蔺家骏,高浩,潘明,李波念,顾小虎,张志立
LIN Jiajun,GAO Hao,PAN Ming,LI Bonian,GU Xiaohu,ZHANG Zhili

• 1:国网浙江省电力有限公司电力科学研究院
• 2:国网电力科学研究院有限公司(南瑞集团有限公司)
• 3:上海置信电气有限公司

摘要(Abstract)：

超薄取向硅钢具有中频损耗低、磁感应强度高等特点，在大容量中频变压器领域具有广阔的应用前景。然而，受工作电压波形和频率的影响，当前大容量中频变压器存在损耗高和发热严重等问题。为提高大容量超薄硅钢中频变压器损耗计算的准确性，降低变压器的温升，以一台1 800 kVA的中频变压器为研究对象，分析了铁心与绕组的损耗计算方法。基于理论公式和三维有限元技术，验证了铁心损耗计算的准确性。采用二维有限元技术计算变压器绕组的交、直流电阻之比，进而得到绕组的交流损耗。以计算所得的损耗为热源，建立了中频变压器有限元模型，分析了水流量、水管导热系数和环氧树脂导热系数对变压器绕组、铁心温升的影响规律，可为中频变压器的散热设计提供指导。
Ultra-thin grain-oriented silicon steel features low medium-frequency loss and high magnetic induction, giving it strong application potential in large-capacity medium-frequency transformers. However, influenced by operating voltage waveforms and frequencies, existing large-capacity medium-frequency transformers still experience high losses and severe heating. To improve the accuracy of loss analysis and reduce temperature rise, this paper investigates a 1,800 kVA medium-frequency transformer and analyzes the loss-calculation methods for both the core and the windings. The accuracy of the core-loss calculation is verified using theoretical formulas in combination with three-dimensional finite element analysis. Two-dimensional finite element analysis is employed to determine the ratio of AC to DC resistance of the windings, from which the AC winding losses are obtained. Using the calculated losses as heat sources, a finite element thermal model of the medium-frequency transformer is established. The effects of cooling-water flow rate, thermal conductivity of cooling pipes, and thermal conductivity of epoxy resin on the temperature rise of the windings and the core are then analyzed. The results provide valuable guidance for the thermal structure design of medium-frequency transformers employing ultra-thin grain-oriented silicon steel cores.

关键词(KeyWords)： 超薄硅钢;中频变压器;损耗;散热;温度场
ultra-thin grain-oriented silicon steel;medium-frequency transformer;losses;heat dissipation;temperature field

Abstract:

Keywords:

基金项目(Foundation): 国家电网有限公司科技项目（5500-202319101A-1-1-ZN）

作者(Author): 蔺家骏,高浩,潘明,李波念,顾小虎,张志立
LIN Jiajun,GAO Hao,PAN Ming,LI Bonian,GU Xiaohu,ZHANG Zhili

DOI: 10.19585/j.zjdl.202604012

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