用heavy 或者 large 都可以
heavy 常用些：
如：
1.Controlled under the heavy-current, it is easier to operate and adjust.
全部采用强电控制,操作简便,易于调整.
2.When a high-power electric motor is starting, the current is heavy and the traditional protection strategy can't distinguish if it is a short-circuit current or the normal starting current, so the system is tend to make wrong.
大功率电动机启动时电流较大,传统的保护策略无法区分是短路电流还是正常启动电流,易产生误动.