Cooling Effect and Effect of Parameters of the Deionized Water Cooling Based ERIP Type Bushing of ±800 kV Converter Transformer
Liu Shan1, Gao Chong1, Hou Junyi2, Zhou Jianhui1, Lu Binxian3
1. State Key Laboratory of Advance Power Transmission Technology Global Energy Interconnection Research In-stitute Co. Ltd Beijing 102211 China; 2. Beijing DC T& D Engineering Technology Research Center China-EPRI Electric Power Engineering Co. Ltd Beijing 102200 China; 3. School of Electrical and Electronic Engineering North China Electric Power University Beijing 102206 China
Abstract：With the gradual increase of power grid transmission capacity, the overheating problem of large-capacity bushing in operation has become more and more serious. This paper proposes an integrated waterway cooling structure based on the method of deionized water cooling. Compared with the ±400 kV deionized water-cooling multi-pipe bushing, the ±800 kV integrated waterway cooling structure has a better cooling effect. The effects of waterway size, flow flux, and inlet water temperature on the temperature of integrated bushing based on deionized water cooling are analyzed using the simulation model. The results show that the temperature distribution of the bushing is mainly controlled by the inlet water temperature and flow flux. Suppose the flow flux of deionized water is 10 L/min, almost all the heat generated by the bushing can be taken away. The lower the inlet water temperature, the better the cooling effect. Firstly, based on the study of ±400 kV deionized water-cooling multi-pipe bushing, the ±800 kV integrated waterway cooling bushing is designed and fabricated. A three-dimensional electric-thermal-fluid field coupling model of the ±800 kV integrated waterway cooling bushing is established, and its accuracy is verified compared with the experimental temperature. The experimental and simulation results show that the ±800 kV integrated waterway cooling bushing has a simple cooling structure and strong cooling effect. Secondly, the temperature distribution of the ±800 kV integrated waterway cooling bushing is analyzed. Under the working condition of flow flux of 21 L/min, inlet water temperature of 50℃, and current of 6 736 A, the maximum temperature of the bushing is 90℃, well below the glass transition temperature of epoxy resin-impregnated paper. Therefore, the ±800 kV integrated waterway cooling bushing solves the overheating problem in operation. Finally, the effects of waterway size, flow flux, and inlet water temperature on the bushing temperature distribution are analyzed. Within the variable range of waterway size, the larger the width of the outer waterway, the stronger the cooling effect of the ±800 kV integrated waterway cooling bushing. However, in practical applications, the cooling effect of a bushing with an inner waterway width of 21 mm and an outer waterway width of 19 mm can meet the requirements. The larger the flow flux of deionized water, the stronger the cooling effect of the ±800 kV integrated waterway cooling bushing. As the flow fluxis 10 L/min, the deionized water has almost taken away all the heat generated by the current-carrying conductor. If the flow flux of deionized water continues to increase, the cooling effect has no apparent enhancement. Therefore, in practical applications, the flow flux of deionized water can be set to 10 L/min. The lower the inlet water temperature, the stronger the cooling effect of the ±800 kV integrated waterway cooling bushing. However, the inlet water temperature of 20℃ of deionized water can meet the cooling requirements to save cooling costs. The maximum temperature of the outer surface of the current-carrying conductor, in this case, is not higher than 50℃, and the maximum temperature of the inner surface of the epoxy resin paper impregnated paper is not higher than 90℃. The following conclusions can be drawn from the analysis: (1) Compared with multi-pipe deionized water-cooled bushing, the ±800 kV deionized water-cooled integrated bushing is less expensive but more effective. (2) By synthesizing the actual application requirements, cooling cost, and efficiency in practical applications, the width of the inner waterway of the casing can be set to 21 mm, the width of the outer waterway to 19 mm, the flow flux of deionized water to 10 L/min, and the inlet temperature of the deionized water to 20℃.
刘杉, 高冲, 侯俊义, 周建辉, 卢斌先. 基于去离子水冷却±800 kV换流变压器阀侧套管的冷却效果和参数的影响[J]. 电工技术学报, 2024, 39(12): 3884-3894.
Liu Shan, Gao Chong, Hou Junyi, Zhou Jianhui, Lu Binxian. Cooling Effect and Effect of Parameters of the Deionized Water Cooling Based ERIP Type Bushing of ±800 kV Converter Transformer. Transactions of China Electrotechnical Society, 2024, 39(12): 3884-3894.
