In order to make the Rogowski coil electronic current transformer more suitable for the project

the anti-interference ability for integral part is necessary. We researched the characteristics of different digital integration algorithm

analyzed the effects of sampling frequency

harmonics

the interference of noise

frequency fluctuations and other factors on the electronic transformer used for measurement and protection

and thereby designed a high-precision digital integrator. The critical and experimental results show that the composite error and ratio error of the Gauss Algorithm are smaller and the Gauss Algorithm possesses a good ability to resist the above disturbance factors in the process of calculating sine wave signal

compared with the trapezoidal and Simpson integration algorithm. Meanwhile

the electronic current transformer use

d for protection can reduce the sampling points and play the role in improving its high-speed tripping to reduce the amount of calculation. Simulation results show that the design of digital integrator’s composite error is less than 0.13% under the 13 times harmonic based on the Gauss algorithm. The composite error is less than 8×10

-5

% when the frequency fluctuation range is ±0.5 Hz. The relative error is 0.077% if there is 10% white noise amplitude ratio.