... 微分商（数学） differential quotient 差电流继电器 differential relay 差动螺旋，异节距螺旋 differential screw ...
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电磁式过电流继电器调整困难、度低、靠性差、能有效的对机电设备进行保护。
Electromagnetic overcurrent relays which are difficult to be adjusted and have low accuracy and reliability can not effectively protect electromechanical equipments.
由于零差保护的特殊性，零差继电器本身就是一只灵敏电流继电器或动作功率很小的电压继电器。
Due to the specialty, REF relay is a current relay with very high sensitivity or a voltage relay with very low acting power.
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