BAO Yanyan1, FENG Tingna2, ZHANG Guangdong1, LIU Kang1, MA Jianqiao2, ZHOU Xiaodong3
（1. State Grid Gansu Electric Power Research Institute， Lanzhou 730070， China；2. School of Automation and Electrical Engineering, Lanzhou Jiaotong University， Lanzhou 730070， China；3. China Railway Second Bureau Electric Co., Ltd.， Chengdu 610031， China）
Abstract： Oil immersed power transformer is the main electrical equipment in power system. Its operation reliability has an important impact on the safe operation of power system. In the process of production, installation and operation, its insulation structure may be damaged, resulting in partial discharge and even breakdown inside the transformer. In this paper, S9-M-100/10 oil immersed distribution transformer is taken as the research object, and the distribution laws of electromagnetic field and temperature field in transformer under normal operation, inter turn short circuit and inter layer short circuit are simulated and analyzed. The simulation results show that under normal conditions, the temperatures at the oil gap between the transformer core and the high and low voltage windings and the middle position of the high-voltage winding are high. When there are inter turn and inter layer short circuit faults, the electromagnetic loss of the fault part of the transformer increases, and the temperature rises suddenly. The influence of the two faults on the internal temperature field of the transformer is different, and the influence of the inter turn short circuit fault on the temperature nearby is obvious. The analysis results can provide reference for the thermal fault interpretation and fault classification of transformer.
Key words： oil immersed power transformer; finite element method; electromagnetic field; short circuit fault; temperature field
References
［1］Zhang Y Z, Tang J, Pan C, et al. Simulation of bubble dynamics and electric field distribution in flow transformer oil. High Voltage Technology, 2020, 46(6): 2004-2012.
［2］Gao M, Zhang Q G, Ding Y Q, et al. Thermally induced bubble formation characteristics of oil-impregnated paper insulation. High Voltage Technology, 2018, 44(11): 3634-3640.
［3］Pan C, Chen X, Cai G W. Research on the electromagnetic characteristics of the short-circuit in the middle of the single-phase transformer. Journal of Northeast Dianli University, 2019, 39(5): 34-40.
［4］Pan C, Shi W X, Meng T. Research on electromagnetic characteristics of single-phase transformer inter-turn short circuit. High Voltage Technology, 2020, 46(5): 1839-1856.
［5］Xie Y Q, Li L, Song Y W, et al. Multi-physics coupling calculation method of oil-immersed power transformer winding temperature rise. Chinese Journal of Electrical Engineering, 2016, 36(21): 5957-5965.
［6］Liu G, Jin Y J, Ma Y Q, et al. Numerical analysis of fluid field and temperature field of oil-immersed transformer. Transformer, 2017, 54(5): 22-26.
［7］Wang Q Y, Yang X, Peng Z R, et al. Application of three-dimensional electromagnetic-thermal-flow coupling field analysis method to calculate the temperature field distribution of converter transformer dry bushing. Chinese Journal of Electrical Engineering, 2016, 36(22): 6269-6275.
［8］Li H C, Zhang Z J, Shao L, et al. Analysis of winding temperature distribution using multi-point optical fiber temperature measurement device combined with simulation calculation. Transformer, 2017, 54(2): 41-44.
［9］Wang Y Q, Ma L, Lu F C, et al. Three-dimensional temperature field calculation of oil-immersed transformer based on the combination of finite difference and finite volume method. High Voltage Technology, 2014, 40(10): 3179-3185.
［10］Zhang X. Research on temperature field calculation of large transformer based on multiphysics coupling.Baoding: North China Electric Power University, 2019.
［11］Liao C B, Ruan J J, Lu H D, et al. Research on the two-dimensional electromagnetic-fluid-temperature field coupling analysis method of oil-immersed transformers. Science Technology and Engineering, 2014, 14(36): 67-71.
［12］Liao C B, Ruan J J, Liu C, et al. Three-dimensional electromagnetic-fluid-temperature field coupling analysis method for oil-immersed transformers. Electric Power Automation Equipment, 2015, 35(9): 150-155.
［13］Taheri S, Vahedi A, Gholami A, et al. Estimation ofhot spot temperature in distribution transformer considering core design using FEM. In: Proceedings of International Power & Energy Conference, IEEE, 2008.
［14］Mechkov E, Tzeneva R, Mateev V, et al. Thermal analysis using 3D FEM model of oil-immersed distribution transformer.In: Proceedings of International Symposium on Electrical Apparatus & Technologies, IEEE, 2016.
［15］Liu H J, Zhang D D, Li W, et al. Finite element analysis of the winding temperature field of large oil-immersed transformers. High Voltage Apparatus, 2019, 55(12): 83-89.
［16］Wu W G, Du Z B, Liu G, et al. Simulation and verification of the winding temperature field of a large oil-immersed transformer. Journal of North China Electric Power University (Natural Science Edition), 2020, 47(6): 68-74.
［17］He Q, Ruan L, Luo W, et al. Temperature field simulation calculation and field temperature rise test analysis of vegetable insulating oil directly replacing mineral insulating oil in distribution transformers. High Voltage Apparatus, 2019, 55(9): 200-207.
［18］Jiang H Z, Wei B G, Wen J, et al. Simulation and analysis of three-dimensional temperature field and flow field of split oil-immersed self-cooling transformer. High Voltage Electrical Apparatus, 2021, 57(2): 63-69.
［19］Zhuang S F. Simulation analysis and application research of Maxwell-based oil-immersed power transformer physical field. Fuzhou: Fuzhou University, 2011.
［20］Editorial Department of Transformer. Calculation method for power transformer design. Shenyang: Liaoning science and Technology Press, 1988.
［21］Zhu X D. Design of online monitoring system for transformer turn-to-turn short-circuit faults.Jinan: Shandong University, 2017.
局部热源对电力变压器内部温度分布的影响分析
包艳艳1， 冯婷娜2， 张广东1， 刘 康1， 马建桥2， 周小东3
（1. 国家电网甘肃电力科学研究院， 甘肃 兰州 730070；2. 兰州交通大学 自动化与电气工程学院， 甘肃 兰州 730070；3. 中铁二局电务有限公司， 四川 成都 610031）
摘 要: 油浸式电力变压器是电力系统的主要电气设备， 其运行可靠性对电力系统的安全运行有重要的影响， 在生产、 安装及运行等过程中可能会破坏其绝缘结构， 导致变压器内部产生局部放电现象甚至击穿。 本文以S9-M-100/10型号的油浸式配电变压器为研究对象， 仿真分析变压器正常运行、 匝间短路及层间短路三种状态下变压器内部电磁场及温度场的分布规律。 仿真结果表明， 正常状态下变压器铁芯、 高低压绕组之间的油隙撑条帘处及高压绕组中间位置的温度较高； 存在匝间及层间短路故障时， 变压器故障部位的电磁损耗加剧， 温度骤升； 两种故障对变压器内部温度场的影响不同， 且匝间短路故障对其附近温度的影响较明显。 分析结果可为解释变压器热性故障及故障分类提供参考。
关键词: 油浸式电力变压器； 有限元法； 电磁场； 短路故障； 温度场
引用格式： BAO Yanyan, FENG Tingna, ZHANG Guangdong, et al. Influence analysis of local heat source on internal temperature distribution of power transformer. Journal of Measurement Science and Instrumentation, 2021, 12（2）： 218-225. DOI： 10.3969／j.issn.1674-8042.2021.02.011
[full text view]
