Technology in designing integrator of electronic current transducer based on Rogowski coil

Integrator is a key element in an electronic current transducer based on Rogowski coil.This paper designs three types of integrators and compares their performances.The integrator designed by analog circuit could measure steady AC current accurately,and also it has a good performance in describing the transient process of fault current.So it can be used in the engineering field credibly for measuring and protecting system.Digital integrator designed by numerical formula needs the further research because of its deficiency in accuracy and numerical formula.Another digital integrator designed by chips could be applied in the measuring system,but it is limited in protecting system.