温度对纳米改性变压器油宽频介电谱特性的影响

Temperature Influence on the Frequency Domain Spectroscopy Properties of Transformer oil Based on Nanoparticles

纳米改性变压器油在绝缘性能和传热性能的优势已经得到了国内外学者的广泛认可,但现阶段大多数学者的研究多集中于纳米改性变压器油的宏观特性上,且对于其改性机理尚不明确,通过研究纳米油微观结构与电导、极化之间的相关性,可以为探索纳米油的改性机理以及推广实际应用提供一定的理论参考。该文主要研究了温度对纳米改性变压器油频域介电谱的影响,在10–2~106Hz频率范围内对纳米油介电谱特性进行了分析讨论。随着温度的增加,纳米油的直流电导率呈指数型增加;而在介电谱的中高频段,出现了一个明显的极化峰,随着温度的增加,极化峰峰值逐渐减小且向高频方向移动,Schwarz双电层极化理论可用来解释这一现象。

It has been widely recognized that the transformer oil based-nanofluids has better performance in heat transfer and insulating properties compared with pure oil, but most researchers have only focused on the macroscopic property＇s characteristics, and it is not clear the modification mechanism of oil based-nanofluids. It is necessary to study the correlation between the microstructure of oil based on nanoparticles and its conduction and polarization properties, which can lay a theoretical foundation for explorating the modification mechanism of oil based-nanofluids and promote its practical applications. The purpose of this paper is to explore the influence of temperature on the frequency domain spectroscopy of transformer oil based on nanoparticles in the frequency domain（10-2 Hz^106 Hz） and analyze the imaginary part of the complex dielectric permittivity. As the temperature increased, the DC conductivity of nano-modified oil increased exponentially; there existed a clear polarization peak in the high frequency domain, with increasing the temperature, the value of the polarization peak decreased and moved to higher frequencies, the Schwarz＇s electrical double layer theory could be used to explain this phenomenon.