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.
可选用自冷式变压器，也可购买带有风扇或风扇加上油泵这种强迫冷却措施的变压器。
The transformer is available AS a self-cooled unit, or it can be purchASed with additional steps of forced cooling that use fan or fans and oil pumps.
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