Amplifying device used for capacitor partial discharge on-line monitoring system

The utility model relates to an amplifying device used for a capacitor partial discharge on-line monitoring system. The capacitor partial discharge on-line monitoring system comprises a current sensor and a signal acquisition device. The amplifying device comprises a voltage follower unit, an amplifying unit and a cable driving unit. An input end of the voltage follower unit is connected to the current sensor; an input end of the amplifying unit is connected to the voltage follower unit, and an out put end is connected to the cable driving unit; and the cable driving unit is connected to the signal acquisition device. Compared with the prior art, the amplifying device used for the capacitor partial discharge on-line monitoring system of the utility model can eliminate influence of amplifier impedance on sensor impedance and influence of refraction and reflection on signal transmission.