The cooling of radiators in power transformers employing natural oil-air forced method is the purpose of this study. Two modes used for cooling fans, namely vertical and horizontal placement, will be compared as well. Four sets of radiators have been studied in this research, and in each set, 14 fins and three fans with a diameter of half a meter have been used. The fans will be arranged such that three of them will be placed under the radiator (in vertical position) in the first case, while in the second case, they will be located in one side of the radiator (in horizontal position). The results derived from the comparisons indicate the superiority of the horizontal mode in heat transfer against the vertical mode. Furthermore, it is notable that if the internal fan is disconnected, the cooling can be enhanced with the help of some existing points in the vertical mode. The improvement in heat transfer rate can be observed through locating the vertical fans optimally, once compared to the horizontal placement. The lower reliability of the vertical mode can be detected once the side fans are disconnected, while in any cases, the heat transfer superiority is achievable for horizontal mode. That is because, the disconnection of one of the fans, leads to the negligence of the radiators major parts in the vertical mode.

本研究的目的是采用自然油气驱动方法对电力变压器中的散热器进行冷却。还将比较用于冷却风扇的两种模式，即垂直和水平放置。在这项研究中，已经研究了四组散热器，每组中使用了14个散热片和三个直径为半米的风扇。在第一种情况下，风扇的布置应使其中的三个放置在散热器下方（垂直位置），而在第二种情况下，风扇将位于散热器的一侧（水平位置）。从比较得出的结果表明，水平模式在热传递方面优于垂直模式。此外，值得注意的是，如果内部风扇断开连接，在垂直模式下，可以借助一些现有的点来增强冷却效果。与水平放置相比，可以通过最佳地放置垂直风扇来观察传热率的提高。一旦断开侧风扇，就可以检测到垂直模式的可靠性较低，而在任何情况下，水平模式都可以实现传热优势。这是因为，其中一个风扇的断开导致在垂直模式下散热器主要部件的疏忽。对于水平模式，可以实现传热优势。这是因为，其中一个风扇的断开导致在垂直模式下散热器主要部件的疏忽。对于水平模式，可以实现传热优势。这是因为，其中一个风扇的断开导致在垂直模式下散热器主要部件的疏忽。