Simulation of the Bubble Dynamics and Electric Field Distribution in Flowing Transformer Oil

ZHANG Yongze; TANG Ju; PAN Cheng; LUO Xinyu

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Simulation of the Bubble Dynamics and Electric Field Distribution in Flowing Transformer Oil

更新时间：2025-12-08

- Simulation of the Bubble Dynamics and Electric Field Distribution in Flowing Transformer Oil
- Vol. 46, Issue 6, Pages: 2004-2012(2020)
- 作者机构：
  
  1. 重庆大学输配电装备及系统安全与新技术国家重点实验室
  2. 西安西电变压器有限责任公司
  3. 武汉大学电气与自动化学院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：30 June 2020，
  
  Published：2020
- 稿件说明：
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ZHANG Yongze, TANG Ju, PAN Cheng, et al. Simulation of the Bubble Dynamics and Electric Field Distribution in Flowing Transformer Oil[J]. 2020, 46(6): 2004-2012.
DOI：

ZHANG Yongze, TANG Ju, PAN Cheng, et al. Simulation of the Bubble Dynamics and Electric Field Distribution in Flowing Transformer Oil[J]. 2020, 46(6): 2004-2012. DOI：

摘要

气泡作为变压器油中的典型绝缘缺陷

极易诱发局部放电。为了弄清流动变压器油中气泡动力学行为及其对电场畸变的影响

基于有限元方法构建了气液两相流模型

仿真研究了油流速度对水平油道和垂直油道中气泡运动轨迹和变形的影响。结果表明

工频电场中气泡形状以100 Hz的频率周期性振动。在水平油道中

随着油流速的增加

气泡沿竖直方向的变形增大

由气泡导致的电场畸变减弱;在垂直油道中

随着油流速的增加

气泡沿水平方向的变形减弱

电场畸变增强。为了验证仿真模型的有效性

搭建了水平油道变压器油循环装置及气泡运动观测系统

拍摄了水平油道中气泡的运动和变形图像

发现气泡以100 Hz频率周期性振动

并提取了不同流速下气泡的形变率

实验结果与仿真结果基本相符。

Abstract

A bubble is a typical insulation defect in transformer oil

which can easily initiate partial discharge. To clarify the bubble dynamics and the effect on the electric field

a gas-liquid two-phase flow model was established based on the finite element method

and the effects of oil flow rate on the trajectory and deformation of bubbles in horizontal and vertical oil ducts were studied by simulation. The results show that the bubble shape periodically pulsates at a frequency of 100 Hz in the power-frequency electric field. In the horizontal oil duct

the deformation of bubbles in the vertical direction increases with the increase of oil flow rate

whereas the electric field distortion decreases. In the vertical oil duct

the deformation of bubbles in the horizontal direction decreases with the increase of oil flow rate

whereas the electric field distortion increases. To verify the simulation model

an oil circulation device with a horizontal oil duct and a bubble motion observation system were set up. The motion and deformation images of bubbles in the horizontal oil duct were captured

showing that the bubble shape also periodically pulsated at a frequency of 100 Hz. The deformation rates of the bubbles at different oil flow rates were extracted

which are in good agreement with the simulation results.

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