Insulating properties and charge characteristics of natural ester fluid modified by TiO 2 semiconductive nanoparticles

作者：Yuxiang Zhong, Yuzhen Lv, Chengrong Li, Yuefan Du, Mutian Chen, Shengnan Zhang, You Zhou, Long Chen · 发表于：IEEE Transactions on Dielectrics and Electrical Insulation · 年份：2013 · DOI：10.1109/tdei.2013.6451351 · 被引用次数：134 · 研究领域：High voltage insulation and dielectric phenomena、Power Transformer Diagnostics and Insulation、Electrohydrodynamics and Fluid Dynamics

In order to improve dielectric performance of natural esters, TiO2semiconductive nanoparticles were added to obtain an ester-based nanofluid. AC, lightning impulse voltage and partial discharge tests were applied to the natural ester and the ester-based nanofluid to check their dielectric performances. It was found that TiO2nanoparticles can not only enhance AC breakdown voltage of the ester based nanofluid by a factor of 1.3 but also improve the partial discharge properties of the ester based nanofluid compared to that of the natural ester. Pulse electroacoustic (PEA) and thermally stimulated current (TSC) techniques were applied to investigate charge transport and trap characteristic in natural ester and ester-based nanofluid. It reveals that TiO2nanoparticles can accelerate the charge dissipation rate and uniform the electric field and increase the shallow trap density in the ester-based nanofluid. It is proposed that electron trapping and de-trapping processes in the shallow traps could be one of the main charge transport processes in the ester based nanofluid.