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  

Study on Low-Frequency Heating and Drying Method of UHVAC Transformer Based on Temperature Feedback of Winding Hot Spots

作　　者：杜志叶[1] 肖湃 郝兆扬 段辞涵 谢齐家 Du Zhiye;Xiao Pai;Hao Zhaoyang;Duan Cihan;Xie Qijia(School of Electrical Engineering and Automation Wuhan University, Wuhan 430072 China;Southern Power Grid Guangzhou Power Supply Company, Guangzhou 510000 China;State Grid Hubei Electric Power Research Institute ,Wuhan 430077 China)

机构地区：[1]武汉大学电气与自动化学院,武汉430072 [2]南网广东电网有限责任公司广州供电局,广州510000 [3]国网湖北省电力有限公司电力科学研究院,武汉430077

出　　处：《电工技术学报》2022年第15期3888-3896,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(51977152)。

摘　　要：特高压变压器现场组装完成后,经加热干燥后的油温会影响变压器绝缘安全。针对传统热油循环法在寒冷地区现场加热特高压变压器效率偏低的问题,该文建立典型特高压交流变压器绕组流体-温度耦合数值模型,仿真分析1 000kV特高压交流变压器热油循环加热及低频加热的温升规律,提出一种基于低频加热绕组热点温度反馈结果确定散热器油泵开启合理时间的变压器加热干燥方法,通过温升试验验证仿真模型与算法的可行性。结果表明低频加热配合散热器热油循环技术在7h时刻开启散热器油泵可以大幅缩短加热时间,提升加热效率。研究结果为寒冷地区特高压交流变压器的加热干燥提供了新的解决方案。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 fluidtemperature 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.

关 键 词：特高压交流变压器 热油循环 低频加热 温度场 

分 类 号：TM411[电气工程—电器]