Microscopic Model of Breakdown and Conduction in TiO<sub>2</sub> Nanoparticles Modified Transformer Oil

WANG Lei; NIU Mingkang; LI Chao; Lü Yuzhen; HUANG Meng; LI Chengrong

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Microscopic Model of Breakdown and Conduction in TiO₂ Nanoparticles Modified Transformer Oil

更新时间：2025-12-08

- Microscopic Model of Breakdown and Conduction in TiO₂ Nanoparticles Modified Transformer Oil
- Vol. 45, Issue 10, Pages: 3350-3356(2019)
- 作者机构：
  
  1. 华北电力大学新能源电力系统国家重点实验室
  2. 内蒙古电力科学研究院
  3. 上海明华电力技术工程有限公司
  4. 华北电力大学能源动力与机械工程学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 October 2019，
  
  Published：2019
- 稿件说明：
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WANG Lei, NIU Mingkang, LI Chao, et al. Microscopic Model of Breakdown and Conduction in TiO₂ Nanoparticles Modified Transformer Oil[J]. 2019, 45(10): 3350-3356.
DOI：

WANG Lei, NIU Mingkang, LI Chao, et al. Microscopic Model of Breakdown and Conduction in TiO₂ Nanoparticles Modified Transformer Oil[J]. 2019, 45(10): 3350-3356. DOI：

摘要

变压器油中水分的存在将导致变压器油绝缘性能降低

而变压器油中添加TiO

纳米粒子可以束缚变压器油中的水分

减轻水分对变压器油的不利影响。为此

测试了40×10-6水分质量分数下变压器油和3种TiO

纳米变压器油的工频击穿电压和电阻率。结果表明

10 nm球状纳米变压器油的工频击穿电压提高了111.9%

改性效果最为显著;5 nm球状纳米变压器油和5 nm棒状纳米变压器油分别提高了100.6%、97.9%。而3种TiO

纳米变压器油的电阻率相比于纯油却要小3个数量级。这并不符合电气绝缘材料电阻率越大

击穿电压也越高的现象。因此

利用Material Studio模拟了水分子与3种纳米粒子的结合方式、分布状态

基于液固界面Gouy-Chapman-Stern模型提出了TiO

纳米变压器油中改进Stern双电层微观模型

并指出纳米颗粒表面吸附油中水分子和负电荷形成水膜

减少电子碰撞油中水分子产生贯通气体小桥通道的概率。利用此模型揭示了纳米粒子尺寸与纳米粒子形貌对变压器油击穿和电导特性的影响机理。

Abstract

The existence of moisture will lead to lower insulation performance of transformer oil. TiO2 nanoparticles can bind the moisture in transformer oil

which reduces the adverse effects of the moisture. The power frequency breakdown voltage and resistivity of transformer oil and nanofluids under the same moisture content of 40 ppm were tested. The results show that the power frequency breakdown voltage of 10 nm spherical nanofluid is increased by 111.9%

and the modified effect is the most significant. And the breakdown voltages of 5 nm spherical nanofluid and 5 nm rod-like nanofluid are increased by 100.6% and 97.9%

respectively. However

the resistivity of the three kinds of nanofluids is three orders of magnitude smaller than pure oil. But this does not conform to such a phenomenon of electrical insulation as the greater the resistivity is

the higher the breakdown voltage will be. Using the software of Material Studio

the combination mode and distribution state of water molecules with three kinds of nanoparticles are simulated. Accordingly

the improved Stern double layer microscopic model based on the liquid solid interface Gouy-Chapman-Stern model in TiO2 nanofluids is proposed. The surface of the nanoparticles will adsorb water molecules and negative charges in the oil

and eventually form a water film

reducing the probability that a small gas bridge channel produced by electronic collision of water molecules. Moreover

the influence mechanism of size and morphology of nanoparticles on breakdown and conductance characteristics in nanofluids is revealed based on this model.

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Microscopic Model of Breakdown and Conduction in TiO2 Nanoparticles Modified Transformer Oil

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摘要

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关键词

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Microscopic Model of Breakdown and Conduction in TiO₂ Nanoparticles Modified Transformer Oil