Effect of TiO2 Nanoparticles on Charge Transportation in Mineral Oil and Natural Ester Based Nanofluid  

作　　者：DU Yuefan LI Chengrong LU Yuzhen ZHONG Yuxiang CHEN Mutian ZHOU You 

机构地区：[1]Beijing Key Laboratory of High Voltage and Electromagnetic Compatibility, School of Electric and Electronic Engineering, North China Electric Power University, Beijing 102206, China [2]School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing 102206, China [3]State Key Laboratory of Alternate Electric Power System with Renewable Energy Sources, North China Electric Power University, Beijing 102206, China

出　　处：《高电压技术》2013年第8期1941-1946,共6页High Voltage Engineering

基　　金：Project supported by National Natural Science Foundation of China （51077050）, Chinese Universities Scientific Fund.

摘　　要：TiO2 semiconductive nanoparticles are added into mineral and ester based transformer oil to form semiconductive nanofluids (SNFs) with the aim of enhancing the oil’s insulating performance. Charge accumulation and decay characteristics of both pure oils and SNFs are measured by pulse electroacoustic (PEA) technique. The result reveals that compared with pure oil, SNFs have more uniform in- ternal electric fields with voltage applied and higher charge decay rate after removing the applied voltage. This is caused by the increase of shallow trap density in SNFs, due to the test results of thermally stimulated current (TSC). It is proposed that the electron trapping and de-trapping processes in shallow traps could be the main charge transport processes in the nanofluid transformer oil.TiO2 semiconductive nanoparticles are added into mineral and ester based transformer oil to form semiconductive nanofluids （SNFs） with the aim of enhancing the oil＇s insulating performance. Charge accumulation and decay characteristics of both pure oils and SNFs are measured by pulse electroacoustic （PEA） technique. The result reveals that compared with pure oil, SNFs have more uniform in- ternal electric fields with voltage applied and higher charge decay rate after removing the applied voltage. This is caused by the increase of shallow trap density in SNFs, due to the test results of thermally stimulated current （TSC）. It is proposed that the electron trapping and de-trapping processes in shallow traps could be the main charge transport processes in the nanofluid transformer oil.

关 键 词：二氧化钛纳米粒子 电荷积累 纳米流体 矿物油 酯基 半导体纳米粒子 天然 运输 

分 类 号：TM914.41[电气工程—电力电子与电力传动] TL818.4[核科学技术—核技术及应用]