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

doi:10.19595/j.cnki.1000-6753.tces.230509

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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℃.

Key words： De-ionized water cooling electro-thermal-fluid field coupling cooling effect parameter scanning high voltage bushing

Received: 20 April 2023

PACS:

TM216

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	Liu Shan
	Gao Chong
	Hou Junyi
	Zhou Jianhui
	Lu Binxian

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Liu Shan,Gao Chong,Hou Junyi等. Cooling Effect and Effect of Parameters of the Deionized Water Cooling Based ERIP Type Bushing of ±800 kV Converter Transformer[J]. Transactions of China Electrotechnical Society, 2024, 39(12): 3884-3894.

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