[1] 谷琛, 李鹏, 何慧雯, 等. ±1100kV以上电压等级直流输电技术研究[J]. 中国电机工程学报, 2020, 40(20): 6745-6753. Gu Chen, Li Peng, He Huiwen, et al.Research on ±1100kV and above UHV DC transmission tech- nologies[J]. Proceedings of the CSEE, 2020, 40(20): 6745-6753. [2] 杜林, 张科, 冯辉, 等. 计及趋肤效应的套管载流结构损耗分析[J]. 电工技术学报, 2023, 38(17): 4746-4756. Du Lin, Zhang Ke, Feng Hui, et al.Analysis on active power loss of bushing conductor considering skin effect[J]. Transactions of China Electrotechnical Society, 2023, 38(17): 4746-4756. [3] 丁宁, 穆海宝, 梁兆杰, 等. 水分对干式套管环氧浸渍纸材料介电特性的影响[J]. 电工技术学报, 2022, 37(11): 2716-2724. Ding Ning, Mu Haibao, Liang Zhaojie, et al.Effect of moisture on the dielectric properties of epoxy resin impregnated paper for dry-type bushing[J]. Transa- ctions of China Electrotechnical Society, 2022, 37(11): 2716-2724. [4] Chen Ming, Liu Xuandong, Sun Yuhan, et al.Influence of material volume conductivity on electric field and surface charge of RIP valve-side bushing core under DC electro-thermal coupling stress[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2020, 27(1): 164-171. [5] Mikulecky A, Stih Z.Influence of temperature, moisture content and ageing on oil impregnated paper bushings insulation[J]. IEEE Transactions on Die- lectrics and Electrical Insulation, 2013, 20(4): 1421-1427. [6] Gou Ruifeng.Research on 1100-kV/5500-a ultra-high voltage thyristor valve key technology and its application[J]. IEEE Transactions on Power Elec- tronics, 2019, 34(11): 10524-10533. [7] Teng Chenyuan, Ding Yichao, Zhang Youbing, et al.Investigation on distribution of electro-thermal coupling fields influenced by HVDC bushing insulation properties[J]. Frontiers in Energy Research, 2022, 10: 1005470. [8] Yang Hongda, Chen Qingguo, Wang Xinyu, et al.Dielectric and thermal conductivity characteristics of epoxy resin-impregnated H-BN/CNF-modified insu- lating paper[J]. Polymers, 2020, 12(9): E2080. [9] 常勇, 沈志刚, 张鹏. 换流变套管末屏电压采集器铁磁谐振机理分析及抑制[J]. 电力工程技术, 2018, 37(5): 81-85. Chang Yong, Shen Zhigang, Zhang Peng.Ferro- magnetic resonance mechanism of voltage divider of the converter transformer bushing and its supper- ssion[J]. Electric Power Engineering Technology, 2018, 37(5): 81-85. [10] Wang Qingyu, Yang Xi, Tian Huidong, et al.A novel dissipating heat structure of converter transformer RIP bushings based on 3-D electromagnetic-fluid- thermal analysis[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2017, 24(3): 1938-1946. [11] Yin Pengbo, Xu Zuoming, Hu Wei, et al.Temperature homogenization technology of current carrying conductor in the valve side bushing of converter transformer based on the heat pipe theory[C]//2020 IEEE International Conference on High Voltage Engineering and Application (ICHVE), Beijing, China, 2020: 1-4. [12] 刘杉, 侯俊义, 周建辉, 等. 基于强制空气冷却的换流变阀侧套管设计及特性[J]. 高电压技术, 2022, 48(11): 4478-4487. Liu Shan, Hou Junyi, Zhou Jianhui, et al.Design and characteristics of side bushing of converter valve based on forced air cooling technology[J]. High Voltage Engineering, 2022, 48(11): 4478-4487. [13] 王青于, 杨熙, 彭宗仁, 等. 应用三维电磁-热-流耦合场分析法计算换流变压器干式套管的温度场分布[J]. 中国电机工程学报, 2016, 36(22): 6269-6275. Wang Qingyu, Yang Xi, Peng Zongren, et al.3D coupled electromagnetic-thermal-fluid method for computation of temperature field of converter trans- former RIP bushings[J]. Proceedings of the CSEE, 2016, 36(22): 6269-6275. [14] 谢更生, 史石峰, 王琪林, 等. ±800 kV换流变阀侧套管温度场仿真与大电流温升试验分析[J]. 高电压技术, 2024, 50(3): 994-1002. Xie Gengsheng, Shi Shifeng, Wang Qilin, at al. Simulation and experimental analysis of ±800 kV converter transformer valve-side bushing under high current[J]. High Voltage Engineering, 2024, 50(3): 994-1002. [15] Liu Shan, Yue Zhanbing, Hou Junyi, et al.A promising de-ionized water cooling based ERIP bushing-Ⅰ: model validation and high cooling effici- ency of the cooling method[J]. IEEE Transactions on Power Delivery, 2023, 38(2): 947-955. [16] Lu Binxian, Yue Zhanbing, Li Rui, et al.A promising de-ionized water cooling based ERIP bushing-Ⅱ: cooling mechanism and effect of parameters[J]. IEEE Transactions on Power Delivery, 2023, 38(3): 1601-1609. [17] 林牧, 刘凯, 王乃永, 等. 换流变阀侧套管数字孪生建模及热特性分析[J]. 高电压技术, 2020, 48(5): 1653-1662. Lin Mu, Liu Kai, Wang Naiyong, at al. Establishment of digital twin model of converter transformer valve-side bushing and analysis of its thermal characteristicsp[J]. High Voltage Engineering, 2020, 48(5): 1653-1662. [18] Jyothi N S, Ramu T S, Mandlik M.Temperature distribution in resin impregnated paper insulation for transformer bushings[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2010, 17(3): 931-938. [19] 史石峰, 刘杉, 谢更生, 等. 换流变阀侧套管水冷散热设计与优化分析[J]. 中国电机工程学报, 2023, 43(12): 4861-4871. Shi Shifeng, Liu Shan, Xie Gengsheng, et al.Design and optimization analysis of water cooling heat dissipation for the valve-side bushing of converter transformer[J]. Proceedings of the CSEE, 2023, 43(12): 4861-4871.
2024, Vol. 39 
