At present the Rogowski coil electronic current transformer adopts the hardware integrator

but affected by the disturbance of hardware components output errors and the system disturbance

hardware integrator has the distortion problem in specific situations. This paper presents a scheme of digital integrator with two correction links to adjust the DC component in the output of the integrator: the AD sampling output forward conditioning link and the integrator output feedback conditioning link. The AD sampling forward conditioning link is mainly used to remove the output DC offset of the electronic components and the integrator output feedback conditioning link to adjust the final output of the DC component

which contains the residual DC component from front end and DC component from data accuracy error after long-term accumulation. In order to prevent erroneous correction of DC component at the disturbance of the primary system

a detailed analysis is made of the signal conditioning limiting conditions. Through prototype development and experimental verification

it is proved that for normal current and various disturbances current

the digital integrator can accurately trace the original current

which is helpful to improving the measuring accuracy of the current.