不推荐使用低电压操作数的返回来作为差动元件的闭锁输入。差动元件包括饱和检测器,饱和检测器对差动电流和制动电流之间一定的时间关系做出反应,因此,为了合适地运行它必须时总是处于运行状态。这个元件可以用来给出–个需要的时间延时动作特性,
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