Study on Low-Frequency Heating and Drying Method of UHVAC Transformer Based on Temperature Feedback of Winding Hot Spots
Du Zhiye1, Xiao Pai1, Hao Zhaoyang1, Duan Cihan2, Xie Qijia3
1. School of Electrical Engineering and Automation Wuhan University Wuhan 430072 China; 2. Southern Power Grid Guangzhou Power Supply Company Guangzhou 510000 China; 3. State Grid Hubei Electric Power Research Institute Wuhan 430077 China
Abstract：The oil temperature of the UHV transformer after being heated and dried on site will affect the insulation safety of the transformer. To solve the problem of low efficiency of traditional hot oil circulation method in heating UHV transformer in low temperature area, in this paper, the fluid-temperature coupling numerical model of typical UHVAC transformer was established and the temperature rise law of 1 000kV UHVAC transformer hot oil circulating heating and low frequency heating was analyzed. The transformer heating and drying method based on low frequency heating winding hot spot temperature feedback to determine the reasonable opening time of radiator oil pump was proposed. The feasibility of the simulation model and algorithm was verified through the temperature rise test. The results show that the heating time can be reduced greatly by low frequency heating combined with radiator hot oil circulation technology at the time of 7h with opening the radiator oil pump and the heating efficiency can be increased. The results can provide a new solution for heating and drying of UHVAC transformer in low-temperature area.
杜志叶, 肖湃, 郝兆扬, 段辞涵, 谢齐家. 基于绕组热点温度反馈的特高压交流变压器低频加热干燥方法研究[J]. 电工技术学报, 2022, 37(15): 3888-3896.
Du Zhiye, Xiao Pai, Hao Zhaoyang, Duan Cihan, Xie Qijia. Study on Low-Frequency Heating and Drying Method of UHVAC Transformer Based on Temperature Feedback of Winding Hot Spots. Transactions of China Electrotechnical Society, 2022, 37(15): 3888-3896.
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