基于多物理场耦合的高压电抗器温度场仿真与分析

为研究干式空心电抗器整体及包封内部各层绕组温度分布特性,根据电磁热流多物理场耦合方法,建立了干式空心电抗器电磁-流体-温度三维温升计算模型。首先,基于场-路耦合的电磁学理论,采用有限元法求取电抗器各层电流,计算各层绕组损耗。然后,基于流体-温度耦合的传热理论,以各层绕组损耗为热源,采用有限体积法求解电抗器温度分布。最后,采用稳态热学分析法验证了结果的准确性。研究结果表明:电抗器温度分布呈现上区域大于下区域、中间包封大于两侧包封的变化趋势,各层绕组温升热点位于电抗器轴向高度约85%到90%。研究结果为电抗器结构优化、温度的在线监测提供了理论依据。

Simulation and analysis of temperature field of high voltage reactor based on multi physical field coupling

In order to study the temperature distribution characteristics of the whole and inner layer winding of dry-type air-core reactor, a three dimensional temperature rise calculation model of electromagnetic-fluid-temperature of dry-type air-core reactor is established based on the multi physical field coupling method of electromagnetic heat flux. First of all, based on the electromagnetism theory of field-circuit coupling, current of each layer of the reactor was calculated by finite element method and the winding loss of each layer is calculated. Then, based on the heat transfer theory of fluid-temperature coupling, taking the winding loss of each layer as the heat source, the finite volume method is used to solve the reactor temperature distribution. Finally, the accuracy of the results is verified by the steady-state thermal analysis method. The results show that the temperature distribution of the reactor shows the trend that the upper region is larger than the lower one and the middle enclosure is larger than the two sides. The hot spot temperature rise of each layer is about 85%~90% of the reactor axial height. The research results provide a theoretical basis for the optimization of the reactor structure and the on-line monitoring of the temperature. This work is supported by National Natural Science Foundation of China (No. 51577050) and Key Science and Technology Projects of State Grid Jiangsu Electric Power Co., Ltd. in 2018 (No. J2018014).