As the key technology of the electronic current transformer based on Rogowski coil

the accuracy of current transformers is determined by the effect of the integrator. Traditional analog devices has error with theoretical value

leakage and loss of drift operational amplifier and capacitor

time drift and temperature drift and other problems will affect the final accuracy

so the study on analog devices is unable to fundamentally overcome these problems. At the same time

digital integrator is almost not affected by ambient temperature

humidity

noise

electromagnetic interference and so on. It has high reliability and repeat-ability

and it is being applied more and more widely. Based on the comparison of commonly used analog and digital integrator

this paper proposes an improved digital integrator with parallel channel

which can reduce the error and improve the speed of computation.