impregnated with a dielectric nanofluid. The study includes the analysis of the AC breakdown voltage and the impulse breakdown voltage of the samples. Large improvements were observed on the AC breakdown voltages of the specimens impregnated with nanofluids, while the enhancements were lower in the case of the impulse tests. The reasons for the increase in AC breakdown voltage were investigated, considering the dielectric properties of the nanofluids used to impregnate the samples of cellulose. The analysis was completed with a finite element study that revealed the effect of the nanoparticles on the electric field distribution within the test cell, and its role in the observed enhancement.
在过去几年中，开发可作为变压器介电液体的新型流体的兴趣推动了介电纳米流体的研究。许多作者报告了介电纳米流体在电学和热学性能方面的 promising 结果。这些流体与构成变压器固体绝缘的纤维素材料之间的相互作用受到的关注较少。在本研究中，对纤维素绝缘的介电强度进行了研究，比较了其在浸渍变压器矿物油和浸渍介电纳米流体时的行为。该研究包括对样品的交流击穿电压和冲击击穿电压的分析。观察到浸渍纳米流体的试样的交流击穿电压有大幅提高，而在冲击试验中提高幅度较小。考虑到用于浸渍纤维素样品的纳米流体的介电性能，研究了交流击穿电压增加的原因。通过有限元研究完成了分析，该研究揭示了纳米颗粒对测试单元内电场分布的影响及其在观察到的增强中的作用。
