Research and design of digital integrator based on Rogowski coil

Integrator is the key element of electronic current transducer based on Rogowski coil.The temperature characteristics of analog integrator are analyzed.Both theoretic analysis and experimental data indicate the temperature is its most influencing factor.Digital integrator has better accuracy and higher stability than analog integrator.Trapezoidal formula is applied in digital integral algorithm and its responses to steady and transient currents are analyzed and simulated.Measures to deal with the drift and initialization of digital integrator are proposed.A digital integrator based on STM32F103 is designed and tested with the new-style PCB planar Rogowski coil current transducer.Its validity is proved by experimental data.