Surface Modification of Nanoparticle and Its Charging Dynamics During Streamer Discharge in Transformer Oil
Surface Modification of Nanoparticle and Its Charging Dynamics During Streamer Discharge in Transformer Oil
复制标题
变压器油中纳米颗粒的表面改性及其流光放电充电动力学
DOI：
10.1166/nnl.2014.1775
复制
发表时间：
2014-05
期刊：
影响因子：
--
通讯作者：
Fei Yu
中科院分区：
文献类型：
--
作者：
Wenxia Sima;Jian Shi;Qing Yang;Fei Yu
Nanofluids are becoming alternatives of traditional transformer oil for their excellent heat dissipation and electrical properties. The preparation of nanofluid is introduced to achieve the best stability and dispersion. The mechanisms of trapping electrons by conductive and dielectric nanoparticles are explained. The surface charge distributions, the saturation charges on conductive and dielectric nanoparticles and the charging process are obtained. The insulation performance tests and ionization models of transformer oil and oil-based nanofluids with conductive Fe3O4, semi-conductive TiO2, and dielectric Al2O3 nanoparticles are carried out. Based on the effect mechanism of nanoparticles, the electric field dependent molecular ionization model of streamer development in transformer oil is constructed. The continuum equations of electrons, positive and negative ions, and negatively charged naonparticles are coupled with Poisson equation. The nanoparticle with larger conductivity or permittivity has more saturation charges on its interface, contributes greater effects to the streamer development and further improves the breakdown strength of oil-based nanofluid.
