Comparative analysis of multi-physical fields of vegetable and mineral insulating oil power transformer

Abstract

This article calculates and studies the oil flow distribution, temperature distribution and electric field distribution of vegetable and mineral Insulating oil in the low-voltage winding of the transformer with finite element method (FEM). The results show that the maximum flow rates of vegetable Insulating oil and mineral oil are located on the side wall of low-voltage winding at 0.1, 0.3 and 0.6 m/s inlet velocities, and the maximum flow rate of mineral oil is higher. In addition, the increase of inlet flow rate will also cause the temperature inside the low voltage (LV) winding to drop. Due to the low viscosity of mineral oil, its heat transfer efficiency is higher. In addition, at the same flow rate, the pressure of mineral oil in the low-voltage winding is smaller, which is also due to the low viscosity and strong fluidity of mineral oil.

Keywords:

• Multi-physical fields
• power transformer
• vegetable oil
• mineral oil

Reviewing editor:

• Ai Qingsong, Wuhan University of Technology, CHINA

Subjects:

• Technology
• Engineering & Technology
• Electrical & Electronic Engineering
• Electronics
• Mechanical Engineering
• Materials Science

Acknowledgments

The project’s title is High Voltage Large Capacity Natural Ester Vegetable Oil Transformer Key Technology Research.

Authorship contribution statement

Suning Liang and Xianjun Shao: Conceptualization, methodology, data analysis, article writing. Zhi Yang: Methodology, data analysis. Lingfeng Jin: Conceptualization, article reviewing. Qiang Wang and Zhengyong Huang: Conceptualization, supervision of the project and article writing and reviewing.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This work was supported by Science and Technology Project of State Grid Zhejiang Electric Power Co., Ltd., grant number 5211DS22000H.

Notes on contributors

Suning Liang

Suning Liang was born in Jiangsu province, China, in 1991. He received the Ph.D. degree in electrical engineering in 2021 from Chongqing university, Chongqing, China. He is currently an electrical engineer in Electric Power Research Institute of Zhejiang Electric Power Co., Ltd. His research field mainly includes pre-breakdown and breakdown phenomena in liquids, environment-friendly insulation materials, online monitoring and fault diagnosis of HV power equipment.