基于修正的Havriliak-Negami模型的SiO_2纳米改性变压器油宽频介电弛豫特性  

The Broadband Dielectric Relaxation Properties of the Transformer Oil Based on SiO_2 Nanoparticles Using Modified Havriliak-Negami Model

作　　者：温福新[1,2] 董明[1] 任明[1] Christof Sumereder Michael Muhr 

机构地区：[1]电力设备电气绝缘国家重点实验室(西安交通大学),西安710049 [2]中国大唐西北电力试验研究所,西安710077 [3]Institute of High Voltage Engineering and System Management Graz University of Technology

出　　处：《电工技术学报》2016年第7期166-172,共7页Transactions of China Electrotechnical Society

基　　金：中央高校基本科研业务费专项资金;电力设备国家重点实验室创新基金(EIPE13311);中国博士后基金(2014M560777);陕西省科学技术研究发展计划(2013GY2-08)资助项目

摘　　要：为了掌握纳米改性变压器油介电性能,探索纳米改性内在机理,对Si O2纳米改性变压器油介质损耗特性进行了试验研究。首先在室温条件下分别对纯变压器油和Si O2纳米改性变压器油的宽频介电谱进行测试,然后引入修正的Havriliak-Negami模型方程对实测结果进行拟合,并从该模型中提取了相应的介电参数用于分析纳米油介电性能的变化规律。试验结果表明,与纯变压器油介电谱相比,Si O2纳米油介电谱的低频段电导损耗降低了,而中高频段极化损耗增加了。经分析与讨论,可认为Si O2纳米颗粒添加到变压器油中,纳米颗粒与油分子形成微观双电层结构,其增加了纳米流体中载流子跃迁势垒,致使纳米油宏观介电性能发生一定程度改变。In order to understand the dielectric properties of the transformer oil based on nanofluids and explore its internal modification mechanism,this paper investigates the dielectric loss characteristics of the transformer oil based on SiO_2 nanoparticles. Firstly the broadband dielectric spectroscopy of the pure transformer oil and the oil based on SiO_2 nanoparticles are measured at room temperature. The measured results are fitted by the modified Havriliak-Negami model function. Then the model＇s parameters are extracted and analyzed. The results indicate that,comparing with pure oil ＇s dielectric spectroscopy,the conduction loss in low frequency domain of SiO_2nano-modified oil decreases,while its polarization loss in higher frequency domain increases.Through analysis and discussion,it could be inferred that the microscopic electric double layer will be formed in the interfaces of nanoparticles and oil molecules after the incorporation of the SiO_2 nanoparticles into the transformer oil.This microscopic structure enhances the transition barrier of the charge carriers in nanofluids,resulting in the change of macroscopic dielectric properties of the transformer oil based on nanofluids to a certain degree.

关 键 词：纳米改性变压器油 宽频介电谱 界面极化 介电响应 

分 类 号：TM214[一般工业技术—材料科学与工程]