Multichannel current sensor used for direct current arc detection

The invention discloses a multichannel current sensor used for direct current arc detection. The sensor comprises a plurality of detection channels, a simulation switch, a current transformer, an operational amplifier, a band-pass filter circuit and a signal processor. The current transformer collects a current signal in a detection channel. And a first operational amplifier, the band-pass filter circuit, an analog-to-digital converter and the signal processor process and determine whether an arc is generated. A first simulation switch is controlled by the signal processor so as to select to input a signal of the current transformer in one detection channel. A hall sensor is also included. The hall sensor measures a current, and a second operational amplifier, the analog-to-digital converter and the signal processor process and output the current. A second simulation switch and a third simulation switch are controlled by the signal processor. The second simulation switch selects to input a signal of the hall