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Research on improving thermal conductivity of transformer anti-corrosive coating |
MO Juan, XU Jin, FAN Baozhen, LIU Rui |
China Electric Power Research Institute, Beijing 100192, China |
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Abstract: This study aims to develop a new type of environmentally friendly high thermal conductivity anti-corrosive coating for transformers. Graphene, carbon nanotube, carbon nano-horn and ultrafine graphite powder mixture are used to modify the thermal conductivity of the coating on the transformer surface. The thermal conductivity and microstructure of traditional solvent-based coatings, water-based epoxy zinc-rich coatings, and modified high thermal conductivity coatings are analyzed. Results show that the modified high thermal conductivity coating has the smallest thermal resistance (2.51℃/W) and the highest thermal conductivity (1.3460 W/(m·K)), indicating that its thermal conductivity is significantly better than those of the other two traditional coatings. This enhancement is mainly related to the optimization of the type of thermal conductivity and the improvement of coating density. After adding high thermal conductivity filler to the waterborne epoxy zinc-rich coating, a ballistic-diffusion scheme of heat transfer is formed. On the other hand, the added high thermal conductivity material fills the pores and cracks in the coating, which greatly improves the density of the coating and builds a heat transfer channel between transformer metal and external environment. The transformer temperature rise simulation experiment shows that the high thermal conductivity coating can reduce the top layer temperature rise of transformer oil by 1.67 K.
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Received: 16 July 2021
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[1] 栾福明. 智能电网趋势下北京N公司发展战略研究[D]. 北京:华北电力大学(北京), 2016.
[2] 刘腾跃. 纳米SiO2改性变压器油的热物性研究[D]. 合肥:中国科学技术大学, 2015.
[3] 郭亚丽. 电力变压器油纸绝缘老化分析及其机理研究[D]. 重庆:重庆大学, 2007.
[4] Redline S. IEEE guide for loading mineral-oil-immersed transformers[R]. New York:IEEE, 2012.
[5] 王亮亮, 刘方. 高导热聚丙烯复合材料导热性能的研究[J]. 广东塑料, 2005(8):49-52.
[6] 井新利, 李立匣. 石墨-环氧树脂导热复合材料的研究[J]. 西安交通大学学报, 2000, 34(10):106-107.
[7] 严栋. 导电/导热纳米复合材料的制备与性能研究[D]. 北京:北京化工大学, 2013.
[8] Sayata G, Kent A W, Donavon M D, et al. Incorporation of multi-walled carbon nanotubes into high temperature resin using dry mixing techniques[J]. Composites Part A, 2005, 37(3):465-475.
[9] Yin Yu, Shao Junpeng, Zhang Lin, et al. Study on heat conduction and adsorption/desorption characteristic of MIL-101/few layer graphene composite[J]. Journal of Porous Materials, 2021(28):1197-1213.
[10] 翟德怀. 基于Hot Disk的薄板材料导热系数测量方法的研究[D]. 广州:华南理工大学, 2015.
[11] 徐慧, 杨杰. 瞬态热带法和瞬态平面法测量材料热传导系数[J]. 测控技术, 2004(11):71-73.
[12] 侯成刚, 张广明, 赵明涛, 等. 用红外热成像技术精确测定物体发射率[J]. 红外与毫米波学报, 1997, 16(3):193-198.
[13] 袁世平, 姜培学. 固态金属中声子热传递的分子动力学模拟研究[J]. 工程热物理学报, 2005, 26(S1):175-178.
[14] 西格尔, 豪厄尔. 热辐射传热[M]. 北京:科学出版社, 1990.
[15] 郗恒东, 孙超, 夏克青. 湍流热对流中的动力学和传热研究[J]. 物理, 2006, 35(4):265-268.
[16] 张志伟, 张志慧. 10 kV配电变压器发热原因分析[J]. 农村电工, 2019, 27(10):42.
[17] 李晓宁. 电力变压器发热分析[J]. 中国科技投资, 2017, 27:80-84.
[18] Antonio Campo. Statistical heat transfer from uniform annular fins with high thermal conductivity coating[J]. Journal of Thermophysics & Heat Transfer, 2001, 15(2):242-245.
[19] 张玉平. 脉冲电沉积技术制备硅烷/氧化石墨烯复合涂层及其电化学性能研究[D]. 青岛:中国海洋大学, 2014.
[20] 薛杨. 导热绝缘硅橡胶复合材料的结构设计及性能研究[D]. 北京:中国科学院大学, 2019.
[21] Li J, Liang J, Liu Y M. High-thermal conductive coating used on metal heat exchanger[J]. Chinese Journal of Chemical Engineering, 2014, 22(5):596-601.
[22] Andrey M A, Sergey V K, Fedor M S. High thermal conductivity composite of diamond particles with tungsten coating in a copper matrix for heat sink application[J]. Applied Thermal Engineering, 2012, 48(1):72-80. |
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