The temperature difference between copper and oil of natural oil circulation power transformer is bigger than that of forced oil circulation.
自然油循环变压器较以往强油循环变压器铜油温差加大，热问题就更加突出。
Since primary transformer of electric locomotive adopts the forced oil-circulation cooling method, its heating computation is rather complicated and difficult.
电力机车主变压器采用强迫油循环吹风冷却方式，其发热计算较为复杂和困难。
Since primary transformer of electric locomotive adopts the forced oil-circulation cooling method, its heating computation is rather complicated and difficult.
电力机车主变压器采用强迫油循环吹风冷却方式，其发热计算较为复杂和困难。
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