Power electric devices, such as line inductors or transformers, are limited by current, voltage, and operating temperature. Current is the main culprit behind the heating of all electric devices. Excess heating leads to faster degradation of the insulation and lowers the breakdown voltage. These factors determine the lifetime and reliability of these devices, which can be extended by lowering the operating temperature via cooling. This paper aims to present the numerical investigation of the coupled EM–CFD model of a line reactor (LR) with two cooling systems: air-based natural convection cooling system (AN), and air-natural with water-forced cooling system (ANWF). The design of the inductor cooling system was presented and described. The numerical investigation of both cooling systems is done considering power loss generation, cooling efficiency, and temperature distribution. In addition, the EM–CFD models of examined devices were validated by experiments considering thermal measurements using calibrated thermocouples, thermal image camera, pressure and flow rate measurements, where the temperature was measured in at least 35 points with probes. The tests were performed for three operating currents, resulting in 100%, 75%, and 50% of total power losses in the inductor. The numerical models reach an accuracy in temperature difference with respect to experiments within 5 K and 3.5 K for AN and ANWF cooling, respectively. The presented research shows that the ANWF system is superior and provides significant temperature reduction up to 68 K as well as the maximum temperature of the windings was reduced up to approx. 29.0K at 390 A RMS by use of ANWF. Furthermore, the hot-spot temperature in AN cooling system reached 135 °C, and up to 110 °C for the ANWF system, which can be further decreased down to 60.0 °C by lowering contact resistances.

电力电子设备，例如线路电感器或变压器，受到电流、电压和工作温度的限制。电流是所有电子设备发热的罪魁祸首。过度加热会导致绝缘更快退化并降低击穿电压。这些因素决定了这些设备的寿命和可靠性，可以通过冷却降低工作温度来延长寿命和可靠性。本文旨在介绍具有两个冷却系统的线路电抗器 (LR) 的耦合 EM-CFD 模型的数值研究：空气自然对流冷却系统 (AN) 和空气自然水强制冷却系统 (ANWF)。 ）。介绍并描述了感应器冷却系统的设计。对两种冷却系统进行了数值研究，考虑了产生的功率损耗、冷却效率、和温度分布。此外，研究设备的 EM-CFD 模型通过考虑使用校准热电偶、热像仪、压力和流速测量进行热测量的实验进行了验证，其中使用探头在至少 35 个点测量温度。测试针对三种工作电流进行，导致电感器总功率损耗的 100%、75% 和 50%。对于 AN 和 ANWF 冷却，数值模型分别在 5 K 和 3.5 K 内达到实验的温差精度。所提出的研究表明，ANWF 系统性能优越，可显着降低高达 68 K 的温度，并且绕组的最高温度降低了约 使用 ANWF 在 390 A RMS 下为 29.0K。此外， °C， ANWF 系统最高可达 110 °C，可 通过降低接触电阻进一步降低至 60.0 °C。