Numerical study on temperature rise and mechanical properties of winding in oil-immersed transformer

被引：37

作者：

Jia, Xiaoyu ^{[1
]}

Lin, Mei ^{[1
]}

Su, Shiwei ^{[2
]}

Wang, Qiuwang ^{[2
]}

Yang, Jian ^{[2
]}

机构：

[1] Xi An Jiao Tong Univ, Sch Energy & Power Engn, Dept Fluid Machinery, Xian 710049, Peoples R China

[2] Xi An Jiao Tong Univ, MOE Key Lab Thermofluid Sci & Engn, Xian 710049, Peoples R China

来源：

ENERGY | 2022年 / 239卷

基金：

中国国家自然科学基金;

关键词：

Oil-immersed transformer; Multi-physics coupling; Winding temperature rise; Electromagnetic force; Stress and deformation of coil; POWER TRANSFORMER; THERMAL-ANALYSIS; ENVIRONMENT; INRUSH;

D O I：

10.1016/j.energy.2021.121788

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In the present paper, the electromagnetic-fluid-thermal-mechanical stress coupling process in an oil immersed transformer is numerical studied with finite element method. The relationship between electromagnetic force and flux leakage, interaction of losses, temperature and oil flow, and the influence of electromagnetic force and temperature rise on mechanical characteristics of coil are carefully analyzed. Firstly, the leakage flux is mainly generated at the ends of coil and core corner end. The electromagnetic force of B-Phase low voltage coil is the highest due to the leakage flux superimposition caused by A-Phase and C-Phase coils and higher current on B-Phase low voltage coil itself. Secondly, the interaction between losses, temperature and oil flow is remarkable. Compared with the results as heat source is constant, the loss density of high and low voltage coil increased by 18.18% and 14.87%, respectively, and the hot spot temperature increased by 7.06 K. Finally, it is revealed that the coil deformation is mainly caused by thermal load, and little affected by electromagnetic force. The frequency of stress is twice as high as that of energized current. The stress at both ends of the coil is the highest and it would lead to fatigue failures. (c) 2021 Elsevier Ltd. All rights reserved.

引用

页数：15

共 36 条

[1] Numerical investigation for transient electromagnetic force computation of power transformer during short-circuit condition [J].

Ahn, Hyun-Mo ;

Kim, Seong-Yun ;

Kim, Joong-Kyoung ;

Oh, Yeon-Ho ;

Hahn, Sung-Chin .

INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS, 2016, 52 (3-4) :1141-1149

[2]

[Anonymous], 2016, COMS MULT

[3] Estimation of power losses in a high-frequency planar transformer using a thermal camera [J].

Barlik, Roman ;

Nowak, Mieczyslaw ;

Grzejszczak, Piotr ;

Zdanowski, Mariusz .

ARCHIVES OF ELECTRICAL ENGINEERING, 2016, 65 (03) :613-627

[4] Thermal response and failure mode evaluation of a dry-type transformer [J].

Blanco Alonso, Pelayo E. ;

Meana-Fernandez, Andres ;

Fernandez Oro, Jesus M. .

APPLIED THERMAL ENGINEERING, 2017, 120 :763-771

[5] Post-mortem estimation of temperature distribution on a power transformer: Physicochemical and mechanical approaches [J].

Carcedo, Juan ;

Fernandez, Inmaculada ;

Ortiz, Alfredo ;

Carrascal, Isidro A. ;

Delgado, Fernando ;

Ortiz, Felix ;

Arroyo, Alberto .

APPLIED THERMAL ENGINEERING, 2014, 70 (01) :935-943

[6] The role of load harmonics in audible noise of electrical transformers [J].

Ertl, Michael ;

Voss, Stephan .

JOURNAL OF SOUND AND VIBRATION, 2014, 333 (08) :2253-2270

[7] Analysis of electromagnetic-mechanical stresses on the winding of a transformer under inrush currents conditions [J].

Fonseca, Wellington da S. ;

Lima, Diorge de S. ;

Lima, Adry K. F. ;

Soeiro, Newton S. ;

Nunes, Marcus V. A. .

INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS, 2016, 50 (04) :511-524

[8] Numerical modelling of natural convection of oil inside distribution transformers [J].

Gastelurrutia, Jon ;

Carlos Ramos, Juan ;

Larraona, Gorka S. ;

Rivas, Alejandro ;

Izagirre, Josu ;

del Rio, Luis .

APPLIED THERMAL ENGINEERING, 2011, 31 (04) :493-505

[9] Electromechanical stress in transformers caused by inrush and short circuit currents [J].

Guimaraes, Ronaldo ;

Delaiba, Antonio C. ;

Rosentino, Arnaldo J. P., Jr. ;

Saraiva, Elise ;

de Oliveira, Jose C. .

JOURNAL OF THE BRAZILIAN SOCIETY OF MECHANICAL SCIENCES AND ENGINEERING, 2015, 37 (01) :243-253

[10] Optimal distribution transformer sizing in a harmonic involved load environment via dynamic programming technique [J].

Hajipour, Ehsan ;

Mohiti, Maryam ;

Farzin, Nima ;

Vakilian, Mehdi .

ENERGY, 2017, 120 :92-105

← 1 2 3 4 →