求翻译：容量比不超过3：1；是什么意思？

Capacity ratio less than 3:1;

capacity not exceeding 3:1 ratio;

The transformer copper loss refers to the loss which at the beginning of the secondary wire DC resistance creates, therefore only needs the transformer on to add on the nominal current then, the concrete operation is the secondary coil direct pipe nipple, adds the voltage on a side, amounts to until

Capacity than not more than 3:1;

Capacity than not more than 3:1;