Integrator is a key element in an electronic current transformer based on Rogowski coil. Traditional analogintegrator is easily affected by the environment temperature change

electromagnetic interference and humiditychange and so on

the current integral algorithm accuracy is not high. Therefore

an improved integrator based on thetraditional integrator is designed. Sampling rate of the improved integrator is eight times higher than traditional inte-grator and a delay factor of 0.047 is also joined. The improved integrator can effectively improve the amplitude re-sponse error and phase angle response of the traditional Al-Alaoui integrator in the low frequency stage. FIR and IIRfiltering method can be used to simulate and analyze in this paper

the results indicate that the performances of theimproved integrator are better than the traditional integrator.